4.8 Article

Electrocatalytic conversion of methane to ethanol by ultrathin WO3 nanosheets: Oxygen vacancy engineering

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APPLIED MATERIALS TODAY
卷 32, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.apmt.2023.101855

关键词

Electrocatalysis; CH 4 Electrooxidation; Ethanol; WO 3 nanosheets

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Ultrathin WO3 nanosheets with oxygen vacancies were synthesized as robust electrocatalysts for highly efficient methane conversion to ethanol. By optimizing the sample, an ultrahigh ethanol yield and selectivity of 125,090 μmol gcat-1 h-1 and 99.4% were achieved within 8 hours at a low potential of 1.2 V vs. RHE, outperforming previous reports. This work provides a constructive avenue for designing electrocatalysts with high activity and selectivity for methane conversion.
Electrocatalytic conversion of CH4 into valuable liquid products is an attractive strategy for utilization of natural gas, however, it was still constrained by low product yields. Herein, ultrathin WO3 nanosheets with adequate oxygen vacancies (Ov) as robust electrocatalysts for highly efficient CH4 conversion to ethanol were synthesized. Using the optimized sample, the ultrahigh ethanol yield and selectivity of 125,090 & mu;mol gcat - 1 h-1 and 99.4% are achieved within 8 h at low potential of 1.2 V vs. RHE, both of which outperform the previous reports as we know. The corresponding ethanol Faradic efficiencies is 50.7%. In-situ Raman spectra and density functional theory calculation reveal that Ov effectively enable C-H activation and C-C coupling, and eventually promotes the electrocatalytic activity and ethanol selectivity for CH4 conversion. This work provides a constructive avenue for designing electrocatalysts with both high activity and selectivity to realize CH4 conversion.

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