Photogalvanic cells XIII: New methylene blue NN

The suitability of new methylene blue NN as a dye for a photogalvanic cell for solar energy conversion is investigated. At concentrations as low as 10 −4 mol dm −3 there is extensive dimerization; however, the action spectrum shows that the photoredox reactin is only driven by the monomer. Data for...

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Bibliographic Details
Published inJournal of photochemistry Vol. 15; no. 4; pp. 321 - 328
Main Authors Albery, W.John, Foulds, Andrew W.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1981
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Summary:The suitability of new methylene blue NN as a dye for a photogalvanic cell for solar energy conversion is investigated. At concentrations as low as 10 −4 mol dm −3 there is extensive dimerization; however, the action spectrum shows that the photoredox reactin is only driven by the monomer. Data for the photoelectrochemical quantum efficiency in the concentration range 10 – 25.0 μmol dm −3 are explained by dimerization together with diffusion-controlled self-quenching by both monomers and dimers. These results show that new methylene blue NN is unsuitable and that self-quenching may be a serious problem for other iron—thiazine systems.
ISSN:0047-2670
DOI:10.1016/0047-2670(81)80006-8