Studies on the influence of palladium coatings on the electrochemical and structural properties of a metal hydride alloy

被引：16

作者：

Ambrosio, RC ^{[1
]}

Ticianelli, EA ^{[1
]}

机构：

[1] USP, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

来源：

SURFACE & COATINGS TECHNOLOGY | 2005年 / 197卷 / 2-3期

基金：

巴西圣保罗研究基金会;

关键词：

palladium deposition; electroless plating; XAS; metal hydride; discharge overpotential;

D O I：

10.1016/j.surfcoat.2004.07.087

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Electroless palladium deposition was made on the surface of LaNi4.7Sn0.3 metal hydride particles with the aim of studying the influence on the charge/discharge performance of this alloy. The palladium layer was produced by chemical replacement of a copper film deposited on the alloy and its structure was studied by X-ray absorption spectroscopy. The residual copper layer remaining on the alloy surface after palladium deposition was mainly composed of metallic nanometric particles. Ex situ X-ray absorption near-edge structure (XANES) at the Ni K edge indicated that the Pd/Cu layer may protect the Ni atoms against corrosion during the charge/discharge cycles. XANES also indicates that the palladium layer presents the same unit cell characteristics of the bulk Pd in a foil. The electrode prepared with the coated alloy presented lower charge/discharge overpotentials as well as lower charge transfer resistance as verified by electrochemical impedance spectroscopy. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：215 / 222

页数：8

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