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Jinqiu Shi, Min Wang, Luwei Peng, Xi Luo, Jiajun Meng, Jianfeng Xu, Jinli Qiao. Engineered Mo-O-Fe active centers for Efficient and Stable Overall Water Splitting along the Lattice-Oxygen Mechanism. Green Energy&Environment. doi: 10.1016/j.gee.2026.03.015
Citation: Jinqiu Shi, Min Wang, Luwei Peng, Xi Luo, Jiajun Meng, Jianfeng Xu, Jinli Qiao. Engineered Mo-O-Fe active centers for Efficient and Stable Overall Water Splitting along the Lattice-Oxygen Mechanism. Green Energy&Environment. doi: 10.1016/j.gee.2026.03.015
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Engineered Mo-O-Fe active centers for Efficient and Stable Overall Water Splitting along the Lattice-Oxygen Mechanism

doi: 10.1016/j.gee.2026.03.015

  • a. State Key Laboratory of Advanced Fiber Materials, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;

  • b. School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, China;

  • c. Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China;

  • d. Technical Development Division, Shanghai Boiler Works Co. Ltd;

  • e. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092

Funds:

This work was supported by the National Natural Science Foundation of China (22572026, 21972017), the Natural Science Foundation of Yancheng (YCBK2024004), and the Basic Research Program of Jiangsu (BK20251089).

  • Received date 17 January 2026, Accepted date 23 March 2026, RevRecd date 19 March 2026, Available online 13 April 2026
    Abstract
  • The covalency of the metal-oxygen (M-O) bond is significantly enhanced in the transition metal sites with high oxidation states, thereby enabling the lattice oxygen-mediated mechanism (LOM) to break the traditional linear scaling limitations of the oxygen evolution reaction (OER). Here, an innovative MoO2 surface is designed to adjust the covalency of Fe-O bond in NiFe layered double hydroxide (NiFe-LDH), which results in the formation of Fe-O-Mo bridge with high valence Fe species for OER along the LOM. The MoO2-modified NiFe-LDH anchored on nickel foam, shows a 3D nanoflower-like heterostructure of interwoven porous nanosheets, which exposes abundant active sites, boosts charge transfer, and modulates the reaction microenvironment via heterojunction and confinement effects. This designed architecture shows excellent bifunctional catalytic activity, manifested by low overpotentials for HER (131 mV) and OER (226 mV) at 10 mA cm-2, respectively. The overall water electrolyzer verifies the device-level application potential assembled with MoO2/NiFe-LDH@NF as both cathode and anode, and achieves a low cell voltage of 1.650 V at 0.5 A cm-2 and stable operation for over 700 hours.

     

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