Effect of Si on electrochemical hydrogen storage properties of crystalline Co

Effect of Si on electrochemical hydrogen storage properties of crystalline Co
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Si对晶态Co电化学储氢性能的影响

DOI:
10.1016/j.ijhydene.2007.12.007
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发表时间:
2008-02
影响因子:
7.2
通讯作者:
Zhang, Yanhui
Zhang, Yanhui
中科院分区:
工程技术2区
文献类型:
--
作者:
Jiao, Lifang;Yuan, Huatang;Wang, Yijing;Zhang, Yunyun;Liu, Li;Zhang, Yanhui

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为了研究Si对结晶Co电化学性能的影响,采用Co和Si简单混合的方法合成了Co - Si样品,研究了其作为镍氢电池负极在KOH水溶液中的电化学性能。结果表明,所制备的样品均具有良好的电化学性能。当Co / Si质量比为4:1时,样品电极在制备的材料中表现最好,在放电电流密度为25mAg-1时,其最大放电容量为419.9 mahg -1,循环50次后容量仍为352.2 mahg -1,保持率为83.9%。电极反应机理分析表明,放电容量归因于Co的加氢反应,其中至关重要的是Si具有催化活性。
To investigate the effect of Si on the electrochemical properties of crystalline Co, Co–Si samples were synthesized by simple mixing of Co and Si, the electrochemical properties of them were studied as negative electrodes for nickel–metal hydride batteries in aqueous KOH solution. The results show that all the samples possess excellent electrochemical characteristics. When the weight ratio of Co to Si is 4:1, the sample electrode shows the best performance among the as-prepared materials, whose maximum discharge capacity is 419.9mAhg-1and the capacity remains 352.2mAhg-1after 50 cycles at the discharge current density 25mAg-1, the retention rate is 83.9%. Analysis of electrode reaction mechanism demonstrates that the discharge capacity is attributed to hydrogenation of Co, where the crucial role Si has a catalytic activity.
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