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Hydroxyl functionalised 2D/2D Ti2CTx MXene @ g-C3N4 photocatalyst confer selectivity for CO2 reduction to ethanol
Applied Surface Science ( IF 6.3 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.apsusc.2024.162104 Malavika Sunil S, Arunachaleshwar V, Jaffar Ali B.M
Applied Surface Science ( IF 6.3 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.apsusc.2024.162104 Malavika Sunil S, Arunachaleshwar V, Jaffar Ali B.M
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Production of solar biofuel where CO2 is reduced to hydrocarbon by harnessing sunlight through photocatalyst has attracted tremendous attention in recent years. In this study, titanium carbide MXene (Ti2CTx), a noble metal-free co-catalyst, was combined with graphitic carbon nitride (g-C3N4) to make a composite wherein 2D Ti2CTx was synthesized following modified MILD process followed by hydrothermal assisted co-polymerization with g-C3N4 resulting in the formation of hydroxyl functionalised Ti2C(OH)2 @ g-C3N4 composite (TiGCN). As Ti2C(OH)2 MXene being an efficient electron-coupled proton donor, the TiGCN exhibited high selectivity for CO2 adsorption and direct reduction to ethanol. Engineering the selective reduction of CO2 capability of TiGCN to ethanol, a C2 compound, was facilitated by OH terminalization imparted via ethanol-assisted sono-chemical processing. Our findings reveal that the loading of OH terminalized Ti2C(OH)2 at 0.8 wt% in g-C3N4 resulted in highest photocatalytic CO2 reduction, yielding 784 µmol gcat−1h−1 of ethanol. We further discuss the possible reaction mechanism of C2 conversion.
更新日期：2024-12-20
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