| Li, Weijie, Ni, Zhenrui, Akdim, Ouardia, Liu, Tao, Zhu, Bicheng, Kuang, Panyong and Yu, Jiaguo 2025. Dual active site engineering in porous NiW bimetallic alloys for enhanced alkaline hydrogen evolution reaction. Advanced Materials , 2503742. 10.1002/adma.202503742 |
Abstract
AbstractUtilizing dual active sites in electrocatalysts creates a synergistic effect, enabling the independent optimization of H2O 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 H2 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−2 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 (εd) of the W 5d orbital downward, which enhances *OH intermediate desorption and promotes H2O adsorption and dissociation at the W site, leading to increased active site availability. Meanwhile, this shift provides more accessible H* intermediates, further enhancing H2 production at the Ni2W1 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 H2 production.
| Item Type: | Article |
|---|---|
| Date Type: | Published Online |
| Status: | In Press |
| Schools: | Schools > Chemistry |
| Additional Information: | License information from Publisher: LICENSE 1: URL: http://onlinelibrary.wiley.com/termsAndConditions#vor, Start Date: 2025-05-09 |
| Publisher: | Wiley |
| ISSN: | 0935-9648 |
| Last Modified: | 03 Jun 2025 11:15 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/178713 |
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