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Enhanced Visible‐Light Photoelectrocatalytic Activity of {001}TiO 2 Electrodes Assisted with Carbon Quantum Dots
Author(s) -
Zhang Yanan,
Tian Hongyi,
Zhao Guohua
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500246
Subject(s) - photocurrent , visible spectrum , carbon quantum dots , anatase , materials science , photon upconversion , photochemistry , photocatalysis , electrode , quantum dot , carbon fibers , optoelectronics , chemical engineering , chemistry , catalysis , doping , composite material , biochemistry , composite number , engineering
Aiming at further developing the application of highly reactive {001}TiO 2 in photoelectrocatalytic oxidation, which is only limited by its response in UV light, carbon quantum dots (CQDs) are introduced to provide the excitation sources for {001}TiO 2 through upconversion from visible to UV light. The CQDs/{001}TiO 2 photoelectrode is prepared by loading the CQDs on truncated square pyramid‐shaped TiO 2 spheres exposed to high‐activity {001} facets, using a simple impregnation–drying method. The results indicate that the CQDs/{001}TiO 2 possess enhanced photoelectrocatalytic ability with an increased photocurrent of 12 mA cm −2 and photocurrent decay time of 1.75 s. Compared with pure {001}TiO 2 , the surface photochemical reaction resistance of CQDs/{001}TiO 2 decreases, whereas the number of photogenerated carriers increase greatly. This visible‐light photoelectrocatalytic activity results from the synergistic effect of CQDs and the {001} facet of anatase TiO 2 .