Enhanced overall water splitting by CQDs-coupled RuO2-IrO2 heterojunction in acidic media

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry Pub Date : 2025-03-17 DOI:10.1016/j.jechem.2025.02.050

Yuwen Su , Han Wu , Siyang Wang , Zhiang Hu , Jian Li , Jiangwei Chang , Guangchao Yin , Siyu Lu

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Abstract

The development of highly active and stable bifunctional electrocatalysts in acidic media is crucial to hydrogen production by proton exchange membrane. In this study, we designed a RuO₂-IrO₂ heterostructure catalyst coupled by carbon quantum dots (CQDs). The catalyst showed excellent electrocatalytic performance for water splitting under acidic conditions. The overpotentials of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) were as low as 180 and 15 mV at 10 mA/cm² in 0.5 M H₂SO₄, respectively. The acid electrolytic cell developed with RuO₂-IrO₂@CQDs as anode and cathode operated stably at 10 mA/cm² for 120 h. In situ measurements and theoretical calculation reveal that the unique lattice oxygen mechanism path of RuO₂-IrO₂@CQDs can bypass the OOH* intermediate and breaks the linear relationship of adsorbent evolution mechanism path, resulting in higher OER catalytic activity.

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来源期刊

Journal of Energy Chemistry CHEMISTRY, APPLIED-CHEMISTRY, PHYSICAL

CiteScore

19.10

自引率

8.40%

发文量

3631

审稿时长

15 days

期刊介绍： The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies. This journal focuses on original research papers covering various topics within energy chemistry worldwide, including: Optimized utilization of fossil energy Hydrogen energy Conversion and storage of electrochemical energy Capture, storage, and chemical conversion of carbon dioxide Materials and nanotechnologies for energy conversion and storage Chemistry in biomass conversion Chemistry in the utilization of solar energy