以二甲基咪唑和六水硝酸钴为原料合成ZIF-67，采用水热法在ZIF-67表面生长MnO₂纳米片，经热处理获得空心Co₃O₄@MnO₂核壳材料。表面网状纳米片具有更多的活性位点，同时为电解液渗透提供扩散通道，空心材料的薄壁提高了电子的迁移效率。电容性能测试结果表明，Co₃O₄@MnO₂/泡沫镍（Co₃O₄@MnO₂/NF）电极在0.5 A/g电流密度下容量达到278.3 F/g，高于ZIF-67/NF电极（53.7 F/g）和ZIF-67@MnO₂/NF电极（192.8 F/g）；循环5 000次后容量仍保持了最大值的80.5%，具有优异的稳定性。

ZIF-67 is synthesized from dimethylimidazole and cobalt nitrate hexahydrate.MnO₂ nanosheets are grown on ZIF-67 via hydrothermal method,and become hollow Co₃O₄@MnO₂ core-shell structure through heat treatment.The surface reticulated MnO₂ nanosheets provide more electrochemical active sites and diffusion channels for electrolyte.Moreover,the thin shell of hollow materials accelerates the electrons transfer rate.It is indicated through capacitance performance test that Co₃O₄@MnO₂/NF electrode has a specific capacitance of 278.3 F·g^-1 at a current density of 0.5 A·g^-1,which is higher than ZIF-67/NF electrode (53.7 F·g^-1) and ZIF-67@MnO₂/NF electrode (192.8 F·g^-1).Its specific capacitance still maintains 80.5% of the maximum value after 5 000 cycles.