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采用电弧熔炼法制备出不含Co的AB_5型储氢合金,并将其与纯钴粉按不同质量比复合制成复合电极。采用XRD分析了AB_5合金的相结构,使用恒流充放电测试、循环伏安测试以及交流阻抗测试来研究复合电极的电化学性能。结果表明,当无钴的AB5储氢合金与纯钴粉按质量比为1∶5复合时,复合电极的性能最佳,其最大放电容量为534.7mAh/g,循环充放电50次之后的容量保持率为69.6%。复合电极AB_5∶Co=1∶5充放电时主要发生Co与Co(OH)_2之间的氧化还原反应,AB5的存在对Co的放电起着催化作用,促进了Co/Co(OH)_2反应,放电容量明显增加。
The AB_5 type hydrogen storage alloy without Co was prepared by electric arc melting method, and then composited with pure cobalt powder at different mass ratios to form a composite electrode. The phase structure of AB_5 alloy was analyzed by XRD, and the electrochemical performance of the composite electrode was studied by constant current charge-discharge test, cyclic voltammetry and AC impedance test. The results show that the composite electrode has the best performance when the cobalt-free AB5 hydrogen storage alloy and the pure cobalt powder are compounded in a mass ratio of 1: 5. The maximum discharge capacity of the composite electrode is 534.7 mAh / g, the capacity after 50 cycles of charging and discharging Retention rate was 69.6%. The redox reaction between Co and Co (OH) _2 mainly occurs when the composite electrode AB_5: Co is 1: 5. The presence of AB5 plays a catalytic role in the discharge of Co and promotes the Co / Co (OH) _2 reaction , Discharge capacity increased significantly.