These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
2 files

Bismuth Substituted Strontium Cobalt Perovskites for Catalyzing Oxygen Evolution

submitted on 10.07.2019, 14:07 and posted on 11.07.2019, 13:14 by Denis Kuznetsov, Jiayu Peng, Livia Giordano, Yuriy Román-Leshkov, Yang Shao-Horn
In this study, we employ the strategy of substitution with more electronegative/acidic A-site ions in the cobalt perovskites to alter O 2p-band center, surface hydroxide affinity, and oxygen evolution reaction (OER) activity and stability in the basic electrolyte. Galvanostatically charged Bi0.2Sr0.8CoO3-δ (δ close to zero) was shown to exhibit record OER specific activity exceeding not only LaxSr1-xCoO3-δ but also charged SrCoO3-δ (δ close to zero), one of the most active oxide OER catalysts reported so far. The enhanced OER activity of charged Bi0.2Sr0.8CoO3-δ can be attributed to greater hydroxide affinity facilitating the deprotonation of surface bound intermediates due to the presence of strong Lewis acidic A-site Bi3+ ions, while the high stability can result from lowered O 2p-band center relative to the Fermi level. This work provides a novel example in the rational design of highly active oxide catalysts for OER by leveraging the inductive effect.


Office of Science of the U.S. Department of Energy, contract No. DE-AC02-05CH11231

National Science Foundation, grant number ACI-1548562

National Science Foundation, award number DMR-1419807


Email Address of Submitting Author


ETH Zurich



ORCID For Submitting Author


Declaration of Conflict of Interest

No conflicts to declare.