Molybdate

Catalysis

Oxygen evolution

Engineering

Electrochemistry

Metallurgy

Materials science

Nanosheet

Inorganic chemistry

Chemical engineering

Electrocatalyst

Physical chemistry

Nanotechnology

Tafel equation

Organic chemistry

Oxygen

Doping

Conductivity

Cobalt

Chemistry

Electrode

Fluorine

Optoelectronics

Overpotential

Applied Catalysis B Environment and Energy

Herein, we have synthesized fluorine-doped cobalt molybdate (F-CoMoO4) nanosheet arrays on graphite felt (GF) to efficiently promote the oxygen evolution reaction (OER) kinetics. Experimental results show that F-CoMoO4 has two significant effects: 1) inducing rich oxygen vacancies, and 2) optimizing the electronic configuration of CoMoO4, which is beneficial for exposure of active sites. The as-obtained F-CoMoO4-x[email protected] electrocatalyst exhibits lower OER overpotential of 256 mV at 10 mA cm−2 with a small Tafel slope of 64.4 mV dec−1 in alkaline solution, resulting in a nearly 100 mV of OER catalytic activity enhancement compared with that of pure CoMoO4. DFT results reveal that the change of Mo 4d state reduces the band-gap and increases the electrical conductivity of CoMoO4, thus optimizing its intrinsic activity. The synthesis strategy used in this work may provide some ideas for enhancing the electrical conductivity of other transition metal oxides (TMOs).

Novel fluorine-doped cobalt molybdate nanosheets with enriched oxygen-vacancies for improved oxygen evolution reaction activity