Authors
Zhixi Zhang, Peihan Yan, Baojuan Zhang, Chenghai Dai, Sheng Han, Jingshun Zhang, Zhiya Han
Published in
ChemSusChem. Volume 19. Issue 20. Pages e71148. Oct 28, 2026.
Abstract
Electrocatalytic nitrate reduction to ammonia provides a promising strategy for coupling nitrate-polluted wastewater remediation with distributed ammonia production, but achieving high performance with reasonable selectivity and stability remains challenging. Herein, a W-modulated NiFeCoRuW high-entropy alloy catalyst is prepared through microfluidic-assisted liquid-phase reduction followed by high-temperature alloying, with W-free NiFeCoRu as the control. Structural and surface analyses reveal that W incorporation modifies the diffraction features, particle-stacking morphology, and core-level electronic states of the NiFeCoRu matrix, indicating local structural distortion and multimetallic electronic coupling rather than simple compositional addition. Benefiting from the W-containing multimetallic environment and increased electrochemically accessible sites, NiFeCoRuW achieves an NH3 Faradaic efficiency of 98.1% and an NH3 yield rate of 162.65 mg h-1 mg_cat-1 at -0.5 V versus RHE, outperforming reported high-entropy-alloy-based NO3RR catalysts. UV-vis colorimetry and NMR cross-validation support reliable ammonia quantification. In situ DEMS trends and auxiliary free-energy profiles further suggest that W-assisted electronic reconstruction favors nitrate activation and promotes deep reduction involving *NOH/*N-related intermediates while limiting excessive hydrogen-evolution competition.
PMID:
42873675
Bibliographic data and abstract were imported from PubMed on 15 Oct 2026.
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