期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 298, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120568
关键词
Solar fuels; Polymeric carbon nitride; Artificial photosynthesis; Photocatalytic CO2 reduction
资金
- Ministry of Education, Singapore, under AcRF-Tier2 [MOE2018-T2-1-017]
- NTU seed funding for Solar Fuels Laboratory
- Ministry of Education, Singapore, under AcRF-Tier1 [MOE2019-T1002-012, RG102/19]
The study successfully created internal n-p homojunctions in polymeric carbon nitride by inserting phenyl groups, which accelerate the separation and transfer kinetics of photogenerated charge carriers, showing excellent photocatalytic performance.
We present the creation of internal n-p homojunctions in polymeric carbon nitride (PCN) by inserting phenyl groups, which bridge the adjacent tri-s-triazine moieties, into the PCN matrix through copolymerization methods. The linkage by the benzene rings results in a large pi-conjugated structure and controllable electronlocalization, allowing for modulating the electronic structure, optical properties, and lipophilicity of the prepared sample (CDT-DCDA-490). The electrochemical studies reveal the co-existence of both n-type and p-type domains in the polymeric skeleton of CDT-DCDA-490. The created internal n-p homojunctions can accelerate the separation and transfer kinetics of photogenerated charge carriers in the PCN matrix. As a result, the functionalized PCN photocatalyst showed excellent activities in the photocatalytic CO2 reduction and simultaneous olefin oxidation in the water-oil biphasic system, giving high selectivity for the production of CO and 2-cyclohexen-1-one. In addition, the CDT-DCDA-490 semiconductor also displays excellent PEC performance as photoanode. This work provides valuable guidance for future design and development of novel functional PCN-based photocatalysts with internal junctions for efficient solar fuels production.
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