Migration of Cobalt Species within Mixed Platinum-Cobalt Oxide Bifunctional Electrocatalysts in Alkaline Electrolytes

Wang, Lei; Zeng, Zhenhua; Ma, Cheng; Xu, Fei; Giroux, Michael; Chi, Miaofang; Greeley, Jeffrey; Wang, Chao

doi:10.1149/2.0061907jes

Title: Migration of Cobalt Species within Mixed Platinum-Cobalt Oxide Bifunctional Electrocatalysts in Alkaline Electrolytes

Journal Article · Sat Mar 16 00:00:00 EDT 2019 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0061907jes· OSTI ID:1530404

Wang, Lei ^[1]; Zeng, Zhenhua ^[2]; Ma, Cheng ^[3]; Xu, Fei ^[1]; Giroux, Michael ^[1]; Chi, Miaofang ^[3]; Greeley, Jeffrey ^[2];

^[1]

Johns Hopkins Univ., Baltimore, MD (United States)
Purdue Univ., West Lafayette, IN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Bifunctional oxygen electrocatalysts have significant potentials for energy storage and conversion applications. Here we report a facile strategy toward bifunctional electrocatalysts by supporting mixed platinum and cobalt oxide nanoparticles on carbon black. The composite electrocatalyst (denoted as Pt+CoO_x/C) is found to exhibit higher oxygen evolution reaction (OER) activity than CoOx/C, but slightly lower oxygen reduction reaction (ORR) activity than Pt/C in alkaline electrolytes. The bifunctional catalytic performance is ascribed to the in situ formation of heterogenous platinum-cobalt (hydro)oxide (Pt-CoO_xH_y) interfaces under the electrochemical reaction conditions. Calculated electrochemical phase (Pourbaix) diagrams suggest that the migration of Co species was driven by the relative stability of Pt-CoO_xH_y interfaces versus bulk (hydroxy)oxides or aqueous ions of cobalt.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: SC0010379; EE0007270; AC02-06CH11357

OSTI ID:: 1530404

Journal Information:: Journal of the Electrochemical Society, Vol. 166, Issue 7; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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