Affiliation:
1. KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia
2. Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
3. School of Chemistry, CRANN and AMBER Research Centres Trinity College Dublin College Green Dublin Ireland
Abstract
AbstractIn alkaline water electrolysis and anion exchange membrane water electrolysis technologies, the hydrogen evolution reaction (HER) at the cathode is significantly constrained by a high energy barrier during the water dissociation step. This study employs a phase engineering strategy to construct heterostructures composed of crystalline Ni4W and amorphous WOx aiming to enhance catalytic performance in the HER under alkaline conditions. This work systematically modulates the oxidation states of W within the amorphous WOx of the heterostructure to adjust the electronic states of the phase boundary, the energy barriers associated with the water dissociation step, and the adsorption/desorption properties of intermediates during the alkaline HER process. The optimized catalyst, Ni4W/WOx‐2, with a quasi‐metallic state of W coordinated by a low oxygen content in amorphous WOx, demonstrates exceptional catalytic performance (22 mV@10 mA cm−2), outperforming commercial Pt/C (30 mV@10 mA cm−2). Furthermore, the operando X‐ray absorption spectroscopy analysis and theoretical calculations reveal that the optimized W atoms in amorphous WOx serve as active sites for water dissociation and the nearby Ni atoms in crystalline Ni4W facilitated the release of H2. These findings provide valuable insights into designing efficient heterostructured materials for energy conversion.
Funder
King Abdullah University of Science and Technology
Cited by
1 articles.
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