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Novel highly active Pt/graphene catalyst for cathodes of Cu(II/I)-mediated dye-sensitized solar cells
Acad Sci Czech Republ, Vvi, J Heyrovsky Inst Phys Chem, Dolejskova 3, CZ-18223 Prague 8, Czech Republic.;Swiss Fed Inst Technol, Lab Photon & Interfaces, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland..
Acad Sci Czech Republ, Vvi, J Heyrovsky Inst Phys Chem, Dolejskova 3, CZ-18223 Prague 8, Czech Republic..
Acad Sci Czech Republ, Vvi, J Heyrovsky Inst Phys Chem, Dolejskova 3, CZ-18223 Prague 8, Czech Republic..
Acad Sci Czech Republ, Vvi, J Heyrovsky Inst Phys Chem, Dolejskova 3, CZ-18223 Prague 8, Czech Republic..
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2017 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 251, p. 167-175Article in journal (Refereed) Published
Abstract [en]

Novel highly active, optically-transparent electrode catalyst containing Pt, PtOx, graphene oxide and stacked graphene platelet nanofibers is developed for a cathode of Cu(II/I)-mediated dye-sensitized solar cells. The catalyst layer is deposited on a FTO substrate, which thus becomes smoother than the parent FTO, but the button-like Pt/PtOx nanoparticles are still distinguishable. The found electrocatalytic activity for the Cu(tmby)(2)(2+/+) redox couple (tmby is 4,4', 6,6'-tetramethyl-2,2'-bipyridine) is outperforming that of alternative catalysts, such as PEDOT or platinum. Exchange current densities exceeding 20 mA/cm(2) are provided exclusively by our novel catalyst. The synergic boosting of electrocatalytic activity is seen, if we normalize it to the catalytic performance of individual components, i.e. Pt and graphene nanofibers. The outstanding properties of our cathode are reflected by the performance of the corresponding solar cells using the Y123-sensitized titania photoanode. Champion solar-conversion efficiency (11.3% at 0.1 sun) together with a fill factor of 0.783 compare favorably to all other so far reported best values for this kind of solar cells and the given experimental conditions.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2017. Vol. 251, p. 167-175
Keywords [en]
graphene, platinum, cathode catalyst, dye sensitized solar cell, Cu-complexes
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-340143DOI: 10.1016/j.electacta.2017.08.080ISI: 000413004200018OAI: oai:DiVA.org:uu-340143DiVA, id: diva2:1177961
Conference
11th International Symposium on Electrochemical Micro and Nanosystem Technologies (EMNT), AUG 17-19, 2016, Royal Belgian Inst Nat Sci, Brussels, BELGIUM
Funder
EU, Horizon 2020, 696656Available from: 2018-01-26 Created: 2018-01-26 Last updated: 2018-01-26Bibliographically approved

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Freitag, Marina

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