Dissolution of Ni from High Ni Content Pt1-xNix Alloys.

Authors :: Stevens, D. A.
Mehrotra, R.
Sanderson, R. J.
Vernstrom, G. D.
Atanasoski, R. T.
Debe, M. K.
Dahn, J. R.
Source :: Journal of The Electrochemical Society; 2011, Vol. 158 Issue 8, pB905-B909, 5p
Publication Year :: 2011
Abstract: Three Pt<subscript>1-x</subscript>Ni<subscript>x</subscript> catalyst compositions, with high Ni content, were sputter deposited onto 3M Company's Nano-Structured Thin Film catalyst support to determine whether the high oxygen reduction reaction (ORR) activities recently reported are a surface phenomenon or require bulk Ni dissolution. The electrodes with Pt<subscript>0.27</subscript>Ni<subscript>0.73</subscript> throughout had the highest mass specific ORR activity of the samples tested. When some of the Pt<subscript>0.27</subscript>Ni<subscript>0.73</subscript> was replaced with either Pt or Pt<subscript>0.75</subscript>Ni<subscript>0.25</subscript>, the mass activity dropped. These results confirmed that continuous high Ni content is required to obtain high mass activity. [ABSTRACT FROM AUTHOR]