Electrocatalytic Performance of Fuel Oxidation by Pt3Ti Nanoparticles
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- 作者：Hideki Abe ; Futoshi Matsumoto ; Laif R. Alden ; Scott C. Warren ; Hé ; ctor D. Abruñ ; a ; Francis J. DiSalvo
- 刊名：Journal of the American Chemical Society
- 出版年：2008
- 出版时间：April 23, 2008
- 年：2008
- 卷：130
- 期：16
- 页码：5452 - 5458
- 全文大小：1012K
- 年卷期：v.130,no.16(April 23, 2008)
- ISSN：1520-5126
文摘
A Pt-based electrocatalyst for direct fuel cells, Pt3Ti, has been prepared in the form of nanoparticles. Pt(1,5-cyclooctadiene)Cl2 and Ti(tetrahydrofuran)2Cl4 are reduced by sodium naphthalide in tetrahydrofuran to form atomically disordered Pt3Ti nanoparticles (FCC-type structure: Fm3̅m; a = 0.39 nm; particle size = 3 
0.4 nm). These atomically disordered Pt3Ti nanoparticles are transformed to larger atomically ordered Pt3Ti nanoparticles (Cu3Au-type structure: Pm3̅m; a = 0.3898 nm; particle size = 37 23 nm) by annealing above 400 °C. Both atomically disordered and ordered Pt3Ti nanoparticles show lower onset potentials for the oxidation of formic acid and methanol than either pure Pt or Pt−Ru nanoparticles. Both atomically disordered and ordered Pt3Ti nanoparticles show a much lower affinity for CO adsorption than either pure Pt or Pt−Ru nanoparticles. Atomically ordered Pt3Ti nanoparticles show higher oxidation current densities for both formic acid and methanol than pure Pt, Pt−Ru, or atomically disordered Pt3Ti nanoparticles. Pt3Ti nanoparticles, in particular the atomically ordered materials, have promise as anode catalysts for direct fuel cells.
0.4 nm). These atomically disordered Pt3Ti nanoparticles are transformed to larger atomically ordered Pt3Ti nanoparticles (Cu3Au-type structure: Pm3̅m; a = 0.3898 nm; particle size = 37 23 nm) by annealing above 400 °C. Both atomically disordered and ordered Pt3Ti nanoparticles show lower onset potentials for the oxidation of formic acid and methanol than either pure Pt or Pt−Ru nanoparticles. Both atomically disordered and ordered Pt3Ti nanoparticles show a much lower affinity for CO adsorption than either pure Pt or Pt−Ru nanoparticles. Atomically ordered Pt3Ti nanoparticles show higher oxidation current densities for both formic acid and methanol than pure Pt, Pt−Ru, or atomically disordered Pt3Ti nanoparticles. Pt3Ti nanoparticles, in particular the atomically ordered materials, have promise as anode catalysts for direct fuel cells.