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Electronic Materials Letters , vol. 4, no. 2, pp.75-77, June, 2008
DOI :
Formation of Nanoporous Pt Thin Films by Electrochemical Dissolution
Chunjoong Kim, Yejun Park, Changwoo Nahm, and Byungwoo Park*
Seoul National University
Abstract : To study nanoporous formation by electrochemical dissolution, Pt0.52Al0.48 thin films were examined during 500 repeated cycles. Although the Pt0.52Al0.48 thin films exhibited similar electrocatalytic properties to Pt thin films at the initial stages, the Pt0.52Al0.48 thin films showed gradually increasing electrocatalytic properties as cycles proceeded. These enhancements are attributed to the nanoporosities in the Pt0.52Al0.48 thin films. The nanoporous Pt thin films, after the complete dissolution of Al, exhibited approximately one order of magnitude larger electrochemical surface area than Pt thin films. Superior methanol-oxidation activities were also observed in the nanoporous Pt thin films.
Keyword :
nanostructures, nanoporosity, dissolution, platinum
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