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Nickel Oxide/Carbon Nanotubes Nanocomposite for Electrochemical Capacitance 被引量:11
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作者 KuiLIANG KayhyeokAN YoungheeLEE 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第3期292-296,共5页
A nanocomposite of nickel oxide/carbon nanotubes was prepared through a simple chemical precipitation followed by thermal annealing. The electrochemical capacitance of this electrode material was studied. When the mas... A nanocomposite of nickel oxide/carbon nanotubes was prepared through a simple chemical precipitation followed by thermal annealing. The electrochemical capacitance of this electrode material was studied. When the mass fraction of CNTs (carbon nanotubes) in NiO/CNT composites increases, the electrical resistivity of nanocomposites decreases and becomes similar to that of pure CNTs when it reaches 30%. The specific surface area of composites increases with increasing CNT mass fraction and the specific capacitance reaches 160 F/g under 10 mA/g discharge current density at CNT mass fraction of 10%. 展开更多
关键词 Nickel oxide carbon nanotubes NANOCOMPOSITE electrochemical capacitance
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Influence of KOH activation techniques on pore structure and electrochemical property of carbon electrode materials 被引量:6
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作者 李晶 李劼 +3 位作者 赖延清 宋海申 张治安 刘业翔 《Journal of Central South University of Technology》 EI 2006年第4期360-366,共7页
Taking the selection of coal-tar pitch as precursor and KOH as activated agent, the activated carbon electrode material was fabricated for supercapacitor.The surface area and the pore structure of activated carbon wer... Taking the selection of coal-tar pitch as precursor and KOH as activated agent, the activated carbon electrode material was fabricated for supercapacitor.The surface area and the pore structure of activated carbon were analyzed by Nitro adsorption method. The electrochemical properties of the activated carbons were determined using two-electrode capacitors in 6 mol/L KOH aqueous electrolytes. The influences of activated temperature and mass ratio of KOH to C on the pore structure and electrochemical property of porous activated carbon were investigated in detail. The reasons for the changes of pore structure and electrochemical performance of activated carbon prepared under different conditions were also discussed theoretically. The results indicate that the maximum specific capacitance of 240 F/g can be obtained in alkaline medium, and the surface area, the pore structure and the specific capacitance of activated carbon depend on the treatment methods; the capacitance variation of activated carbon cannot be interpreted only by the change of surface area and pore structure, the lattice order and the electrolyte wetting effect of the activated carbon should also be taken into account. 展开更多
关键词 SUPERCAPACITOR activated carbon chemical activation pore structure specific capacitance
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High areal capacitance of Fe3O4-decorated carbon nanotubes for supercapacitor electrodes 被引量:5
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作者 Mohamed Nawwar Ryan Poon +3 位作者 Ri Chen Rakesh PSahu Ishwar KPuri Igor Zhitomirsky 《Carbon Energy》 CAS 2019年第1期124-133,共10页
A conceptually new approach has been developed for the fabrication of magnetite(Fe3O4)-decorated carbon nanotubes(M-CNTs)for negative electrodes of electrochemical supercapacitors.M-CNTs were prepared by an ultrasonic... A conceptually new approach has been developed for the fabrication of magnetite(Fe3O4)-decorated carbon nanotubes(M-CNTs)for negative electrodes of electrochemical supercapacitors.M-CNTs were prepared by an ultrasonic-assisted chemical synthesis method,which involved dispersion of functionalized CNTs in water,Fe3O4 formation on the CNTs surface,and particle extraction through liquid-liquid interface(PELLI).Palmitic acid was found to be an efficient new extractor for PELLI.The slurries produced after drying and redispersing M-CNTs and slurries obtained using PELLI were used for electrode fabrication.The electrodes prepared using PELLI showed superior performance due to reduced particle agglomeration.Testing results provided an insight into the influence of Fe3O4/CNTs mass ratio on the capacitance and capacitance retention at high charge-discharge rates.A capacitance of 5.82 F cm−2(145.4 F g−1)was achieved in Na2SO4 electrolyte using electrodes with high active mass of 40 mg cm−2 and ratio of active mass to current collector mass of 0.6.Good electrochemical performance was achieved at low impedance.The capacitance of the negative M-CNTs electrodes was comparable with capacitance of advanced positive MnO2-CNTs electrodes,which was beneficial for the fabrication of asymmetric devices.The asymmetric device has been fabricated,which showed promising performance in a voltage window of 1.6 V. 展开更多
关键词 asymmetric device capacitance carbon nanotube composite MAGNETITE SUPERCAPACITOR
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Review of Electrochemical Capacitors Based on Carbon Nanotubes and Graphene 被引量:5
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作者 Jian Li Xiaoqian Cheng +1 位作者 Alexey Shashurin Michael Keidar 《Graphene》 2012年第1期1-13,共13页
Electrochemical capacitors, which can store large amount of electrical energy with the capacitance of thousands of Farads, have recently been attracting enormous interest and attention. Carbon nanostructures such as c... Electrochemical capacitors, which can store large amount of electrical energy with the capacitance of thousands of Farads, have recently been attracting enormous interest and attention. Carbon nanostructures such as carbon nanotubes and graphene are considered as the potentially revolutionary energy storage materials due to their excellent properties. This paper is focused on the application of carbon nanostructures in electrochemical capacitors, giving an overview regarding the basic mechanism, design, fabrication and achievement of latest research progresses for electrochemical capacitors based on carbon nanotubes, graphene and their composites. Their current challenges and future prospects are also discussed. 展开更多
关键词 electrochemical Capacitors ULTRACAPACITORS supercapacitors carbon nanotubes GRAPHENE
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Preparation of activated carbons from mesophase pitch and their electrochemical properties 被引量:4
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作者 赖延清 李晶 +3 位作者 宋海申 张治安 李劼 刘业翔 《Journal of Central South University of Technology》 EI 2007年第5期633-637,共5页
The influences of molar ratio of KOH to C and activated temperature on the pore structure and electrochemical property of porous activated carbon from mesophase pitch activated by KOH were investigated. The surface ar... The influences of molar ratio of KOH to C and activated temperature on the pore structure and electrochemical property of porous activated carbon from mesophase pitch activated by KOH were investigated. The surface areas and the pore structures of activated carbons were analyzed by nitrogen adsorption, and the electrochemical properties of the activated carbons were studied using two-electrode capacitors in organic electrolyte. The results indicate that the maximum surface area of 3 190 m2/g is obtained at molar ratio of KOH to C of 5:1, the maximum specific capacitance of 122 F/g is attained at molar ratio of KOH to C of 4:1, and 800 ℃ is the proper temperature to obtain the maximum surface area and capacitance. 展开更多
关键词 SUPERCAPACITOR activated carbon mesophase pitch chemical activation pore structure electrochemical properties
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An integrated strategy towards the facile synthesis of core-shell SiC-derived carbon@N-doped carbon for high-performance supercapacitors 被引量:3
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作者 Zhongya Pang Guangshi Li +7 位作者 Xingli Zou Chenteng Sun Conghui Hu Wei Tang Li Ji Hsien-Yi Hsu Qian Xu Xionggang Lu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第5期512-521,共10页
Porous active core-shell carbon material with excellent synergistic effect has been regarded as a prospective material for supercapacitors.Herein,we report an integrated method for the facile synthesis of carbide-deri... Porous active core-shell carbon material with excellent synergistic effect has been regarded as a prospective material for supercapacitors.Herein,we report an integrated method for the facile synthesis of carbide-derived carbon(CDC)encapsulated with porous N-doped carbon(CDC@NC)towards highperformance supercapacitors.Polydopamine(PDA)as nitrogen and carbon sources was simply coated on SiC nanospheres to form SiC@PDA,which was then directly transformed into CDC@NC via a onestep molten salt electro-etching/in-situ doping process.The synthesized CDC@NC with hierarchically porous structure has a high specific surface area of 1191 m^(2) g^(-1).The CDC core and NC shell are typical amorphous carbon and more ordered N-doped carbon,respectively.Benefitting from its unique dual porous structures,the CDC@NC demonstrates high specific capacitances of 255 and 193 F g^(-1) at 0.5 and20 A g^(-1),respectively.The reaction mechanism of the electro-etching/in-situ doping process has also been investigated through experimental characterizations and theoretical density functional theory calculations.It is suggested that the molten salt electro-etching/in-situ doping strategy is promising for the synthesis of active core-shell porous carbon materials with synergistic properties for supercapacitors without the need for additional doping/activation processes. 展开更多
关键词 Molten salt electrochemical etching Core-shell structure Porous carbon In-situ nitrogen doping supercapacitors
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AuNP@Co_(3)(HITP)_(2)-CNT纳米结构的制备及电化学传感性能
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作者 岳王香 戴灿源 +5 位作者 李京谦 胡珂祺 李轶凡 王文达 徐宏妍 胡杰 《微纳电子技术》 CAS 2024年第6期54-61,共8页
利用一步水热法和化学还原法制备了基于金纳米颗粒负载Co_(3)(HITP)_(2)-碳纳米管(AuNP@Co_(3)(HITP)_(2)-CNT)的纳米复合材料。利用X射线光电子能谱仪(XPS)和扫描电子显微镜(SEM)对其表面微观形貌和元素组成进行表征。构建了前列腺特... 利用一步水热法和化学还原法制备了基于金纳米颗粒负载Co_(3)(HITP)_(2)-碳纳米管(AuNP@Co_(3)(HITP)_(2)-CNT)的纳米复合材料。利用X射线光电子能谱仪(XPS)和扫描电子显微镜(SEM)对其表面微观形貌和元素组成进行表征。构建了前列腺特异性抗原(PSA)/牛血清蛋白(BSA)/PSA抗体(Ab)/AuNP@Co_(3)(HITP)_(2)-CNT/玻碳电极(GCE)电化学免疫传感器,并对PSA进行了检测,用循环伏安法(CV)、差分脉冲伏安法(DPV)和电化学阻抗谱(EIS)对其进行电化学性能分析测试。实验结果表明:基于AuNP@Co_(3)(HITP)_(2)-CNT纳米复合材料的电化学免疫传感器对PSA有较宽的检测范围,可达40 fg/mL~100 ng/mL,同时具有较好的特异性、稳定性和可重复性。 展开更多
关键词 电化学免疫传感器 导电金属有机框架(C-MOF) 纳米结构 碳纳米管(CNT) 金纳米颗粒(AuNP) 前列腺特异性抗原(PSA)
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复合碳气凝胶的制备及其电化学性能
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作者 于天皎 史非 +2 位作者 刘敬肖 李文思 郑中祥 《大连工业大学学报》 CAS 2024年第4期296-299,共4页
以间苯二酚、甲醛和生物质柚棉为原料,采用冷冻干燥及惰性气氛碳化处理相结合的方式,制备了复合碳气凝胶材料;分析了先驱液自生长时间对复合碳气凝胶比表面积、孔结构及微观结构的影响;采用恒电流充放电法、循环伏安法和交流阻抗法对其... 以间苯二酚、甲醛和生物质柚棉为原料,采用冷冻干燥及惰性气氛碳化处理相结合的方式,制备了复合碳气凝胶材料;分析了先驱液自生长时间对复合碳气凝胶比表面积、孔结构及微观结构的影响;采用恒电流充放电法、循环伏安法和交流阻抗法对其电化学性能进行了表征。结果表明,所制备的复合碳气凝胶的比表面积为323~410 m^(2)/g,孔容积为0.752~0.800 cm^(3)/g,呈现出明显的介孔结构;自生长时间为6 h时所制备的CA@PC-6复合碳气凝胶具有较高的比表面积和优良的电化学性能,比表面积为410 m^(2)/g,孔径为11.70 nm,电阻为0.704Ω,在电流密度0.5 A/g时比电容达到219.97 F/g。 展开更多
关键词 碳气凝胶 超极电容器 比电容 电化学性能
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Hierarchically Structured Three-Dimensional Carbon-Based Integrated Electrodes with Enhanced Pseudocapacitance and Deformability
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作者 Bo-Hao Xiao Wei-Jie Cai +2 位作者 Pei-Yuan Wu Kang Xiao Zhao-Qing Liu 《Renewables》 2023年第2期227-238,共12页
Compressible supercapacitors play an increasingly significant role in flexible sensors and wearable electronic devices.However,the integration of mechanical compressibility and excellent electrochemical performance in... Compressible supercapacitors play an increasingly significant role in flexible sensors and wearable electronic devices.However,the integration of mechanical compressibility and excellent electrochemical performance into a single device remains a challenge.Herein,we demonstrate a compressible and high-performance supercapacitor based on an N-doped carbon foam elastomer with hierarchical carbon nanotubes.Hierarchically structured Fe3C@N-doped carbon nanotubes/N-doped carbon foam and Ni@N-doped carbon nanotubes/N-doped carbon foam have been synthesized via a simple and universal self-catalytic strategy.The hierarchical structural features of self-catalytic N-doped carbon nanotubes serve as a cushion when the composite is subjected to an external force,exhibiting excellent mechanical properties with a maximum compressive strain of 80%and fatigue resistance of 1000 cycles.Moreover,the different electroactive potentials of the transition-metal species in the composites provide the assembly with a maximum operating voltage of 1.4 V,which shows a maximum energy density of∼10.74 Wh kg^(−1)(0.084 mWh cm^(−3))at the power density of∼179.2 W kg^(−1)(1.4 mWh cm^(−3)),and retains 88.4%of the original capacitance after 20,000 charge–discharge cycles,even at a strain of 80%.This work paves the way for controllable fabrication of compressible electrodes and supercapacitors. 展开更多
关键词 compressible supercapacitors hierarchical structure self-catalytic N-doped carbon nanotubes N-doped carbon foam PSEUDOcapacitance
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Electric-field-induced microstructure modulation of carbon nanotubes for high-performance supercapacitors 被引量:1
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作者 Chengzhi LUO Guanghui LIU Min ZHANG 《Frontiers of Materials Science》 SCIE CSCD 2019年第3期270-276,共7页
The growth direction,morphology and microstructure of carbon nano-tubes(CNTs)play key roles for their potential applications in electronic and energy storage devices.However,effective synthesis of CNTs in high crystal... The growth direction,morphology and microstructure of carbon nano-tubes(CNTs)play key roles for their potential applications in electronic and energy storage devices.However,effective synthesis of CNTs in high crystallinity and desired microstructure still remains a tremendous challenge.Here we introduce an electric field for controlling the microstructure formation of CNTs.It reveals that the electric field not only make CNTs aligned parallel but also improve the density of CNTs.Especially,the microstructures of CNTs gradually change under electrical field.That is,graphite sheets are transformed from the"herringbone"structure to a highly crystalline structure,facilitating the transportation of electrons.Due to the improved aligned growth direction,high density and highly crystalline microstructure,the electrochemical performance of CNTs is greatly improved.When the CNTs are applied in supercapacitors,they present a high specific capacitance of 237 F/g,three times higher than that of the CNTs prepared without electrical field.Such microstructure modulation of CNTs by electric field would help to construct high performance electronic and energy storage devices. 展开更多
关键词 carbon NANOTUBE electric field MICROstructure control SUPERCAPACITOR electrochemical performance
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Nickel Sulfide/Graphene/Carbon Nanotube Composites as Electrode Material for the Supercapacitor Application in the Sea Flashing Signal System
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作者 Hailong Chen Ji Li +4 位作者 Conglai Long Tong Wei Guoqing Ning Jun Yan Zhuangjun Fan 《Journal of Marine Science and Application》 2014年第4期462-466,共5页
This work presents NiS/graphene/carbon nanotube (NiS/GNS/CNT) composites as electrode material for the supercapacitor application in sea flashing signal systems. NiS nanosheets were closely anchored on the conductiv... This work presents NiS/graphene/carbon nanotube (NiS/GNS/CNT) composites as electrode material for the supercapacitor application in sea flashing signal systems. NiS nanosheets were closely anchored on the conductive GNS-CNT networks. As a result, the NiS/GNS/CNT electrode showed a high specific capacitance of 2 377 F.g^-1 at 2 mV.s^-1 and good cycling stability compared with the pure NiS (1 599F.g^-1). The enhanced electrochemical performances are attributed to the synergetic effect between the conductive carbon and the pseudo-capacitive NiS. The high performance supercapacitor may provide application in the sea flashing signal system. 展开更多
关键词 flashing signal system electrochemical performances NiS/graphene/carbon nanotube composites SUPERCAPACITOR
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碳纳米管/聚苯胺柔性自支撑复合电极材料的制备及其电化学性能研究 被引量:1
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作者 谭徜彬 何正江 +3 位作者 邱涵 张金铭 唐杨 阳龑 《化工新型材料》 CAS CSCD 北大核心 2023年第4期145-150,共6页
基于原位化学氧化聚合并结合真空辅助成型获得了聚苯胺(PANI)包裹碳纳米管(CNTs)的CNTs/PANI自支撑复合电极,采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和傅里叶红外光谱测试仪(FT-IR)对CNTs/PANI复合膜的微观形貌和结构进行表征,并利... 基于原位化学氧化聚合并结合真空辅助成型获得了聚苯胺(PANI)包裹碳纳米管(CNTs)的CNTs/PANI自支撑复合电极,采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和傅里叶红外光谱测试仪(FT-IR)对CNTs/PANI复合膜的微观形貌和结构进行表征,并利用电化学工作站对其电化学性能进行了测试。实验结果表明,CNTs被PANI颗粒均匀包覆。CNTs/PANI-15(CNTs与An的质量比为1∶15)复合电极的比电容为387F/g(电流密度为0.5A/g),且在3A/g电流密度下连续循环10000圈时,电容保持率为86%。而纯PANI在8000次循环充放电测试后,电容保持率低至66%,且结构几乎坍塌。其原因在所制备的CNTs/PANI复合电极材料兼具PANI的赝电容和CNTs的双电层电容的双重储能机理,通过二者的协同作用显著改善了CNTs/PANI复合膜的电化学性能。 展开更多
关键词 碳纳米管 聚苯胺 超级电容器 电化学性能
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具有纳米结构的木材气凝胶基电极的制备及其电化学性能 被引量:1
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作者 郭飞宇 何文 +5 位作者 王瑞 韦柏任 梁爽 季秋琳 胡纲正 李文轩 《林业工程学报》 CSCD 北大核心 2023年第6期122-130,共9页
超级电容器作为清洁可持续的储能设备,其电化学性能主要由电极材料决定,因此电极材料逐渐成为当前储能领域的研究热点。木材因其天然的多尺度微/纳米孔隙结构以及可再生、可生物降解等特点,逐渐被用于电极材料的研究。以巴沙木为基材,... 超级电容器作为清洁可持续的储能设备,其电化学性能主要由电极材料决定,因此电极材料逐渐成为当前储能领域的研究热点。木材因其天然的多尺度微/纳米孔隙结构以及可再生、可生物降解等特点,逐渐被用于电极材料的研究。以巴沙木为基材,首先采用脱木素联合TEMPO氧化法将木材细胞壁分离具有纳米网络结构的木材气凝胶(TDW),然后将纳米纤维素分散的碳纳米管(CNT)悬浮液通过满细胞法浸渍到木材气凝胶中,冷冻干燥后在导管孔和细胞间隙中形成了连续的碳纳米管导电网络结构,最后进行聚吡咯(PPy)原位聚合,在细胞壁和导管孔中构建成具有纳米导电网络结构的TDW/CNT/PPy复合电极。电化学性能测试显示,由于在TDW的宏观孔隙中导电网络的构建,TDW/CNT/PPy的电化学性能明显优于TDW/PPy电极,而且随着碳纳米管比例的增加而增强,其中,TDW/CNT-2/PPy在1.0 mA/cm^(2)扫描速率下的比电容达到389 F/g、面电容为10.5 F/cm^(2),而且在10 mA/cm^(2)扫描速率下经过10000次循环后的电容保持率为95.1%。本研究通过在木材中构建连续的导电纳米网络结构,显示出优异的电化学性能,为木质基材在电极材料中的应用提供了一种新的思路。 展开更多
关键词 木材气凝胶 纳米结构 碳纳米管 聚吡咯 电化学性能
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NiCo_(2)O_(4)/碳纳米管纤维织物的制备及电化学性能研究
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作者 梁云霞 罗晓刚 +3 位作者 张扬 杨利军 潘亮 朱美芳 《合成纤维工业》 CAS 2023年第4期20-25,30,共7页
采用浮动催化化学气相沉积工艺,结合加捻和针织技术制备碳纳米管纤维织物;经热氧化和酸处理过程得到表面处理后的碳纳米管纤维织物(ACNTFF);通过水热法和热处理制得钴酸镍(NiCo_(2)O_(4))/ACNTFF织物电极;研究水热反应时间对织物电极的... 采用浮动催化化学气相沉积工艺,结合加捻和针织技术制备碳纳米管纤维织物;经热氧化和酸处理过程得到表面处理后的碳纳米管纤维织物(ACNTFF);通过水热法和热处理制得钴酸镍(NiCo_(2)O_(4))/ACNTFF织物电极;研究水热反应时间对织物电极的形貌、负载量、导电性、结构和电化学性能的影响。结果表明:NiCo_(2)O_(4)纳米线阵列在水热反应6 h的织物表面分布相对均匀;水热反应时间的延长可增加NiCo_(2)O_(4)的负载量;制备的NiCo_(2)O_(4)/ACNTFF具有良好的导电性;水热反应6 h的NiCo_(2)O_(4)/ACNTFF电极具有最优综合电化学性能,包括较高的面积比电容(面积比电容为1630.1 mF/cm^(2))、良好的倍率性能(电流密度为50 mA/cm^(2)时的电容保持率为70.7%)和良好的循环稳定性(10000次充放电循环后的电容保持率为80.4%)。 展开更多
关键词 碳纳米管纤维织物 钴酸镍 织物电极 电化学性能 面积比电容
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Single-walled Carbon Nanotubes as Electrode Materials for Supercapacitors 被引量:12
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作者 徐斌 吴锋 +3 位作者 王芳 陈实 曹高萍 杨裕生 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2006年第11期1505-1508,共4页
Large-scale synthesized single-walled carbon nanotubes (SWNT) prepared by electric arc discharge method and a mixture of NiO and Y2O3 as catalyst have been used as electrode materials for supercapacitors. N2 adsorpt... Large-scale synthesized single-walled carbon nanotubes (SWNT) prepared by electric arc discharge method and a mixture of NiO and Y2O3 as catalyst have been used as electrode materials for supercapacitors. N2 adsorption/desorption measurement shows that the SWNT is a microporous and mesoporous material with specific surface area 435 m^2·g^-1. The specific capacitance of the nitric acid treated SWNT in aqueous electrolyte reaches as high as 105 F/g, which is a combination of electric double layer capacitance and pseudocapacitance. The SWNT-based capacitors also have good charge/discharge reversibility and cycling perdurability. 展开更多
关键词 single-walled carbon nanotube SUPERCAPACITOR capacitance
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MnO_(2)/ACNT复合材料的制备及其电化学性能研究
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作者 王玉琪 康乐 《化工新型材料》 CAS CSCD 北大核心 2023年第S02期307-311,共5页
将有序碳纳米管(ACNT)直接生长在铝箔表面上,通过高锰酸根离子的自发还原反应将MnO_(2)薄膜沉积在ACNT上制备出MnO_(2)/ACNT复合材料。研究了不同温度和气氛热处理条件下MnO_(2)/ACNT复合材料作为超级电容器电极材料的电化学行为。利用... 将有序碳纳米管(ACNT)直接生长在铝箔表面上,通过高锰酸根离子的自发还原反应将MnO_(2)薄膜沉积在ACNT上制备出MnO_(2)/ACNT复合材料。研究了不同温度和气氛热处理条件下MnO_(2)/ACNT复合材料作为超级电容器电极材料的电化学行为。利用扫描电镜、透射电镜、循环伏安和恒流充放电等测试对复合电极材料进行分析。结果表明:MnO_(2)/ACNT复合材料保留了碳纳米管的线状结构,MnO_(2)呈鳞片状包覆在碳纳米管的表面。当热处理温度为200℃时,在空气、氩气以及氩氢混合气氛中复合材料的比容量均达到最高值分别为189.3F/g、220.2F/g和203.6F/g。 展开更多
关键词 二氧化锰 碳纳米管 电化学性能 超级电容器
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Template-Free Synthesis of Ordered Mesoporous NiO/Poly (Sodium-4-Styrene Sulfonate) Functionalized Carbon Nanotubes Composite for Electrochemical Capacitors 被引量:1
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作者 Changzhou Yuan Shenglin Xiong +4 位作者 Xiaogang Zhang Laifa Shen Fang Zhang Bao Gao Linhao Su 《Nano Research》 SCIE EI CSCD 2009年第9期722-732,共11页
We report the first example of a practical and efficient template-free strategy for synthesizing ordered mesoporous NiO/poly(sodium-4-styrene sulfonate)(PSS)functionalized carbon nanotubes(FCNTs)composites by calcinin... We report the first example of a practical and efficient template-free strategy for synthesizing ordered mesoporous NiO/poly(sodium-4-styrene sulfonate)(PSS)functionalized carbon nanotubes(FCNTs)composites by calcining a Ni(OH)_(2)/FCNTs precursor prepared by refl uxing an alkaline solution of Ni(NH_(3))x^(2)+and FCNTs at 97 oC for 1 h.The morphology and structure were characterized by X-ray diffraction,scanning electron microscopy,and transmission electron microscopy.Thermal decomposition of the precursor results in the formation of ordered mesoporous NiO/FCNTs composite(ca.48 wt%NiO)with large specifi c surface area.Due to its enhanced electronic conductivity and hierarchical(meso-and macro-)porosity,composite simultaneously meets the three requirements for energy storage in electrochemical capacitors at high rate,namely,good electron conductivity,highly accessibleelectrochemical surface areas owing to the existence of mesopores,and efficient mass transport from the macropores.Electrochemical data demonstrated that the ordered mesoporous NiO/FCNTs composite is capable of delivering a specifi c capacitance(SC)of 526 F/g at 1 A/g and a SC of 439 F/g even at 6 A/g,and show a degradation of only ca.6%in SC after 2000 continuous charge/discharge cycles. 展开更多
关键词 TEMPLATE-FREE ordered mesopores NiO/carbon nanotubes composite hierarchical porosity electrochemical supercapacitors
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Flexible supercapacitors based on carbon nanotubes 被引量:8
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作者 Lili Liu Zhiqiang Niu Jun Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第4期571-581,共11页
Since carbon nanotubes(CNTs) possess unique one dimensional(1D) structure, considerable attention has been paid to constructing CNTs into macroscopic materials with different dimensions, including 1D fibers,2D fil... Since carbon nanotubes(CNTs) possess unique one dimensional(1D) structure, considerable attention has been paid to constructing CNTs into macroscopic materials with different dimensions, including 1D fibers,2D films, and 3D foams. Such macroscopic CNT materials exhibit high conductivity, large surface area, as well as good mechanical properties, and thus can be directly used as the flexible supercapacitor(SC) electrodes or the scaffolds for supporting pseudo-capacitive electrode materials. Based on these macroscopic CNT electrodes, diverse SCs with different structures, including flexible, stretchable and/or compressible fiber and thin film SCs, have been designed. This review provides an overview of recent progress towards the development of flexible SCs based on macroscopic CNTs-based electrodes, with a focus on electrode preparation and configuration design as well as their integration with other multifunctional devices.Future development and prospects in the CNTs-based flexible SCs are also discussed. 展开更多
关键词 carbon nanotubes Flexible supercapacitors Macroscopic materials Pseudo-capacitive materials Integration
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多壁碳纳米管结构与其电化学容量之间关系的研究 被引量:15
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作者 江奇 刘宝春 +3 位作者 瞿美臻 周固民 张伯兰 于作龙 《化学学报》 SCIE CAS CSCD 北大核心 2002年第8期1539-1542,共4页
采用化学气相沉积法 ,通过改变催化剂的成分、碳源、反应和后处理条件来制备不同管径、管长、石墨化程度的多壁碳纳米管 .经电化学容量性能测试、透射电子显微镜观察和N2 吸附等结构表征 ,发现管径分布为 30 0~ 4 0 0nm、管长越短、... 采用化学气相沉积法 ,通过改变催化剂的成分、碳源、反应和后处理条件来制备不同管径、管长、石墨化程度的多壁碳纳米管 .经电化学容量性能测试、透射电子显微镜观察和N2 吸附等结构表征 ,发现管径分布为 30 0~ 4 0 0nm、管长越短、石墨化程度越低、比表面积越大、孔容越大的多壁碳纳米管具有更好的电化学容量 . 展开更多
关键词 多壁碳纳米管 电化学容量 结构 电化学超级电容器 材料 化学气相沉积
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超级电容器炭电极材料孔结构对其性能的影响 被引量:37
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作者 庄新国 杨裕生 +2 位作者 嵇友菊 杨冬平 唐致远 《物理化学学报》 SCIE CAS CSCD 北大核心 2003年第8期689-694,共6页
采用无瓶颈的系列酚醛树脂活性炭为电极材料,用氮吸附和恒流充、放电,以及交流阻抗法,研究孔径和孔表面积等孔结构对其性能的影响.结果表明,活性炭电极材料双电层电容与微孔(孔宽度<2.0nm)表面和外孔(孔宽度>2.0nm)表面都有关系,... 采用无瓶颈的系列酚醛树脂活性炭为电极材料,用氮吸附和恒流充、放电,以及交流阻抗法,研究孔径和孔表面积等孔结构对其性能的影响.结果表明,活性炭电极材料双电层电容与微孔(孔宽度<2.0nm)表面和外孔(孔宽度>2.0nm)表面都有关系,但主要取决于微孔表面双电层电容.微孔表面比电容为21.4μF·cm-2,外孔表面比电容<10μF·cm-2.外孔表面比电容较低可能是由于空间电荷层的影响.微孔孔径较大的炭材料具有高比电容和良好的高倍率放电的特性. 展开更多
关键词 超级电容器 炭电极材料 孔结构 性能 电容 酚醛树脂活性炭 电池 孔径分布
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