聚吡咯包覆的NiCo_(2)O_(4)复合材料的制备及电化学性能

Preparation and Electrochemical Properties of Polypyrrole-Coated NiCo2O4 Composites

过渡金属氧化物是新型的超级电容器电极材料,合理构建电极材料结构一直是储能领域的研究热点。采用典型的水热法制备了一种花状NiCo_(2)O_(4),通过氧化聚合法合成了聚吡咯(PPy)包覆的NiCo_(2)O_(4)(NiCo_(2)O_(4)@PPy)复合材料,有效地解决了过渡金属氧化物的比表面积低、导电率差、活性物质易团聚等问题。并对NiCo_(2)O_(4)@PPy纳米复合材料结构和形貌进行表征,将其用作超级电容器的电极材料。在三电极体系下测试电化学性能。结果表明电流密度1 A/g时的比电容达到1826.5F/g,在5 A/g电流密度下5000次充放电循环后比电容保持率为98.35%,具有良好的循环稳定性。结果表明,NiCo_(2)O_(4)@PPy复合材料是很有前途的超级电容器电极材料。

Transition metal oxides are new electrode materials for supercapacitors,reasonable construction of electrode material structures has always been a research hot spot in the field of energy storage.A flower-like NiCo_(2)O_(4) was prepared by a typical hydrothermal method,the polypyrrole(PPy)-coated NiCo_(2)O_(4)(NiCo_(2)O_(4)@PPy)composites were synthesized by oxidative polymerization,effectively solving the problems of low specific surface area,poor conductivity and easy agglomeration of active substances for transition metal oxides.The structure and morphology of the NiCo_(2)O_(4)@PPy nanocomposites were characterized and used as the electrode material for supercapacitors.The electrochemical performance was tested under three-electrode system.The results show that the specific capacitance reaches 1826.5 F/g when the current density is 1 A/g.The specific capacitance retention is 98.35%after 5000 cycles of charge-discharge at 5 A/g current density,indicating the good cycle stability.The results demonstrate that NiCo_(2)O_(4)@PPy composites are promising electrode materials for supercapacitors.