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Processes
Volume 13
Issue 8
10.3390/pr13082594
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Rapid Joule-Heating Synthesis of Efficient Low-Crystallinity Ru-Mo Oxide Catalysts for Alkaline Hydrogen Evolution Reaction

by
Tao Shi
1,
Xiaoling Huang
1,
Zhan Zhao
1,
Zizhen Li
1,
Kelei Huang
2 and
Xiangchao Meng
1,*
1
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2
Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, China
*
Author to whom correspondence should be addressed.
Processes 2025, 13(8), 2594; https://doi.org/10.3390/pr13082594 (registering DOI)
Submission received: 25 July 2025 / Revised: 11 August 2025 / Accepted: 14 August 2025 / Published: 16 August 2025
(This article belongs to the Section Environmental and Green Processes)
Versions Notes

Abstract

Electrocatalytic water splitting has been demonstrated to be a highly efficient and promising technology for green hydrogen production. However, the inefficiency and instability of the cathode hinder its wide application in water electrolysis. Herein, we report a rapid Joule heating method for synthesizing the Ru-Mo oxide catalyst. Comprehensive characterization results confirmed that the as-prepared catalyst featured an internal porous structure with low crystallinity, which weakened the strength of Ru-H bonds through structural and electronic modulation. The enhanced HER performance was attributed to the incorporation of Mo4+ species, which strengthened Ru-O-Mo interactions. As tested, the optimized catalyst exhibited ultralow overpotentials (25.08 mV and 120.52 mV @ 10 and 100 mA cm−2, respectively) and excellent stability (100 h @ 100 mA cm−2) in a 1 M KOH solution. Meanwhile, the as-prepared catalyst was equipped in an anion exchange membrane (AEM) alkaline water electrolyzer, which could deliver 185 mA cm−2 at only 2.16 V with 100% Faradaic efficiency. This study provides a feasible strategy for constructing highly efficient low-crystallinity electrocatalysts.
Keywords: joule heating; Ru-based catalysts; oxide; low crystallinity; HER joule heating; Ru-based catalysts; oxide; low crystallinity; HER

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MDPI and ACS Style

Shi, T.; Huang, X.; Zhao, Z.; Li, Z.; Huang, K.; Meng, X. Rapid Joule-Heating Synthesis of Efficient Low-Crystallinity Ru-Mo Oxide Catalysts for Alkaline Hydrogen Evolution Reaction. Processes 2025, 13, 2594. https://doi.org/10.3390/pr13082594

AMA Style

Shi T, Huang X, Zhao Z, Li Z, Huang K, Meng X. Rapid Joule-Heating Synthesis of Efficient Low-Crystallinity Ru-Mo Oxide Catalysts for Alkaline Hydrogen Evolution Reaction. Processes. 2025; 13(8):2594. https://doi.org/10.3390/pr13082594

Chicago/Turabian Style

Shi, Tao, Xiaoling Huang, Zhan Zhao, Zizhen Li, Kelei Huang, and Xiangchao Meng. 2025. "Rapid Joule-Heating Synthesis of Efficient Low-Crystallinity Ru-Mo Oxide Catalysts for Alkaline Hydrogen Evolution Reaction" Processes 13, no. 8: 2594. https://doi.org/10.3390/pr13082594

APA Style

Shi, T., Huang, X., Zhao, Z., Li, Z., Huang, K., & Meng, X. (2025). Rapid Joule-Heating Synthesis of Efficient Low-Crystallinity Ru-Mo Oxide Catalysts for Alkaline Hydrogen Evolution Reaction. Processes, 13(8), 2594. https://doi.org/10.3390/pr13082594

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