以泡沫镍(NF)为自支撑集流体,通过溶剂热法和焙烧处理制备了NiCo₂O₄/NF自支撑电极,利用XRD、SEM、TEM、XPS、氮气吸脱附对NiCo₂O₄/NF的化学组成及微观结构进行表征,结果发现,由细小纳米颗粒组成的线状NiCo₂O₄有序、垂直生长于NF骨架表面,NiCo₂O₄/NF具有的高比表面积和大量孔结构促进了电解液和电极间的充分接触,NF作为基底有利于提高NiCo₂O₄的结构稳定性。同时,对NiCo₂O₄/NF电极进行了电化学测试,结果表明,NiCo₂O₄/NF在0.5 A/g下的比电容达 1 095 F/g,10 A/g的容量保持率为68.3%,说明其具有良好的倍率性能。此外,经过999次循环,NiCo₂O₄/NF的比容量为初始比电容的82.3%。

A self-supporting 3D NiCo₂O₄/NF electrode is synthesized via solvothermal process and calcination treatment with Ni foam (NF) as self-supporting current collector.The chemical composition and microstructure of NiCo₂O₄/NF are observed by virtue of XRD,SEM,TEM,XPS and nitrogen adsorption-desorption isotherm.It is found that NiCo₂O₄ nanowires composed of small nanoparticles vertically grow on NF skeleton surface in order.The high active specific surface area and numerous pores in NiCo₂O₄/NF electrode are beneficial for the complete contact between electrolyte and electrode,and NF as substrate improves the structural stability of NiCo₂O₄ nanowires.What is more,the electrochemical performance of NiCo₂O₄/NF is characterized.NiCo₂O₄/NF shows a high specific capacitance of 1 095 F·g^-1 at 0.5 A·g^-1 and a moderate capacitance retention of 68.3% at 10 A·g^-1 which declares a good rate performance.In addition,the good capacitance retention of about 82.3% is achieved after 999 cycles.

李艳华(1998-),女,博士研究生,研究方向为二维材料的结构调控及性能优化,liyh@stu.ncst.edu.cn。