Influence of the Fe:Ni Ratio and Reaction Temperature on the Efficiency of (Fex
Ni1–x)9S8 Electrocatalysts Applied in the Hydrogen Evolution Reaction

Piontek, Stefan; Andronescu, Corina; Zaichenko, Aleksandr; Konkena, Bharathi; Junge Puring, Kai; Marler, Bernd; Antoni, Hendrik; Sinev, Ilya; Muhler, Martin; Mollenhauer, Doreen; Roldan Cuenya, Beatriz; Schuhmann, Wolfgang; Apfel, Ulf-Peter

doi:10.1021/acscatal.7b02617

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Influence of the Fe:Ni Ratio and Reaction Temperature on the Efficiency of (Fe_xNi_1–x)₉S₈ Electrocatalysts Applied in the Hydrogen Evolution Reaction

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Roldan Cuenya, Beatriz
Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany;
Interface Science, Fritz Haber Institute, Max Planck Society;

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Citation

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 (Fe_xNi_1–x)₉S₈ Electrocatalysts Applied in the Hydrogen Evolution Reaction. ACS Catalysis, 8(2), 987-996. doi:10.1021/acscatal.7b02617.

Cite as: https://hdl.handle.net/21.11116/0000-0000-B58F-3

Abstract

Inspired by our recent finding that Fe_4.5Ni_4.5S₈ 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 (Fe_xNi_1–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.