Kinetic behaviour of low-Co AB5-type metal hydride electrodes

被引：12

作者：

Tliha, M. ^{[1
]}

Boussami, S. ^{[1
]}

Mathlouthi, H. ^{[1
]}

Lamloumi, J. ^{[1
]}

Percheron-Guegan, A. ^{[2
]}

机构：

[1] ESSTT, Lab Mecan Mat & Procedes, Tunis 1008, Tunisia

[2] GLVT, Lab Chim Met Terres Rares, F-94320 Thiais, France

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2010年 / 175卷 / 01期

关键词：

Hydrogen insertion; Electrochemical kinetic; Hydrogen absorbing materials; Exchange current density; State of charge; HYDROGEN DIFFUSION-COEFFICIENT; NI-MH BATTERY; ELECTROCHEMICAL PROPERTIES; EVOLUTION REACTION; STORAGE; ALLOY; SUBSTITUTION; PERFORMANCE; IMPEDANCE; LA;

D O I：

10.1016/j.mseb.2010.07.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The kinetic behaviour of the LaNi3 55Mn0 4Al0 3Co0 Fe-4(0 35) metal hydride, used as a negative electrode in the nickel/metal hydride (Ni/MH) batteries, was investigated using electrochemical impedance spectroscopy (EIS) at different state of charge (SOC) Impedance measurements were performed in the frequency range from 50 kHz to 1 mHz Electrochemical impedance spectrum of the metal hydride electrode was interpreted by an equivalent circuit including the different electrochemical processes taking place on the interface between the MH electrode and the electrolyte Electrochemical kinetic parameters such as the charge-transfer resistance R-tc, the exchange current density I-0 and the hydrogen diffusion coefficient D-H were determined at different state of charge The results of EIS measurements indicate that the electrochemical reaction activity of the LaNi3 55Mn0 4Al0 3Co0 4Fe0 35 metal hydride electrode was markedly improved with increasing state of charge (SOC) The transformation alpha-beta is probably a limiting step in the mechanisms of hydrogenation of metal hydride electrode. (C) 2010 Elsevier B V All rights reserved

引用

页码：60 / 64

页数：5

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[1] An electrochemical study of mono-substituted intermetallic hydrides [J].