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Elastic strain effects on the catalytic response of Pt and Pd thin films deposited on Pd–Zr metallic glass

Published online by Cambridge University Press:  09 May 2017

Yiyi Yang  and
K. Sharvan Kumar
Yiyi Yang
Affiliation:
School of Engineering, Brown University, Providence 02912, Rhode Island, USA
K. Sharvan Kumar*
Affiliation:
School of Engineering, Brown University, Providence 02912, Rhode Island, USA
*
a) Address all correspondence to this author. e-mail: Sharvan_kumar@brown.edu
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Abstract

In this study, the influence of an externally applied elastic strain on the electrochemical activity of metal film catalysts during the oxygen reduction reaction (ORR) was examined. A novel three-layer specimen, composed of a 10 nm-thick Pt or Pd surface film on a 20 nm-thick Pd70Zr30 metallic glass film that was first deposited on a polymer substrate was used. The intermediate metallic glass layer is instrumental in allowing the top-layer catalytic film to be elastically deformed to a large elastic strain, (up to 2%), enabling a strain effect to be clearly observed. The results consistently show that an applied compressive strain improves the ORR catalytic activity of the Pd and Pt surface layer, while a tensile strain degrades it. These experimental findings are consistent with the prediction of the d-band model, and provide an opportunity to improve the catalytic response during ORR.

Keywords

catalyticthin filmamorphous
Type
Article
Information
Journal of Materials Research , Volume 32 , Issue 14 , 28 July 2017 , pp. 2690 - 2699
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Edward M. Sabolsky

References

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