An asymmetric supercapacitor based on a NiO/Co3O4@NiCo cathode and an activated carbon anode
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摘要: 金属氧化物是一种颇具前景的超级电容器活性材料，然而较差的导电性阻碍了其实际应用。本文通过在高导电性镍钴纳米线上原位生长氧化镍和四氧化三钴活性物质，制备自支撑柔性氧化镍/四氧化三钴@镍钴一体化电极。纳米线表面原位生长活性物质可以提升活性物质与集流体间电子的传输效率。网络状纳米线结构利于离子传输并能释放充放电过程中形成的应力。基于这种独特的结构特点，氧化镍/四氧化三钴@镍钴电极在电流密度为5 mA cm-2时，具有1.36 F cm-2的比容量，循环10 000圈后仍然具有96.95%的容量保持率。氧化镍/四氧化三钴@镍钴与活性炭组装成的非对称超级电容器在能量密度为0.32 mWh cm-2时，具有8 mW cm-2的功率密度，证明此种材料在高性能超级电容器中的广阔应用前景。Abstract: Pseudocapacitive metal oxide active materials are promising for use in high performance supercapacitors. However, their poor electrical conductivity greatly hinders their practical application. We formed NiO and Co3O4 active materials on the surface of a highly conductive NiCo nanowire membrane current collector by a simple air oxidation method to fabricate a self-supported flexible NiO/Co3O4@NiCo electrode. This significantly improves electron transport at the interface between the current collector and the active NiO/Co3O4. Furthermore, the reticular nanowire network facilitates ion transportation and releases strain caused during charge and discharge. Due to this unique structural characteristic, the NiO/Co3O4@NiCo electrode delivers a high specific capacitance of 1.36 F cm-2 at a current density of 5 mA cm-2, and excellent cycling stability with a capacitance retention of 96.95% after 10 000 cycles. An asymmetric supercapacitor was assembled using the NiO/Co3O4@NiCo as the cathode and an activated carbon electrode as the anode, which delivered an energy density of 0.32 mWh cm-2 at a power density of 8 mW cm-2. Even at a high power density of 40 mW cm-2, an energy density of 0.17 mWh cm-2 was achieved, suggesting its promising use as an efficient electrode for high performance supercapacitors.
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Key words:
- Nickel oxide /
- Cobalt oxide /
- Activated carbon /
- Integrated electrode /
- Asymmetric supercapacitor
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