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  Dynamic structural transformation induced by defects in nano-rod FeOOH during electrochemical water splitting

Hu, Y., Zhou, J., Li, L., Hu, Z., Yuan, T., Jing, C., et al. (2021). Dynamic structural transformation induced by defects in nano-rod FeOOH during electrochemical water splitting. Journal of Materials Chemistry A, 1-9. doi:10.1039/d1ta08938b.

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 Creators:
Hu, Yitian1, Author
Zhou, Jing1, Author
Li, Lili1, Author
Hu, Zhiwei2, Author              
Yuan, Taotao1, Author
Jing, Chao1, Author
Liu, Renduo1, Author
Xi, Shibo1, Author
Jiang, Haiqing1, Author
Wang, Jian-Qiang1, Author
Zhang, Linjuan1, Author
Affiliations:
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: Defect engineering is a prevailing strategy for enhancing the oxygen evolution reaction activity for water spitting of electrocatalysts with a single phase or single metal; however, the exact role of defects in the improvement of catalytic activity remains unclear. Although Fe-based catalysts, such as unary FeOOH compounds, suffer from insufficient activity, they are promising catalysts due to their low cost, rich redox properties and low toxicity. In this work, a unique defect-rich nanorod FeOOH catalyst (D-FeOOH) is rationally constructed by simple electron beam irradiation, which enhances the mass activity by 8 times compared with that for pristine FeOOH and achieves the highest rank among unary Fe catalysts reported to date. In situ Raman and hard X-ray absorption spectroscopic studies reveal that defects during the OER activation process can speed up the dynamic reconstruction from single beta-FeOOH to a mixed alpha/beta-FeOOH phase and modulate the ultimate atomic ratio of the mixed phase, which enhances the electrochemical performance. This work provides insight into the defect mechanism in FeOOH by accelerating the dynamic structural evolution during the OER process.

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Language(s): eng - English
 Dates: 2021-11-242021-11-24
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000729522000001
DOI: 10.1039/d1ta08938b
 Degree: -

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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 9 Identifier: ISSN: 2050-7488
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7488