119th General Meeting of the KCS

Type Poster Presentation
Area 환경에너지
Room No. 포스터발표장
Time 4월 20일 (목요일) 11:00~12:30
Code ENVR.P-498
Subject Optimization of hydrogen release from ammonia borane by using plasmonic photocatalyst: Gold deposited TiO2
Authors 조성원, 최원용1,*
POSTECH 화학공학과, Korea
1POSTECH 환경공학부, Korea
Abstract Hydrogen has been considered as a promising alternative energy source. However, storage of Hydrogen has been a big problem to fuel cell system. As a solution, hydrogen storage solid materials have received a lot of researcher's attention. Among the reported hydrogen storage solid materials, especially, ammonia borane (AB) drew much attention because it has many advantages (e.g. low molecular mass (30.87 g/mol), high hydrogen capacity (19.6 wt%) and stability in solid state) compared with other materials. In addition, in the presence of an appropriate catalyst, AB can in principle produce 3 equivalent moles of hydrogen gas by a hydrolytic decomposition reaction. In this study, optimization condition of hydrogen generation from the decomposition of AB is studied by applying Au-TiO2 plasmonic photocatalyst under visible light irradiation. TiO2 can only absorb ultraviolet light, owing to its large bandgap (~3.2 eV). However, when the gold nanoparticles are deposited on TiO2 surface, it can absorb visible light due to surface plasmon resonance(SPR) of gold nanoparticles. The decomposition of AB is studied under visible light irradiation due to the absorption efficiency of the prepared catalyst, Au-TiO2. 1 wt% of Au-TiO2 supported on three different types of TiO2 viz. anatase (ST-01), rutile and P25, are employed to compare their photocatalytic performances. In addition, different amount of gold photo-deposited and 1 wt% of gold impregnated ST-01 are also tested for comparison. Among these photocatalysts, 1 wt% of gold photo-deposited ST-01 produces 85 μmol of hydrogen and it shows the best photocatalytic activity, because Au1ST-01 has the largest surface area and fewer recombination centers. This research will be a fundamental base for optimization of photocatalytic activity by using various metal-metal oxide heterojunction photocatalysts.
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