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Investigation on the Ammonia Sensitivity Mechanism of Conducting Polymer Polypyrroles Using <i>In-Situ</i>FT-IR
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作者 Ling Wang Renzhi Jiang 《Materials Sciences and Applications》 2019年第7期497-508,共12页
Ammonia is toxic, colorless, and harmful to human health. It is important to detect ammonia effectively by gas sensors. In this paper, the mechanism of ammonia sensing on polypyrroles (PPy) films at room temperature h... Ammonia is toxic, colorless, and harmful to human health. It is important to detect ammonia effectively by gas sensors. In this paper, the mechanism of ammonia sensing on polypyrroles (PPy) films at room temperature has been investigated using a real-time, in-situ Fourier-transform infrared (FT-IR) spectroscopy. The introduction of ammonia results in a structural transformation of PPy films, which is confirmed by FT-IR spectrums. The structure and morphology of the products after the reaction between ammonia and PPy were investigated in detail by FT-IR spectrum and scanning electron microscope (SEM). It was found that the morphology of PPy films was changed to some degree after the reaction. Our results demonstrate that FT-IR spectroscopy is an extremely suitable technique for the characterization of the specific reaction between PPy and ammonia, since it allows monitoring the reaction at room temperature in real time. After the reaction between PPy and ammonia, the concentration of the carrier increases, and the resistance of PPy films decreases, indicating the sensitivity of detection of ammonia. 展开更多
关键词 polypyrroles AMMONIA IN-SITU FT-IR Electrochemistry
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Hierarchical Reduced Graphene Oxide-MnO_(2)@Polypyrrole Coaxial Nanotube Composite Hydrogel as a Potential Adsorbent for Cr(Ⅵ)Removal
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作者 LIU Ben XU Yaowei +6 位作者 TONG Yuxing WANG Ziwei LIU Zhichang YAN Qunshan JI Jiayou GAO Song LI Shaoping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第5期1287-1293,共7页
A hierarchical reduced graphene oxide-MnO_(2)@polypyrrole coaxial nanotube composite hydrogel was prepared via oxidative polymerization of pyrrole in the presence of MnO_(2)nanotubes,followed by the hydrothermal treat... A hierarchical reduced graphene oxide-MnO_(2)@polypyrrole coaxial nanotube composite hydrogel was prepared via oxidative polymerization of pyrrole in the presence of MnO_(2)nanotubes,followed by the hydrothermal treatment of graphene oxide and MnO_(2)@polypyrrole coaxial nanotubes.The stable composite hydrogel with a hierarchical network was composed of one-dimensional MnO_(2)@polypyrrole coaxial nanotube and two-dimensional graphene nanosheet and characterized by scanning electron microscope,Fourier transform infrared spectroscopy,X-ray diffraction,Brunauer-Emmett-Teller surface,and X-ray photoelectron spectroscopy measurements.The composite hydrogel can be used as an efficient adsorbent for Cr(Ⅵ)removal due to the synergistic interaction between graphene and MnO_(2)@polypyrrole and the hierarchical structure of the hydrogel.Moreover,the composite hydrogel is easily separated because of its stable monolith,and it is reusable(76.8%of removal ability remaining after five adsorption-desorption cycles).The simple fabrication and cost-effective separation process together with the excellent absorption performance endow the composite hydrogel with great potential for practical wastewater treatment. 展开更多
关键词 HYDROGEL POLYPYRROLE MnO_(2) graphene Cr(Ⅵ)removal
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3D printing encouraging desired in-situ polypyrrole seed-polymerization for ultra-high energy density supercapacitors
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作者 Tiantian Zhou Shangwen Ling +6 位作者 Shuxian Sun Ruoxin Yuan Ziqin Wu Mengyuan Fu Hanna He Xiaolong Li Chuhong Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期117-125,I0004,共10页
The tireless pursuit of supercapacitors with high energy density entails the parallel advancement of wellsuited electrode materials and elaborately engineered architectures.Polypyrrole(PPy)emerges as an exceedingly co... The tireless pursuit of supercapacitors with high energy density entails the parallel advancement of wellsuited electrode materials and elaborately engineered architectures.Polypyrrole(PPy)emerges as an exceedingly conductive polymer and a prospective pseudocapacitive materials for supercapacitors,yet the inferior cyclic stability and unpredictable polymerization patterns severely impede its real-world applicability.Here,for the first time,an innovative seed-induced in-situ polymerization assisted 3D printing strategy is proposed to fabricate PPy-reduced graphene oxide/poly(vinylidene difluoride-cohexafluoropropylene)(PVDF-HFP)(PPy-rGO/PH)electrodes with controllable polymerization behavior and exceptional areal mass loading.The preferred active sites uniformly pre-planted on the 3D-printed graphene substrates serve as reliable seeds to induce efficient polypyrrole deposition,achieving an impressive mass loading of 185.6 mg cm^(-2)(particularly 79.2 mg cm^(-2)for polypyrrole)and a superior areal capacitance of 25.2 F cm^(-2)at 2 mA cm^(-2)for a 12-layer electrode.In agreement with theses appealing features,an unprecedented areal energy density of 1.47 mW h cm^(-2)for a symmetrical device is registered,a rarely achieved value for other PPy/rGO-based supercapacitors.This work highlights a promising route to preparing high energy density energy storage modules for real-world applications. 展开更多
关键词 3D printing Seed-induced polymerization SUPERCAPACITOR POLYPYRROLE High energy density
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Coupling Sb_(2)WO_(6)microflowers and conductive polypyrrole for efficient potassium storage by enhanced conductivity and K^(+) diffusivity
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作者 Ruiqi Tian Hehe Zhang +5 位作者 Zeyu Yuan Yuehua Man Jianlu Sun Jianchun Bao Ming-Sheng Wang Xiaosi Zhou 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第2期250-258,I0007,共10页
Although metal oxide compounds are considered as desirable anode materials for potassium-ion batteries(PIBs)due to their high theoretical capacity,the large volume variation remains a key issue in realizing metal oxid... Although metal oxide compounds are considered as desirable anode materials for potassium-ion batteries(PIBs)due to their high theoretical capacity,the large volume variation remains a key issue in realizing metal oxide anodes with long cycle life and excellent rate property.In this study,polypyrroleencapsulated Sb_(2)WO_(6)(denoted Sb_(2)WO_(6)@PPy)microflowers are synthesized by a one-step hydrothermal method followed by in-situ polymerization and coating by pyrrole.Leveraging the nanosheet-stacked Sb_(2)WO_(6)microflower structure,the improved electronic conductivity,and the architectural protection offered by the PPy coating,Sb_(2)WO_(6)@PPy exhibits boosted potassium storage properties,thereby demonstrating an outstanding rate property of 110.3 m A h g^(-1)at 5 A g^(-1)and delivering a long-period cycling stability with a reversible capacity of 197.2 m A h g^(-1)after 500 cycles at 1 A g^(-1).In addition,the conversion and alloying processes of Sb_(2)WO_(6)@PPy in PIBs with the generation of intermediates,K_(2)WO_(4)and K_(3)Sb,is determined by X-ray photoelectron spectroscopy,transmission electron microscopy,and exsitu X-ray diffraction during potassiation/depotassiation.Density functional theory calculations demonstrate that the robust coupling between PPy and Sb_(2)WO_(6)endues it with a much stronger total density of states and a built-in electric field,thereby increasing the electronic conductivity,and thus effectively reduces the K^(+)diffusion barrier. 展开更多
关键词 Sb_(2)WO_(6) Polypyrrole coating ANODE Potassium-ion battery In-situ TEM observation
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Novel Sustainable Cellulose Acetate Based Biosensor for Glucose Detection
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作者 M.F.Elkady E.M.El-Sayed +2 位作者 Mahmoud Samy Omneya A.Koriem H.Shokry Hassan 《Journal of Renewable Materials》 EI CAS 2024年第2期369-380,共12页
In this study,green zinc oxide(ZnO)/polypyrrole(Ppy)/cellulose acetate(CA)film has been synthesized via solvent casting.This film was used as supporting material for glucose oxidase(GOx)to sensitize a glucose biosenso... In this study,green zinc oxide(ZnO)/polypyrrole(Ppy)/cellulose acetate(CA)film has been synthesized via solvent casting.This film was used as supporting material for glucose oxidase(GOx)to sensitize a glucose biosensor.ZnO nanoparticles have been prepared via the green route using olive leaves extract as a reductant.ZnO/Ppy nanocomposite has been synthesized by a simple in-situ chemical oxidative polymerization of pyrrole(Py)monomer using ferric chloride(FeCl3)as an oxidizing agent.The produced materials and the composite films were characterized using X-ray diffraction analysis(XRD),scanning electron microscope(SEM),Fourier transform infrared(FTIR)and thermogravimetric analysis(TGA).Glucose oxidase was successfully immobilized on the surface of the prepared film and then ZnO/Ppy/CA/GOx composite was sputtered with platinum electrode for the current determination at different initial concentrations of glucose.Current measurements proved the suitability and the high sensitivity of the constructed biosensor for the detection of glucose levels in different samples.The performance of the prepared biosensor has been assessed by measuring and comparing glucose concentrations up to 800 ppm.The results affirmed the reliability of the developed biosensor towards real samples which suggests the wide-scale application of the proposed biosensor. 展开更多
关键词 Biosensors composite films GLUCOSE POLYPYRROLE green ZnO cellulose acetate
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Interconnected and high cycling stability polypyrrole supercapacitors using cellulose nanocrystals and commonly used inorganic salts as dopants 被引量:1
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作者 Zuxin Sun Wim Thielemans 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第1期165-174,I0005,共11页
Polypyrrole(PPy)is wildly used as electrode material in supercapacitors due to its high conductivity,low cost,ease of handling,and ease of fabrication.However,limited capacitance and poor cycling stability hinder its ... Polypyrrole(PPy)is wildly used as electrode material in supercapacitors due to its high conductivity,low cost,ease of handling,and ease of fabrication.However,limited capacitance and poor cycling stability hinder its practical application.After developing carboxylated cellulose nanocrystals(CNC-COO^(-))as immobile dopants for PPy to improve its cycling stability,we investigated the effect of different commonly used salts(KCl,NaCl,KBr,and NaClO_(4))as dopants during electrode fabrication by electropolymerization.The film’s capacitance increased from 160.6 to 183.4 F g^(-1)after adding a combination of KCl and NaClO_(4) into the electrodeposition electrolyte.More importantly,the porous and interconnected PPy/CNC-COO^(-)-Cl-(Cl O_(4)^(-))_0.5 electrode film exhibited an excellent capacitance of 125.0 F g^(-1)(0.78 F cm^(-2))at a high current density of 2.0 Ag^(-1)(20 m A cm^(-2),allowing charging in less than 1 min),increasing almost 204%over PPy/CNC-COO-films.A symmetric PPy/CNC-COO^(-)-Cl-(ClO_(4)^(-))_0.5 supercapacitor retained its full capacitance after 5000 cycles,and displayed a high energy density of 5.2 Wh kg^(-1)at a power density of 25.4 W kg^(-1)(34.5μWh cm^(-2) at 1752.3μW cm^(-2)).These results reveal that the porous structure formed by doping with CNC-COO-and inorganic salts opens up more active reaction areas to store charges in PPy-based films as the stiff and ribbon-like CNC-COO-as permanent dopants improve the strength and stability of PPy-based films.Our demonstration provides a simple and practical way to deposit PPy based supercapacitors with high capacitance,fast charging,and excellent cycling stability. 展开更多
关键词 POLYPYRROLE Cellulose nanocrystals Cycling stability Inorganic salts SUPERCAPACITOR
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Porous Graphene-Based Electrodes for Fiber-Shaped Supercapacitors with Good Electrical Conductivity 被引量:1
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作者 向睿芳 陈馨逸 +2 位作者 刘岩 张坤 陆春红 《Journal of Donghua University(English Edition)》 CAS 2023年第2期134-141,共8页
Graphene fibers(GFs)are ideal electrodes for f ibrous supercapacitors because of their excellent mechanical and electrical properties.However,the actual specific s urface area(SSA)of GFs is low due to the restacking o... Graphene fibers(GFs)are ideal electrodes for f ibrous supercapacitors because of their excellent mechanical and electrical properties.However,the actual specific s urface area(SSA)of GFs is low due to the restacking of g raphene sheets,which limits the capacitance enhancement o f GFs.One of the effective ways to increase the SSA of GFs is to construct a porous fiber structure,but it disrupts t he conductive pathway and adversely affects the electrochemical(EC)performance of GFs.Therefore,a wet-spun porous GF electrode coated with polypyrrole(PPy)was reported in this paper.The resulting electrode exhibits an areal specific capacitance of 31.25 mF·cm^(-2)and a good c ycling stability with a capacitance retention rate of 95%after 5000 charge/discharge cycles.These indicate that porous structures and PPy coating can synergistically improve the EC performance of GFs. 展开更多
关键词 graphene fiber(GF) WET-SPINNING polypyrrole(PPy) capacitance supercapacitor
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Polypyrrole-Coated Zein/Epoxy Ultrafine Fiber Mats for Electromagnetic Interference Shielding 被引量:1
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作者 丁润龙 戚瑞瑞 +3 位作者 刘飞 刘万双 张礼颖 蒋秋冉 《Journal of Donghua University(English Edition)》 CAS 2023年第4期351-356,共6页
To reduce the environmental pollution and meet the needs for wearable electronic devices, new requirements for electromagnetic interference(EMI) shielding materials include flexibility, biodegradability, and biocompat... To reduce the environmental pollution and meet the needs for wearable electronic devices, new requirements for electromagnetic interference(EMI) shielding materials include flexibility, biodegradability, and biocompatibility. Herein, we reported a polypyrrole-coated zein/epoxy(PPy/ZE) ultrafine fiber mat which was inherently biodegradable and skin-friendly. In addition, it could maintain its ultrafine fibrous structure after coating, which could provide the mat with mechanical compliance, high porosity, and a large specific area for high EMI shielding. With the assistance of the epoxide cross-linking, the breaking stresses of the PPy/ZE fiber mats could achieve 3.3 MPa and 1.4 MPa and the strains were 40.1% and 83.0% in dry and wet states, respectively, which met the needs of various wearable electronic devices. Along with the extension in the PPy treatment duration, more PPy was loaded on the fiber surfaces, which formed more integrated and conductive paths to generate increasing conductivities up to 401.76 S·m^(-1). Moreover, the EMI shielding performance was raised to 26.84 dB. The biobased mats provide a green and efficient choice for EMI shielding materials, which may be a promising strategy to address EMI problems in multiple fields. 展开更多
关键词 polypyrrole(PPy) ZEIN ultrafine fiber mat electromagnetic interference(EMI)shielding electrical conductivity
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Photocatalytic Degradation of Rhodamine B by Recyclable Ag Br/Polypyrrole(PPy)Nano-Catalysts
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作者 YIN Xiaogang LIU Xinyun +3 位作者 LI Hang WU Huimin FU Hai GONG Wei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第5期1198-1204,共7页
We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole(PPy)nano-photocatalysts.With PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide... We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole(PPy)nano-photocatalysts.With PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide(CTAB)as both the soft-templating agent and the bromine source,a series of AgBr/PPy nano-photocatalysts containing various proportions of silver were prepared in a convenient one-step synthesis procedure.The synthesized catalysts were characterized by TG analysis to reveal that,in comparison with pure PPy,the interaction between PPy and AgBr led to increased thermal stability.Chemical combination of PPy and AgBr was observed through XRD and XPS analyses.For the morphology study,the AgBr particles were found to be well dispersed in the PPy nanowire network from SEM results.In the photodegradation experiments,up to 92%rhodamine B was degraded by the AgBr/PPy catalysts in the period of 1 hour under 254 nm UV light.The catalysts could maintain 60%catalytic efficiency after 3 cycles in the recyclability test. 展开更多
关键词 POLYPYRROLE AGBR PHOTOCATALYSTS rhodamine B
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Co_3O_4 nanoparticles assembled on polypyrrole/graphene oxide for electrochemical reduction of oxygen in alkaline media 被引量:3
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作者 任素贞 郭亚男 +6 位作者 马少博 毛庆 吴丹丹 杨莹 景洪宇 宋雪旦 郝策 《Chinese Journal of Catalysis》 EI CSCD 北大核心 2017年第7期1281-1290,共10页
The development of highly efficient catalysts for cathodes remains an important objective of fuel cell research. Here, we report Co3O4 nanoparticles assembled on a polypyrrole/graphene oxide electrocatalyst (C... The development of highly efficient catalysts for cathodes remains an important objective of fuel cell research. Here, we report Co3O4 nanoparticles assembled on a polypyrrole/graphene oxide electrocatalyst (Co3O4/Ppy/GO) as an efficient catalyst for the oxygen reduction reaction (ORR) in alkaline media. The catalyst was prepared via the hydrothermal reaction of Co2+ ions with Ppy-modified GO. The GO, Ppy/GO, and Co3O4/Ppy/GO were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The incorporation of Ppy into GO nanosheets resulted in the formation of a nitrogen-modified GO po-rous structure, which acted as an efficient electron-transport network for the ORR. With further anchoring of Co3O4 on Ppy/GO, the as-prepared Co3O4/Ppy/GO exhibited excellent ORR activity and followed a four-electron route mechanism for the ORR in alkaline solution. An onset potential of -0.10 V vs. a saturated calomel electrode and a diffusion limiting current density of 2.30 mA/cm^2 were achieved for the Co3O4/Ppy/GO catalyst heated at 800 ℃; these values are comparable to those for noble-metal-based Pt/C catalysts. Our work demonstrates that Co3O4/Ppy/GO is highly active for the ORR. Notably, the Ppy coupling effects between Co3O4 and GO provide a new route for the preparation of efficient non-precious electrocatalysts with hierarchical porous structures for fuel cell applications. 展开更多
关键词 Non-precious metal electrocatalyst CO3O4 POLYPYRROLE Graphene Oxygen reduction reaction Proton-exchange membrane fuel cell
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Synthesis and Microwave Absorption Properties of BaTiO3-polypyrrole Composite
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作者 李巧玲 张存瑞 李建强 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第5期603-607,622,共6页
BaTiO3 powders are prepared by sol-gel method by cotton template. Polypyrrole is prepared by chemical oxidation route in the emulsion polymerization system. Then BaTiO3- polypyrrole composites with different mixture r... BaTiO3 powders are prepared by sol-gel method by cotton template. Polypyrrole is prepared by chemical oxidation route in the emulsion polymerization system. Then BaTiO3- polypyrrole composites with different mixture ratios are prepared by as-prepared material. The structure, morphology, and properties of the composites are characterized with Infrared spectrum, X-ray diffraction, scanning electron microscope, and net-wok analyzer. The com- plex permittivity and reflection loss of the composites are measured at different microwave frequencies in S-band and C-band (0.03-6 GHz) employing vector network analyzer model PNA 3629D vector. The effect of the mass ratio of BaTiO3 to polypyrrole on the microwave loss properties of the composites is investigated. A possible microwave absorbing mechanism of BaTiOa-polypyrrole composite is proposed. The BaTiO3-polypyrrole composite can find applications in suppression of electromagnetic interference and reduction of radar signature. 展开更多
关键词 BATIO3 POLYPYRROLE Microwave absorbing
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Preparation and Characterization of Polypyrrole Microbelt via Cotton Template
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作者 李巧玲 张存瑞 +1 位作者 薛征山 李建强 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第2期207-210,I0002,共5页
Polypyrrole (PPY) microbelts are synthesized via the absorbent cotton template for the first time. PPY microbelts are characterized by Fourier transform infrared spectroscopy.The stability, the morphology and electr... Polypyrrole (PPY) microbelts are synthesized via the absorbent cotton template for the first time. PPY microbelts are characterized by Fourier transform infrared spectroscopy.The stability, the morphology and electrical conductivity of such microbelts are evaluated by means of scanning electron microscope, thermo-gravimetric analysis and four-probe con-ductivity. A possible mechanism for the formation of PPY microbelts are proposed. The conductivity is measured, and the conductivity variation mechanism of the PPY microbelts with the pyrrole monomer concentrations is analyzed. 展开更多
关键词 Polypyrrole Microbelt Morphology Conductivity
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Study of lithium/polypyrrole secondary batteries with Lithium as cathode and polypyrrole anode 被引量:6
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作者 REN Li WANG Lixin AN Haoyuan ZHANG Fuqiang 《Rare Metals》 SCIE EI CAS CSCD 2007年第6期591-600,共10页
Lithium/polypyrrole (Li/PPy) batteries were fabricated using lithium sheet as cathode, PPy as anode, microporous membrane polypropylene/polyethylene/polypropylene (PP/PE/PP) composite as separator and LiPF6/ethyle... Lithium/polypyrrole (Li/PPy) batteries were fabricated using lithium sheet as cathode, PPy as anode, microporous membrane polypropylene/polyethylene/polypropylene (PP/PE/PP) composite as separator and LiPF6/ethylene carbonate-dimethyl carbonate-methyl ethyl carbonate (EC-DMC-EMC) as electrolyte. Polypyrrole was prepared by chemical polymerization. Certain fundamental electrochemical performances were investigated. Properties of the batteries were characterized and tested by SEM, galvanostatic charge/discharge tests, cyclic voltammetry (CV), and a.c. impedance spectroscopy. The influences of separator, morphology, and conductivity of PPy anode, cold-molded pressure, and electric current on the performances of the batteries were studied. Using PP/PE/PP membranes as separator, the battery showed good storage stability and cycling property. The conductivity of materials rather than morphology affected the behavior of the battery. The higher the conductivity, the better performances the cells had. Proper cold-molded pressure 20 MPa of the anode pellet would make the properties of the cells good and the fitted charge/discharge current was 0.1 mA. The cells showed excellent performance with 97%-100% coulombic efficiency. The highest discharge capacity of 95.2 mAh/g was obtained. 展开更多
关键词 polymer material lithium secondary batteries chemical oxidative polymerization POLYPYRROLE electrochemical performance
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Novel conductive polypyrrole/silk fibroin scaffold for neural tissue repair 被引量:7
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作者 Ya-Hong Zhao Chang-Mei Niu +3 位作者 Jia-Qi Shi Ying-Yu Wang Yu-Min Yang Hong-Bo Wang 《Neural Regeneration Research》 SCIE CAS CSCD 2018年第8期1455-1464,共10页
Three dimensional(3D) bioprinting, which involves depositing bioinks(mixed biomaterials) layer by layer to form computer-aided designs, is an ideal method for fabricating complex 3D biological structures. However,... Three dimensional(3D) bioprinting, which involves depositing bioinks(mixed biomaterials) layer by layer to form computer-aided designs, is an ideal method for fabricating complex 3D biological structures. However, it remains challenging to prepare biomaterials with micro-nanostructures that accurately mimic the nanostructural features of natural tissues. A novel nanotechnological tool, electrospinning, permits the processing and modification of proper nanoscale biomaterials to enhance neural cell adhesion, migration, proliferation, differentiation, and subsequent nerve regeneration. The composite scaffold was prepared by combining 3D bioprinting with subsequent electrochemical deposition of polypyrrole and electrospinning of silk fibroin to form a composite polypyrrole/silk fibroin scaffold. Fourier transform infrared spectroscopy was used to analyze scaffold composition. The surface morphology of the scaffold was observed by light microscopy and scanning electron microscopy. A digital multimeter was used to measure the resistivity of prepared scaffolds. Light microscopy was applied to observe the surface morphology of scaffolds immersed in water or Dulbecco's Modified Eagle's Medium at 37℃ for 30 days to assess stability. Results showed characteristic peaks of polypyrrole and silk fibroin in the synthesized conductive polypyrrole/silk fibroin scaffold, as well as the structure of the electrospun nanofiber layer on the surface. The electrical conductivity was 1 × 10^-5–1 × 10^-3 S/cm, while stability was 66.67%. A 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay was employed to measure scaffold cytotoxicity in vitro. Fluorescence microscopy was used to observe Ed U-labeled Schwann cells to quantify cell proliferation. Immunohistochemistry was utilized to detect S100β immunoreactivity, while scanning electron microscopy was applied to observe the morphology of adherent Schwann cells. Results demonstrated that the polypyrrole/silk fibroin scaffold was not cytotoxic and did not affect Schwann cell proliferation. Moreover, filopodia formed on the scaffold and Schwann cells were regularly arranged. Our findings verified that the composite polypyrrole/silk fibroin scaffold has good biocompatibility and may be a suitable material for neural tissue engineering. 展开更多
关键词 nerve regeneration composite nanofiber SCAFFOLD three dimensional bioprinting ELECTROSPINNING silk fibroin POLYPYRROLE L929 cells conductivity Schwann cells BIOCOMPATIBILITY nerve repair neural regeneration
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Improvement in the corrosion protection and bactericidal properties of AZ91D magnesium alloy coated with a microstructured polypyrrole film 被引量:7
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作者 A.D.Forero López I.L.Lehr +1 位作者 L.I.Brugnoni S.B.Saidman 《Journal of Magnesium and Alloys》 SCIE EI CAS 2018年第1期15-22,共8页
In this work hollow rectangular microtubes of polypyrrole(PPy)films were potentiostatically electrodeposited on magnesium alloy AZ91D in salicylate solution.The substrate was previously anodized under potentiostatic c... In this work hollow rectangular microtubes of polypyrrole(PPy)films were potentiostatically electrodeposited on magnesium alloy AZ91D in salicylate solution.The substrate was previously anodized under potentiostatic conditions in a molybdate solution in order to improve the adherence of polymer.Finally the duplex film was modified by the incorporation of silver species.The obtained coatings were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopies(XPS)and the antimicrobial activity against the bacteria Escherichia coli was evaluated.The corrosion protection properties of the coatings were examined in Ringer solution by monitoring the open circuit potential,polarization techniques and electrochemical spectroscopy(EIS).The duplex coating presents an improved anticorrosive performance with respect to the PPy film.The best results concerning corrosion protection and antibacterial activity were obtained for the silver-modified composite coating. 展开更多
关键词 POLYPYRROLE Duplex coating AZ91D alloy Corrosion resistance Antibacterial properties
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Fabrication of Fe_2O_3@polypyrrole Nanotubes and the Catalytic Properties Under the Ultrasound 被引量:5
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作者 陈春年 FU Wen ZHOU Qian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第5期990-996,共7页
Fe2O3@polypyrrole nanotubes (Fe2O3@PPy nanotubes) have been successfully prepared by in-situ polymerization of the pyrrole on the surface of Fe2O3 nanotubes (Fe2O3-NTs), via using L-Lysine as modified surfactant. ... Fe2O3@polypyrrole nanotubes (Fe2O3@PPy nanotubes) have been successfully prepared by in-situ polymerization of the pyrrole on the surface of Fe2O3 nanotubes (Fe2O3-NTs), via using L-Lysine as modified surfactant. Hollow PPy nanotubes were also produced by dissolution of the Fe2O3 core from the core/shell composite nanotubes with 1 mol,L-1 HC1. Scanning electron microscopy(SEM), transmission electron microscope (TEM), selective-area electron diffraction (SAED), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy(FT-IR) confirmed the formation of Fe2O3-NTs and Fe2O3@PPy core/shell nanotubes. Its catalytic properties were investigated under the ultrasound. The results of UV-vis spectroscopy (UV) demonstrated Rhodamine B (RhB) can be efficiently degraded by Fe2O3 @PPy nanotubes. 展开更多
关键词 Fe2O3 nanotubes composites POLYPYRROLE POLYMERISATION CATALYSIS rhodamine B
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High-Performance Solid-State Supercapacitors Fabricated by Pencil Drawing and Polypyrrole Depositing on Paper Substrate 被引量:4
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作者 Jiayou Tao Wenzhen Ma +4 位作者 Nishuang Liu Xiaoliang Ren Yuling Shi Jun Su Yihua Gao 《Nano-Micro Letters》 SCIE EI CAS 2015年第3期276-281,共6页
A solid-state powerful supercapacitor(SC) is fabricated with a substrate of Xerox paper. Its current collector based on a foldable electronic circuit is developed by simply pencil drawing. Thin graphite sheets on pape... A solid-state powerful supercapacitor(SC) is fabricated with a substrate of Xerox paper. Its current collector based on a foldable electronic circuit is developed by simply pencil drawing. Thin graphite sheets on paper provide effective channels for electron transmission with a low resistance of 95 X sq-1. The conductive organic material of polypyrrole coated on thin graphite sheets acts as the electrode material of the device. The as-fabricated SC exhibits a high specific capacitance of 52.9 F cm-3at a scan rate of 1 m V s-1. An energy storage unit fabricated by three full-charged series SCs can drive a commercial light-emitting diode robustly. This work demonstrated a simple, versatile and costeffective method for paper-based devices. 展开更多
关键词 SUPERCAPACITOR PAPER Pencil drawing POLYPYRROLE
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Graphite-polypyrrole coated 316L stainless steel as bipolar plates for proton exchange membrane fuel cells 被引量:4
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作者 Li-jun Yang Hai-jun Yu Li-jun Jiang Lei Zhu Xu-yu Jian Zhong Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第1期53-58,共6页
316L stainless steel(SS 316L) is quite attractive as bipolar plates in proton exchange membrane fuel cells(PEMFC).In this study,graphite-polypyrrole was coated on SS 316L by the method of cyclic voltammetry.The su... 316L stainless steel(SS 316L) is quite attractive as bipolar plates in proton exchange membrane fuel cells(PEMFC).In this study,graphite-polypyrrole was coated on SS 316L by the method of cyclic voltammetry.The surface morphology and chemical composition of the graphite-polypyrrole composite coating were investigated by scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).A simulated working environment of PEMFC was applied for testing the corrosion properties of graphite-polypyrrole coated SS 316L.The current densities in the simulated PEMFC anode and cathode conditions are around 3×10-9 and 9×10-5 A·cm-2,respectively.In addition,the interfacial contact resistance(ICR) was also investigated.The ICR value of graphite-polypyrrole coated SS 316L is much lower than that of bare SS 316L.Therefore,graphite-polypyrrole coated SS 316L indicates a great potential for the application in PEMFC. 展开更多
关键词 proton exchange membrane fuel cells POLYPYRROLE GRAPHITE CORROSION contact resistance stainless steel
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Freestanding polypyrrole nanotube/reduced graphene oxide hybrid film as flexible scaffold for dendrite-free lithium metal anodes 被引量:3
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作者 Gan Luo Xiaolin Hu +8 位作者 Wei Liu Guanjie Lu Qiannan Zhao Jie Wen Jian Liang Guangsheng Huang Bin Jiang Chaohe Xu Fusheng Pan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第7期285-291,共7页
Lithium metal anode is the most potential anode material for the next generation high-energy rechargeable batteries owing to its highest specific capacity and lowest redox potential.Unfortunately,the uneven deposition... Lithium metal anode is the most potential anode material for the next generation high-energy rechargeable batteries owing to its highest specific capacity and lowest redox potential.Unfortunately,the uneven deposition of Li during plating/stripping and the formation of uncontrolled Li dendrites,which might cause poor battery performance and serious safety problems,are demonstrating to be a huge challenge for its practical application.Here,we show that a flexible and free-standing film hybriding with polypyrrole(PPy) nanotubes and reduced graphene oxide(rGO) can significantly regulate the Li nucleation and deposition,and further prohibit the formation of Li dendrites,owing to the large specific surface area,rich of nitrogen functional groups and porous structures.Finally,the high Coulombic efficiency and stable Li plating/stripping cycling performance with 98% for 230 cycles at 0.5 mA cm^(-2) and more than 900 hours stable lifespan are achieved.No Li dendrites form even at a Li deposition capacity as high as4.0 mA h cm^(-2).Besides,the designed PPy/rGO hybrid anode scaffold can also drive a superior battery performance in the lithium-metal full cell applications. 展开更多
关键词 Lithium metal anode Polypyrrole nanotube Coulombic efficiency Lithium dendrites Uniform lithium deposition
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Preparation of polypyrrole/nanosilica composite for solid-phase microextraction of bisphenol and phthalates migrated from containers to eye drops and injection solutions 被引量:2
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作者 Mehdi Ansari Dogaheh Mansoureh Behzadi 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2019年第3期185-192,共8页
This paper describes the electrodeposition of polyphosphate-doped polypyrrole/nanosilica nano-composite coating on steel wire for direct solid-phase microextraction of bisphenol A and five phthalates. We optimized inf... This paper describes the electrodeposition of polyphosphate-doped polypyrrole/nanosilica nano-composite coating on steel wire for direct solid-phase microextraction of bisphenol A and five phthalates. We optimized influencing parameters on the extraction efficiency and morphology of the nanocomposite such as deposition potential, concentration of pyrrole and polyphosphate, deposition time and the nanosilica amount. Under the optimized conditions, characterization of the nanocomposite was inves-tigated by scanning electron microscopy and Fourier transform infra-red spectroscopy. Also, the factors related to the solid-phase microextraction method including desorption temperature and time, extrac-tion temperature and time, ionic strength and pH were studied in detail. Subsequently, the proposed method was validated by gas chromatography-mass spectrometry by thermal desorption and acceptable figures of merit were obtained. The linearity of the calibration curves was between 0.01 and 50 ng/mL with acceptable correlation coefficients (0.9956-0.9987) and limits of detection were in the range 0.002-0.01 ng/mL. Relative standard deviations in terms of intra-day and inter-day by five replicate analyses from aqueous solutions containing 0.1 ng/mL of target analytes were in the range 3.3%-5.4% and 5%-7.1%, respectively. Fiber-to-fiber reproducibilities were measured for three different fibers prepared in the same conditions and the results were between 7.3% and 9.8%. Also, extraction recoveries at two different concentrations were ≥96%. Finally, the suitability of the proposed method was demonstrated through its application to the analysis of some eye drops and injection solutions. 展开更多
关键词 SOLID-PHASE MICROEXTRACTION Gas chromatography-mass spectrometry Polyphosphate-doped POLYPYRROLE NANOSILICA PHTHALATES BisphenolA
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