Lee, Kug-Seung Park, Hee-Young Ham, Hyung Chul Yoo, Sung Jong Kim, Hyoung Juhn Cho, EunAe Manthiram, Arumugam Jang, Jong Hyun 2024-01-20T12:30:45Z 2024-01-20T12:30:45Z 2021-09-05 2013-05-09 1932-7447 https://pubs.kist.re.kr/handle/201004/128064 Reversible surface segregation of Pt in Pt3Au/C catalysts was accomplished through a heat treatment under a CO or Ar atmosphere, which resulted in surface Pt segregation and reversed segregation, respectively. The Pt-segregated Pt3Au/C exhibited a significantly improved oxygen reduction reaction (ORR) activity (227 inA/mg(metal)) compared to that of commercial Pt/C (59 mA/mg(metal)). For the Pt-segregated Pt3Au/C, the increased OH-repulsive properties were validated by a CO bulk oxidation analysis and also by density functional theory (DFT) calculations. Interestingly, the DFT calculations revealed that the binding energy for Pt-segregated Pt3Au (111) surfaces was 0.1 eV lower than that for Pt (111) surfaces, which has been previously reported to exhibit the optimum OH binding energy for the ORB,. Therefore, the reversible surface segregation is expected to provide a practical way to control the surface states of Pt-Au bimetallic catalysts to enhance ORR activity. In addition, the Pt-segregated Pt3Au/C showed excellent electrochemical stability, as evidenced by its high-performance retention (96.4%) after 10 000 potential cycles, in comparison to that of Pt/C (55.3%). English American Chemical Society ALLOY CATHODE CATALYST AU NANOPARTICLES ELECTROCATALYTIC ACTIVITY CO ELECTROOXIDATION AIR BATTERIES PLATINUM MONOLAYER ELECTROCHEMISTRY TRANSITION GOLD Reversible Surface Segregation of Pt in a Pt3Au/C Catalyst and Its Effect on the Oxygen Reduction Reaction Article 10.1021/jp403135k 1 The Journal of Physical Chemistry C, v.117, no.18, pp.9164 - 9170 The Journal of Physical Chemistry C 117 18 9164 9170 scie scopus 000318892000015 2-s2.0-84877723959 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article ALLOY CATHODE CATALYST AU NANOPARTICLES ELECTROCATALYTIC ACTIVITY CO ELECTROOXIDATION AIR BATTERIES PLATINUM MONOLAYER ELECTROCHEMISTRY TRANSITION GOLD PEMFC catalyst Surface segregation oxygen reduction