Pt-Me (Me = Ir, Ru, Ni) binary alloys as an ammonia oxidation anode

Kazuki Endo, Kyoko Nakamura, Yasushi Katayama, Takashi Miura

研究成果: Article

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Various Pt-Me (Me = Ir, Ru or Ni) binary alloys were prepared on a glassy carbon (GC) substrate by thermal decomposition and compared as the electrocatalyst for ammonia oxidation in KOH solutions. On the solid solutions of Pt1-xIrx (0 ≤ x ≤ 1.0) and Pt 1-xRux (0 ≤ x ≤ 0.6), ammonia oxidation was found to begin at a lower potential (-0.6V versus Ag/AgCl) than on pure Pt by about 0.1V. During potentiostatic oxidation the current density j decreased considerably within about 300 s. The arbitrarily selected j60 (j after 60 s) tended to saturate at a high set potential region probably due to the deactivation by a poison of Nads. The saturated j60 at a high oxidation potential was apparently higher on Pt1-xIr x (x ≤ 0.8) or Pt1-xRux (x ≤ 0.4) than on Pt, which suggested a positive cooperation of Ir and Ru with Pt in the electrocatalysis. On the other hand, Ni added as a solute to Pt contributed to lower j60 with x in Pt1-xNix (0 ≤ x ≤ 0.7) and did not lower the starting potential of ammonia oxidation at all. The reason why Ir and Ru enhance the activity might be explained by their activity at the dehydrogenatation steps of NH3 at a lower potential, at which ammonia oxidation can never start on the surface of pure Pt.

元の言語English
ページ(範囲)2503-2509
ページ数7
ジャーナルElectrochimica Acta
49
発行部数15
DOI
出版物ステータスPublished - 2004 6 30

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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