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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Solar energy conversion by cyanobacterium Anabaena variabilis using double mediators

2019년 8월 22일 15시 31분 37초
ELEC.P-425 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
저자 및
Jinhwan Lee, Hyejun Cho, Sunghyun Kim1,*
Department of Biotechnology, Konkuk University, Korea
1Biotechnology, Konkuk University, Korea
Photosynthesis taking place in the thylakoid membrane of plants, algae, and cyanobacteria is a highly developed system that uses solar energy. Recently, the whole photosynthetic organisms or units are being used as a photo-biocatalyst of photo-bioelectrochemical devices to convert solar energy to electrical energy. In this study, we suggest a method which converts solar energy into electric energy using cyanobacterium Anabaena variabilis (A. variabilis) with the 2,6-dimethyl-1,4-benzoquinone (DMBQ) and ferricyanide as an electron transfer mediator. Among several possible quinone derivatives, DMBQ was confirmed as a suitable lipid-soluble electron transfer mediator that accept electrons from cyanobacteria. In order to solve the low reversibility of DMBQ on the indium tin oxide (ITO) electrode surface, ferricyanide, which is reversible on the ITO electrode surface, was employed as the complementary mediator to transfer the electrons of DMBQH2 to the electrode. When two mediators were used, the photocurrents generated from A. variabilis were observed. The photocurrent more than 2 mA cm-2 was observed at 60 μg Chl mL-1 of A. variabilis containing double mediators under one sun irradiation. This result shows possibility of converting solar energy to electricity using photosynthetic microorganisms as a photo-biocatalyst for water oxidation.