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

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...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2022-04, Vol.303, p.120871, Article 120871
Main Authors: Xie, Weiwei, Huang, Jianhao, Huang, Liting, Geng, Shipeng, Song, Shuqin, Tsiakaras, Panagiotis, Wang, Yi
Format: Article
Language:English
Subjects:
Catalytic activity
Cobalt
DFT
Electrical conductivity
Electrical resistivity
Electrocatalysts
Fluorine
Fluorine-doped CoMoO4
Fluorine-engineering
Molybdate
Nanosheets
Oxygen
Oxygen enrichment
Oxygen evolution reaction
Oxygen evolution reactions
Oxygen vacancies
Transition metal oxides
Vacancies
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Summary: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-2@GF 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). [Display omitted] •Fluorine-doped cobalt molybdate (F-CoMoO4) nanosheet arrays on graphite felt (GF) was synthesized.•Fluorine (F)-engineering of CoMoO4 nanomaterials greatly enhances F doping and O vacancies.•DFT reveals that F-engineering of CoMoO4 reduces its band-gap and improves electrical conductivity.•The obtained F-CoMoO4−x-2@GF manifests high OER activity with η = 256 mV at 10 mA cm−2.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.120871