Journal
ACS CATALYSIS
Volume 6, Issue 2, Pages 1153-1158Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b02432
Keywords
electrocatalysis; oxygen evolution reaction mechanism; perovskite oxides; density functional theory; surface structure
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Funding
- Skoltech-MIT Center for Electrochemical Energy
- MIT-France program
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Rational design of efficient, stable oxygen evolution reaction (OER) catalysts is necessary for widespread adoption of electrochemical energy storage technologies. Achieving this goal requires elucidation of fundamental relationships between surface structure and reaction mechanism. Here we address this issue using ab initio computations to determine the surface structure and OER mechanism for LaNiO3, a perovksite oxide that exhibits high activity but low stability. We find a new OER mechanism in which lattice oxygen participation via reversible formation of surface oxygen vacancies is critical. We show that this mechanism has a lower reaction barrier compared to the generally proposed mechanism, leading to improved agreement with experimental data. Extending the study to La1-xSrxBO3 (B = transition metal), we demonstrate a transition to the lattice oxygen mediated mechanism with decreasing catalyst stability. Our results suggest new approaches for next-generation catalysts design.
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