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  Facile Protocol for Alkaline Electrolyte Purification and Its Influence on a Ni–Co Oxide Catalyst for the Oxygen Evolution Reaction

Spanos, I., Tesch, M. F., Yu, M., Tüysüz, H., Zhang, J., Feng, X., et al. (2019). Facile Protocol for Alkaline Electrolyte Purification and Its Influence on a Ni–Co Oxide Catalyst for the Oxygen Evolution Reaction. ACS Catalysis, 9(9), 8165-8170. doi:10.1021/acscatal.9b01940.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-9433-B Version Permalink: http://hdl.handle.net/21.11116/0000-0004-D502-9
Genre: Journal Article

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 Creators:
Spanos, Ioannis1, Author              
Tesch, Marc F.1, Author
Yu, Mingquan2, Author              
Tüysüz, Harun2, Author              
Zhang, Jian3, Author
Feng, Xinliang3, Author
Müllen, Klaus4, Author              
Schlögl, Robert1, Author              
Mechler, Anna Katharina1, Author              
Affiliations:
1Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society, ou_3023874              
2Research Group Tüysüz, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950290              
3Department of Chemistry and Food Chemistry, Center for Advancing Electronics, Zellescher Weg 19, 01069 Dresden, Germany, ou_persistent22              
4Dept. Müllen: Synthetic Chemistry, MPI for Polymer Research, Max Planck Society, ou_1800289              

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Free keywords: oxygen revolution reaction; electrocatalysis; Fe impurities; KOH purification; ICP-OES
 Abstract: We report a simple and effective electrochemical method to remove Fe impurities from commercial KOH electrolyte. We therefore utilize a MoS2 catalyst deposited on porous Ni foam as both the anode and cathode in a two-electrode electrolysis setup. After 12 h of constant galvanostatic electrolysis at 100 mA, the Fe impurities from the KOH electrolyte were successfully removed, as confirmed by means of inductively coupled plasma optical emission spectroscopy analysis. In the purified KOH, a Ni–Co3O4 composite oxide catalyst showed no Fe-induced activation. In contrast, we directly observed the uptake of Fe on the Ni–Co3O4 catalyst from the nontreated electrolyte during catalyst operation using a coupled spectroelectrochemical setup. Interestingly, we further identified an influence on the dissolution behavior of Ni and Co in the presence of Fe impurities. Whereas hitherto mainly the activation effect of Fe impurities has been discussed, we hereby show that they additionally suppress corrosion under reaction conditions. Using our fast and low-cost method for the purification of large amounts of electrolyte, catalyst materials can be widely studied without these additional effects induced by Fe impurities in commercial KOH.

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Language(s): eng - English
 Dates: 2019-05-102019-08-06
 Publication Status: Published online
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acscatal.9b01940
 Degree: -

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Title: ACS Catalysis
  Abbreviation : ACS Catal.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington, DC : ACS
Pages: - Volume / Issue: 9 (9) Sequence Number: - Start / End Page: 8165 - 8170 Identifier: ISSN: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435