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Oxygen vacancy-mediated Ru,Fe co-doped Ni(OH)2 for enhanced hydrogen evolution kinetics
Ruiteng Sun1, Sailong Wang1, Zexing Liang2
1Key Laboratory of Eco-chemical Engineering, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
Abstract:
Developing efficient and stable hydrogen evolution reaction (HER) electrocatalysts is critical for achieving an efficient hydrogen economy through water electrolysis. The strategy of oxygen vacancies mediated Ru, Fe co-doped Ni(OH)2 (RuFeNi-OvH) is proposed, in which oxygen vacancies efficiently modulate the catalyst's electronic structure and d-band center of RuFeNi-OH, thus reducing water dissociation energy barrier and speeding reaction kinetics. Theoretical calculations also indicate that Ru serves as the water adsorption and dissociation site, while Ni serves as the hydrogen evolution site. Benefiting from above, the RuFeNi-OvH catalyst exhibits excellent HER performance in 1.0 M KOH, achieving a current density of 1 A cm-2 with an overpotential of only 350 mV, and operating stably for 200 h in a three-electrode system, demonstrating remarkable stability. With a production cost per ton of hydrogen much lower than the goal established by the U.S. Department of Energy for 2026, RuFeNi-OvH demonstrates exceptional cost-effectiveness in anion exchange membrane (AEM) electrolyzers. This study presents new design ideas by creating vacancies as efficient and stable HER catalysts for encouraging the practical development of hydrogen production technology via water electrolysis.
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