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Preparation of Oxygen Deficient Black Titania for Visible Light Assisted Hydrogen Production

Title
Preparation of Oxygen Deficient Black Titania for Visible Light Assisted Hydrogen Production
Translated Title
가시광 이용하여 수소 생산하기 위한 산소결핍 블랙 타이타니아의 합성
Authors
Jeon, Jong Pil
DGIST Authors
Jeon, Jong Pil; Yu, Jong Sung; Lim, Sang Kyoo
Advisor(s)
Yu, Jong Sung
Co-Advisor(s)
Lim, Sang Kyoo
Issue Date
2017
Available Date
2017-01-18
Degree Date
2017. 2
Type
Thesis
Keywords
PhotocatalystTiO2water splittingband gapoxygen vacancy광촉매물 분해밴드 갭산소 결함
Abstract
Black TiO2 is defects engineered material to enhance optical properties. However, in spite of the remarkable improvement and extent optical absorption to visible light, it is failed to demonstrate expected photocatalytic activity due to the presence of a number of recombination centers. In this report, reduced black TiO2 is prepared by a new approach which is the controlled magnesiothermic reduction under a 5% H2/Ar atmosphere. After reduction, surface defects are produced such as oxygen vacancies, surface lattice disorder, and hydrogenation and, as a result, band structure also changed. The prepared material possesses an optimal band structure, surface defects, oxygen vacancies, and charge recombination centers and exhibit dramatically enhanced optical absorption in the visible and infrared region. The combinations induce synergistic effects to make black TiO2 material possible to show an outstanding hydrogen production ability in the methanol-water system in the presence of Pt as a co-catalyst. The material shows remarkable stability and shows the maximum hydrogen production rates are 43 mmol h-1 g-1 and 440μmol h-1 g-1 under the full solar wavelength range of light and visible light, respectively, and these are remarkably enhanced values than previously reported black TiO2 materials. ⓒ 2017 DGIST
Table Of Contents
I. INTRODUCTION 1 -- 1.1 Motivation 1 -- 1.2 Precedented researches 2 -- II. EXPERIMENTAL DETAILS 5 -- 2.1 Materials 5 -- 2.2 Preparation of Titania Based Photocatalyst 5 -- 2.3 Characterization 6 -- III. RESULTS AND DISCUSSION 9 -- IV. CONCLUSION 31
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002326611
http://hdl.handle.net/20.500.11750/1519
DOI
10.22677/thesis.2326611
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
Collection:
Energy Systems EngineeringThesesMaster


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