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  Elucidation of Structure-Activity Correlations in a Nickel Manganese Oxide Oxygen Evolution Reaction Catalyst by Operando Ni L-Edge X-ray Absorption Spectroscopy and 2p3d Resonant Inelastic X-ray Scattering

Al Samarai, M., Hahn, A. W., Beheshti Askari, A., Cui, Y.-T., Yamazoe, K., Miyawaki, J., et al. (2019). Elucidation of Structure-Activity Correlations in a Nickel Manganese Oxide Oxygen Evolution Reaction Catalyst by Operando Ni L-Edge X-ray Absorption Spectroscopy and 2p3d Resonant Inelastic X-ray Scattering. ACS Applied Materials and Interfaces, 11(42), 38595-38605. doi:10.1021/acsami.9b06752.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-A91B-F Version Permalink: http://hdl.handle.net/21.11116/0000-0005-A91C-E
Genre: Journal Article

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 Creators:
Al Samarai, Mustafa1, Author              
Hahn, Anselm W.1, Author              
Beheshti Askari, Abbas1, Author              
Cui, Yi-Tao, Author
Yamazoe, Kosuke, Author
Miyawaki, Jun, Author
Harada, Yoshihisa, Author
Rüdiger, Olaf1, Author              
DeBeer, Serena1, Author              
Affiliations:
1Research Department DeBeer, Max Planck Institute for Chemical Energy Conversion, Max Planck Society, ou_3023871              

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 Abstract: Herein, we report the synthesis and electro-chemical oxygen evolution experiments for a graphene-supported Ni3MnO4 catalyst. The changes that occur at the Ni active sites during the electrocatalyic oxygen evolution reaction (OER) were elucidated by a combination of operando Ni L-edge X-ray absorption spectroscopy (XAS) and Ni 2p3d resonant inelastic X-ray scattering (RIXS). These data are compared to reference measurements on NiO, beta-Ni(OH)(2), beta-NiOOH, and gamma-NiOOH. Through this comparative analysis, we are able to show that under alkaline conditions (0.1 M KOH), the oxides of the Ni3MnO4 catalyst are converted to hydroxides. At the onset of catalysis (1.47 V), the beta-Ni(OH)(2)-like phase is oxidized and converted to a dominantly gamma-NiOOH phase. The present study thus challenges the notion that the beta-NiOOH phase is the active phase in OER and provides further evidence that the gamma-NiOOH phase is catalytically active. The ability to use Ni L-edge XAS and 2p3d RIXS to provide a rational basis for structure-activity correlations is highlighted.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000492802100023
DOI: 10.1021/acsami.9b06752
 Degree: -

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Title: ACS Applied Materials and Interfaces
  Abbreviation : ACS Appl. Mater. Interfaces
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 11 (42) Sequence Number: - Start / End Page: 38595 - 38605 Identifier: ISSN: 1944-8244
CoNE: https://pure.mpg.de/cone/journals/resource/1944-8244