Dual Active Site Engineering in Porous NiW Bimetallic Alloys for Enhanced Alkaline Hydrogen Evolution Reaction.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40348592.
- Also identified by DOI 10.1002/adma.202503742.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Utilizing dual active sites in electrocatalysts creates a synergistic effect, enabling the independent optimization of H<sub>2</sub>O dissociation and intermediate adsorption/desorption, which in turn enhances the efficiency of the hydrogen evolution reaction (HER). Herein, a porous NiW bimetallic alloy electrocatalyst using a dynamic H<sub>2</sub> bubble template (DHBT) strategy is fabricated. This electrocatalyst capitalizes on the synergistic effect of dual active sites, achieving industrial-level current densities of 500 and 1000 mA cm<sup>-2</sup> for HER in 1.0 M KOH, with low overpotentials of 198 and 264 mV, respectively. It also demonstrates excellent stability over a 200 h test. Theoretical studies reveal that alloying Ni with W shifts the d-band center (ε<sub>d</sub>) of the W 5d orbital downward, which enhances *OH intermediate desorption and promotes H<sub>2</sub>O adsorption and dissociation at the W site, leading to increased active site availability. Meanwhile, this shift provides more accessible H* intermediates, further enhancing H<sub>2</sub> production at the Ni<sub>2</sub>W<sub>1</sub> hollow site. When the porous NiW bimetallic alloy electrocatalyst is implemented in a solar-driven water splitting system, it achieves a high solar-to-hydrogen (STH) conversion efficiency of 16.59%. This work underscores the effectiveness of dual active site electrocatalysts for sustainable H<sub>2</sub> production.