Bismuth Substituted Strontium Cobalt Perovskites for Catalyzing Oxygen Evolution
Name
BiSrCo_manuscript.pdf
Description
Submitted version
Size
1.42 MB
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Checksum (MD5)
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Author(s)
Kuznetsov, Denis A
Peng, Jiayu
Giordano, Livia
Roman-Leshkov, Yuriy
Shao-Horn, Yang
Date Issued
2020
Journal
Journal of Physical Chemistry C
Publisher
American Chemical Society (ACS)
Version
Original manuscript
Abstract
© 2020 American Chemical Society. In this study, we employ the concept of inductive effect through substitution with more electronegative/Lewis acidic A-site ions in the cobalt perovskites to alter the O 2p band center and surface hydroxide affinity to promote oxygen evolution reaction (OER) activity and high stability in the basic electrolyte. Galvanostatically charged (fully oxidized, δ≈ 0) Bi0.2Sr0.8CoO3-δ was shown to exhibit record OER specific activity exceeding not only LaxSr1-xCoO3-δ but also oxidized SrCoO3-δ, one of the most active oxide OER catalysts reported so far. The enhanced OER kinetics of the oxidized Bi0.2Sr0.8CoO3-δ is attributed to greater hydroxide affinity facilitating the deprotonation of surface bound intermediates due to the presence of strong Lewis acidic A-site Bi3+ ions. In addition, no amorphization or compositional change was observed for the surface of the fully oxidized Bi0.2Sr0.8CoO3-δ after OER, where high structural stability is attributed to the higher Fermi level relative to the O 2p band center of Bi0.2Sr0.8CoO3-δ than that of SrCoO3-δ as evidenced by density functional theory (DFT) calculations. This work provides a novel example in the design of highly active oxide catalysts for OER by leveraging the inductive effect.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Electrochemical Energy Laboratory
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Chemical Engineering
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DOI of Published Version
https://doi.org/10.1021/ACS.JPCC.0C01401
