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Impedance Characteristics of Transparent GNP-Pt Ink Catalysts for Flexible Dye Sensitized Solar Cells

J. Baker, J. D. McGettrick, D. T. Gethin, T. M. Watson, David Gethin Orcid Logo, Trystan Watson Orcid Logo, James McGettrick Orcid Logo, Jenny Baker Orcid Logo

Journal of the Electrochemical Society, Volume: 162, Issue: 8, Pages: H564 - H569

Swansea University Authors: David Gethin Orcid Logo, Trystan Watson Orcid Logo, James McGettrick Orcid Logo, Jenny Baker Orcid Logo

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DOI (Published version): 10.1149/2.0961508jes

Abstract

By thermally reducing platinum onto the surface of Graphene Nanoplatelet (GNP) particles the catalytic activity of the iodide/triiodide reaction in dye-sensitized solar cells (DSC) can be improved significantly. The GNP-Pt particles can be used to formulate a highly catalytic yet transparent ink, wh...

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Published in: Journal of the Electrochemical Society
ISSN: 0013-4651
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa22358
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Abstract: By thermally reducing platinum onto the surface of Graphene Nanoplatelet (GNP) particles the catalytic activity of the iodide/triiodide reaction in dye-sensitized solar cells (DSC) can be improved significantly. The GNP-Pt particles can be used to formulate a highly catalytic yet transparent ink, which can be deposited by a number of different technologies such as flexographic printing, K-bar, slot-die and spin coating. The catalytic performance of the ink has been characterized using impedance spectroscopy, the impedance spectra show a high frequency impedance curve often seen in carbon electrodes. The origin of this impedance has a number of opposing hypotheses which are critically examined. The data supports the hypothesis that the high frequency curve is due to a contact resistance between the GNP-Pt ink and the FTO. In addition to the high frequency curve, a previously unresolved low frequency impedance is identified. When fabricated into DSCs the ink catalyst demonstrates cell efficiencies up to 5.2% and is shown to have a similar performance to conventional sputtered platinum when used in a reverse illuminated DSC (through the counter electrode). The first flexible reverse illuminated DSC with a GNP-Pt ink catalyst, suitable for roll-to-roll deposition is reported with an efficiency of 2.6%.
Keywords: catalyst, dye-sensitized, flexible, graphene, impedence, ink, platinum
College: College of Engineering
Issue: 8
Start Page: H564
End Page: H569