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Oxygen reduction reaction on electrodeposited PtAu alloy catalysts in the presence of phosphoric acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
45580 46416 2015 8 PDF Available
Title
Oxygen reduction reaction on electrodeposited PtAu alloy catalysts in the presence of phosphoric acid
Abstract

•Phosphate adsorption on Au substrate was investigated by in situ EC-SERS.•Under acidic condition, Au has strong tolerance to phosphate species adsorption.•ORR activities of electrodeposited PtAu alloys were tested in the presence of PA.•PtAu catalysts exhibited better ORR activity than pure Pt in the presence of PA.

We have investigated phosphate adsorption on the Au surface by in situ electrochemical surface-enhanced Raman spectroscopy to assess the possible use of Au-based alloys as catalysts for the oxygen reduction reaction (ORR) in high-temperature proton exchange membrane fuel cells. Compared with its strong adsorption in neutral or basic electrolytes, the adsorption of phosphate species on the Au surface were significantly altered in acidic electrolyte. Thus, PtxAu100-x catalysts of various compositions were prepared by electrodeposition and exhibited better ORR activities than pure Pt in phosphoric acid electrolyte, which can be explained in terms of alloying effects and the different phosphate adsorption behavior.

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Keywords
Phosphate adsorption; Electrochemical surface-enhanced Raman spectroscopy; Platinum–gold alloy catalyst; Oxygen reduction reaction
First Page Preview
Oxygen reduction reaction on electrodeposited PtAu alloy catalysts in the presence of phosphoric acid
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 495–502
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis