Park, Hee-Young Jeon, Tae-Yeol Jang, Jong Hyun Yoo, Sung Jong Choi, Kwang-Hyun Jung, Namgee Chung, Yung-Hoon Ahn, Minje Cho, Yong-Hun Lee, Kug-Seung Sung, Yung-Eun 2024-01-20T13:03:31Z 2024-01-20T13:03:31Z 2021-09-01 2013-01-17 0926-3373 https://pubs.kist.re.kr/handle/201004/128446 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. English ELSEVIER SCIENCE BV ZERO TOTAL CHARGE GOLD-PLATINUM NANOPARTICLES METHANOL ELECTROOXIDATION ELECTROCATALYTIC ACTIVITY STEPPED SURFACES AU NANOPARTICLES ALLOY CATALYSTS WORK FUNCTION FORMIC-ACID FUEL-CELLS Enhancement of oxygen reduction reaction on PtAu nanoparticles via CO induced surface Pt enrichment Article 10.1016/j.apcatb.2012.09.041 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.129, pp.375 - 381 APPLIED CATALYSIS B-ENVIRONMENTAL 129 375 381 scie scopus 000312689500042 2-s2.0-84867606650 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article 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