Photothermal Catalytic Reduction of CO2 by Cobalt Silicate Heterojunction Constructed from Clay Minerals
نویسندگان
چکیده
The coupled utilization of solar and thermal energy is considered an efficient way to improve the efficiency CO2 reduction. Herein, palygorskite (Pal) clay as a silicon source, while Co2+ introduced prepare two-dimensional Co2SiO4 nanosheets, excess leads growth Co3O4 on surface obtain S-scheme Co2SiO4/Co3O4−x heterojunction, which facilitates charge transfer maintains higher redox potentials. Benefiting from black color narrow band gap, cobalt oxide can increase light absorption produce local photothermal effect. Under proper activation conditions, photoelectrons captured by abundant oxygen vacancies secondary leap semiconductor conduction (CB), suppressing recombination electron-hole pairs, thus favoring electron Co2SiO4/Co3O4−x. composites not only have vacancies, but also large specific area for adsorption CO2. yields CH3OH Co2SiO4/Co3O4−5% reach high 48.9 μmol·g−1·h−1 under simulated sunlight irradiation. In situ DRIFTS used explore photocatalytic reduction mechanism. It found that effect generation key intermediate COOH* species. This work provides new strategy catalytic taking advantage natural energy.
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ژورنال
عنوان ژورنال: Catalysts
سال: 2022
ISSN: ['2073-4344']
DOI: https://doi.org/10.3390/catal13010032