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Formation of nanoporous platinum by selective dissolution of Cu from Cu0.75Pt0.25

Published online by Cambridge University Press:  31 January 2011

D. V. Pugh ,
A. Dursun  and
S. G. Corcoran
D. V. Pugh
Affiliation:
Virginia Polytechnic Institute & State University, Department of Materials Science and Engineering, Blacksburg, Virginia 24061–0286
A. Dursun
Affiliation:
Virginia Polytechnic Institute & State University, Department of Materials Science and Engineering, Blacksburg, Virginia 24061–0286
S. G. Corcoran
Affiliation:
Virginia Polytechnic Institute & State University, Department of Materials Science and Engineering, Blacksburg, Virginia 24061–0286
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Abstract

This paper gives results demonstrating the production of nanoporous platinum through the de-alloying of Cu0.75Pt0.25 alloy in 1 M H2SO4. Both field emission scanning electron microscopy and small angle neutron scattering confirm the presence of porosity with a diameter of approximately 3.4 nm. This is the smallest porosity quantitatively reported from a de-alloying process to date. The small size is attributed to the extremely small values of surface diffusivity expected for Pt at room temperature, effectively eliminating room-temperature coarsening processes. The results also show that larger length scales can be achieved through coarsening at elevated temperatures. The ease of production of porous platinum makes it attractive for possible applications, such as high surface area electrodes for biomedical devices or as catalyst materials.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 1 , January 2003 , pp. 216 - 221
Copyright
Copyright © Materials Research Society 2003

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