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  Monoclinic SrIrO3: An Easily Synthesized Conductive Perovskite Oxide with Outstanding Performance for Overall Water Splitting in Alkaline Solution

Yu, J., Wu, X., Guan, D., Hu, Z., Weng, S.-C., Sun, H., et al. (2020). Monoclinic SrIrO3: An Easily Synthesized Conductive Perovskite Oxide with Outstanding Performance for Overall Water Splitting in Alkaline Solution. Chemistry of Materials, 32(11), 4509-4517. doi:10.1021/acs.chemmater.0c00149.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-89DA-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-89E2-0
Genre: Journal Article

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 Creators:
Yu, Jie1, Author
Wu, Xinhao1, Author
Guan, Daqin1, Author
Hu, Zhiwei2, Author              
Weng, Shih-Chang1, Author
Sun, Hainan1, Author
Song, Yufei1, Author
Ran, Ran1, Author
Zhou, Wei1, Author
Ni, Meng1, Author
Shao, Zongping1, 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: Fabricating efficient bifunctional catalysts for both hydrogen/oxygen evolution reactions (HER/OER) in an easy and mass-productive way is highly attractive for alkaline water electrolyzers. Perovskite oxides show compositional flexibility and high property tunability, while poor electrical conductivity and relatively low HER activity hamper their application in overall water splitting. Here, a conductive monoclinic SrIrO3 perovskite is developed as an excellent alkaline electrocatalyst with bifunctionality which can be easily synthesized under normal conditions. Toward the HER, it experiences progressive surface self-reconstruction during the activation process because of lattice Sr2+ leaching, eventually leading to a remarkable apparent activity with an approximately 11-fold enhancement at 200 mV overpotential relative to the fresh sample. Experimental and theoretical evidence reveals that etching of lattice Sr2+ in relatively less-stable SrIrO3 compared to IrO2 is crucial for triggering this self-reconstruction. Toward the OER, no obvious surface reconstruction occurs, and an overpotential of only 300 mV is required to realize 10 mA cmgeo -2, significantly lower than that for most perovskites reported previously (340-450 mV). The activated SrIrO3 from HER operation can be used alternatively as an OER electrocatalyst with further improved performance. A SrIrO3-based two-electrode water-splitting cell shows exceptional performance, that is, 1.59 V@10 mA cmgeo -2 with negligible performance degradation over 10 h. © 2020 American Chemical Society.

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Language(s): eng - English
 Dates: 2020-05-082020-05-08
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1021/acs.chemmater.0c00149
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Title: Chemistry of Materials
  Abbreviation : Chem. Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 32 (11) Sequence Number: - Start / End Page: 4509 - 4517 Identifier: ISSN: 0897-4756
CoNE: https://pure.mpg.de/cone/journals/resource/954925561571