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Novel highly active Pt/graphene catalyst for cathodes of Cu(II/I)-mediated dye-sensitized solar cells

SYSNO ASEP	0481279
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Novel highly active Pt/graphene catalyst for cathodes of Cu(II/I)-mediated dye-sensitized solar cells
Author(s)	Kavan, Ladislav (UFCH-W)_{RID, ORCID} Krýsová, Hana (UFCH-W)_{RID, ORCID} Janda, Pavel (UFCH-W)_{RID, ORCID} Tarábková, Hana (UFCH-W)_{RID, ORCID} Saygili, Y. (CH) Freitag, M. (CH) Zakeeruddin, S. M. (CH) Hagfeldt, A. (CH) Grätzel, M. (CH)
Source Title	Electrochimica acta. - : Elsevier - ISSN 0013-4686 Roč. 251, OCT 2017 (2017), s. 167-175
Number of pages	9 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	graphene ; platinum ; cathode catalyst ; dye sensitized solar cell ; Cu-complexes
Subject RIV	CG - Electrochemistry
OECD category	Physical chemistry
R&D Projects	GA13-07724S GA ČR - Czech Science Foundation (CSF)
Institutional support	UFCH-W - RVO:61388955
UT WOS	000413004200018
EID SCOPUS	85028297618
DOI	10.1016/j.electacta.2017.08.080
Annotation	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. (C) 2017 Elsevier Ltd. All rights reserved.
Workplace	J. Heyrovsky Institute of Physical Chemistry
Contact	Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
Year of Publishing	2018

Number of the records: 1