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

  • Marković, N. M.
  • Widelôv, A.
  • Ross, P. N.
  • Monteiro, O. R.
  • Brown, I. G.

  • 1Material SciencesDivision, Lawrence Berkeley National Laboratory, University ofCalifornia, Berkeley, CA94720, USA

    2Accelerator and Fusion Research Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA94720, USA

*To whom correspondence should be addressed.

Catalysis Letters 43(4):p 161-166, 1997.

A new type of ion implantation technique is used to create a non-equilibrium Pt-Sn(IMP) near-surface alloy with ca. 8.6 atpercent; 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.

Copyright ©1997 Kluwer Academic Publishers