Ni-Ru复合氧化物的超电容特性研究

用化学共沉淀法和物理方法制得Ni和Ru的氢氧化物共沉淀物，经热处理得到NiO/RuO2复合氧化物. XRD分析表明, RuO2被大量的NiO颗粒所包覆.电化学测试表明, NiO电极材料中引入部分RuO2可以提高比能量和比电容，拓宽工作电位窗一倍以上.掺入10％ RuO2的NiO电极比能量达14.2 W•h•kg－1，比电容达210 F•g－1，而NiO电极比能量和比电容只有2.6 W•h•kg－1和118 F•g－1. 200周循环后，化学复合RuO2电极比电容保持在95％以上，物理复合电极仅保持在79％左右.

The Supercapacitive Properties of Ni-Ru Oxide Composites

NiO/RuO2 composite materials were prepared by chemical co-precipitation method, physical method and then heat-treatment. XRD spectra indicated that RuO2 particles were coated by NiO particles. Introduction of RuO2 into NiO electrodes improved the capacitive properties of electrodes and widened the range of work potential more than onefold. A maximum specific capacitance of 210 F•g－1 and specific energy of 14.2 W•h•kg－1 were obtained for NiO-based composite electrodes with 10％ RuO2 in 1 mol•L－1 KOH solution. By comparison of the chemical and physical introduction on the specific capacitance, the chemically modified composite electrodes had more stable properties. After 200 cycles, the specific capacitance of the chemical composite electrodes with 5％ RuO2 kept 95％ over the initial specific capacitance, but the physical composite electrodes were only 79％.