二氧化锰@三维纳米多孔金/泡沫镍复合电极材料用于高性能超级电容器

摘要

通过结合Au-Sn电化学沉积法与化学去合金法制备三维纳米多孔金(NPG)/泡沫镍(Ni foam)电极,采用电化学沉积法把二氧化锰(MnO2)沉积在NPG/Ni foam基底表面,获得MnO2@NPG/Ni foam复合电极材料.采用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线光电子能谱(XPS)等分析了MnO2@NPG/Ni foam复合电极材料的微观形貌和成分.将该复合电极材料作为超级电容器的电极材料,对其充放电特性和循环稳定性等电化学性能进行测试.结果表明,与直接在NiZam表面电化学沉积生长MnO2材料(MnO2@Ni foam)相比,MnO2@NPG/Ni foam复合电极材料拥有更高的比电容、反应可逆性以及循环性能.在l A/g的电流密度下,MnO2@NPG/Nifoam复合电极材料的比电容为377.9 F/g.经过在50 mV/s扫描速度下循环2500圈后,该电极材料的比容量保持在99％.%Three-dimensional nanoporous gold (NPG) was prepared on Ni foam through electrodeposition of Au-Sn alloy and chemical dealloying.MnO2 was electrodeposited on NPG/Ni foam to obtain the MnO2@NPG/Ni foam composite electrode material.The surface morphology and composition of the MnO2@NPG/Ni foam electrode were characterized by means of scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS).The as-prepared sample was employed as a supercapacitor electrode material,and its charge-discharge characteristics and cyclic stability were tested.The results show that the MnO2@NPG/Ni foam hybrid electrode exhibits a greatly enhanced specific capacitance,reversibility and cyclic stability compared to the MnO2@Ni foam electrode.The MnO2@NPG/Ni foam hybrid electrode provides a specific capacitance of 377.9 F/g at a current density of 1 A/g.The capacitance retention of the MnO2@NPG/Ni foam hybrid electrode remains 99％ after 2500 cycles at a scan rate of 50 mV/s.