Cr-added nickel sulfides as electrocatalysts for oxygen evolution reaction

Date

2023-04-01

Author

Uygur, Cansu Savaş
Aydınol, Mehmet Kadri

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Ni0.5-xCrxS compounds (x = 0, 0.02, 0.33) as electrocatalysts for oxygen evolution reaction (OER) were synthesized by a microwave-assisted route that provided an increased surface area. It was found that the OER performance of the NiS electrocatalyst was enhanced by chromium addition. Chromium incorporation was evidenced with Rietveld refinement and XPS analysis. Peak position shifts in the XPS spectra and increases in the lattice parameters a and c indicated the Cr incorporation into the NiS structure. Enhanced kinetic properties, stability and OER activities were achieved with chromium addition due to its contribution to the electronic structure. All samples exhibited competitive results with similar studies and demonstrated better OER activities than the benchmark RuO2. Among three samples, 2 at.% Cr containing NiS sample exhibited the lowest overpotential (334 mV), Tafel slope (42 mV dec−1) and charge transfer resistance (6.1 Ω) values leading to an enhanced OER performance.

Subject Keywords

Intrinsic activity, Microwave synthesis, Nickel sulfide, OER electrocatalyst, Tafel slope

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85146913322&origin=inward
https://hdl.handle.net/11511/102179

Journal

Materials Science and Engineering B: Solid-State Materials for Advanced Technology

DOI

https://doi.org/10.1016/j.mseb.2023.116295

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

C. S. Uygur and M. K. Aydınol, “Cr-added nickel sulfides as electrocatalysts for oxygen evolution reaction,” Materials Science and Engineering B: Solid-State Materials for Advanced Technology, vol. 290, pp. 0–0, 2023, Accessed: 00, 2023. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85146913322&origin=inward.