能源化学(英文版)

能源化学(英文版) ›› 2020, Vol. 49 ›› Issue (10): 214-223.DOI: 10.1016/j.jechem.2020.02.035

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Supramolecular electrostatic self-assembly of mesoporous thin-walled graphitic carbon nitride microtubes for highly efficient visible-light photocatalytic activities

Yilin Chen, Xingchen He, Dongsheng Guo, Yanqin Cai, Jingling Chen, Yun Zheng, Bifen Gao, Bizhou Lin   

  1. Fujian Key Laboratory of Photoelectric Functional Materials,College of Materials Science and Engineering,Huaqiao University,Xiamen 361021,Fujian,China
  • 收稿日期:2019-12-31 修回日期:2020-02-18 出版日期:2020-10-15 发布日期:2020-12-18
  • 通讯作者: Yilin Chen
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China(21902051),the Natural Science Foundation of Fujian Province(2017J01014 and 2019J05090),and the Graphene Power and Composite Research Center of Fujian Province(2017H2001).

Supramolecular electrostatic self-assembly of mesoporous thin-walled graphitic carbon nitride microtubes for highly efficient visible-light photocatalytic activities

Yilin Chen, Xingchen He, Dongsheng Guo, Yanqin Cai, Jingling Chen, Yun Zheng, Bifen Gao, Bizhou Lin   

  1. Fujian Key Laboratory of Photoelectric Functional Materials,College of Materials Science and Engineering,Huaqiao University,Xiamen 361021,Fujian,China
  • Received:2019-12-31 Revised:2020-02-18 Online:2020-10-15 Published:2020-12-18
  • Contact: Yilin Chen
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China(21902051),the Natural Science Foundation of Fujian Province(2017J01014 and 2019J05090),and the Graphene Power and Composite Research Center of Fujian Province(2017H2001).

摘要： For efficient solar energy conversion,the morphology engineering of hollow graphitic carbon nitride (g-C3N4) is one of the promising approachs benefiting from abundant exposed active sites and short photocarrier transport distances,but is difficult to control on account of easy structural collapse.Herein,a facile supramolecular electrostatic self-assembly strategy has been developed for the first time to fabricate mesoporous thin-walled g-C3N4 microtubes (mtw-CNT) with shell thickness of ca.13 nm.The morphological control of g-C3N4 enhances specific surface area by 12 times,induces stronger optical absorption,widens bandgap by 0.18 eV,improves photocurrent density by 2.5 times,and prolongs lifetimes of charge carriers from bulk to surface,compared with those of bulk g-C3N4.As a consequence,the transformed g-C3N4 exhibits the optimum photocatalytic H2-production rate of 3.99 mmol·h-1·g-1 (λ >420 nm) with remarkable apparent quantum efficiency of 8.7% (λ=420 ±15 nm) and long-term stability.Moreover,mtw-CNT also achieves high photocatalytic CO2-to-CO selectivity of 96% (λ >420 nm),much better than those on the most previously reported porous g-C3N4 photocatalysts prepared by the conventional hard-templating and soft-templating methods.

关键词: Graphitic carbon nitride, Thin wall, Mesoporous microtube, H2 production, CO2 reduction, Photocatalysis

Abstract: For efficient solar energy conversion,the morphology engineering of hollow graphitic carbon nitride (g-C3N4) is one of the promising approachs benefiting from abundant exposed active sites and short photocarrier transport distances,but is difficult to control on account of easy structural collapse.Herein,a facile supramolecular electrostatic self-assembly strategy has been developed for the first time to fabricate mesoporous thin-walled g-C3N4 microtubes (mtw-CNT) with shell thickness of ca.13 nm.The morphological control of g-C3N4 enhances specific surface area by 12 times,induces stronger optical absorption,widens bandgap by 0.18 eV,improves photocurrent density by 2.5 times,and prolongs lifetimes of charge carriers from bulk to surface,compared with those of bulk g-C3N4.As a consequence,the transformed g-C3N4 exhibits the optimum photocatalytic H2-production rate of 3.99 mmol·h-1·g-1 (λ >420 nm) with remarkable apparent quantum efficiency of 8.7% (λ=420 ±15 nm) and long-term stability.Moreover,mtw-CNT also achieves high photocatalytic CO2-to-CO selectivity of 96% (λ >420 nm),much better than those on the most previously reported porous g-C3N4 photocatalysts prepared by the conventional hard-templating and soft-templating methods.

Key words: Graphitic carbon nitride, Thin wall, Mesoporous microtube, H2 production, CO2 reduction, Photocatalysis