An impedance model for electrode processes in metal hydride electrodes

被引：25

作者：

Valoen, LO ^{[1
]}

Sunde, S ^{[1
]}

Tunold, R ^{[1
]}

机构：

[1] SINTEF,MAT TECHNOL,N-7034 TRONDHEIM,NORWAY

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1997年 / 253卷

关键词：

hydride; impedance; diffusion; modelling; kinetics;

D O I：

10.1016/S0925-8388(96)02913-1

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：

A model for the impedance of granular metal hydride electrodes is presented. The model includes the rate of hydrogen exchange at the hydride-electrolyte interface and diffusion of hydrogen into the bulk of the hydride. The exchange reaction is assumed to occur in two steps: electrosorption of hydrogen at the interface and hydride formation. The subsequent transport process is approximated as spherical diffusion in the particles. The model was successfully fitted to experimental data for a misch metal/nickel based hydride forming compound (MmNi(3.5-3.7)Co(0.7-0.8)Mn(0.3-0.4)Al(0.3-0.4)) at different depths of discharge.

引用

页码：656 / 659

页数：4

共 7 条

[1]

AGARWAL P, 1992, HYDROGNE STORAGE MAT, V92, P120

[2]

Crank J, 1979, MATH DIFFUSION

[3] AC IMPEDANCE OF FARADAIC REACTIONS INVOLVING ELECTROSORBED INTERMEDIATES .1. KINETIC-THEORY [J].