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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 2, 2025
Revised July 13, 2025
Accepted July 17, 2025
Available online December 25, 2025

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Enhanced Hydrogen Evolution Reaction Kinetics by Sulfur Incorporation in Transition Metal‑Based Oxyhydroxide Electrodes

Jun Seok Ha¹ Seung Hun Lee Sung Jun Lee² In Tae Kim² Seo Hyun Park² Woo Jae Lee³ Kyeong‑Ho Kim⁴ Geon Hwee Kim⁵ Jooyoung Lee¹ Yangdo Kim Sung Mook Choi^{1 6} Yoo Sei Park^{7 8†}

Department of Materials Science and Engineering, Pusan National University ¹Department of Energy and Environment Materials Research Division, Korea Institute of Materials Science (KIMS) ²Department of Urban, Energy, and Environmental Engineering, Chungbuk National University ³Division of Nanotechnology and Semiconductor Engineering, Pukyong National University ⁴Department of Materials Science and Engineering, Pukyong National University ⁵Department of Mechanical Engineering, Chungbuk National University ⁶Advanced Materials Engineering, University of Science and Technology (UST) ⁷Department of Nanoenergy Engineering, Pusan National University ⁸Department of Nano Fusion Technology, Pusan National University

yoosei@pusan.ac.kr

Korean Journal of Chemical Engineering, December 2025, 42(14), 3379-3385(7)
https://doi.org/10.1007/s11814-025-00526-w

Abstract

Hydrogen, with its high energy density and sustainability, is a promising energy carrier, and water electrolysis provides an

efficient, carbon-free method for its production. To achieve cost-effective hydrogen production, the development of transition

metal-based HER catalysts is crucial. In this study, sulfur-doped NiFeCo oxyhydroxide (S-NiFeCo/NF) was synthesized

via galvanic corrosion and hydrothermal methods to enhance HER activity. Sulfur incorporation modulated the electronic

structure, lowering the onset potential ( − 115 mV at − 10 mA/cm2) and activation barrier (56 kJ/mol). S-NiFeCo/NF also

demonstrated excellent durability, 0.13 mV/h degradation of its initial activity after 400 h at – 100 mA/cm2, highlighting

sulfur doping as an effective strategy for non-precious HER electrocatalysts.

Keywords

Electrocatalysts · Hydrogen energy · Hydrogen evolution reaction · Water splitting · Water electrolysis