Journal
CHEMELECTROCHEM
Volume 8, Issue 20, Pages 3863-3874Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202100713
Keywords
pentlandite; water oxidation; metal chalcogenide; electrocatalysis; non-precious metals
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [390677874, EXC-2033]
- European Union [801459]
- Deutsche Forschungsgemeinschaft [AP242/6-1]
- Fraunhofer Internal Programs [Attract 097-602175]
- Fraunhofer Cluster of Excellence CINES
- Projekt DEAL
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This study presents a simple and systematic method for synthesis of pentlandite-like FexNi9-xS8 (x=0-9) nanosized particles using a mechanochemical approach, optimizing the oxygen evolution reaction (OER) performance by altering catalyst composition. Higher nickel content in the structure leads to better catalytic activity, with the pentlandite structure playing a crucial role in activity.
The development of efficient and cost-effective electrocatalytic materials is an important part in scaling up sustainable electrochemical energy devices such as electrolyzers and fuel cells. In particular, the sluggish kinetics of the oxygen evolution reaction (OER) during water splitting renders the need of a catalyst indispensable. However, the development of catalysts is often based on laboratorial trial-and-error approaches and complex synthetic routes. Herein, the facile and systematic synthesis of pentlandite-like FexNi9-xS8 (x=0-9) nanosized particles from its elements with distinct Fe: Ni ratios was achieved using a mechanochemical method. The OER performance is optimized through tailoring the surface properties via altering the catalyst composition. The catalytic activity increases with higher nickel content in the structure, accomplishing an overpotential of 354 and 420 mV for 'Ni9S8' to drive 10 and 100 mA cm(-2), respectively, with high stability. The in-situ formed nickel oxide/hydroxide species concurrent with sulphur depletion from the pentlandite structure upon OER are more active than NiS, inferring the crucial role of the pentlandite structure in activity. The herein reported simple synthetic approach could bring significant progress in the catalyst material development via rationally screening pentlandites with desired properties for modern energy systems.
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