Promoting visible-light photocatalytic activities for carbon nitride based 0D/2D/2D hybrid system: Beyond the conventional 4-electron mechanism

Fazal Raziq, Jingxuan He, Jiantuo Gan, Muhammad Humayun, M. Bilal Faheem, Atef Iqbal, Asif Hayat, Saima Fazal, Jiabao Yi, Yang Zhao, K. Dhanabalan, Xiaoqiang Wu, Abdurashid Mavlonov, Tariq Ali, Fakhrul Hassan, Xia Xiang, Xiaotao Zu, Huahai Shen, Sean Li, Liang Qiao

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

Photocatalysis is regarded as one of promising technology for future clean and sustaniable energy applications. Herein, we have fabricated Au-modified reduced graphene oxide coupled with carbon nitride (Au/rGO/g-C3N4) as novel 0D/2D/2D photocatalytic nanocomposites. The optimized sample 2Au/0.6rGO/g-C3N4 exhibits exceptional visible-light activity for water splititng and CO2 reduction with quantum efficiency of 3.82 % and 1.98 %, respectively. Electrochemistry and ultraviolent photoemission are combined to determine the band alignments and elaborate associated water splitting path-way mechanism. It is validated that due to intrinsic deep valence band position of g-C3N4, the obtained nanocomposites exhibit unusual two-step two-electron way of water oxidization through intermediate H2O2 catalyzed by rGO addition. The exceptional photoactivities are attributed to dual functions of enhanced charge separation and two-electron water oxidization facilitated by rGO and surface plasmon effect of decorated Au. Our work provides illuminations for low cost and high efficiency photocatalytic water splitting and CO2 reduction applications.
Original languageEnglish (US)
JournalApplied Catalysis B: Environmental
Volume270
DOIs
StatePublished - Aug 5 2020
Externally publishedYes

ASJC Scopus subject areas

  • General Environmental Science
  • Catalysis
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'Promoting visible-light photocatalytic activities for carbon nitride based 0D/2D/2D hybrid system: Beyond the conventional 4-electron mechanism'. Together they form a unique fingerprint.

Cite this