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114th General Meeting of Korean Chemical Society Cu2ZnSnS4 (CZTS) nanocrystal/TiO2 composites for efficient photocatalytic reduction of CO2

Submission Date :
8 / 28 / 2014 , 15 : 22 : 00
Abstract Number :
Presenting Type:
Poster Presentation
Presenting Area :
Authors :
인수일*, 김기돈
대구경북과학기술원(DGIST) 에너지 시스템 공학 전공, Korea
Assigned Code :
ENVR.P-1272 Assigend Code Guideline
Presenting Time :
10월 15일 (수요일) 16:00~19:00
CO2 emissions is one of the largest political causing global warming. A variety of approaches for addressing CO2 emissions are currently under research. Photocatalyst is one of the effective strategies to solve this issue. TiO2-based materials are the most stable and preferred photocatalysts. But TiO2 are only active under ultraviolet (UV) irradiation, because TiO2 has a demerit of wide bandgap (3.3eV). 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. The band alignment between Cu2ZnSnS4 (CZTS) nanocrystal and TiO2 favors charge separation across the interface, eliminating inefficiencies associated with direct carrier recombination. In this work, an attempt was done to fabricate hybrid photocatalyst based upon p-n heterojunction and applied for CO2 photoreduction. CZTS, a well-known p-type semiconductor with a narrower direct band gap of 1.5eV, was synthesized and coupled with n-type TiO2. The synthesis of hybrid photocatalyts was confirmed by numerous characterization techniques such as XRD, TEM, and UV-Vis spectroscopy.