Oxygen reduction and oxygen evolution reaction activity on Co/Pt(111) surfaces in alkaline solution

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigated the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity of Co and Pt bimetallic systems (n-monolayer (ML)-Co/Pt(l 11); n = 0.13-2.0) in 0.1 M KOH. For the ORR, the 0.25ML-Co/Pt(lll) substrate showed the greatest activity enhancement: 1.7 times of that of clean Pt(l 11). The ORR activity enhancements were sensitive for the submonolayer-thick Co: the 0.25ML-Co/Pt(lll) showed highest activity (1.7-fold vs. Clean Pt(lll)) and the activity steeply decreased above the Co thickness of 0.5 ML. For the OER, the activity increased with an increasing Co thickness and the 2ML-Co/Pt( 111) substrate was the most active. This study suggests that the tuning of the near-surface nanostructures (e.g., Pt-Co composition ratio and chemical state of the Co-(hydro)oxide) is important for achieving high ORR and OER activity in Pt-3d-transition-metal alloy electrocatalysts under alkaline conditions.

Original languageEnglish
Title of host publicationECS Transactions
EditorsD.J. Jones, H. Gasteiger, H. Uchida, T.J. Schmidt, F. Buechi, K.E. Swider-Lyons, B.S. Pivovar, P.N. Pintauro, V.K. Ramani, J.M. Fenton, P. Strasser, K.E. Ayers, A.Z. Weber, T.F. Fuller, R.A. Mantz, H. Xu, C. Coutanceau, S. Mitsushima, S. Narayan, P. Shirvanian, Y.-T. Kim, Y. Gochi-Ponce
PublisherElectrochemical Society Inc.
Pages569-574
Number of pages6
Edition13
ISBN (Electronic)9781607688600
ISBN (Print)9781510871731
DOIs
Publication statusPublished - 2018
EventSymposium on Polymer Electrolyte Fuel Cells and Electrolyzers 18, PEFC and E 2018 - AiMES 2018, ECS and SMEQ Joint International Meeting - Cancun, Mexico
Duration: 2018 Sep 302018 Oct 4

Publication series

NameECS Transactions
Number13
Volume86
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Other

OtherSymposium on Polymer Electrolyte Fuel Cells and Electrolyzers 18, PEFC and E 2018 - AiMES 2018, ECS and SMEQ Joint International Meeting
Country/TerritoryMexico
CityCancun
Period18/9/3018/10/4

ASJC Scopus subject areas

  • Engineering(all)

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