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Ti 3 C 2 : An Ideal Co‐catalyst?
Author(s) -
Wang Biao,
Wang Mengye,
Liu Fangyan,
Zhang Qian,
Yao Shan,
Liu Xiaolong,
Huang Feng
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201913095
Subject(s) - raman spectroscopy , photocatalysis , photoluminescence , catalysis , materials science , photocurrent , high resolution transmission electron microscopy , quantum dot , photochemistry , graphene , nanotechnology , chemistry , organic chemistry , physics , optoelectronics , transmission electron microscopy , optics
How 2D Ti 3 C 2 enhances photocatalytic efficiency remains unclear. Now, it is shown that it is graphene quantum dots (GQDs) derived from Ti 3 C 2 , rather than 2D Ti 3 C 2 itself, that play the role of co‐catalyst for La 2 Ti 2 O 7 /Ti 3 C 2 (LTC) composites during the photocatalytic reaction. After modification of Ti 3 C 2 derivatives, the photocatalytic efficiency of La 2 Ti 2 O 7 is enhanced 16 times over pure La 2 Ti 2 O 7 . Solid‐state NMR, Raman, and HRTEM results confirm the existence of GQDs in Ti 3 C 2 and LTC composites. The GQDs are formed during the chemical change from Ti 3 AlC 2 to Ti 3 C 2 via HF etching, as Ti atoms are removed and unsaturated carbon bonds are left, which react with each other to form sp 2 π‐conjugation GQDs. 2D Ti 3 C 2 is completely oxidized to CO x modified TiO x species, causing Ti 3 C 2 to lose its electrical conductivity and the role as co‐catalyst. GQDs largely suppress the photogenerated charge recombination of La 2 Ti 2 O 7 , as revealed by the photoluminescence (PL) and transient photocurrent.
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