Acid stability and oxygen reduction activity of magnetron-sputtered Pt1-xTax (0 ≤ x ≤ 1) films

被引：28

作者：

Bonakdarpour, A. ^{[1
]}

Loebel, R. ^{[1
]}

Sheng, S. ^{[1
]}

Monchesky, T. L. ^{[1
]}

Dahn, J. R. ^{[1
]}

机构：

[1] Dalhousie Univ, Dept Phys, Halifax, NS B3H 3J5, Canada

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2006年 / 153卷 / 12期

关键词：

D O I：

10.1149/1.2359689

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Pt1-xTax (0 <= x <= 1) thin-film libraries were prepared using combinatorial dc magnetron sputtering on a variety of substrates. For x < 0.5, the materials adopted a face-centered cubic structure and for x > 0.5 a nanocrystalline phase of Pt1-xTax was observed. The bulk composition of the films obtained by electron microprobe before and after treatment in 0.5 M H2SO4 at 80 degrees C showed no detectable dissolution of Ta at any x in Pt1-xTax. X-ray photoelectron spectroscopy of acid-treated samples revealed that for regions with high Ta content (x > 0.5), full oxidation of surface Ta had occurred. The samples, when used as oxygen-reduction electrocatalysts, also showed corrosion stability; however, the addition of Ta significantly lowered the activity towards oxygen reduction reaction for x > 0.1 in Pt1-xTax. (c) 2006 The Electrochemical Society.

引用

页码：A2304 / A2313

页数：10

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