Electrochemical impedance spectroscopy study of the metal hydride alloy/electrolyte junction

被引：29

作者：

Khaldi, Chokri ^{[1
]}

Mathlouthi, Hamadi ^{[1
]}

Lamloumi, Jilani ^{[1
]}

机构：

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

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 479卷 / 1-2期

关键词：

Metal hydride alloy; Cyclic voltammetry; Electrochemical impedance spectroscopy (EIS); Circuit description code (CDC); HYDROGEN STORAGE ALLOY; POLYSUBSTITUTED INTERMETALLIC HYDRIDES; NI-MH BATTERIES; ELECTRODE; IRON; DISCHARGE; STATE; CYCLE; EIS;

D O I：

10.1016/j.jallcom.2008.12.150

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：

The behaviour of the LaNi(3.55)Mn(0.4)Al(0.3)Co(0.75) alloy, used as a negative electrode in the Ni-MH batteries, was studied by the electrochemical impedance spectroscopy (EIS), measured at different potentials. The modeling of the EIS spectra allows us to model the interface electrolyte/Ni-MH electrode by a succession of interfaces electrolyte/corrosion film/alloy particles. The various processes and the physics parameters of each interface are discussed and evaluated. When the potential shifts to more negative values, two reactions are in competition: the hydrogen molecular evolution and the hydrogen atomic absorption. The hydrogen diffuses in the bulk of the alloy and the diffusion is not the limiting factor for the hydrogen absorption. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：284 / 289

页数：6

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