Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 272, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119006
Keywords
Step-scheme; 2D van der Waals heterojunction; Photocatalytic CO2; Reduction; In situ X-ray photoelectron spectroscopy; MXene
Funding
- NSFC [51961135303, 51932007, U1905215, 21871217, U1705251]
- National Key Research and Development Program of China [2018YFB1502001]
- National Postdoctoral Program for Innovative Talents [BX20180231]
- Innovative Research Funds of SKLWUT [2017-ZD-4]
- National Science Center, Poland [2018/30/Q/ST5/00776]
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Herein, two-dimensional (2D) TiO2 mesoporous nanosheets with three to four C3N4 layers grown in situ are employed to design a core-shell 2D/2D van der Waals heterojunction (TiO2/C3N4). Edge-terminated zero-dimensional (0D) Ti3C2 MXene quantum dots (TCQD) are subsequently integrated in the C3N4 surface via electrostatic interactions. The constructed 2D/2D/0D TiO2/C3N4/Ti3C2 composite heterojunction photocatalyst exhibits enhanced CO2 reduction activity compared to TiO2, C3N4, TiO2/C3N4, C3N4/Ti3C2 for CO and CH4 production. A step-scheme (S-scheme) charge transfer mechanism operates for the prepared samples during CO2 reduction, as authenticated by in situ X-ray photoelectron spectroscopy and electron paramagnetic resonance analysis. This study provides a paradigm of a rational structural design for regulating the number and type of heterointerfaces and further insights into the mechanism of multijunction photocatalysts.
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