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首页> 外文会议>International Symposium on Hydrogen at Surface and Interfaces, May, 2000, Toronto >THE ELECTROCHEMICAL IMPEDANCE OF METAL HYDRIDE ELECTRODES
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THE ELECTROCHEMICAL IMPEDANCE OF METAL HYDRIDE ELECTRODES

机译：金属氢化物电极的电化学阻抗

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摘要

The electrochemical impedance responses for different laboratory type metal hydride electrodes were successfully modelled and fitted to experimental data for AB_5 type hydrogen storage alloys. The models fitted the experimental data remarkably well. The simulation models presented differ from those previously reported in literature by their smooth fit to the experimental results for all frequencies in the range from 10KHz to 0.lmHz. Especially the fit at the lower frequencies was notable. Both charge transfer and spherical diffusion of hydrogen in the particles are important sub processes that governs the total rate of the electrochemical hydride absorption/desorption reaction. To fit the experimental data, equations describing the current distribution in porous electrodes were needed. Indications of one or more parallel reduction/oxidation processes competing with the electrochemical hydride absorption/desorption reaction were observed. The impedance analysis was found to be an efficient method for characterizing hydride electrodes in situ.
机译：成功地模拟了不同实验室类型的金属氢化物电极的电化学阻抗响应，并将其拟合为AB_5型储氢合金的实验数据。这些模型非常适合实验数据。所呈现的仿真模型与先前文献中所报道的那些仿真模型的不同之处在于，它们在10KHz至0.lmHz范围内的所有频率下均能顺利拟合实验结果。特别是在较低频率下的拟合非常显着。粒子中氢的电荷转移和球形扩散都是控制电化学氢化物吸收/解吸反应总速率的重要子过程。为了拟合实验数据，需要描述多孔电极中电流分布的方程式。观察到与电化学氢化物吸收/解吸反应竞争的一种或多种平行还原/氧化过程的迹象。发现阻抗分析是一种用于就地表征氢化物电极的有效方法。

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