MOFs-derived C-In2O3/g-C3N4 heterojunction for enhanced photoreduction CO2

Converting carbon dioxide into valuable chemicals is seen as a promising strategy for slowing global warming while enriching energy supplies. Photocatalysts derived from Metal-Organic Frameworks (MOFs) can not only overcome the problem of poor stability of MOFs, but also inherit the advantages of MOFs to some extent. Herein, carbon doped In2O3 (C-In2O3) hollow tubular is synthesized by calcination of MIL-68(In) as sacrificial template. Then C-In2O3 and g-C3N4 are hydrothermal to obtain C-In2O3/g-C3N4 heterojunction. The unique hollow tubular structure, carbon doping and type-II heterojunction of C-In2O3/g-C3N4 expand the light absorption capacity and promote the separation of photogenerated electron-hole pairs, thus significantly improve the activity of photocatalytic reduction of CO2. Among them, C-In2O3/g-C3N4-5 shows the highest CO2 reduction activity towards CO (153.42 μmol/g/h) and CH4 (110.31 μmol/g/h).