摘要
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MnO_(2)纳米片,经热处理获得空心Co_(3)O_(4)@MnO_(2)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,Co_(3)O_(4)@MnO_(2)/泡沫镍(Co_(3)O_(4)@MnO_(2)/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@MnO_(2)/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.MnO_(2) nanosheets are grown on ZIF-67 via hydrothermal method, and become hollow Co_(3)O_(4)@MnO_(2) core-shell structure through heat treatment.The surface reticulated MnO_(2) 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 Co_(3)O_(4)@MnO_(2)/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@MnO_(2)/NF electrode(192.8 F·g^(-1)).Its specific capacitance still maintains 80.5% of the maximum value after 5 000 cycles.
作者
周春荣
ZHOU Chun-rong(School of Intelligent Manufacturing and Automobile,Chongqing Vocational College of Transportation,Chongqing 402247,China)
出处
《现代化工》
CAS
CSCD
北大核心
2022年第1期127-131,共5页
Modern Chemical Industry
基金
国家自然科学基金(21403020)。
