Enhancement of oxygen reduction reaction on PtAu nanoparticles via CO induced surface Pt enrichment

Authors
Park, Hee-YoungJeon, Tae-YeolJang, Jong HyunYoo, Sung JongChoi, Kwang-HyunJung, NamgeeChung, Yung-HoonAhn, MinjeCho, Yong-HunLee, Kug-SeungSung, Yung-Eun
Issue Date
2013-01-17
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.129, pp.375 - 381
Abstract
To investigate the enhancement of the oxygen reduction reaction (ORR) activity on a carbon-supported PtAu alloy nanoparticle catalyst, the catalyst was subject to heat treatment at 423 K under a CO or Ar atmosphere. The surface composition was analyzed by XPS and the composition was shown to increase from 66 +/- 2% (PtAu-AP) to 74 +/- 2% ( PtAu-CO) after heat treatment under a CO atmosphere, which was confirmed by electrochemical techniques, while the bulk composition was invariant at 55%. For the oxygen reduction reaction (ORR), the mass activity of PtAu-CO increased by 75.6% (33.2 A/g(pt)) when compared to that of PtAu-AP (18.9 A/g(pt)). Since the increase in EAS was only 15.8%, it was concluded that the specific activity was enhanced by 52.6% due to surface Pt segregation after heat treatment under a CO atmosphere. The enhanced specific activity was attributed to the reduced OH adsorption energy which was characterized by measuring the potential of total zero charge. The weaker OH adsorption was resulted from the higher Pt/Au ratio at the surface layers. (C) 2012 Elsevier B.V. All rights reserved.
Keywords
ZERO TOTAL CHARGE; GOLD-PLATINUM NANOPARTICLES; METHANOL ELECTROOXIDATION; ELECTROCATALYTIC ACTIVITY; STEPPED SURFACES; AU NANOPARTICLES; ALLOY CATALYSTS; WORK FUNCTION; FORMIC-ACID; FUEL-CELLS; ZERO TOTAL CHARGE; GOLD-PLATINUM NANOPARTICLES; METHANOL ELECTROOXIDATION; ELECTROCATALYTIC ACTIVITY; STEPPED SURFACES; AU NANOPARTICLES; ALLOY CATALYSTS; WORK FUNCTION; FORMIC-ACID; FUEL-CELLS; Polymer electrolyte membrane fuel cell; Electrocatalysis; PtAu; Surface segregation; Pt enrichment; Oxygen reduction reaction
ISSN
0926-3373
URI
https://pubs.kist.re.kr/handle/201004/128446
DOI
10.1016/j.apcatb.2012.09.041
Appears in Collections:
KIST Article > 2013
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