A unique Z-scheme 2D/2D nanosheet heterojunction design to harness charge transfer for photocatalysis

Huijie Cheng, Jungang Hou, Osamu Takeda, Xing Min Guo, Komin Shu

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

Heterojunction photocatalysts could provide a potential strategy to solve the serious energy and environmental crises. However, the required heterojunction photocatalyts with high charge-separation efficiency and strong redox ability, which have unique dimensionality-dependent integrative and synergic effects, are intriguing but still underdeveloped. Here, for the first time, we design and fabricate 2D/2D heterojunctions between carbon nitride nanosheets and oxygen-vacancies confined in bismuth titanate mesoporous nanosheets. Especially, selective pollutant transformation of rhodamine B and 4-chlorophenol solutions under visible-light irradiation has been conducted by the use of 2D/2D heterojunction photocatalysts. Based on the steady-state and transient photoluminescence spectra and electron spin resonance technology, the Z-scheme energy-transfer mechanism is identified and the photogenerated charge carriers in the 2D/2D heterojunctions display a prolonged lifetime and higher separation compared to those in carbon nitride and bismuth titanate alone. This work will shed light on the rational design of more complex 2D/2D heterojunctions with accompanying applications in solar energy conversion and environmental remediation fields.

Original languageEnglish
Pages (from-to)11006-11013
Number of pages8
JournalJournal of Materials Chemistry A
Volume3
Issue number20
DOIs
Publication statusPublished - 2015 May 28

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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