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X-ray Photoelectron Spectroscopic Investigation of of Plasma-Enhanced Chemical Vapor Deposited NiOx, NiOx(OH)y and CoNiOx(OH)y: Influence of the Chemical Composition on the Catalytic Activity for the Oxygen Evolution Reaction

Weidler, Natascha and Schuch, Jona and Knaus, Florian and Stenner, Patrick and Hoch, Sascha and Maljusch, Artjom and Schaefer, Rolf and Kaiser, Bernhard and Jaegermann, Wolfram (2017):
X-ray Photoelectron Spectroscopic Investigation of of Plasma-Enhanced Chemical Vapor Deposited NiOx, NiOx(OH)y and CoNiOx(OH)y: Influence of the Chemical Composition on the Catalytic Activity for the Oxygen Evolution Reaction.
In: The Journal of Physical Chemistry C, ACS Publications, pp. 6455-6463, 121, (12), ISSN 1932-7447, [Online-Edition: http://doi.org/10.1021/acs.jpcc.6b12652],
[Article]

Abstract

We report here the plasma-enhanced chemical vapor deposition and electrocatalytic characterization of pure NiOx and NiOx(OH)y. Whereas NiOx is deposited if oxygen is used as a reactive gas, the use of air as a reactive gas leads to the deposition of the NiOx(OH)y, which is electrochemically more active than the NiOx. By recording X-ray photoelectron spectra from the as-deposited catalysts and after their electrochemical investigations, we determined that the electrochemical activity correlates with the amount of hydroxide sites on the surface. Such a behavior was already observed for CoOx and CoOx(OH)y. As a consequence, CoNiOx(OH)y was deposited using air as a reactive gas to study the influence of nickel on the electronic structure of CoOx(OH)y and its effect on the electrochemical activity.

Item Type: Article
Erschienen: 2017
Creators: Weidler, Natascha and Schuch, Jona and Knaus, Florian and Stenner, Patrick and Hoch, Sascha and Maljusch, Artjom and Schaefer, Rolf and Kaiser, Bernhard and Jaegermann, Wolfram
Title: X-ray Photoelectron Spectroscopic Investigation of of Plasma-Enhanced Chemical Vapor Deposited NiOx, NiOx(OH)y and CoNiOx(OH)y: Influence of the Chemical Composition on the Catalytic Activity for the Oxygen Evolution Reaction
Language: English
Abstract:

We report here the plasma-enhanced chemical vapor deposition and electrocatalytic characterization of pure NiOx and NiOx(OH)y. Whereas NiOx is deposited if oxygen is used as a reactive gas, the use of air as a reactive gas leads to the deposition of the NiOx(OH)y, which is electrochemically more active than the NiOx. By recording X-ray photoelectron spectra from the as-deposited catalysts and after their electrochemical investigations, we determined that the electrochemical activity correlates with the amount of hydroxide sites on the surface. Such a behavior was already observed for CoOx and CoOx(OH)y. As a consequence, CoNiOx(OH)y was deposited using air as a reactive gas to study the influence of nickel on the electronic structure of CoOx(OH)y and its effect on the electrochemical activity.

Journal or Publication Title: The Journal of Physical Chemistry C
Volume: 121
Number: 12
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Surface Science
07 Department of Chemistry
07 Department of Chemistry > Computational Physical Chemistry
Date Deposited: 19 Mar 2017 12:32
Official URL: http://doi.org/10.1021/acs.jpcc.6b12652
Identification Number: doi:10.1021/acs.jpcc.6b12652
Funders: The authors thanks Evonik for the financial support., Part of this work was financed by the German federal Ministry of Education and Research within the Project SusHy and by the Graduate School of Excellence Energy Science and Engineering.
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