Lattice oxygen activation and local electric field enhancement by co-doping Fe and F in CoO nanoneedle arrays for industrial electrocatalytic water oxidation

Pengcheng Ye, Keqing Fang, Haiyan Wang (), Yahao Wang, Hao Huang (), Chenbin Mo, Jiqiang Ning and Yong Hu ()
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Pengcheng Ye: Zhejiang Normal University
Keqing Fang: Zhejiang Normal University
Haiyan Wang: Zhejiang Normal University
Yahao Wang: Zhejiang Normal University
Hao Huang: University of South-Eastern Norway
Chenbin Mo: Zhejiang Normal University
Jiqiang Ning: Fudan University
Yong Hu: Zhejiang A&F University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Oxygen evolution reaction (OER) is critical to renewable energy conversion technologies, but the structure-activity relationships and underlying catalytic mechanisms in catalysts are not fully understood. We herein demonstrate a strategy to promote OER with simultaneously achieved lattice oxygen activation and enhanced local electric field by dual doping of cations and anions. Rough arrays of Fe and F co-doped CoO nanoneedles are constructed, and a low overpotential of 277 mV at 500 mA cm−2 is achieved. The dually doped Fe and F could cooperatively tailor the electronic properties of CoO, leading to improved metal-oxygen covalency and stimulated lattice oxygen activation. Particularly, Fe doping induces a synergetic effect of tip enhancement and proximity effect, which effectively concentrates OH− ions, optimizes reaction energy barrier and promotes O2 desorption. This work demonstrates a conceptual strategy to couple lattice oxygen and local electric field for effective electrocatalytic water oxidation.

Date: 2024
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DOI: 10.1038/s41467-024-45320-0

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