Optical energy storage by bilayer electrodes, polymerized coordination compounds of ruthenium or iron.

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概要

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• Electrochemistry of bilayer electrodes has until now been investigated mainly in the dark. For the further development of the photoelectrochemistry of bilayer electrodes and its application to optical-energy storage, a polymer of <I>N</I>-[4-[2-(trimethoxysilyl)ethyl]benzyl]-<I>N</I>′-methyl-4,4′-bipyridinium dibromide (BVSiBr<SUB>2</SUB>), a photoredox siloxane polymer, was employed as a photosensitive outer-layer, and bis(2,2′-bipyridine)bis(4-vinylpyridine)ruthenium(II) bis(hexafluorophosphate), [Ru(bpy)<SUB>2</SUB>(vpy)<SUB>2</SUB>](PF<SUB>6</SUB>)<SUB>2</SUB>, or tris(4-methyl-4′-viny-2,2′-bipyridine)iron(II) bis(hexafluorophosphate), [Fe(vbpy)<SUB>3</SUB>](PF<SUB>6</SUB>)<SUB>2</SUB> was electrochemically polymerized as the inner layer on the surface of an SnO<SUB>2</SUB> electrode. Direct and indirect photochemical reductions(trapping) of the outer layer siloxan polymer were attempted in the following ways: 1) the outer-layer, poly(BVSiBr<SUB>2</SUB>), was chemically trapped with a methylviologen radical, MV<SUP>\underset.+</SUP>, produced photochemically in an illumination cell and transferred to the electrochemical cell, 2) the outer-layer was photochemically trapped by UV irradiation in the presence of photosensitive alcohols (<I>i</I>-PrOH and EtOH) and 3) by photochemical trapping with tris(2,2′-bipyridine)ruthenium and triethanolamine. The 1st and the 2nd methods yielded results expressed by cyclic voltammograms showing an accumulation of poly(BVSi<SUP>\underset.+</SUP>), that is, a storage of optical energy in the outer-layer. The result of the 3rd method was negative.

• 公益社団法人 日本化学会の論文

著者

• Kanda Seiichi

  Department of Applied Chemistry, Faculty of Engineering, The University of Tokushima

• Murray Royce

  The Kenan Laboratory of Chemistry, University of North Carolina

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