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Dynamic restructuring of nickel sulfides for electrocatalytic hydrogen evolution reaction. | LitMetric

AI Article Synopsis

  • * This study uses advanced techniques to show that NiS transforms into a mixed phase of NiS and NiO during operation, creating dual active sites at their interface that enhance catalytic efficiency.
  • * Ultimately, this research reveals that the dynamic chemistry of these materials can be optimized through careful control of conditions, resulting in improved catalytic performance for hydrogen evolution.

Article Abstract

Transition metal chalcogenides have been identified as low-cost and efficient electrocatalysts to promote the hydrogen evolution reaction in alkaline media. However, the identification of active sites and the underlying catalytic mechanism remain elusive. In this work, we employ operando X-ray absorption spectroscopy and near-ambient pressure X-ray photoelectron spectroscopy to elucidate that NiS undergoes an in-situ phase transition to an intimately mixed phase of NiS and NiO, generating highly active synergistic dual sites at the NiS/NiO interface. The interfacial Ni is the active site for water dissociation and OH* adsorption while the interfacial S acts as the active site for H* adsorption and H evolution. Accordingly, the in-situ formation of NiS/NiO interfaces enables NiS electrocatalysts to achieve an overpotential of only 95 ± 8 mV at a current density of 10 mA cm. Our work highlighted that the chemistry of transition metal chalcogenides is highly dynamic, and a careful control of the working conditions may lead to the in-situ formation of catalytic species that boost their catalytic performance.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11196257PMC
http://dx.doi.org/10.1038/s41467-024-49015-4DOI Listing

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