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  In Situ/Operando Capturing Unusual Ir6+ Facilitating Ultrafast Electrocatalytic Water Oxidation

Li, L. L., Sun, H., Hu, Z., Zhou, J., Huang, Y.-C., Huang, H., et al. (2021). In Situ/Operando Capturing Unusual Ir6+ Facilitating Ultrafast Electrocatalytic Water Oxidation. Advanced Functional Materials, 31(43): 2104746, pp. 1-8. doi:10.1002/adfm.202104746.

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 Creators:
Li, Lili Li1, Author
Sun, Hainan1, Author
Hu, Zhiwei2, Author           
Zhou, Jing1, Author
Huang, Yu-Cheng1, Author
Huang, Haoliang1, Author
Song, Sanzhao1, Author
Pao, Chih-Wen1, Author
Chang, Yu-Chung1, Author
Komarek, Alexander C.3, Author           
Lin, Hong-Ji1, Author
Chen, Chien-Te1, Author
Dong, Chung-Li1, 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              
3Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              

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 Abstract: Identifying real active sites and understanding the mechanism of oxygen evolution reaction (OER) are still a big challenge today for developing efficient electrochemical catalysts in renewable energy technologies. Here, using a combined in situ/operando experiments and theory, the catalytic mechanism of the ordered OER active Co and Ir ions in Sr2CoIrO6-delta is studied, which exhibits an unprecedented low overpotential 210 mV to achieve 10 mA cm(-2), ranking the highest performance among perovskite-based solid-state catalysts. Operando X-ray absorption spectroscopies as a function of applied voltage indicates that Ir4+ ion is gradually converted into extremely high-valence Ir5+/6+, while the part of Co3+ ion is transferred into Co4+ under OER process. Density functional theory calculations explicitly reveal the order Co-O-Ir network as an origin of ultrahigh OER activity. The work opens a promising path to overcome the sluggish kinetics of OER bottleneck for water splitting via proper arrangements of the multi-active sites in catalyst.

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Language(s): eng - English
 Dates: 2021-08-032021-08-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/adfm.202104746
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Title: Advanced Functional Materials
  Abbreviation : Adv. Funct. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH Verlag GmbH
Pages: - Volume / Issue: 31 (43) Sequence Number: 2104746 Start / End Page: 1 - 8 Identifier: ISSN: 1616-301X
CoNE: https://pure.mpg.de/cone/journals/resource/954925596563