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説明:

The CoSn(OH)6 perovskite hydroxide is a structure stable and inexpensive electrocatalyst for the oxygen evolution reaction (OER). However, the OER activity of CoSn(OH)6 is still unfavorable due to its limited active sites. In this work, an Fe3+ doping strategy is used to optimize the d-band state of the CoSn(OH)6 perovskite hydroxide. The CoSn(OH)6 catalyst with slightly Fe3+ doped nanocubes is synthesized by a facile hydrothermal method. Structure characterization shows that Fe3+ ions are incorporated into the crystal structure of CoSn(OH)6. Owing to the regulation of the electronic structure, CoSn(OH)6-Fe1.8% exhibits an OER overpotential of 289 mV at a current density of 10 mA cm−2 in OER electrochemical tests. In situ Raman spectroscopy shows that no obvious re-construction occurred during the OER for both CoSn(OH)6 and CoSn(OH)6-Fe1.8%. DFT calculations show that the introduction of Fe3+ into CoSn(OH)6 can shift the d-band center to a relatively high position, thus promoting the OER intermediates’ adsorption ability. Further DFT calculations suggest that incorporation of an appropriate amount of Fe3+ into CoSn(OH)6 significantly reduces the rate-determining Gibbs free energy during the OER. This work offers valuable insights into tuning the d-band center of perovskite hydroxide materials for efficient OER applications.

権利情報:

• In Copyright
  

キーワード: Metal hydroxide, Electrocatalysis, Oxygen evolution reaction

刊行年月日: 2024-05-02

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Nanoscale (ISSN: 20403364) vol. 16 issue. 22 p. 10618-10627

研究助成金:

• Central South University
• National Natural Science Foundation of China 22072183
• Natural Science Foundation of Hunan Province 2022JJ30690
• Natural Science Foundation of Hunan Province 2024JJ5378

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4535

公開URL: https://doi.org/10.1039/d4nr00975d

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更新時刻: 2025-05-02 08:30:18 +0900

MDRでの公開時刻: 2025-05-02 08:19:54 +0900