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Bandgap engineering of polymetric carbon nitride copolymerized by 2,5,8-triamino-tri-s-triazine (melem) and barbituric acid for efficient nonsacrificial photocatalytic H2O2 production
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Kyushu Institute of Technology, Joint Laboratory of Yangzhou University, Kyushu Institute of Technology
Kyushu Institute of Technology
Yangzhou University, Joint Laboratory of Yangzhou University, Kyushu Institute of Technology
Yangzhou University, Joint Laboratory of Yangzhou University, Kyushu Institute of Technology
Shenzhen University
Shenzhen University
Kyushu Institute of Technology, Joint Laboratory of Yangzhou University, Kyushu Institute of Technology
抄録
Photocatalytic production of H2O2 from water and oxygen utilizing polymetric carbon nitride (PCN) is a promising alternative to the energy-consuming anthraquinone method. However, insufficient oxidation potential and limited light-absorption have restricted its further improvement. Herein, PCN with sufficient oxidation potential and improved visible-light usage (up to 550 nm) was prepared by co-polymerization of 2,5,8-triamino-tri-s-triazine (melem) and barbituric acid (BA). With the loading of Na2CoP2O7 as a water-oxidation co-catalyst, this novel PCN system showed a record-high apparent quantum efficiency (420 nm) of 8.0 % and a solar-to-chemical conversion efficiency of 0.30 % for H2O2 production. This improvement is attributed to the introduced O 2p states by CO groups remained in the PCN matrix, leading to a positive valence band maximum of 1.85 eV (vs. SHE). The co-polymerization of BA and melem combined with Na2CoP2O7 loading also suppressed the charge recombination, resulting in a rapid stepwise one-electron to one-electron reaction for efficient H2O2 production.
雑誌名
Applied Catalysis B: Environmental
巻
271
ページ
118917
発行年
2020-05-25
出版者
Elsevier
ISSN
0926-3373
DOI
https://doi.org/10.1016/j.apcatb.2020.118917
権利
Copyright (c) 2020 Elsevier B.V. All rights reserved.
Bandgap engineering of polymetric carbon nitride copolymerized by 2,5,8-triamino-tri-s-triazine (melem) and barbituric acid for efficient nonsacrificial photocatalytic H2O2 production
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