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One-step electrodeposition to fabricate robust superhydrophobic silver/graphene coatings with excellent stability 被引量:2
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作者 De-xin CHEN Ye-qing HE +2 位作者 Qi-wei WANG Wei LI Zhi-xin KANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第10期3321-3333,共13页
A facile method was proposed to prepare stretchable silver-based composite coatings with excellent conductivity and stability for flexible electronics.Silver coating was firstly deposited on thermoplastic polyurethane... A facile method was proposed to prepare stretchable silver-based composite coatings with excellent conductivity and stability for flexible electronics.Silver coating was firstly deposited on thermoplastic polyurethane(TPU)elastomer rubber surface via two-component spraying technique,then the superhydrophobic surface was obtained by one-step electrodeposition of cerium compounds(CeM)and graphene nanosheets(GNS)to produce Ag/CeM/GNS composite coatings.The obtained Ag/CeM/GNS composite coatings maintained high conductivity after experiencing bending cycles and stretching cycles.Furthermore,the as-prepared Ag/CeM/GNS composite coatings showed excellent self-cleaning and anti-fouling properties,and the corrosion resistance has improved significantly compared to the original Ag coating.In addition,the Ag/CeM/GNS composite coatings could drive the circuit normally in the states of tensile,bending and twisting deformation,showing excellent mechanical stability and applicability.As a result,it is believed that the prepared Ag/CeM/GNS composite coatings with excellent conductivity and stability have promising applications for flexible electronics in harsh conditions. 展开更多
关键词 silver/graphene coating SUPERHYDROPHOBICITY one-step electrodeposition STABILITY
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Graphene coatings for corrosion resistance of nickel and copper in acidic,alkaline and neutral environments 被引量:1
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作者 R.K.Singh Raman Abhishek Kumar Arya +3 位作者 Kevin Tomy Faisal A Dip Evelyn Lai Saad Al-Saadi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第11期124-133,共10页
Graphene coatings have been reported to provide impressive corrosion resistance to nickel(Ni)and copper(Cu),because of remarkable characteristics of inertness and impermeablity of graphene.However,as the earlier inves... Graphene coatings have been reported to provide impressive corrosion resistance to nickel(Ni)and copper(Cu),because of remarkable characteristics of inertness and impermeablity of graphene.However,as the earlier investigations have generally been carried out in chloride environment,and it is important to understand the performance of graphene coating also in more aggressive environments such as acids and alkali.This study investigated the electrochemical corrosion behaviour of bare and graphene-coated(by chemical vapour deposition(CVD))Ni and Cu in 0.5 M H_(2)SO_(4),0.1 M NaCl and 0.5 M NaOH solutions.Electrochemical tests and post corrosion characterisation revealed the improvement in the corrosion resistance of Ni due to multilayer graphene coating to be similar in the three solutions,i.e.,the robustness of the barrier property of the multilayer graphene is largely unaffected by the aggressiveness of the corrosive environment.However,the improvement in corrosion resistance of bare Ni due to multilayer graphene is considerably greater(nearly 3 orders of magnitude)in the most aggressive of the test solutions(0.5 M H_(2)SO_(4)).The improvement is considerably less in 0.5 M NaOH because bare Ni develops a robust passive layer in highly alkaline solutions.The improvement in corrosion resistance of bare Cu is limited(within an order of magnitude)in the three solutions because Cu develops only 1-2 layers of graphene. 展开更多
关键词 CVD graphene coatings Electrochemical impedance spectroscopy(EIS) Potentiodynamic polarization(PDP) Raman spectroscopy
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Graphene-calcium carbonate coating to improve the degradation resistance and mechanical integrity of a biodegradable implant
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作者 Lokesh Choudhary Parama Chakraborty Banerjee +5 位作者 R.K.Singh Raman Derrek E.Lobo Christopher D.Easton Mainak Majumder Frank Witte Jörg F.Löffler 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第1期394-404,共11页
Biodegradable implants are critical for regenerative orthopaedic procedures,but they may suffer from too fast corrosion in human-body environment.This necessitates the synthesis of a suitable coating that may improve ... Biodegradable implants are critical for regenerative orthopaedic procedures,but they may suffer from too fast corrosion in human-body environment.This necessitates the synthesis of a suitable coating that may improve the corrosion resistance of these implants without compromising their mechanical integrity.In this study,an AZ91 magnesium alloy,as a representative for a biodegradable Mg implant material,was modified with a thin reduced graphene oxide(RGO)-calcium carbonate(CaCO_(3))composite coating.Detailed analytical and in-vitro electrochemical characterization reveals that this coating significantly improves the corrosion resistance and mechanical integrity,and thus has the potential to greatly extend the related application field. 展开更多
关键词 graphene coating Biodegradable implant HYDROXYAPATITE Corrosion Magnesium alloy
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Curing Kinetics, Mechanical Properties and Thermal Stability of Epoxy/Graphene Nanoplatelets(GNPs) Powder Coatings 被引量:4
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作者 智茂永 黄婉霞 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第5期1155-1161,共7页
Epoxy/graphene nanoplatelets(GNPs) powder coatings were fabricated using ultrasonic predispersion of GNPs and melt-blend extrusion method. The isothermal curing kinetics of epoxy/GNPs powder coating were monitored b... Epoxy/graphene nanoplatelets(GNPs) powder coatings were fabricated using ultrasonic predispersion of GNPs and melt-blend extrusion method. The isothermal curing kinetics of epoxy/GNPs powder coating were monitored by means of real-time Fourier transform infrared spectroscopy(FT-IR) with a heating cell. The mechanical properties of the epoxy/GNPs cured coatings had been investigated, by evaluating their fracture surfaces with field-emission scanning electron microscopy(FE-SEM) after three-point-bending tests. The thermal stability of the epoxy/GNPs cured coatings was studied by thermo-gravimetric analysis(TGA). The isothermal curing kinetics result showed that the GNPs would not affect the autocatalytic reaction mechanism, but the loading of GNPs below 1.0 wt % additive played a prompting role in the curing of the epoxy/GNPs powder coatings. The fracture strain, fracture toughness and impact resistance of the epoxy/GNPs cured coatings increased dramatically at low levels of GNPs loading(1 wt %), indicating that the GNPs could improve the toughness of the epoxy/GNPs powder coatings. Furthermore, from FE-SEM studies of the fracture surfaces, the possible toughening mechanisms of the epoxy/GNPs cured coatings were proposed. TGA result showed that the incorporation of GNPs improved the thermal stability of the cured coatings. Hence, the GNPs modified epoxy can be an efficient approach to toughen epoxy powder coating along with improving their thermal stability. 展开更多
关键词 epoxy powder coating graphene nanoplatelets(GNPs) toughening mechanism thermal stability
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The role of graphene coating on cordierite-supported Pd monolithic catalysts for low-temperature combustion of toluene 被引量:10
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作者 Wen Li Hongqi Ye +3 位作者 Gonggang Liu Hongchao Ji Yonghua Zhou Kai Han 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第5期946-954,共9页
In the present work,a Pd/graphene/cordierite(Pd/Gr/Cor)composite was prepared as a monolithic catalyst for low-temperature combustion of toluene.We mainly focused on understanding the role of graphene coating through ... In the present work,a Pd/graphene/cordierite(Pd/Gr/Cor)composite was prepared as a monolithic catalyst for low-temperature combustion of toluene.We mainly focused on understanding the role of graphene coating through investigation of catalytic performance and adsorption behavior of the composite.Compared with the traditional Pd/Cor catalyst without graphene coating,Pd/Gr/Cor catalyst delivered much higher activity and stability for toluene catalytic combustion in both dry and moist conditions.Transmission electron microscopy(TEM)and hydrophobic characterizations indicated that graphene coating can considerably improve the dispersity of Pd nanoparticles and enhance the hydrophobicity of the cordierite support.The adsorption behavior of the above two catalysts,including adsorption isothermal,adsorption kinetics,and adsorption thermodynamics were carefully investigated.The simulation results indicated that a large amount of toluene was adsorbed on graphene surface through relatively weak interaction,whereas only a relatively small amount of toluene was adsorbed on Pd surface with strong affinity.The adsorption thermal calculation indicated that the adsorption of toluene on graphene was a process with reduced entropy,indicating highly-ordered assembly of toluene molecular on graphene.It is the significant concentration and affinity gap between graphene and Pd that ensures a simultaneously and rapid transfer of toluene during the reaction process. 展开更多
关键词 graphene coating PALLADIUM Catalytic combustion STEAM Adsorption
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Core@shell sulfur@polypyrrole nanoparticles sandwiched in graphene sheets as cathode for lithium–sulfur batteries 被引量:3
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作者 Xiangyang Zhou Feng Chen Juan Yang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第4期448-455,共8页
A nano sulfur-based composite cathode material featured by uniform core@shell-structured sulfur@polypyrrole nanoparticles sandwiched in three-dimensional graphene sheets conductive network(S@PPy/GS) is fabricated vi... A nano sulfur-based composite cathode material featured by uniform core@shell-structured sulfur@polypyrrole nanoparticles sandwiched in three-dimensional graphene sheets conductive network(S@PPy/GS) is fabricated via a facile solution-based method. The S@PPy nanoparticles are synthesized by in situ chemical oxidative polymerization of pyrrole on the surface of sulfur particles,and then graphene sheets are covered outside the S@PPy nanoparticles,forming a three-dimensional conductive network. When evaluating the electrochemical performance of S@PPy/GS in a lithium–sulfur battery,it delivers large discharge capacity,excellent cycle stability,and good rate capability. The initial discharge capacity is up to 1040 m Ah/g at 0.1 C,the capacity can remain 537.8 m Ah/g at 0.2 C after 200 cycles,even at a higher rate of 1 C,the specific capacity still reaches 566.5 m Ah/g. The good electrochemical performance is attributed to the unique structure of S@PPy/GS,which can not only provide an excellent transport of lithium and electron ions within the electrodes,but also retard the shuttle effect of soluble lithium polysulfides effectively,thus plays a positive role in building better lithium-sulfur batteries. 展开更多
关键词 Nano sulfur Conductive polymer Core@shell structure graphene coating Lithium–sulfur battery
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Graphene quantum dots assisted photovoltage and efficiency enhancement in CdSe quantum dot sensitized solar cells 被引量:1
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作者 Yuanyuan Zhong Hua Zhang +2 位作者 Dengyu Pan Liang Wang Xinhua Zhong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第6期722-728,共7页
CdSe quantum dot sensitized solar cells (QDSCs) modified with graphene quantum dots (GQDs) have been successfully achieved in this work for the first time. Satisfactorily, the optimized photovoltage (Voc) of the... CdSe quantum dot sensitized solar cells (QDSCs) modified with graphene quantum dots (GQDs) have been successfully achieved in this work for the first time. Satisfactorily, the optimized photovoltage (Voc) of the modified QDSCs was approximately 0.04 V higher than that of plain CdSe QDSCs, consequently improving the photovoltaic performance of the resulting QDSCs. Served as a novel coating on the CdSe QD sensitized photoanode, GQDs played a vital role in improving Voc due to the suppressed charge recombination which has been confirmed by electron impedance spectroscopy as well as transient photovoltage decay measure- ments. Moreover, different adsorption sequences, concentration and deposition time of GQDs have also been systematically investigated to boost the power conversion efficiency (PCE) of CdSe QDSCs. After the coating of CdSe with GQDs, the resulting champion CdSe QDSCs exhibited an improved PCE of 6.59% under AM 1.5G full one sun illumination. 展开更多
关键词 graphene quantum dot CdSe O DSCs Coating Open-circuit voltage Power conversion efficiency
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Corrosion Resistance of Graphene-Reinforced Waterborne Epoxy Coatings 被引量:69
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作者 Shuan Liu Lin Gu +2 位作者 Haichao Zhao Jianmin Chen Haibin Yu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第5期425-431,共7页
Graphene (G) was dispersed uniformly in water and used as an inhibitor in waterborne epoxy coatings. The effect of dispersed G on anticorrosion performance of epoxy coatings was evaluated. The composite coatings dis... Graphene (G) was dispersed uniformly in water and used as an inhibitor in waterborne epoxy coatings. The effect of dispersed G on anticorrosion performance of epoxy coatings was evaluated. The composite coatings displayed outstanding barrier properties against H20 molecule compared to the neat epoxy coating. Open circuit potential (OCP), Tafel and electrochemical impedance spectroscopy (EIS) analysis confirmed that the corrosion rate exhibited by composite coatings with 0.5 wt% G was an order of magnitude lower than that of neat epoxy coating. Salt spray test results revealed superior corrosion resistance offered by the composite coating. 展开更多
关键词 Waterborne epoxy coating graphene Corrosion resistance Electrochemical impedance spectroscopy(EIS)
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Insight into the effect of graphene coating on cycling stability of LiNi_(0.5)Mn_(1.5)O_(4):Integration of structure-stability and surface-stability 被引量:1
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作者 Chao Gao Haiping Liu +4 位作者 Sifu Bi Shanshan Fan Xiaohuan Meng Qiuying Li Chongxiao Luo 《Journal of Materiomics》 SCIE EI 2020年第4期712-722,共11页
Graphene has presented promising features for application in lithium ion batteries(LIBs)due to its superior electronic conductivity and high surface area.It has been successfully used for modifying cathode materials t... Graphene has presented promising features for application in lithium ion batteries(LIBs)due to its superior electronic conductivity and high surface area.It has been successfully used for modifying cathode materials to meet the increasing demand for LIBs with longer cycle life.However,the improving effect of graphene on cycling stability is still unclear,which restricts its further application in LIBs.Herein,graphene coated hollow sphere-like structure LiNi0.5Mn1.5O4(LNMO)wasdesigned and the improvement mechanism of graphene coating on LNMO’s cycling stability was investigated.The results show that graphene coating not only contributes to suppress structural deformation from mechanistic reaction and extend solid-solution reaction,but also helps protect electrode from corrosion by the products from electrolyte decomposition and suppress the generation of surface defects,especially at high temperature.Owing to graphene coating,graphene coated LNMO can deliver a discharge capacity of 91 mAh g1 with high capacity retention of 82.5%after 1000 cycles under 20C and 83.8 mAh g1 with 94.5%capacity retention after 100 cycles under 2C at 55C.This work deeply explores the effect of graphene coating on cycling stability from crystal stability and surface stability,which will help a wider application of graphene in energy storage field. 展开更多
关键词 graphene coating LiNi_(0.5)Mn_(1.5)O_(4) Cycle stability Structure stability Surface stability
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Lithiation-enhanced charge transfer and sliding strength at the silicon-graphene interface:A first-principles study 被引量:1
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作者 Cheng Chang Xiaoyan Li +1 位作者 Zhiping Xu Huajian Gao 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2017年第3期254-262,共9页
The application of silicon as ultrahigh capacity electrodes in lithiumion batteries has been limited by a number of mechanical degradation mechanisms including fracture, delamination and plastic ratcheting, as a resul... The application of silicon as ultrahigh capacity electrodes in lithiumion batteries has been limited by a number of mechanical degradation mechanisms including fracture, delamination and plastic ratcheting, as a result of its large volumetric change during lithiation and delithiation. Graphene coating is one feasible technique to mitigate the mechanical degradation of Si anode and improve its conductivity. In this paper, first-principles calculations are performed to study the atomic structure, charge transfer and sliding strength of the interface between lithiated silicon and graphene. Our results show that Li atoms segre- gate at the (lithiated) Si-graphene interface preferentially, donating electrons to graphene and enhancing the interfacial sliding resistance. Moreover, the interfacial cohesion and sliding strength can be further enhanced by introducing single-vacancy defects into graphene. These findings provide insights that can guide the design of stable and efficient anodes of silicon/graphene hybrids for energy storage applications. 展开更多
关键词 Lithium-ion batteries Silicon anode graphene coating Interracial sliding strength First-principles calculations
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Calotropis gigantea Fiber‑Based Sensitivity‑Tunable Strain Sensors with Insensitive Response to Wearable Microclimate Changes 被引量:4
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作者 Junze Zhang Jing Liu +8 位作者 Zeyu Zhao Weiwei Sun Gaojuan Zhao Jingge Liu Jianchu Xu Yuling Li Zekun Liu Yi Li Gang Li 《Advanced Fiber Materials》 SCIE EI CAS 2023年第4期1378-1391,共14页
Wearable tensile strain sensors have attracted substantial research interest due to their great potential in applications for the real-time detection of human motion and health through the construction of body-sensing... Wearable tensile strain sensors have attracted substantial research interest due to their great potential in applications for the real-time detection of human motion and health through the construction of body-sensing networks.Conventional devices,however,are constantly demonstrated in non-real world scenarios,where changes in body temperature and humidity are ignored,which results in questionable sensing accuracy and reliability in practical applications.In this work,a fabric-like strain sensor is developed by fabricating graphene-modified Calotropis gigantea yarn and elastic yarn(i.e.Spandex)into an independently crossed structure,enabling the sensor with tunable sensitivity by directly altering the sensor width.The sensor possesses excellent breathability,allowing water vapor generated by body skin to be discharged into the environment(the water evaporation rate is approximately 2.03 kg m^(-2) h^(-1))and creating a pleasing microenvironment between the sensor and the skin by avoiding the hindering of perspiration release.More importantly,the sensor is shown to have a sensing stability towards changes in temperature and humidity,implementing sensing reliability against complex and changeable wearable microclimate.By wearing the sensor at various locations of the human body,a full-range body area sensing network for monitoring various body movements and vital signs,such as speaking,coughing,breathing and walking,is successfully dem-onstrated.It provides a new route for achieving wearing-comfortable,high-performance and sensing-reliable strain sensors. 展开更多
关键词 Wearable strain sensor Functionalized Calotropis gigantea fiber Wearable microclimate graphene coating Tunable sensitivity
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