Bismuth Substituted Strontium Cobalt Perovskites for Catalyzing Oxygen Evolution

11 July 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


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.


inductive effect
metal substitution
transition metal oxides
energy conversion
oxygen evolution reaction (OER)

Supplementary materials



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