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Graphene quantum dots/Ni(OH)_(2) nanocomposites on carbon cloth as a binder-free electrode for supercapacitors

Journal of Materials Science & Technology 2020年第23期58卷 73-79页

作者： Yiwen Hong Jingli Xu Jin Suk Chung Won Mook Choi School of Chemical Engineering University of Ulsan93 Daehak-ro Nam-guUlsan44610Republic of Korea College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceLongTeng Road 333201620ShanghaiPR China

Graphene quantum dots(GQDs)/Ni(OH)_(2) composites on carbon cloth(G-NH//CC) are prepared through simple hydrothermal reactions. The resulting G-NH//CC is employed as a binder-free electrode of supercapacitors. Due to the enhanced electrical conductivity and efficient ion transport by the addition of GQDs, the G-NH//CC electrode exhibits enhanced electrochemical performances. Specifically, the GNH//CC delivers a maximum specific capacitance of 1825 F g^(-1) at a current density of 1 A g^(-1) as well as a good cycle stability of 83.5 % capacity retention after 8000 cycles. Additionally, all-solid-state symmetric supercapacitor(SSC) is assembled with G-NH//CC composites as both positive and negative *** fabricated SSC exhibits a high energy density of 80.8 Wh kg^(-1)at a power density of 2021 W kg^(-1). The present study provides a facile and efficient strategy to prepare high-performance electrode materials for advanced electrochemical energy storage devices.

关键词： Graphene quantum dots Ni(OH)_(2) Carbon clothes symmetric supercapacitors

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Flexible double-wall carbon foam/Cu-Co oxides based symmetric supercapacitor with ultrahigh energy density

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Journal of Materials Science & Technology 2023年第29期160卷 109-117页

作者： Ruimei Yuan Xuemin Yin Shengyue Gu Jingjing Chang Hejun Li Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi’an 710071China Carbon/Carbon Composites Research Center Northwestern Polytechnical UniversityXi’an 710072China School of Science XI’AN University of Posts&TelecommunicationsXi’an 710121China

Electrochemical supercapacitors are regarded as a promising electrochemical energy storage device,because of its fast chargeability,long cycle life,and high power *** connection of porous carbon and extensive electroactive substances have significantly improved their ***,the unsuitable constructing strategy and unclear electrochemical mechanism lead to a mismatch between the fast double-layer effect and the sluggish Faradaic behavior at the electrode,degrading the energy density and capacitance ***,the construction strategy based on the double-wall carbon foam,carbon nanotubes and copper nanocubes provides enhanced electronic structure and ion transport path,resulting in accelerated proton transport and redox insertion/deinsertion processes,as well as surprising electrochemical behaviors of Cu-Co oxide on both positive and negative electrodes(927.9 and 427.0 F g^(−1)at 1 A g^(−1)).A flexible symmetric supercapacitor assembled with the SCF/CNT@Cu/Cu-Co-O delivers a extremely excellent *** 1 A g^(−1),the specific capacitance is 337.8 F g^(−1),the energy density hits 60 Wh kg^(−1)at the power density of 17.8 kW kg^(−1).At 10 A g^(−1),the energy density is up to 120.1 Wh kg^(−1),representing the top energy density of *** systematical structural optimization and mechanism study,this work broadens the fabricating strategy of hierarchical nanostructures and high-performance electrode materials for energy storage.

关键词： Carbon foam Cu-Co oxides symmetric supercapacitors Energy density

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