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首页> 外文会议>International Symposium on Hydrogen at Surface and Interfaces, May, 2000, Toronto >STUDIES ON THE HYDROGEN TRANSPORT RATE IN METAL HYDRIDE ALLOYS
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STUDIES ON THE HYDROGEN TRANSPORT RATE IN METAL HYDRIDE ALLOYS

机译：金属氢化物中氢的输运速率研究

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摘要

An analytical impedance model of the metal hydride electrode was used to calculate the diffusion coefficient of hydrogen in the metal alloy. The impedance response of cobalt coated LaNi_(4.27)Sn_(0.24) electrode was measured at different hydrogen contents. From the slope of the Nyquist plot in the transition region the diffusion coefficient of hydrogen was calculated at various state of charge (SOC). It is seen that the diffusion coefficient increases with the hydrogen content in the alloy. Electrochemical impedance spectroscopy was also used as an in-situ technique to determine the average particle size of metal hydride electrodes. Using this the pulverization of bare LaNi_(4.27)Sn_(0.24) alloy was studied as a function of charge-discharge cycles. It is seen that pulverization causes an exponential decay in the particle size with cycling.
机译：使用金属氢化物电极的分析阻抗模型来计算氢在金属合金中的扩散系数。在不同的氢含量下测量了钴包覆的LaNi_（4.27）Sn_（0.24）电极的阻抗响应。根据过渡区奈奎斯特图的斜率，可以计算出各种荷电状态（SOC）下的氢扩散系数。可以看出，扩散系数随合金中氢含量的增加而增加。电化学阻抗谱也用作原位技术来确定金属氢化物电极的平均粒径。使用该方法研究了裸露的LaNi_（4.27）Sn_（0.24）合金的粉化与充放电循环的关系。可以看出，粉化会导致颗粒尺寸随循环呈指数衰减。

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