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Electrooxidation of CO and CO/H2 mixtures on a Pt-Sn catalyst prepared by an implantation method

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Abstract

A new type of ion implantation technique is used to create a non-equilibrium Pt-Sn(IMP) near-surface alloy with ca. 8.6 at% Sn. The surface composition was determined by low-energy ion-scattering (LEIS). The kinetics of the electrooxidation of CO and 2% CO/H2 mixtures on Pt-Sn(IMP) is essentially identical to that of Pt3Sn(110). The fact that any non-equilibrium composition can be easily prepared by this implantation method opens an interesting practical opportunity to create a new Pt-Sn alloy fuel cell catalyst having an otherwise unobtainable surface composition of Sn. This method also appears to have general utility in alloy catalysis as a means of exploring compositions in thermodynamically unfavorable regions of the bulk phase diagram.

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Authors
  1. N.M. Markovic
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  2. A. Widelôv
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  3. P.N. Ross
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  4. O.R. Monteiro
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  5. I.G. Brown
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Markovic, N., Widelôv, A., Ross, P. et al. Electrooxidation of CO and CO/H2 mixtures on a Pt-Sn catalyst prepared by an implantation method. Catalysis Letters 43, 161–166 (1997). https://doi.org/10.1023/A:1018907110025

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