A direct Z-scheme g-C3N4/SnS2 photocatalyst with superior visible-light CO2 reduction performance

被引:758
作者
Di, Tingmin [1 ]
Zhu, Bicheng [1 ]
Cheng, Bei [1 ]
Yu, Jiaguo [1 ,2 ]
Xu, Jingsan [3 ]
机构
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[2] King Abdulaziz Univ, Fac Sci, Dept Phys, Jeddah 21589, Saudi Arabia
[3] Queensland Univ Technol, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia
基金
澳大利亚研究理事会;
关键词
Direct Z-scheme; Internal electric field; Photocatalytic CO2 reduction; g-C3N4; SnS2; GRAPHITIC CARBON NITRIDE; REDUCED GRAPHENE OXIDE; HYDROGEN EVOLUTION; SOLAR FUELS; ARTIFICIAL PHOTOSYNTHESIS; METHANOL OXIDATION; SNS2; NANOSHEETS; TIO2; ANATASE; WATER;
D O I
10.1016/j.jcat.2017.06.006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photocatalytic reduction of CO2 to solar fuels is an ideal approach to simultaneously solve the global warming and energy crisis issues. Constructing a direct Z-scheme heterojunction is an effective way to overcome the drawbacks of single-component or conventional heterogeneous photocatalysts for photo catalytic CO2 reduction. Here, a novel type of direct Z-scheme g-C3N4/SnS2 heterojunction was constructed by depositing SnS2 quantum dots onto the g-C3N4 surface in situ via a simple one-step hydrothermal method. L-Cysteine not only acted as the sulfur source, but also grafted ammine groups onto g-C3N4 in the hydrothermal process, which greatly enhanced the CO2 uptake of the composite. XPS analysis and density functional theory (DFT) calculation show that electron transfer occurred from g-C3N4 to SnS2, resulting in the formation of interfacial internal electric fields (IEF) between the two semiconductors at equilibrium. As a result, Z-scheme charge transfer took place under photoexcitation, with the electrons in SnS2 combining with the holes in g-C3N4, which improved the extraction and utilization of photoinduced electron in g-C3N4. The g-C3N4/SnS2 hybrid shows superior photocatalytic CO2 reduction as compared with individual g-C3N4 and SnS2, which should be attributed to the IEF-induced direct Z scheme as well as improved CO2 adsorption capacity. In situ FTIR spectra illustrate that HCOOH appeared as an intermediate during the CO2 conversion, which can only be generated by g-C3N4 according to the energy level of the photoinduced electrons, further confirming the Z-scheme configuration for the gC(3)N(4)/SnS2 system. (C) 2017 Elsevier Inc. All rights reserved.
引用
收藏
页码:532 / 541
页数:10
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