纳米氧化铜掺杂对储氢合金电极性能的影响

采用纳米氧化铜作为添加剂制备储氢合金电极, 考察了氧化铜对储氢合金电池储备容量的调节作用, 分析了掺杂后电极及电池质量的变化, 研究了掺杂合金电极的电化学性能, 并用SEM、EIS、CV等方法分析了反应的电化学机理. CV、SEM结果表明, 氧化铜在首次充电过程中被还原成低价态沉积在合金颗粒表面, 由于氧化铜比容量远大于合金, 可以通过掺杂氧化铜调节合金的储备容量. 电化学测试结果表明, 掺杂合金电极具有更好的高倍率充放电能力和循环性能. EIS分析结果表明, 掺杂合金电极导电性增强, 电化学活性提高.

Effect of Nanometer CuO Additive on the Performance of Hydrogen Storage Alloy Electrode

The effects of nanometer CuO additive on the performance of La-rich AB5 type hydrogen storage alloyelectrodes(HSAE) have been studied. The change of storage capacity and mass of the electrodes with CuO additivehas been investigated, and the electrochemical performances of the electrodes have been tested. Cyclic voltammograms(CV) and SEM results indicated that CuO is reduced during first charging process and copper particleis deposited onthe surface of the alloy. Electrochemical testing results showed that the electrode with additive has better rate capabilityand cycle performance. Electrochemical impedance spectroscopy(EIS) analysis indicated that the electrode withadditive CuO has higher activity and electrical conductivity, and lower ohmic and electrochemical impedance,which helps to improve the electrochemical properties of the electrode. Therefore the hydrogen storage alloyelectrode with nanometer CuO would well meet the requirement for power sources of electric vehicles.