Rational modulation of p-n homojunction in P-doped g-C3N4 decorated with Ti3C2 for photocatalytic overall water splitting

Zizheng Ai, Yongliang Shao, Bin Chang, Lei Zhang, Jianxing Shen, Yongzhong Wu, Baibiao Huang, Xiaopeng Hao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

As a metal-free polymeric semiconductor, graphitic carbon nitride (g-C3N4) is a promising candidate for photocatalytic water splitting but suffers from the insufficient optical absorption and sluggish utilization of photocarriers. Herein, based on the energy band engineering theory, a new design philosophy of tunable p-n homojunction is proposed and realized in a novel P-doped g-C3N4 (PCN) material. Through regulating the tendency of transformation in p-n homojunction, a strong internal electric field is built and integrated with two secondary internal electric fields by further decorating with Ti3C2, leading to the formation of a triple-internal electric field system. Thus the spatial separation efficiency of photocarriers is improved and their lifetime is prolonged. The specific photocatalyst exhibits excellent overall water splitting performance in pure water with a notable quantum yield. This work presents a peculiar concept of adjustable p-n homojunction and holds great significance for the rational design of advanced photocatalyst in water splitting.

Original languageEnglish (US)
Article number118077
JournalApplied Catalysis B: Environmental
Volume259
DOIs
StatePublished - Dec 15 2019

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Foundation of China (Contract No. 51872162), the Major Basic Program of the Natural Science Foundation of Shandong Province (Contract No. ZR2017ZB0317) and Taishan Scholars Program of Shandong Province .

Funding Information:
This work is supported by the National Natural Science Foundation of China (Contract No. 51872162), the Major Basic Program of the Natural Science Foundation of Shandong Province (Contract No. ZR2017ZB0317) and Taishan Scholars Program of Shandong Province.

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Graphitic carbon nitride
  • Overall water splitting
  • Triple-internal electric field
  • Tunable p-n homojunction

ASJC Scopus subject areas

  • Catalysis
  • General Environmental Science
  • Process Chemistry and Technology

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