Quasi-solid medium for photoinduced charge separation |
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| Institution: | 1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA;2. Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, 48109, USA;1. Univ Lyon, ENS de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France;2. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan;1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia, 750021, PR China;2. College of Environment Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225009, China;1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China;3. International Joint Research Laboratory for Low-Carbon & Environmental Materials of Henan Province, Zhengzhou University, Zhengzhou 450002, China;4. Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;1. Department of Chemistry, Shahreza Branch, Islamic Azad University, P.O. Box 311-86145, Shahreza, Isfahan, Islamic Republic of Iran;2. Young Researchers and Elite Club, Shahreza Branch, Islamic Azad University, Shahreza, Islamic Republic of Iran;3. Razi Chemistry Research Center (RCRC), Shahreza Branch, Islamic Azad University, Isfahan, Islamic Republic of Iran |
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| Abstract: | New quasi-solid was proposed as a medium for photoinduced charge separation. Photoinduced charge separation and hydrogen production with the new quasi-solid medium using polysaccharide has been investigated. The new medium is a quasi-solid polysaccharide containing a large quantity of water. This medium is tight and elastic solid, obtained by cooling an aqueous solution of a polysaccharide (agarose or κ-carrageenan in this paper) to room temperature after it was dissolved in water by heating. When the quasi-solid (agarose or κ-carrageenan) involving sacrificial electron donor ethylenediaminetetraacetate (EDTA), tris(2,2′-bipyridine)ruthenium complex (Ru(bpy)3]2+) and methylviologen (MV2+) was irradiated with visible light, methylviologen cation radical (MV +) was formed. The formation rate of methylviologen cation radical in an agarose solid was faster than that in a κ-carrageenan one. Photoinduced hydrogen production was achieved with this system containing additionally proton reduction catalyst such as platinum black (Pt black), platinum oxide (PtO2), and ruthenium oxide (RuO2). The characteristics of this solid medium for photochemical reactions were discussed. |
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