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Hybrid TiO2-CZTS Photocatalyst for Efficient Conversion of CO2 into Methane under Irradiation

Title
Hybrid TiO2-CZTS Photocatalyst for Efficient Conversion of CO2 into Methane under Irradiation
Translated Title
이산화탄소를 탄화수소로 효율적으로 전환하기 위한 하이브리드 TiO2-CZTS 광촉매
Authors
Kim, Ki Don
DGIST Authors
Kim, Ki Don; In, Su Il; Park, Yi Seul
Advisor(s)
In, Su Il
Co-Advisor(s)
Park, Yi Seul
Issue Date
2015
Degree Date
2015. 2
Type
Thesis
Keywords
Carbon dioxideGlobal warmingPhotocatalystsHybrid TiO2-Cu 2ZnSnS4p-n heterojunction structure이산화탄소탄화수소광촉매
Abstract
Carbon dioxide is a key problem causing global warming. Photocatalytic CO2 conversion into hydrocarbons is one of the effective strategies to solve this issue. Amongst photocatalysts, TiO2 (anatase)-based materials are the most stable and preferred photocatalysts. However along with its good characteristics, TiO2 has a disadvantage of wide bandgap (3.2 eV). For the efficient use of TiO2 photocatalysts, one of the approaches is to couple it with another small bandgap photocatalytic material focused on broadened light absorption region. Cu2ZnSnS4 (CZTS), a well-known p-type semiconductor, is a new type of promising material to fulfill the above requirement. It has a narrow direct band gap of 1.45~1.61 eV and composed of abundant and non-toxic elements. In addition, due to proper bandgap alignment, the hybrid TiO2-Cu2ZnSnS4 (CZTS) can absorb a broader region of light as compared to TiO2 and enhance the photocatalytic conversion of CO2. Furthermore, p-n heterojunction forms in between ptype CZTS and n-type TiO2 and can reduce the electron-hole recombination, contributing to the performance improvement of the hybrid photocatalytic materials for CO2 photoconversion. In this study, an attempt is done to fabricate hybrid photocatalyts based upon p-n heterojunction and applied for CO2 photoreduction. CZTS, a wellknown p-type semiconductor with a narrower direct band gap of 1.5 eV, is synthesized and coupled with n-type TiO2. The synthesis of hybrid photocatalyts is confirmed by numerous characterization techniques such as XRD, TEM, and UV/Vis spectroscopy. The methane production also is measured by using gas chromatogram (GC). Our research provides a novel information for the design of efficient p-n heterojunction structure based nanocomposite photocatalysts. ⓒ 2015 DGIST
Table Of Contents
1. INTRODUCTION 1 -- 1.1 Background 1 -- 1.2 photocatalyst for conversion CO2 2 -- 1.3 Hot injection method 3 -- References 4 -- 2. EXPERIMENTAL EQIUPMENT 5 -- 2.1 X-Ray Diffractometer (XRD) 5 -- 2.2 X-ray Photoelectron Spectrometer (XPS) 6 -- 2.3 Brunauer-Emmett-Teller (BET) 7 -- 2.4 Transmission electron microscope (TEM) 8 -- 2.5 Ultraviolet-visible spectrophotometry (UV/Vis) 9 -- 2.6 Gas Chromatogram (GC) 10 -- Figure reference 11 -- 3. Hybrid TiO2-CZTS Photocatalyst for Efficient Conversion of CO2 into Methane under Solar Irradiation. 12 -- 3.1 Introduction 12 -- 3.2 Experimental section 13 -- 3.2.1 Materials 13 -- 3.2.2 Synthetic method 13 -- 3.2.3 Analysis for sample characterization 14 -- 3.2.4 CO2 conversion test method 14 -- 3.3 Results and Discussion 15 -- 4.Conclusions 28 -- References 29
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001941981
http://hdl.handle.net/20.500.11750/1375
DOI
10.22677/thesis.1941981
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
There are no files associated with this item.
Collection:
Energy Science and EngineeringThesesMaster


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