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Betalain pigments for dye-sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
28296 44068 2008 9 PDF Available
Title
Betalain pigments for dye-sensitized solar cells
Abstract

A dye-sensitized solar cell based on natural betalain pigments from red beet roots is described. Reddish-purple betanin is an easily oxidized, water-soluble pigment with strong visible light absorption, having a maximum molar absorptivity of about 65,000 M−1 cm−1at 535 nm. A photoanode was fabricated from nanocrystalline TiO2 on transparent conductive glass, treated with ethanolic HCl solution, then sensitized with raw beet extract or a betanin solution from which yellow betaxanthin pigments were removed by column chromatography. The betanin-sensitized film when employed in a dye-sensitized solar cell gave a maximum photocurrent of 2.42 mA/cm2 and open-circuit photovoltage of 0.44 V in the presence of methoxypropionitrile containing I−/I3− redox mediator. Photocurrents and photovoltages are also reported for the DSSC sensitized with yellow betaxanthin and a brown betalain-derived oxidation product. Wavelength-dependent incident photon-to-electron conversion efficiencies (IPCEs) show maximum values of 14% and 8% for betaxanthin- and betanin-based solar cells, respectively.

Keywords
Dye-sensitized solar cell; Plant pigments; Betalains
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 195, Issue 1, 5 March 2008, Pages 72–80
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us