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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Photocatalytic Water-Splitting with Layer-by-Layer Assembled Photoelectrodes for in situ Regeneration of NAD(P)H

2015년 9월 3일 16시 00분 48초
ENVR.P-561 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (목요일) 11:00~12:30
저자 및
전다솜, 류정기1,*
울산과학기술대학교(UNIST) 에너지공학, Korea
1울산과학기술대학교(UNIST) 에너지 및 화학공학부, Korea
It has long been a dream of scientists and engineers to realize industrial application of biocatalysts due to their prominent advantages over man-made catalysts. In principle, enzymatic catalysis can be used to synthesize virtually any kinds of chemicals including complex chiral molecules with a high selectivity and yield under mild conditions (e.g. ambient temperature and pressure, neutral pH, aqueous solution). Despite the tremendous benefits of biocatalysts, their practical application has been very limited especially because many useful enzymes consumes expensive cofactors to drive a catalytic reaction. To address such a problem, a huge amount of effort has been made to efficiently recycle cofactors. Among a lot of different methods reported to date, photochemical regeneration method has drawn great attentions from researchers due to its environmental friendliness. We have also previously reported that it is possible to biocatalytically synthesize chiral amino acids such as L-Glu by in situ photochemical regeneration of NAD(P)H cofactors with light-harvesting photosensitizers and electron mediators, the so-called biocatalytic artificial photosynthesis. To date, however, biocatalytic artificial photosynthesis is still at its infancy because sacrificial electron donors are still required for regeneration of cofactors. To address such a problem, a novel method have been introduced to fabricate photoelectrodes in the recent study. Photoelectrodes can split water and produce electrons, provide them to electron mediators, and eventually enable regeneration of cofactors. We found that multiple components for photocatalytic water-splitting can be readily assembled on substrate by a simple layer-by-layer assembly technique. Also, water-splitting activity is shown by the prepared electrode under visible light irradiation. Based on these findings, further integrate biocatalytic assemblies are tried on the photoelectrode to take a step closer into realization of biocatalytic artificial photosynthesis.