Xiaolong Wu,Mingnv Guo,Ziqi Wang,Ruiming Fang,Jiang He,Zhongqing Yang
For the purpose of further improve the efficiency of photocatalytic CO 2 reduction and realize cascade utilization of the full solar spectrum, Bi 2 MoO 6 quantum dots were in situ deposited on the surface of carbonized pomelo peel (CPP) to form Bi 2 MoO 6 @CPP 0D/3D heterojunction catalyst. With a diameter of less than 10 nm, the quantum-limited field effects confirm the successful construction of Bi 2 MoO 6 quantum dot. The band structure of Bi 2 MoO 6 @CPP 0D/3D is beneficial heterojunction , which is able to utilize not only the UV–Vis band to generate photogenerated carriers that reduce CO 2 to CO mainly, but also the IR band of the solar spectrum to increase the temperature of photothermal catalytic reaction. The experiment indicated that the photogenerated electrons generated by Bi 2 MoO 6 @CPP 0D/3D heterojunction catalysts flowed through the interface C-O-Bi bridge and migrated to the surface of CPP, forming an electron interface. The interface C-O-Bi electron bridge enhanced the separation ability of photogenerated carriers, thereby increasing the CO yield to 50.77 μmol/(g·h). Further experiment showed that the oxygen-containing groups’ concentration of CPP were ameliorated by thermal activation and acid-base activation, which increased the concentration of interface C-O-Bi electron bridge between Bi 2 MoO 6 and CPP, finally promoting the CO yield to 66.94 μmol/(g·h), which is 12.3 times greater than that of bulk Bi 2 MoO 6 .
Mingnv Guo,Ziqi Wang,Xiaolong Wu,Jiaqi Qiu,Linlin Gu,Zhongqing Yang
The carrier migration limitation has been a key factor restricting the photothermal catalytic CO2 reduction. To further enhance carrier transport, Bi2MoO6 quantum dots (BM QDs) are deposited on the surface of alkali-activated pomelo-peel-derived carbon (CPP-A) to construct CPP-A/BM QDs 0D/3D heterojunctions in this paper. BM QDs have extremely short carrier transport distances and achieve photothermal synergy through the graded utilization of the full solar spectrum. The carbon framework of CPP promotes the high dispersion of BM QDs (3 nm) and allows the local surface temperature of the catalyst to increase rapidly up to 100 °C. The critical role of heat enhances the diffusion, adsorption, and carrier migration processes of CO2 and provides the energy to cross the CO2 activation energy barrier. More importantly, the oxygen-containing groups of CPP and BM QDs form a C–O–Bi interfacial electron bridge, which provides a high-speed channel for carrier transport across the interface, allowing many electrons generated by BM QDs to migrate rapidly to the CPP surface, inducing CPP as a new electron-rich surface for rapid CO2 activation, which results in an ultrahigh CO yield of 61.44 μmol/(g·h) for CPP-A/BM QDs, and the catalytic activity is increased by 9.12 times.
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