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Electrochemical Study of Oxygen Reduction on a Carbon‐Supported Core–Shell Platinum–Gold Electrocatalyst with Tuneable Gold Surface Composition
Author(s) -
Mahesh Ijjada,
Sarkar A.
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500452
Subject(s) - electrocatalyst , platinum , electrochemistry , redox , oxygen reduction reaction , catalysis , colloidal gold , inorganic chemistry , materials science , chemistry , chemical engineering , electrode , nanotechnology , nanoparticle , organic chemistry , engineering
The presence of gold on the surface of platinum nanoparticles can have profound effects on the activity in the electrochemical oxygen reduction reaction (ORR). In this work, the ORR activity is studied at different surface coverage of gold on two types of core–shell platinum–gold catalysts. Surface‐limited redox reaction and redox transmetalation methods are used to synthesize core–shell catalysts with varying degrees of gold coverage on their surface. Experimental results indicate that the presence of gold on the surface intrinsically decreases the ORR activity. Furthermore, the effect of the core on the activity for ORR has been studied.