Journal
APPLIED SURFACE SCIENCE
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148707
Keywords
Z-scheme heterojunction; H-2 production; Defected PCN; MnS
Categories
Funding
- National Natural Science Foundation of China [21546014]
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By using a synergistically integrated strategy of defect engineering and Z-scheme heterojunction, the photocatalytic activity of PCN catalyst was enhanced for efficient solar-to-chemical energy conversion. The high PHE activity of MnS/D-PCN composite was attributed to the effects of defects and Z-scheme pathway.
Given that low hydrogen active sites and serious photoexcited electron-hole recombination greatly limits the solar-to-chemical energy conversion efficiency, a synergistically integrated strategy of the defect engineering and the construction of Z-scheme heterojunction is introduced to the design of PCN photocatalyst, a strand-like polymer carbon nitride, in this work to resolve these problems and enhance the photocatalytic activity. The PHE activity was intimately related to MnS compositions. A maximum hydrogen evolution rate of 670.5 mu mol/g/h could be achieved over 5% MnS/D-PCN composite, almost 5 times the rate of D-PCN and 18.4 times higher than that pristine PCN. This high PHE activity of MnS/D-PCN was attributed to the following factors: defects effects and Z-scheme heterojunction. We found that defects sites, on one hand, were the docking sites of MnS through a linkage to bridging the MnS and defected PCN, which offered an efficient spatial transfer path for electron-hole pairs at the interface, on the other hand, acted as the hydrogen evolving centers gathering the excited photoelectrons from D-PCN and MnS. Furthermore, Z-scheme pathway greatly enhanced the photoexcited charge separation due to their enormous driving force in internal electric field of p-n heterojunction.
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