Journal
MATERIALS RESEARCH BULLETIN
Volume 133, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2020.111078
Keywords
In2O3/g-C3N4; Heterojunction; Photocatalytic; H-2; DFT
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Funding
- National Natural Science Foundation of China [21676065, 51472062]
- Opening Project of Key Laboratory of Polyoxometalate Science of Ministry of Education of China
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The study synthesized In2O3/g-C3N4 heterojunction structure using In-MOF precursor and melamine, which effectively inhibits the reorganization of electron-hole pairs and significantly enhances the photocatalytic hydrogen evolution activity by providing transmission channels and accelerating electron transport.
The construction of heterojunction structures is considered as a promising method in the field of photocatalytic hydrogen evolution. Here, In-MOF precursor and melamine were mixed, then calcined and annealed to synthesize a series of In2O3/g-C3N4 heterojunction composites with multi-porosity. Porous and fluffy In2O3 provide a transmission channel, and the heterostructures can further accelerate electron transport due to the potential difference, thereby inhibiting the reorganization of electron-hole pairs. The In2O3/g-C3N4 photocatalytic hydrogen evolution average rate can reach 68.7 mu mol h(-1), which is almost 9.3 times that of pristine g-C3N4 (7.4 mu mol h(-1)). Notably, the charge transfer process between In2O3/g-C3N4 heterostructure is investigated by DFT calculation. The results show that the polarization field prevents the recombination of electron-hole pairs and accelerates the transfer of photogenerated electrons so that the lifetime of photogenerated carriers is increased, ultimately enhancing the photocatalytic activity.
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