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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Electrochemical hydrogen absorbing properties of graphite/AB_5 alloy composite electrode
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Electrochemical hydrogen absorbing properties of graphite/AB_5 alloy composite electrode

机译：石墨/ AB_5合金复合电极的电化学吸氢性能

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摘要

Graphite is an inexpensive carbon material, but its hydrogen absorbing performance has attracted little attention. In this paper, in order to lower the cost of nickel metal-hydride (Ni-MH) battery, graphite is used as a hydrogen absorbing material in its negative electrode. The results of charge-discharge tests show that the graphite electrode has poor electrochemical hydrogen absorbing performance. The capacity of the graphite/AB5 alloy (90 wt%) composite electrode is close to AB5 alloy (298 mAh/g), but it has higher charge-discharge polarization and difficulty in activation. When graphite is modified with metal nickel powder by a simple ball milling process, the capacity of the composite electrode reaches to 315 mAh/g and its activation is accelerated. The results of electrochemical impedance spectroscopy (EIS) tests show that hydrogen diffusion in the modified composite electrode is more rapid than in AB5 alloy, thereby resulting in lower charge-discharge polarization and better discharge performance at large currents.
机译：石墨是廉价的碳材料，但是其吸氢性能很少受到关注。在本文中，为了降低镍氢（Ni-MH）电池的成本，石墨在负极中用作吸氢材料。充放电试验的结果表明，石墨电极的电化学吸氢性能较差。石墨/ AB5合金（90 wt％）复合电极的容量接近AB5合金（298 mAh / g），但充放电极化较高，难以活化。当通过简单的球磨工艺用金属镍粉对石墨进行改性时，复合电极的容量达到315 mAh / g，并加速了其活化。电化学阻抗谱（EIS）测试的结果表明，与AB5合金相比，改性复合电极中的氢扩散更快，从而导致较低的充放电极化和大电流放电性能。

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