Citation: Wenjie Jiang, Zhixiang Zhai, Xiaoyan Zhuo, Jia Wu, Boyao Feng, Tianqi Yu, Huan Wen, Shibin Yin. Revealing the reactant adsorption role of high-valence WO3 for boosting urea-assisted water splitting[J]. Chinese Journal of Structural Chemistry, ;2025, 44(3): 100519. doi: 10.1016/j.cjsc.2025.100519 shu

Revealing the reactant adsorption role of high-valence WO3 for boosting urea-assisted water splitting

Ni-based electrocatalysts are considered a promising choice for urea-assisted hydrogen production. However, its application remains challenging owing to the high occupancy of d orbital at the Ni site, which suppresses the reactant adsorption to achieve satisfactory urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) activity. Herein, the WO3 site with empty d orbital is introduced into Ni3S2 to construct dual active sites for regulating the adsorption of reactive molecules. Experimental and theoretical calculations indicate that the electron transfer from Ni3S2 to WO3 forms electron-deficient Ni with sufficient empty d orbitals for optimizing urea/H2O adsorption and tuning the adsorption behavior of the amino and carbonyl groups in urea. Consequently, the Ni3S2-WO3/NF presents a remarkably low potential of 1.38 V to reach 10 mA cm-2 for UOR-assisted HER. This work highlights the significance of constructing synergistic dual active sites toward developing advanced catalysts for urea-assisted hydrogen production.
- Ni3S2-WO3 nanowires,
- Dual active sites,
- Urea oxidation reaction,
- Hydrogen evolution reaction,
- Overall urea oxidation
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