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Title: Water electrolysis on La1-xSrxCoO3-δ perovskite electrocatalysts

Here, perovskite oxides are attractive candidates as catalysts for the electrolysis of water in alkaline energy storage and conversion systems. However, the rational design of active catalysts has been hampered by the lack of understanding of the mechanism of water electrolysis on perovskite surfaces. Key parameters that have been overlooked include the role of oxygen vacancies, B–O bond covalency, and redox activity of lattice oxygen species. Here we present a series of cobaltite perovskites where the covalency of the Co–O bond and the concentration of oxygen vacancies are controlled through Sr2+ substitution into La1–xSrxCoO3–δ. We attempt to rationalize the high activities of La1–xSrxCoO3–δ through the electronic structure and participation of lattice oxygen in the mechanism of water electrolysis as revealed through ab initio modelling. Using this approach, we report a material, SrCoO2.7, with a high, room temperature-specific activity and mass activity towards alkaline water electrolysis.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [2] ;  [1] ;  [5]
  1. Univ. of Texas at Austin, Austin, TX (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Skolkovo Institute of Science and Technology, Moscow (Russia); Univ. of Antwerp, Antwerp (Belgium)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Texas at Austin, Austin, TX (United States); Skolkovo Institute of Science and Technology, Moscow (Russia)
Publication Date:
OSTI Identifier:
1261341
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY