Publication
Title
Water electrolysis on $La_{1-x}Sr_{x}CoO_{3-\delta}$ perovskite electrocatalysts
Author
Abstract
 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 - delta. We attempt to rationalize the high activities of La1 - xSrxCoO3 - delta 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.
Language
English
Source (journal)
Nature communications
Publication
2016
ISSN
2041-1723
Volume/pages
7(2016), 11 p.
Article Reference
11053
ISI
000372721700001
Medium
E-only publicatie
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address