Abstract
Electrolyte modification is shown to have a substantial effect on the understanding and optimization of nCdSe ferricyanide photoelectrochemical solar cells. A series of pentacyanoferrate(II) complexes, [Fe(CN) 5L] 3− aqueous are prepared (L = CN −, NH 3, (CH 3) 2SO, H 2O, NO +, NO 2 − and Fe(CN 5 3−), and their substantial variation in photoelectrochemical activities at n-CdSe are correlated to their spectral and electrochemical properties. Investigation into ferro ferricyanide speciation showed that in the alkaline pH region where ferrocyanides are most photoelectroactive, monocation ferrocyanide and ferricyanide species dominate, MFe(CN) 6 3−/2−. These cation derivatives ( M = Mg 2+, Ca 2+, Li +, Na +, K +, Cs +, NH 4 +) are varied, and the potassium derivative was shown to result in both high photopotentials and facile kinetics.
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