Počet záznamů: 1
Alternative bases to 4-tert-butylpyridine for dye-sensitized solar cells employing copper redox mediator
- 1.
SYSNO ASEP 0488452 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Alternative bases to 4-tert-butylpyridine for dye-sensitized solar cells employing copper redox mediator Tvůrce(i) Ferdowsi, P. (IR)
Saygili, Y. (CH)
Zakeeruddin, S. M. (CH)
Mokhtari, J. (IR)
Grätzel, M. (CH)
Hagfeldt, A. (CH)
Kavan, Ladislav (UFCH-W) RID, ORCIDZdroj.dok. Electrochimica acta. - : Elsevier - ISSN 0013-4686
Roč. 265, MAR 1 (2018), s. 194-201Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova electrolytes ; efficient ; cathodes ; shuttle ; Dye-sensitized solar cells ; Copper(II/I) redox mediators ; Pyridine bases ; Electrochemical characterization Vědní obor RIV CG - Elektrochemie Obor OECD Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) CEP GA13-07724S GA ČR - Grantová agentura ČR Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000425751600023 EID SCOPUS 85041457942 DOI 10.1016/j.electacta.2018.01.142 Anotace Novel facile synthetic protocol is developed to prepare electrochemically and optically clean Cu(tm-by)(2)TFSI and Cu(tmby)(2)TFSI2 in a mixture (tmby = 4,4,6,6-tetramethyl-2,2-bipyridine, TFSI = tri-fluoromethylsufonylimide). This pure Cu(II/I) redox mediator exhibits improved charge-transfer rate at the counterelectrode (PEDOT) and faster diffusion transport in the solution. Four pyridine derivatives: 4-tert-butylpyridine, 2,6-bis-tert-butylpyridine, 4-methoxypyridine and 4-(5-nonyl)pyridine are evaluated as electrolyte additives. Base-specific electrochemical properties of the redox mediator are found for Cu(tmby)(2)(2+)/(+), but not for Co(bpy)(3)(3+)/(2+) which is used as control system. Due to steric hindrance, 2,6-bis-ert-butylpyridine has the smallest influence on the mediator's electrochemistry, but is also ineffective for the V-OC enhancement through TiO2 conduction band upshift. Charge-transfer rates at PEDOT surface and diffusion resistances correlate with the basicity (pK(a)) of the used pyridine derivatives. The dye (Y123)-sensitized solar cells are evaluated by solar conversion performance in addition to electron lifetime, charge extraction and long-term stability tests. The optimization of pyridine bases for the Cu-mediated solar cells represents interplay of basicity and coordination ability. In turn, this allows for tuning of the charge transfer rate at counterelectrode and the mass transport in the electrolyte solution. The 4-(5-nonyl) pyridine is outperforming all the remaining bases in performance metrics of the corresponding solar cells. (c) 2018 Elsevier Ltd. All rights reserved. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2019
Počet záznamů: 1