TY - JOUR
T1 - Solar-driven CO2 conversion over Co2+ doped 0D/2D TiO2/g-C3N4 heterostructure
T2 - Insights into the role of Co2+ and cocatalyst
AU - Shi, Hainan
AU - Du, Jun
AU - Hou, Jungang
AU - Ni, Wenjun
AU - Song, Chunshan
AU - Li, Keyan
AU - Gurzadyan, Gagik G.
AU - Guo, Xinwen
N1 - Funding Information:
This work was financially supported by the National Key Research and Development Program of China ( 2016YFB0600902-4 ) and the Fundamental Research Funds for the Central Universities (Grant No. DUT19LK17 ).
Publisher Copyright:
© 2020 Elsevier Editora Ltda. All rights reserved.
PY - 2020/5
Y1 - 2020/5
N2 - Low charge separation efficiency is the critical limitation for solar-driven CO2 conversion into chemicals fuels. Accelerating charge transfer in the interface of photocatalysts is an intriguing approach to suppress charge recombination. Herein, Co2+ doped 0D/2D TiO2 quantum dots confined in graphitic carbon nitride (CoTiCN) heterostructure was prepared by in-situ pyrolysis of MOFs and urea. Co2+ serves as the bridge of linking 0D TiO2 and 2D g-C3N4 in the interface, and consequently accelerates charge transfer in the interface from 2D g-C3N4 to 0D TiO2. As a result, CO evolution rate for photocatalytic CO2 reduction reached 290 μmol g-1 h-1, much higher than those of pure g-C3N4 and TiO2/g-C3N4. In addition, photocatalytic mechanism study indicates that [Co(bpy)3]Cl2 in the system functions as cocatalyst without any photocatalytic activity under visible light irradiation. Electron transfer occurs from heterogeneous photocatalyst to [Co(bpy)3]Cl2, which acts as the electron transporter as active sites to catalyze CO2 reduction into CO. This work provides an insight into the design of metal doped 0D/2D material towards visible light driven CO2 reduction from the viewpoint of promoting charge transfer in the interface and the understanding of the photocatalytic mechanism of cocatalyst in system.
AB - Low charge separation efficiency is the critical limitation for solar-driven CO2 conversion into chemicals fuels. Accelerating charge transfer in the interface of photocatalysts is an intriguing approach to suppress charge recombination. Herein, Co2+ doped 0D/2D TiO2 quantum dots confined in graphitic carbon nitride (CoTiCN) heterostructure was prepared by in-situ pyrolysis of MOFs and urea. Co2+ serves as the bridge of linking 0D TiO2 and 2D g-C3N4 in the interface, and consequently accelerates charge transfer in the interface from 2D g-C3N4 to 0D TiO2. As a result, CO evolution rate for photocatalytic CO2 reduction reached 290 μmol g-1 h-1, much higher than those of pure g-C3N4 and TiO2/g-C3N4. In addition, photocatalytic mechanism study indicates that [Co(bpy)3]Cl2 in the system functions as cocatalyst without any photocatalytic activity under visible light irradiation. Electron transfer occurs from heterogeneous photocatalyst to [Co(bpy)3]Cl2, which acts as the electron transporter as active sites to catalyze CO2 reduction into CO. This work provides an insight into the design of metal doped 0D/2D material towards visible light driven CO2 reduction from the viewpoint of promoting charge transfer in the interface and the understanding of the photocatalytic mechanism of cocatalyst in system.
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U2 - 10.1016/j.jcou.2020.01.005
DO - 10.1016/j.jcou.2020.01.005
M3 - Article
AN - SCOPUS:85083401735
SN - 2212-9820
VL - 38
SP - 16
EP - 23
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
ER -