Optimization of Pt-Ir on carbon fiber paper for the electro-oxidation of ammonia in alkaline media

Bryan K. Boggs, Gerardine G. Botte

Research output: Contribution to journalArticle

83 Scopus citations

Abstract

Plating bath concentrations of Pt(IV) and Ir(III) have been optimized as well as the total catalytic loading of bimetallic Pt-Ir alloy for the electro-oxidation of ammonia in alkaline media at standard conditions. This was accomplished using cyclic voltammetry, scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and statistical optimization tools. Concentrations of Pt(IV) and Ir(III) of the plating bath strongly influence electrode surface atomic compositions of the Pt-Ir alloy directly affecting the electrooxidation behavior of ammonia. Several anode materials were studied using cyclic voltammetry, which demonstrated that Pt-Ir was the most active catalyst for the electro-oxidation of ammonia. Criteria for optimization were minimizing the climatic oxidation overpotential for ammonia and maximizing the exchange current density. Optimized bath composition was found to be 8.844±0.001 g L-1 Pt(IV) and 4.112±0.001 g L-1 Ir(III) based on electrochemical techniques. Physical characterization of the electrodes by SEM indicates that the plating bath concentrations of Pt and Ir influence the growth and deposition behavior of the alloy.

Original languageEnglish
Pages (from-to)5287-5293
Number of pages7
JournalElectrochimica Acta
Volume55
Issue number19
DOIs
StatePublished - Jul 30 2010

Keywords

  • Ammonia oxidation
  • Anode material
  • Hydrogen production
  • Optimization
  • Pt-Ir alloy

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