Efficient alkaline water electrolysis at high current densities via designing the metals-doped nickel sulfide nanorod arrays

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Authors

Quoc-Nam Ha¹ , Dong-Hau Kuo¹

1. National Taiwan University of Science and Technology

Conference / event

Taiwan International Conference on Catalysis 2024 (TICC 2024), June 2024 (Taipei, Taiwan)

Poster summary

A novel bifunctional electrocatalyst constituted as the Li, V co-doped nickel sulfide (Ni3S2) nanorod arrays (LVN-0.1) is designed and investigated to take currently challenges of water-splitting. The overall water splitting constructed with our LVN-0.1 catalyst exhibited low cell voltages of 1.44 and 1.95 V to achieve 10 and 1000 mA/cm2, respectively, with excellent durability, which is almost the best Ni3S2-based electrocatalyst reported to date. The practical scale-up LVN-0.1 stack-cell of 2 × 2 cm2 required 1.92 and 2.02 V to achieve high current densities at the industrial level at 500 and 1000 mA/cm2, respectively. Notably, our alkaline stack-cell achieved a cell-efficiency of 61.9% and cell stability for 200 h at 1000 mA/cm2, while commercial alkaline cells have kept operating below 500 mA/cm2 to avoid the drop-off of binder-coated electrocatalysts. This study provides a facile way to design bifunctional electrocatalysts for realizing high efficient and stable hydrogen production by alkaline water-splitting.

Keywords

Green hydrogen, Ultralow potential, Bifunctional electrocatalyst, Large current density, Ni3S2, Stack cell

Research areas

Chemical Engineering, Material Sciences, Nanoengineering, Energy Engineering

References

1. Ha, Q.N., Gultom, N.S., Yeh, C.H. and Kuo, D.H., 2023. One-pot synthesized Li, V co-doped Ni3S2 nanorod arrays as a bifunctional electrocatalyst for industrialization-facile hydrogen production via alkaline exchange membrane water electrolysis. Chemical Engineering Journal, 472, p.144931.
2. Ha, Q.N., Gultom, N.S., Silitonga, M.Z., Gemeda, T.N. and Kuo, D.H., 2023. Novel core–shell structure of Ni3S2@ LiMoNiOx (OH) y nanorod arrays toward efficient high-current–density hydrogen evolution reaction. Chemical Engineering Journal, 467, p.143253.
3. Ha, Q.N., Yeh, C.H., Gultom, N.S. and Kuo, D.H., 2024. Industrial-scale efficient alkaline water electrolysis achieved with sputtered NiFeV-oxide thin film electrodes for green hydrogen production. Journal of Materials Chemistry A, 12(1), pp.460-474.
4. Ha, Q.N., Hsiao, W.C., Chan, Y.C., Gemeda, T.N., Urgesa, M.H. and Kuo, D.H., 2024. Developing energy-efficient nitrate-to-ammonia flow cells with bifunctional NiFeW-oxide thin-film electrodes made by magnetron sputtering technique. Applied Catalysis B: Environment and Energy, 354, p.124137.

Funding

1. National Science and Technology Council (NCST) (No. MOST-110-2221-E-011-038-MY3)
2. National Science and Technology Council (NCST) (No. MOST 110-2221-E-011-100-MY3)

Supplemental files

1. This work had been published in Chemical Engineering Journal (SCIE, Q1, IF 15.1)   Download

Additional information

Competing interests

No competing interests were disclosed.

Data availability statement

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

Creative Commons license

Copyright © 2024 Ha et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.