Controlled modification of carbon supported platinum electrocatalysts by Mo

Crabb, E. M.; Ravikumar, M. K.; Qian, Y.; Russell, A. E.; Maniguet, S.; Yao, Jun; Thompsett, D.; Hurford, M.; Ball, S. C.

Abstract

A carbon-supported platinum electrocatalyst was modified with molybdenum using surface organometallic chemistry. The catalyst was characterized using transmission electron microscopy, cyclic voltammetry (CV), polarization studies, and in situ fluorescence extended X-ray absorption fine structure (EXAFS) studies. The CV and polarization studies show that CO oxidation starts at low overpotentials, similar to those of a conventially prepared PtCoMo/C electrocatalyst. EXAFS at the Mo K edge recorded at 0.65 V show that the Mo exists as an oxide species associated with the Pt surface with a Mo-O distance of 1.75 Å. At 0.05 V this oxide is reduced with the formation of a metal-metal bond between the Mo and Pt, with a bond distance of 2.63 Å.

• Journal Article Type: Article
• Publication Date: 2002
• Deposit Date: Apr 17, 2021
• Journal: Electrochemical and Solid-State Letters
• Print ISSN: 1099-0062
• Publisher: Electrochemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Issue: 1
• Article Number: A5
• DOI: https://doi.org/10.1149/1.1419703
• Keywords: Physical and Theoretical Chemistry; Electrical and Electronic Engineering; Electrochemistry; General Materials Science; General Chemical Engineering
• Public URL: https://uwe-repository.worktribe.com/output/7268384