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  Influence of the Fe:Ni Ratio and Reaction Temperature on the Efficiency of (FexNi1–x)9S8 Electrocatalysts Applied in the Hydrogen Evolution Reaction

Piontek, S., Andronescu, C., Zaichenko, A., Konkena, B., Junge Puring, K., Marler, B., et al. (2018). Influence of the Fe:Ni Ratio and Reaction Temperature on the Efficiency of (FexNi1–x)9S8 Electrocatalysts Applied in the Hydrogen Evolution Reaction. ACS Catalysis, 8(2), 987-996. doi:10.1021/acscatal.7b02617.

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Piontek, Stefan1, Author
Andronescu, Corina2, 3, Author
Zaichenko, Aleksandr4, Author
Konkena, Bharathi2, Author
Junge Puring, Kai1, 5, Author
Marler, Bernd6, Author
Antoni, Hendrik7, Author
Sinev, Ilya8, Author
Muhler, Martin7, Author
Mollenhauer, Doreen4, Author
Roldan Cuenya, Beatriz8, 9, Author           
Schuhmann, Wolfgang2, Author
Apfel, Ulf-Peter1, 5, Author
Affiliations:
1Ruhr-Universität Bochum, Inorganic Chemistry I, Universitätßtraße 150, D-44780 Bochum, Germany, ou_persistent22              
2Ruhr-Universität Bochum, Analytical Chemistry—Center for Electrochemical Sciences (CES), Universitätßtraße 150, D-44780 Bochum, Germany, ou_persistent22              
3University Politehnica of Bucharest, Department of Bioresources and Polymer Science, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania, ou_persistent22              
4Justus-Liebig-Universität Gießen, Institute of Physical Chemistry, Heinrich-Buff-Ring 17, D-35392 Gießen, Germany, ou_persistent22              
5Fraunhofer UMSICHT, Osterfelder Straße 3, D-46047 Oberhausen, Germany, ou_persistent22              
6Ruhr-Universität Bochum, Department of Geology, Mineralogy and Geophysics, Universitätsstraße 150, D-44780 Bochum, Germany, ou_persistent22              
7Ruhr-Universität Bochum, Laboratory of Industrial Chemistry, Universitätßtraße 150, D-44780 Bochum, Germany, ou_persistent22              
8Experimental Physics IV, Ruhr-Universität Bochum, Universitätßtraße 150, D-44780 Bochum, Germany, ou_persistent22              
9Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              

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 Abstract: Inspired by our recent finding that Fe4.5Ni4.5S8 rock is a highly active electrocatalyst for HER, we set out to explore the influence of the Fe:Ni ratio on the performance of the catalyst. We herein describe the synthesis of (FexNi1–x)9S8 (x = 0–1) along with a detailed elemental composition analysis. Furthermore, using linear sweep voltammetry, we show that the increase in the iron or nickel content, respectively, lowers the activity of the electrocatalyst toward HER. Electrochemical surface area analysis (ECSA) clearly indicates the highest amount of active sites for a Fe:Ni ratio of 1:1 on the electrode surface pointing at an altered surface composition of iron and nickel for the other materials. Specific metal–metal interactions seem to be of key importance for the high electrocatalytic HER activity, which is supported by DFT calculations of several surface structures using the surface energy as a descriptor of catalytic activity. In addition, we show that a temperature increase leads to a significant decrease of the overpotential and gain in HER activity. Thus, we showcase the necessity to investigate the material structure, composition and reaction conditions when evaluating electrocatalysts.

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Language(s): eng - English
 Dates: 2017-12-082017-08-042017-12-122018-01-02
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acscatal.7b02617
 Degree: -

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Title: ACS Catalysis
  Abbreviation : ACS Catal.
Source Genre: Journal
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Publ. Info: Washington, DC : ACS
Pages: 10 Volume / Issue: 8 (2) Sequence Number: - Start / End Page: 987 - 996 Identifier: Other: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435