Effect of particle size on the electrochemical properties of MmNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy

被引：21

作者：

Zhao, Xiangyu ^{[1
]}

Ma, Liqun ^{[1
]}

Ding, Yi ^{[1
]}

Shen, Xiaodong ^{[1
]}

机构：

[1] Nanjing Univ Technol, Coll Mat Sci & Engn, Nanjing 210009, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2009年 / 34卷 / 08期

关键词：

Hydrogen storage alloy; Particle size; High rate dischargeability; Charge-transfer; Hydrogen diffusion; METAL HYDRIDE ELECTRODES; SECONDARY BATTERIES; ALKALINE-SOLUTION; NI; PERFORMANCE; DIFFUSION; TRANSPORT;

D O I：

10.1016/j.ijhydene.2009.02.046

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Charge and discharge testing, linear polarization, electrochemical impedance spectroscopy (EIS) and potential step chronoamperometry (PSCA) were used to investigate the electrochemical properties of the Ce-rich mischmetal MmNi(3.8)CO(0.75)Mno(0.4)Al(0.2) hydrogen storage alloy with different particle sizes. At a discharge current density of 900 mA/g, the alloy with small original particle size maintained a high rate dischargeability (HRD) above 86% while the alloy with large particle size could not discharge in the same potential region. The alloy with small original particle size also showed lower contact resistances and polarization resistance after full activation. Both the exchange current density and the hydrogen diffusion coefficient increased when the hydrogen concentration decreased. The charge-transfer reaction on the surface of alloy particles with different sizes should be mainly responsible for the differences in electrochemical properties, especially the HRD. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：3389 / 3394

页数：6

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