Modulating the covalency of Ru-O bonds by dynamic reconstruction for efficient acidic oxygen evolution

Luqi Wang, Sung-Fu Hung, Sheng Zhao, Yue Wang, Suwan Bi, Shaoxiong Li, Jian-Jie Ma, Chenchen Zhang, Ying Zhang, Linlin Li (), Tsung-Yi Chen, Han-Yi Chen, Feng Hu (), Yuping Wu and Shengjie Peng ()
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Luqi Wang: Nanjing University of Aeronautics and Astronautics
Sung-Fu Hung: National Yang Ming Chiao Tung University
Sheng Zhao: Nanjing University of Aeronautics and Astronautics
Yue Wang: Nanjing University of Aeronautics and Astronautics
Suwan Bi: Nanjing University of Aeronautics and Astronautics
Shaoxiong Li: Nanjing University of Aeronautics and Astronautics
Jian-Jie Ma: National Yang Ming Chiao Tung University
Chenchen Zhang: Jiangnan University
Ying Zhang: Jiangnan University
Linlin Li: Nanjing University of Aeronautics and Astronautics
Tsung-Yi Chen: National Synchrotron Radiation Research Center
Han-Yi Chen: National Tsing Hua University
Feng Hu: Nanjing University of Aeronautics and Astronautics
Yuping Wu: Southeast University
Shengjie Peng: Nanjing University of Aeronautics and Astronautics

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Developing ruthenium-based oxide catalysts capable of suppressing lattice oxygen participation in the catalytic reaction process is crucial for maintaining stable oxygen evolution reaction (OER) under acidic conditions. Herein, we delicately construct a RuO2 nanoparticle-anchored LiCoO2 nanosheet electrocatalyst (RuO2/LiCoO2), achieving dynamic optimization of RuO2 during the reaction process and improving catalytic stability. Benefiting from the unique electrochemical delithiation characteristics of the LiCoO2 support, the covalency of the Ru-O bond is effectively regulated during the OER process. The weakened Ru-O covalent bond inhibits the participation of lattice oxygen in the catalytic reaction and ensures the continuous operation of the Ru active sites. Moreover, the extended Ru-O bond in the optimized RuO2/LiCoO2 catalyst reduces the formation energy barrier of the *OOH intermediates, accelerating the progress of the OER. As a result, the RuO2/LiCoO2 catalyst requires only an overpotential of 150 ± 2 mV at 10 mA cm−2 in 0.5 M H2SO4 and operates stably for 2000 h at 1 A cm−2 in a proton exchange membrane water electrolysis. This work opens new avenues for designing efficient ruthenium-based catalysts.

Date: 2025
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DOI: 10.1038/s41467-025-58654-0

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