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  Ir–Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111)

Özer, E., Sinev, I., Mingers, A. M., Araujo, J., Kropp, T., Mavrikakis, M., et al. (2018). Ir–Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111). Surfaces, 1(1), 165-186. doi:10.3390/surfaces1010013.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-B29E-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-B706-9
Genre: Journal Article

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2018
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 Creators:
Özer, Ebru1, Author
Sinev, Ilya2, Author              
Mingers, Andrea Maria3, Author              
Araujo, Jorge1, Author
Kropp, Thomas4, Author
Mavrikakis, Manos4, Author
Mayrhofer, Karl Johann Jakob3, Author              
Roldan Cuenya, Beatriz2, Author              
Strasser, Peter1, 5, Author
Affiliations:
1The Electrochemical Energy, Catalysis and Materials Science Laboratory, Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, Berlin 10623, Germany, ou_persistent22              
2Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              
3Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
4University of Wisconsin-Madison, 1415 Engineering Drive, Madison WI 53706, USA, ou_persistent22              
5Ertl Center for Electrochemistry and Catalysis, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea, ou_persistent22              

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 Abstract: The alteration of electrocatalytic surfaces with adatoms lead to structural and electronic modifications promoting adsorption, desorption, and reactive processes. This study explores the potentiostatic electrodeposition process of Ni onto polycrystalline Ir (Irpoly) and assesses the electrocatalytic properties of the resulting bimetallic surfaces. The electrodeposition resulted in bimetallic Ni overlayer (OL) structures and in combination with controlled thermal post-deposition annealing in bimetallic near-surface alloys (NSA). The catalytic oxygen evolution reaction (OER) activity of these two different Ni-modified catalysts is assessed and compared to a pristine, unmodified Irpoly. An overlayer of Ni on Irpoly showed superior performance in both acidic and alkaline milieu. The reductive annealing of the OL produced a NSA of Ni, which demonstrated enhanced stability in an acidic environment. The remarkable activity and stability improvement of Ir by Ni modification makes both systems efficient electrocatalysts for water oxidation. The roughness factor of Irpoly is also reported. With the amount of deposited Ni determined by inductively coupled plasma mass spectrometry (ICP-MS) and a degree of coverage (monolayer) in the dependence of deposition potential is established. The density functional theory (DFT) assisted evaluation of H adsorption on Irpoly enables determination of the preferred Ni deposition sites on the three low-index surfaces (111), (110), and (100).

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Language(s): eng - English
 Dates: 2018-11-262018-12-132018-12-14
 Publication Status: Published online
 Pages: 22
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3390/surfaces1010013
 Degree: -

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Title: Surfaces
  Abbreviation : Surf.
Source Genre: Journal
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Publ. Info: MDPI, St. Alban-Anlage 66, 4052 Basel, Switzerland : Surfaces Editorial
Pages: - Volume / Issue: 1 (1) Sequence Number: - Start / End Page: 165 - 186 Identifier: ISSN: 2571-9637
CoNE: https://pure.mpg.de/cone/journals/resource/2571-9637