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A 3D Hierarchical Ti 3 C 2 T x /TiO 2 Heterojunction for Enhanced Photocatalytic CO 2 Reduction
Author(s) -
Song Qinjun,
Shen Baojia,
Yu Jiaguo,
Cao Shaowen
Publication year - 2021
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202100155
Subject(s) - photocatalysis , nanosheet , materials science , heterojunction , mesoporous material , calcination , nanotechnology , chemical engineering , catalysis , optoelectronics , chemistry , organic chemistry , engineering
The construction of three‐dimensional (3D) hierarchical photocatalysts from two‐dimensional (2D) nanosheets has attracted lots of interest due to its unique structural properties. Herein we design a 3D hierarchical structure of Ti 3 C 2 T x based on its 2D prototype as a precursor. TiO 2 is in‐situ formed on the surface of Ti 3 C 2 T x nanosheet by calcination, thereby obtaining a 3D hierarchical TiO 2 /Ti 3 C 2 T x heterojunction. The rational design induces the intimate coupling of TiO 2 and Ti 3 C 2 T x , and macro‐mesopores in the hierarchical structure. The optimized sample exhibits a relatively high photocatalytic CH 4 evolution activity of 4.41 μmol ⋅ g −1 ⋅ h −1 , which is almost twice that of P25 (2.32 μmol ⋅ g −1 ⋅ h −1 ). The enhanced photocatalytic performance arises from the more efficient electron‐hole separation and better light harvesting of the 3D hierarchical structure. Moreover, the excellent CO 2 adsorption ability of Ti 3 C 2 T x also ensures effective contact between CO 2 molecules and photoinduced electrons from TiO 2 . This work demonstrates a facile strategy for the preparation of precursor‐induced functional materials toward various applications.