Citation: Miaosen Yang, Junyang Ding, Zhiwei Wang, Jingwen Zhang, Zimo Peng, Xijun Liu. NiMo-based alloy and its sulfides for energy-saving hydrogen production via sulfion oxidation assisted alkaline seawater splitting[J]. Chinese Chemical Letters, ;2025, 36(9): 110861. doi: 10.1016/j.cclet.2025.110861 shu

NiMo-based alloy and its sulfides for energy-saving hydrogen production via sulfion oxidation assisted alkaline seawater splitting

Miaosen Yang ^{a, b, 1} ,
Junyang Ding ^{c, 1} ,
Zhiwei Wang ^c ,
Jingwen Zhang ^c ,
Zimo Peng ^c ,
Xijun Liu ^{c, *,}

a.
School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China
b.
Nanchang Institute of Technology, Nanchang 330044, China
c.
Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China

xjliu@gxu.edu.cn

Received Date: 10 December 2024
Revised Date: 2 January 2025
Accepted Date: 14 January 2025
Available Online: 15 January 2025

Figures(6)

Establishing an energy-saving and affordable hydrogen production route from infinite seawater presents a promising strategy for achieving carbon neutrality and low-carbon development. Compared with the kinetically sluggish oxygen evolution reaction (OER), the thermodynamically advantageous sulfion oxidation reaction (SOR) enables the S^2- pollutants recovery while reducing the energy input of water electrolysis. Here, a nanoporous NiMo alloy ligament (np-NiMo) with AlNi₃/Al₅Mo heterostructure was prepared for hydrogen evolution reaction (HER, -0.134 V versus reversible hydrogen electrode (vs. RHE) at 50 mA/cm²), which needs an Al₈₉Ni₁₀Mo₁ as a precursor and dealloying operation. Further, the np-NiMo alloy was thermal-treated with S powder to generate Mo-doped NiS₂ (np-NiMo-S) for OER (1.544 V vs. RHE at 50 mA/cm²) and SOR (0.364 V vs. RHE at 50 mA/cm²), while still maintaining the nanostructuring advantages. Moreover, for a two-electrode electrolyzer system with np-NiMo cathode (1 M KOH + seawater) coupling np-NiMo-S anode (1 mol/L KOH + seawater + 1 mol/L Na₂S), a remarkably ultra-low cell potential of 0.532 V is acquired at 50 mA/cm², which is about 1.015 V below that of normal alkaline seawater splitting. The theory calculations confirmed that the AlNi₃/Al₅Mo heterostructure within np-NiMo promotes H₂O dissociation for excellent HER, while the Mo-dopant of np-NiMo-S lowers energy barriers for the rate-determining step from ^*S₄ to ^*S₈. This work develops two kinds of NiMo alloy with tremendous prominence for achieving energy-efficient hydrogen production from alkaline seawater and sulfur recycling from sulfion-rich sewage.
- NiMo alloy,
- Alkaline seawater electrolysis,
- Hydrogen production,
- Sulfion oxidation reaction,
- Theoretical calculation
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