首页|Atomic-level coupled RuO2/BaRuO3 heterostructure for efficient alkaline hydrogen evolution reaction

Atomic-level coupled RuO2/BaRuO3 heterostructure for efficient alkaline hydrogen evolution reaction

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The slow water dissociation is the rate-determining step that slows down the reaction rate in alkaline hydrogen evolution reaction(HER).Optimizing the surface electronic structure of the catalyst to lower the energy barrier of water dissociation and regulating the binding strength of adsorption intermediates are crucial strategy for boosting the catalytic performance of HER.In this study,RuO2/BaRuO3(RBRO)heterostructures with abundant oxygen vacancies and lattice distortion were in-situ constructed under a low temperature via the thermal decomposition of gel-precursor.The RBRO heterostructures obtained at 550 ℃ exhibited the highest HER activity in 1 M KOH,showing an ultra-low overpotential of 16 mV at 10 mA cm-2 and a Tafel slope of 33.37 mV dec-1.Additionally,the material demonstrated remarkable durability,with only 25 mV of degradation in overpotential after 200 h of stability testing at 10 mA cm-2.Density functional theory calculations revealed that the redistribution of charges at the heterojunction interface can optimize the binding energies of H*and OH*and effectively lower the energy barrier of water dissociation.This research offers novel perspectives on surpassing the water dis-sociation threshold of alkaline HER catalysts by means of a systematic design of heterogeneous interfaces.

HeterostructureHydrogen evolution reactionInterfacial electron transferOxygen vacancies

Yueying Yan、Tian Meng、Yuting Chen、Yang Yang、Dewen Wang、Zhicai Xing、Xiurong Yang

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State Key Laboratory of Electroanalytical Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,Jilin,China

School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,Anhui,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

217210032220208022034006

2024

10.1016/j.jechem.2023.09.028

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.88(1)
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