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Graphitic carbon nitride with thermally-induced nitrogen defects: an efficient process to enhance photocatalytic H2production performance

Journal Article


Abstract


  • Graphitic carbon nitride (g-C3N4, CN) with nitrogen vacancies was synthesized by a controlled thermal etching method in a semi-closed air-conditioning system. The defect-modified g-C3N4shows an excellent photocatalytic performance demonstrated by water splitting under visible light irradiation. With proper heat-treatment durations such as 2 h (CN2) and 4 h (CN4) at 550 °C, the hydrogen production rates significantly increase to 100 µmol h-1and 72 µmol h-1, which are 11 times and 8 times the rate of the pristine CN (8.8 µmol h-1) respectively. The excellent hydrogen production performance of nitrogen defect modified CN2 is due to the synergy effect of the decreased band gap, enlarged specific surface area and increased separation/migration efficiency of photoinduced charge carriers. This simple defect engineering method provides a good paradigm to improve the photocatalytic performance by tailoring the electronic and physical structures of g-C3N4.

UOW Authors


  •   Dong, Guangzhi (external author)
  •   Wen, Yun (external author)
  •   Fan, Huiqing (external author)
  •   Wang, Chao (external author)
  •   Cheng, Zhenxiang
  •   Zhang, Mingchang (external author)
  •   Ma, Jiangwei (external author)
  •   Zhang, Shujun

Publication Date


  • 2020

Citation


  • Dong, G., Wen, Y., Fan, H., Wang, C., Cheng, Z., Zhang, M., Ma, J. & Zhang, S. (2020). Graphitic carbon nitride with thermally-induced nitrogen defects: an efficient process to enhance photocatalytic H2production performance. RSC Advances, 10 (32), 18632-18638.

Scopus Eid


  • 2-s2.0-85085732316

Number Of Pages


  • 6

Start Page


  • 18632

End Page


  • 18638

Volume


  • 10

Issue


  • 32

Place Of Publication


  • United Kingdom

Abstract


  • Graphitic carbon nitride (g-C3N4, CN) with nitrogen vacancies was synthesized by a controlled thermal etching method in a semi-closed air-conditioning system. The defect-modified g-C3N4shows an excellent photocatalytic performance demonstrated by water splitting under visible light irradiation. With proper heat-treatment durations such as 2 h (CN2) and 4 h (CN4) at 550 °C, the hydrogen production rates significantly increase to 100 µmol h-1and 72 µmol h-1, which are 11 times and 8 times the rate of the pristine CN (8.8 µmol h-1) respectively. The excellent hydrogen production performance of nitrogen defect modified CN2 is due to the synergy effect of the decreased band gap, enlarged specific surface area and increased separation/migration efficiency of photoinduced charge carriers. This simple defect engineering method provides a good paradigm to improve the photocatalytic performance by tailoring the electronic and physical structures of g-C3N4.

UOW Authors


  •   Dong, Guangzhi (external author)
  •   Wen, Yun (external author)
  •   Fan, Huiqing (external author)
  •   Wang, Chao (external author)
  •   Cheng, Zhenxiang
  •   Zhang, Mingchang (external author)
  •   Ma, Jiangwei (external author)
  •   Zhang, Shujun

Publication Date


  • 2020

Citation


  • Dong, G., Wen, Y., Fan, H., Wang, C., Cheng, Z., Zhang, M., Ma, J. & Zhang, S. (2020). Graphitic carbon nitride with thermally-induced nitrogen defects: an efficient process to enhance photocatalytic H2production performance. RSC Advances, 10 (32), 18632-18638.

Scopus Eid


  • 2-s2.0-85085732316

Number Of Pages


  • 6

Start Page


  • 18632

End Page


  • 18638

Volume


  • 10

Issue


  • 32

Place Of Publication


  • United Kingdom