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Issue 1, 2013
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Aqueous dye-sensitized solar cell electrolytes based on the cobalt(ii)/(iii) tris(bipyridine) redox couple

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Abstract

In this study, we report the first application of a cobalt(II)/(III) tris(2,2′-bipyridine) based aqueous electrolyte in the fabrication of dye-sensitized solar cells. An improvement in short circuit current was observed by adjusting the concentration of polyethylene glycol in the aqueous electrolyte, which is attributed to better diffusion of the redox mediator within the electrolyte. Replacement of platinum with a composite ITO/platinum counter electrode material results in a further increase in energy conversion efficiency to above 5%. Electrochemical impedance measurements indicate a dramatic decrease in charge transport resistance at the interface between the counter electrode and aqueous electrolyte when ITO/Pt was used. Moreover, significantly improved device stability over previously reported water based DSCs under 1 sun illumination suggests that cobalt(II)/(III) tris(2,2′-bipyridine) is a promising redox mediator for highly efficient aqueous dye-sensitized solar cells.

Graphical abstract: Aqueous dye-sensitized solar cell electrolytes based on the cobalt(ii)/(iii) tris(bipyridine) redox couple

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Supplementary files

Article information


Submitted
30 Aug 2012
Accepted
08 Oct 2012
First published
08 Oct 2012

Energy Environ. Sci., 2013,6, 121-127
Article type
Paper

Aqueous dye-sensitized solar cell electrolytes based on the cobalt(II)/(III) tris(bipyridine) redox couple

W. Xiang, F. Huang, Y. Cheng, U. Bach and L. Spiccia, Energy Environ. Sci., 2013, 6, 121
DOI: 10.1039/C2EE23317G

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