Abstract The design and synthesis of hierarchical micro-nano structures of transition metal oxides have played an essential role in the supercapacitor field. In this work, in situ three-dimensional construction of nanoporous cobalt oxide (Co3O4) has been derived from the metal-organic framework (MOF) distributed evenly in electrospun polyacrylonitrile nanofibers. Due to large specific surface area and network architectures, the as-synthesized Co3O4 electrode notably presents a high specific capacitance of 970 F/g at a current density of 1 A/g. Besides, the as-obtained electrode exhibits a high energy density of 54.6 Wh/kg at a power density of 360.6 W/kg and maintains a capacitance retention of 77.5% after 5000 cycles at 6 A/g. Therefore, this method paves a way to produce the nanoporous MOF-derived Co3O4 network architecture as advanced electrodes materials, which shows an application potential for the energy storage industry.

中文翻译：

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基于静电纺丝技术的超级电容器Co3O4电极分层结构构建

摘要 过渡金属氧化物分级微纳米结构的设计和合成在超级电容器领域发挥了重要作用。在这项工作中，纳米多孔氧化钴 (Co3O4) 的原位三维结构源自均匀分布在电纺聚丙烯腈纳米纤维中的金属有机骨架 (MOF)。由于大的比表面积和网络结构，合成的 Co3O4 电极在 1 A/g 的电流密度下显着地表现出 970 F/g 的高比电容。此外，所获得的电极在 360.6 W/kg 的功率密度下表现出 54.6 Wh/kg 的高能量密度，并在 6 A/g 下 5000 次循环后保持 77.5% 的电容保持率。所以，