Electrochemical studies of the Co(III)/Co(II)(dbbip)2 redox couple as a mediator for dye-sensitized nanocrystalline solar cells
✍ Scribed by Petra J. Cameron; Laurence M. Peter; Shaik M. Zakeeruddin; Michael Grätzel
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 214 KB
- Volume
- 248
- Category
- Article
- ISSN
- 0010-8545
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✦ Synopsis
The electrochemical properties of the redox mediator Co(III)/Co(II)(dbbip) 2 (dbbip = 2,6-bis(1 -butylbenzimidazol-2 -yl)pyridine) in a mixed acetonitrile/ethylene carbonate solvent have been studied by a range of techniques in order to determine the rate constants for electron transfer and the diffusion coefficients of the Co(II) and Co(III) species. Platinum, gold, fluorine-doped tin oxide (FTO) and compact TiO 2 layers were used as electrode materials. The results have been used to predict the limitations imposed on the performance of dye-sensitized nanocrystalline cells by the electron transfer kinetics and mass transport properties of the redox mediator. The Co(III)/Co(II) redox mediator is compared with the conventional triiodide/iodide redox system used in high performance dye-sensitized solar cells.