Assembly of flexible CoMoO4@NiMoO4 center dot xH(2)O and Fe2O3 electrodes for solid-state asymmetric supercapacitors

作者：Wang, Jing; Zhang, Leipeng; Liu, Xusong; Zhang, Xiang; Tian, Yanlong; Liu, Xiaoxu; Zhao, Jiupeng^*; Li, Yao^*

来源：Scientific Reports, 2017, 7(1): 41088.

DOI：10.1038/srep41088

• HIGH-PERFORMANCE
• ENERGY-DENSITY
• CARBON-FIBER
• LOW-COST
• ELECTROCHEMICAL PERFORMANCE
• HYDROTHERMAL SYNTHESIS
• NANOWIRE ARRAYS
• POROUS CARBON
• GRAPHENE
• COMPOSITES

In this work, CoMoO4@NiMoO4 center dot xH(2)O core-shell heterostructure electrode is directly grown on carbon fabric (CF) via a feasible hydrothermal procedure with CoMoO4 nanowires (NWs) as the core and NiMoO4 nanosheets (NSs) as the shell. This core-shell heterostructure could provide fast ion and electron transfer, a large number of active sites, and good strain accommodation. As a result, the CoMoO4@NiMoO4 center dot xH(2)O electrode yields high-capacitance performance with a high specific capacitance of 1582 F g(-1), good cycling stability with the capacitance retention of 97.1% after 3000 cycles and good rate capability. The electrode also shows excellent mechanical flexibility. Also, a flexible Fe2O3 nanorods/CF electrode with enhanced electrochemical performance was prepared. A solid-state asymmetric supercapacitor device is successfully fabricated by using flexible CoMoO4@NiMoO4 center dot xH(2)O as the positive electrode and Fe2O3 as the negative electrode. The asymmetric supercapacitor with a maximum voltage of 1.6 V demonstrates high specific energy (41.8 Wh kg(-1) at 700 W kg(-1)), high power density (12000 W kg(-1) at 26.7 Wh kg(-1)), and excellent cycle ability with the capacitance retention of 89.3% after 5000 cycles (at the current density of 3A g(-1)).

• 出版日期2017-1-20
• 单位哈尔滨工业大学; 黑龙江科技大学