The efficient conversion of CO2 into hydrocarbon fuels (CH4) with high selectivity is considered as a great challenge in photocatalysis owing to the multiple-electron transfer pathway and competitive H2 generation. Herein, we developed carbon dots (CDs)-modulated S-scheme heterojunction of CDs/NiAl-LDH@In2O3 (C-DH@IN) through a facile in-situ hydrothermal method. Thanks to the multi-shell nanotube structure, the C-DH@IN shows an enhanced CH4 evolution rate of 10.67 µmol h−1 g−1 and higher selectivity of CH4 (85.70%) compared with In2O3 and NiAl-LDH@In2O3 binary catalyst in the pure water without sacrificial agent. Electron spin resonance (ESR) and in situ Fourier transform infrared spectra verify that the constructed S-scheme heterojunction can possess the strong redox capability and the HCOO− and CH3O− as critical intermediates play an important role in selective CO2 reduction to generate CH4. Furthermore, CDs with superior photoabsorption can boost the electron transfer and absorb H+, thus improving the integration of H+ and CO2 molecule. Therefore, this work emphasizes a facile strategy to achieve efficient CO2-to-CH4 conversion based on construction of CDs-based heterojunction catalysts.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |