skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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.

Authors:
 [1];  [2];  [3];  [1];  [1];  [3];  [2]; ORCiD logo [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
  2. Purdue Univ., West Lafayette, IN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1530404
Grant/Contract Number:  
SC0010379; EE0007270; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 166; Journal Issue: 7; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Electrocatalysis; cobalt; electrocatalyst; platinum

Citation Formats

Wang, Lei, Zeng, Zhenhua, Ma, Cheng, Xu, Fei, Giroux, Michael, Chi, Miaofang, Greeley, Jeffrey, and Wang, Chao. Migration of Cobalt Species within Mixed Platinum-Cobalt Oxide Bifunctional Electrocatalysts in Alkaline Electrolytes. United States: N. p., 2019. Web. doi:10.1149/2.0061907jes.
Wang, Lei, Zeng, Zhenhua, Ma, Cheng, Xu, Fei, Giroux, Michael, Chi, Miaofang, Greeley, Jeffrey, & Wang, Chao. Migration of Cobalt Species within Mixed Platinum-Cobalt Oxide Bifunctional Electrocatalysts in Alkaline Electrolytes. United States. doi:10.1149/2.0061907jes.
Wang, Lei, Zeng, Zhenhua, Ma, Cheng, Xu, Fei, Giroux, Michael, Chi, Miaofang, Greeley, Jeffrey, and Wang, Chao. Sat . "Migration of Cobalt Species within Mixed Platinum-Cobalt Oxide Bifunctional Electrocatalysts in Alkaline Electrolytes". United States. doi:10.1149/2.0061907jes. https://www.osti.gov/servlets/purl/1530404.
@article{osti_1530404,
title = {Migration of Cobalt Species within Mixed Platinum-Cobalt Oxide Bifunctional Electrocatalysts in Alkaline Electrolytes},
author = {Wang, Lei and Zeng, Zhenhua and Ma, Cheng and Xu, Fei and Giroux, Michael and Chi, Miaofang and Greeley, Jeffrey and Wang, Chao},
abstractNote = {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+CoOx/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-CoOxHy) 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-CoOxHy interfaces versus bulk (hydroxy)oxides or aqueous ions of cobalt.},
doi = {10.1149/2.0061907jes},
journal = {Journal of the Electrochemical Society},
number = 7,
volume = 166,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share:

Works referenced in this record:

Correlation Between Surface Chemistry and Electrocatalytic Properties of Monodisperse PtxNi1-x Nanoparticles
journal, November 2010

  • Wang, Chao; Chi, Miaofang; Wang, Guofeng
  • Advanced Functional Materials, Vol. 21, Issue 1, p. 147-152
  • DOI: 10.1002/adfm.201001138

Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction
journal, August 2011

  • Liang, Yongye; Li, Yanguang; Wang, Hailiang
  • Nature Materials, Vol. 10, Issue 10, p. 780-786
  • DOI: 10.1038/nmat3087

Projector augmented-wave method
journal, December 1994


From ultrasoft pseudopotentials to the projector augmented-wave method
journal, January 1999


Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
journal, July 1996


Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study
journal, January 1998

  • Dudarev, S. L.; Botton, G. A.; Savrasov, S. Y.
  • Physical Review B, Vol. 57, Issue 3, p. 1505-1509
  • DOI: 10.1103/PhysRevB.57.1505