Xiao, Xiao, Kang, Yuhua, Wang, Tuo, Zhao, Hui, Chen, Beibei, Luo, Shuliang, Li, Delin and Pan, Gang ORCID: https://orcid.org/0000-0003-0920-3018 (2025) Sulfur vacancy-rich ultrathin NiCo2Sx nanosheet arrays as a high-performance electrocatalytic reduction catalyst for nitrate to dinitrogen. Journal of Water Process Engineering, 71. p. 107190.

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Abstract

Nitrate (NO3−) electrocatalytic reduction is one of the most promising technologies for solving NO3− pollution in natural water. Nonprecious electrocatalysts with satisfactory cost and stable catalytic performance is essential to NO3− electrocatalytic reduction. Herein, a sulfur vacancy-rich ultrathin NiCo2Sx nanosheet arrays supported on a nickel foam electrode (denoted as U-NiCo2Sx/NF) is synthesized via simply a one-step constant current deposition strategy. The obtained U-NiCo2Sx/NF displays unique ultrathin sulfide nanosheet arrays, providing abundant infiltration space for NO3− transport, rich catalytic active site and enhanced structure stability. As such, the U-NiCo2Sx/NF exhibits outstanding NO3− electrocatalytic reduction performance with a high NO3− removal rate of 90.60 ± 0.16 % at the conduction of 50 mg L−1 initial NO3− concentration (in terms of NO3−-N), 120 min reaction time and 1.0 mA cm−2 working current density. Meanwhile, the N2 is the main final NO3− reduction product with a high N2 selectivity of 98.48 ± 0.29 %. In addition, the U-NiCo2Sx/NF presents excellent chloride ion tolerance (≤5000 mg L−1) and electrochemical stability (20 electrolysis times). The cyclic voltammetry, i-t chronoamperometric and Tafel test further demonstrate the preeminent NO3− electrocatalytic reduction activity of U-NiCo2Sx/NF. This work may enlighten a simple paradigm to design stable and effective nonprecious electrocatalyst for NO3− electrocatalytic reduction.

Item Type:	Article
Status:	Published
DOI:	10.1016/j.jwpe.2025.107190
School/Department:	School of Humanities
URI:	https://ray.yorksj.ac.uk/id/eprint/11636

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