Citation: Zuyou Song, Yong Jiang, Qiao Gou, Yini Mao, Yimin Jiang, Wei Shen, Ming Li, Rongxing He. Promoting the generation of active sites through "Co-O-Ru" electron transport bridges for efficient water splitting[J]. Chinese Chemical Letters, ;2025, 36(4): 109793. doi: 10.1016/j.cclet.2024.109793 shu

Promoting the generation of active sites through "Co-O-Ru" electron transport bridges for efficient water splitting

Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China

herx@swu.edu.cn

Received Date: 19 January 2024
Revised Date: 13 March 2024
Accepted Date: 19 March 2024
Available Online: 20 March 2024

Figures(6)

Exploring the intrinsic reasons for the dynamic reconstruction of catalysts during electrocatalytic reactions and their impact on activity enhancement still face severe challenges. Herein, the bifunctional catalyst Ru/V-CoO/CP with doping strategy and heterostructure was synthesized for overall water splitting. The Ru/V-CoO exhibits excellent activity for HER and OER with low overpotentials of 49, 147 mV at a current density of 10 mA/cm² in 1.0 mol/L KOH, respectively. The assembled electrolytic cell just needs voltages of 1.47 and 1.71 V to achieve 10 and 350 mA/cm² current density under the same conditions and delivers an outstanding stability for over 100 h, which is far superior to the commercial RuO₂Pt/C cell. Experimental and theoretical results indicate that the doping of V species and the formation of heterostructures lead to charge redistribution. More importantly, the leaching of V species induces electron transfer form Co to O and then Ru through the Co-O-Ru electron bridge, optimizes the adsorption strength of the key intermediate, thereby reducing the free energy barrier of the rate-determining step and improving catalytic activity. This work proposes an effective strategy of using cation dissolution to induce electron transfer through the electron bridge and thus regulate the electronic structure of catalysts, providing new ideas for the design and development of efficient and stable electrocatalysts.
- Heteroatom doping,
- Reconstruction,
- V leaching,
- Electron transfer,
- Overall water splitting
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