Oxygen-vacancy-engineered MoTiO electrode boosting the exceptional catalytic activity for hydrogen evolution
Lu W. Yang W. Zhang H. Jia H. Beissenov R. Ma D. Lang A. Li J. Liu B.
16 June 2025Elsevier Ltd
International Journal of Hydrogen Energy
2025#138423 - 433 pp.
Hydrogen production via water electrolysis has gained prominence due to its distinct advantages. However, the current preparation methods lack a fast, industrial-scale process, and the system suffers from poor stability, making large-scale hydrogen production difficult to achieve. In this paper, we introduce a novel, low-cost preparation method: Plasma electrolytic oxidation (PEO)—a surface treatment approach that has rarely been used in the fabrication of hydrogen evolution reaction (HER) electrodes. By incorporating metal salts into the electrolyte, we were able to prepare corresponding metal oxide coatings after processing. Through the addition of Na2MoO4, a MoO3-containing coating was prepared, which was then further reduced via heat treatment to yield MoOx. It is particularly noteworthy that the TiO2 base coating also underwent a reduction process, which resulted in the formation of a defective TiO2 structure with oxygen vacancies. Following the annealing treatment, this led to the development of a dual oxygen-vacancy structure: MoOx-TiOx. The results showed that the coating structured electrodes exhibited excellent adhesion and a low overpotential of 132 mV at 10 mA/cm2 in a 1 M KOH aqueous solution. This work paves the way for a new approach to fabricate efficient HER electrodes for hydrogen production.
HER , MoOx-TiOx , Oxygen vacancy , Plasma electrolytic oxidation
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School of Materials Science and Engineering, Northeastern University, No. 11, Wenhua Road, Shenyang, 110819, China
Foshan Graduate School of Innovation, Northeastern University, No. 2, Zhihui Road, Shunde District, Foshan, 528300, China
Kazakh-British Technical University, Tole Bi Street 59, Almaty, 050000, Kazakhstan
School of Materials Science and Engineering
Foshan Graduate School of Innovation
Kazakh-British Technical University
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