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Research Article

Sulfate-assisted Ni/Fe-based electrodes for anion exchange membrane saline splitting

Yujun Han1, Li Shao2, Yuhang Liu1, Guodong Li3, Tongzhou Wang2,4(), Xuerong Zheng2, Jihong Li2,4(), Xiaopeng Han1, Wenbin Hu1, Yida Deng1,2()
School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China
State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou 570228, China
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China
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In this work, we present a novel oxygen-evolution electrode (ultrathin Fe-Ni3S2 nanosheet arrays supported on nickel-iron foam (noted as NiFeS/NIF)) composed of a sulfate-modulated nickel-iron hydroxide as the catalytic active layer and Fe-Ni3S2 as the corrosion-resistant layer. The electrode demonstrates exceptional oxygen evolution activity and stability even at high current densities (e.g., 1000 mA·cm−2). We assembled and tested an anion exchange membrane electrolyzer with NiFeS/NIF as the anode under industrial conditions. The experimental results indicate that the electrolyzer achieved an impressive energy conversion efficiency of 75% ± 0.5%.

Abstract

Saline water electrolysis is an appealing strategy for hydrogen production, attracting more attention in recent years. NiFe-based electrodes exhibit promise as catalysts for saline water electrolysis. Nevertheless, they suffer from the inferior service life of the oxygen evolution reaction (OER). Herein, we report an oxygen-evolution electrode consisting of a sulfate-modulated nickel-iron hydroxide (NiFeOOH) affording as the catalytic active layer and Fe-Ni3S2 as the corrosion-proof layer. The developed electrode only requires overpotentials of 220 and 292 mV to deliver the current density of 10 and 500 mA·cm−2, respectively. More importantly, it presents long-term stability exceeding 140 and 100 h in 1 M KOH at high current densities of 500 and 1000 mA·cm−2, respectively, as well as 120 h for saline water electrolysis at 100 mA·cm−2. Experimental results reveal that the generated sulfate plays an indispensable role in improving stability and corrosion resistance. We assembled and tested an anion exchange membrane electrolyzer with Pt/C and NiFeS/NIF as the cathode and anode, respectively, under industrial conditions. This overall water-splitting electrolyzer achieves an impressive energy conversion efficiency of 75% ± 0.5%. This report offers fresh insights into the design of stable NiFe-based electrodes, which may further promote its practical applications for saline water electrolysis.

Keywords

saline water electrolysisoxygen evolution reactionanode materialwater splitting

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Nano Research
Volume 17 Issue 7,
July 2024
Pages 5985-5995
DOI: 10.1007/s12274-024-6646-x
Cite this article:
Han Y, Shao L, Liu Y, et al. Sulfate-assisted Ni/Fe-based electrodes for anion exchange membrane saline splitting. Nano Research, 2024, 17(7): 5985-5995. https://doi.org/10.1007/s12274-024-6646-x
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