F and Mo Co-doped CoO Nanoneedle Arrays for Enhanced Oxygen Evolution Activity

Abstract

Rational tuning electronic configuration of CoO is important for accelerating sluggish oxygen evolution reaction (OER) kinetics. This work reports a simultaneous incorporation of highly electronegative fluorine (F) and high-valence molybdenum (Mo) into CoO nanoneedles (denoted as FMo-CoO). The dual-doping strategy boosts Co³⁺ content and compressive strain, which strengthens Co—O bond covalency and enables a lattice-oxygen-mediated (LOM) pathway during OER catalysis. Concurrently, the nanoneedle morphology coupled with F/Mo co-doping synergistically enhances surface properties, granting FMo-CoO exceptional superhydrophilicity and superaerophobicity. As a result, FMo-CoO achieves outstanding OER performance in alkaline media, requiring only overpotential of 287 mV at 10 mA/cm². This work provides a novel method to boost the OER performance of CoO by anion and cation ions doping.

Keywords

CoO / Oxygen evolution reaction / Ion doping

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