Construction of 2D-coal-based graphene/2D-bismuth vanadate compound for effective photocatalytic CO2 reduction to CH3OH

2D/2D Carbon Nitride/Zn-Doped Bismuth Vanadium Oxide S-Scheme Heterojunction for Enhancing Photocatalytic CO2 Reduction into Methanol

“…Intriguingly, after an in situ combination of CN and ZnBVO, the as-obtained CN-ZnBVO- X nanohybrids showed significantly enhanced CO 2 photoreduction activity compared with their single-component counterparts, and also with the increment in the CN content, the CH 3 OH yield for the binary catalyst increased gradually followed by decreased. In particular, the highest CH 3 OH formation rate of 609.1 μmol g –1 h –1 was achieved on the butterfly-like CN-ZnBVO-3 heterojunctions, which was 2.4 and 2.0 times greater than that of single CN and ZnBVO, respectively (Figure b), markedly outperforming most previously reported photocatalysts (Table S2), such as BiVO 4 /Bi 4 Ti 3 O 12 (16.6 μmol g –1 for CH 3 OH), CGO/BiVO 4 (537.78 μmol g –1 h –1 for CH 3 OH), V v -rich o -BiVO 4 layers (398.3 μmol g –1 h –1 for CH 3 OH), and Cu-CuTCPP/g-C 3 N 4 (18.5 μmol g –1 h –1 for C 2 H 6 ) . Not only that, CN-ZnBVO-3 had a high CH 3 OH selectivity up to 90.5%, much larger than CN (73.7%) and ZnBVO (81.8%), probably due to the synergy caused by the formation of 2D/2D heterostructure between CN and ZnBVO.…”

“…The formation of heterojunction leads to the generation of the built-in electric field with direction from BiVO 4 to Bi 4 Ti 3 O 12 , speeding up the transfer of the photogenerated electrons. Compared with bulk composites, the well-organized 2D/2D heterostructures have significant advantages in enhancing photocarrier separation kinetics to facilitate CO 2 multielectron coupling reactions, owing to the large interfacial contact area, short charge diffusion path, and fast interfacial charge separation. − For instance, Yang et al reported an ultrathin 2D/2D GDY/Bi 2 WO 6 photocatalyst, the construction of the ultrathin 2D heterojunction greatly contributes to boosting CH 3 OH generation . Similarly, the enhanced photocatalytic CO 2 methanation was achieved over the 2D/2D OV–Ti 3 AlC 2 /f-C 3 N 4 nanohybrids due to the high surface photoelectrons density caused by the 2D/2D heterostructure .…”

Progress in photocatalytic CO2reduction based on single-atom catalysts

“…14 CO 2 reduction reactions may be conducted in this technique by electrons/holes following photoexcitation of semiconductor photocatalysts by sun irradiation, which has major benets since photocatalytic processes can be performed under moderate circumstances. 15,16 The unique feature of photocatalytic CO 2 reduction reactions is the wide variety of CO 2 reduction products, including HCOOH, [17][18][19][20] CO, [21][22][23] CH 4 , [24][25][26][27][28] CH 3 OH, [29][30][31][32] etc., which is mostly determined by the kind of active sites on the photocatalyst's surface.…”