Diluting the Resistance of Built-in Electric Fields in Oxygen Vacancy-enriched Ru/NiMoO<sub>4-x</sub> for Enhanced Hydrogen Spillover in Alkaline Seawater Splitting.

Liu, Xiaobin; Wang, Xuanyi; Li, Kun; Tang, Junheng; Zhu, Jiawei; Chi, Jingqi; Lai, Jianping; Wang, Lei

Diluting the Resistance of Built-in Electric Fields in Oxygen Vacancy-enriched Ru/NiMoO_4-x for Enhanced Hydrogen Spillover in Alkaline Seawater Splitting.

Liu, Xiaobin; Wang, Xuanyi; Li, Kun; Tang, Junheng; Zhu, Jiawei; Chi, Jingqi; Lai, Jianping; Wang, Lei.

Afiliación

Liu X; Key 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, P. R. China.
Wang X; College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.
Li K; Key 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, P. R. China.
Tang J; College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.
Zhu J; Key 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, P. R. China.
Chi J; College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.
Lai J; Key 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, P. R. China.
Wang L; Key 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, P. R. China.

Angew Chem Int Ed Engl ; 63(6): e202316319, 2024 Feb 05.

Article en En | MEDLINE | ID: mdl-38095848

ABSTRACT

ABSTRACT

Recently, hydrogen spillover based binary (HSBB) catalysts have received widespread attention due to the sufficiently utilized reaction sites. However, the specific regulation mechanism of spillover intensity is still unclear. Herein, we have fabricated oxygen vacancies enriched Ru/NiMoO4-x to investigate the internal relationship between electron supply and mechanism of hydrogen spillover enhancement. The DFT calculations cooperate with in situ Raman spectrum to uncover that the H* spillover from NiMoO4-x to Ru. Meanwhile, oxygen vacancies weakened the electron supply from Ru to NiMoO4-x , which contributes to dilute the resistance of built-in electric field (BEF) for hydrogen spillover. In addition, the higher ion concentration in electrolyte will promote the H* adsorption step obviously, which is demonstrated by in situ EIS tests. As a result, the Ru/NiMoO4-x exhibits a low overpotential of 206âmV at 3.0âA cm-2 , a small Tafel slope of 28.8âmV dec-1 , and an excellent durability of 550âh at the current density of 0.5âA cm-2 for HER in 1.0âM KOH seawater.

Palabras clave

Absorbed H; Built-in Electric Field; Hydrogen Spillover; Oxygen Vacancies

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