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  Exceptionally Robust Face-Sharing Motifs Enable Efficient and Durable Water Oxidation

Guan, D., Zhang, K., Hu, Z., Wu, X., Chen, J.-L., Pao, C.-W., et al. (2021). Exceptionally Robust Face-Sharing Motifs Enable Efficient and Durable Water Oxidation. Advanced Materials, (33): 2103392, pp. 1-12. doi:10.1002/adma.202103392.

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 Creators:
Guan, Daqin1, Author
Zhang, Kaifeng1, Author
Hu, Zhiwei2, Author              
Wu, Xinhao1, Author
Chen, Jeng-Lung1, Author
Pao, Chih-Wen1, Author
Guo, Yanan1, Author
Zhou, Wei1, Author
Shao, Zongping1, Author
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1External Organizations, ou_persistent22              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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 Abstract: Corner-sharing oxides usually suffer from structural reconstruction during the bottleneck oxygen-evolution reaction (OER) in water electrolysis. Therefore, introducing dynamically stable active sites in an alternative structure is urgent but challenging. Here, 1D 5H-polytype Ba5Bi0.25Co3.75FeO14-delta oxide with face-sharing motifs is identified as a highly active and stable candidate for alkaline OER. Benefiting from the stable face-sharing motifs with three couples of combined bonds, Ba5Bi0.25Co3.75FeO14-delta can maintain its local structures even under high OER potentials as evidenced by fast operando spectroscopy, contributing to a negligible performance degradation over 110 h. Besides, the higher Co valence and smaller orbital bandgap in Ba5Bi0.25Co3.75FeO14-delta endow it with a much better electron transport ability than its corner-sharing counterpart, leading to a distinctly reduced overpotential of 308 mV at 10 mA cm(-2) in 0.1 m KOH. Further mechanism studies show that the short distance between lattice-oxygen sites in face-sharing Ba5Bi0.25Co3.75FeO14-delta can accelerate the deprotonation step (*OOH + OH- = *OO + H2O + e(-)) via a steric inductive effect to promote lattice-oxygen participation. In this work, not only is a new 1D face-sharing oxide with impressive OER performance discovered, but also a rational design of dynamic stable and active sites for sustainable energy systems is inaugurated.

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Language(s): eng - English
 Dates: 2021-08-262021-08-26
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000688529200001
DOI: 10.1002/adma.202103392
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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: (33) Sequence Number: 2103392 Start / End Page: 1 - 12 Identifier: ISSN: 0935-9648
CoNE: https://pure.mpg.de/cone/journals/resource/954925570855