The in situ synthesis of TiO_(2)semiconductor photocatalysts using Ti_(3)C_(2)MXene materials offers a highly effective approach to mitigate environmental and energy challenges by selectively reducing CO_(2)to valuabl...The in situ synthesis of TiO_(2)semiconductor photocatalysts using Ti_(3)C_(2)MXene materials offers a highly effective approach to mitigate environmental and energy challenges by selectively reducing CO_(2)to valuable chemicals like CH_(4).However,the transformation of Ti_(3)C_(2)into TiO_(2)is usually accompanied by severe agglomeration of particles,which leads to a reduction in the number of intrinsic active sites,adversely affecting the adsorption and conversion of CO_(2).To address this problem,polymethyl methacrylate(PMMA)was employed as a hard template to fabricate a bowl-shaped TiO_(2)supported on carbon layer(TiO_(2)/C)hybrid photocatalyst by a calcination method.The results showed that the obtained sample had a sufficiently large specific surface area and numerous active sites for CO_(2)adsorption and activation.The excellent conductivity of the carbon layer facilitated the separation of photogenerated carriers produced by TiO_(2),enabling the obtained TiO_(2)/C complexes exhibit CO_(2)reduction rates to CO and CH_(4)of 1.84μmol‧g^(−1)‧h^(−1)and 5.32μmol‧g^(−1)‧h^(−1),respectively,with the CH_(4)selectivity of 74%.The precise utilization of templates to refine the morphology of MXene oxidation products was thus demostrated,offering a practical approach for the application of MXene in the photocatalysis.展开更多
文摘The in situ synthesis of TiO_(2)semiconductor photocatalysts using Ti_(3)C_(2)MXene materials offers a highly effective approach to mitigate environmental and energy challenges by selectively reducing CO_(2)to valuable chemicals like CH_(4).However,the transformation of Ti_(3)C_(2)into TiO_(2)is usually accompanied by severe agglomeration of particles,which leads to a reduction in the number of intrinsic active sites,adversely affecting the adsorption and conversion of CO_(2).To address this problem,polymethyl methacrylate(PMMA)was employed as a hard template to fabricate a bowl-shaped TiO_(2)supported on carbon layer(TiO_(2)/C)hybrid photocatalyst by a calcination method.The results showed that the obtained sample had a sufficiently large specific surface area and numerous active sites for CO_(2)adsorption and activation.The excellent conductivity of the carbon layer facilitated the separation of photogenerated carriers produced by TiO_(2),enabling the obtained TiO_(2)/C complexes exhibit CO_(2)reduction rates to CO and CH_(4)of 1.84μmol‧g^(−1)‧h^(−1)and 5.32μmol‧g^(−1)‧h^(−1),respectively,with the CH_(4)selectivity of 74%.The precise utilization of templates to refine the morphology of MXene oxidation products was thus demostrated,offering a practical approach for the application of MXene in the photocatalysis.
