Alternative bases to 4-tert-butylpyridine for dye-sensitized solar cells employing copper redox mediator

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F18%3A00488452" target="_blank" >RIV/61388955:_____/18:00488452 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.electacta.2018.01.142" target="_blank" >http://dx.doi.org/10.1016/j.electacta.2018.01.142</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2018.01.142" target="_blank" >10.1016/j.electacta.2018.01.142</a>

Result language

angličtina

Original language name

Alternative bases to 4-tert-butylpyridine for dye-sensitized solar cells employing copper redox mediator

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/GA13-07724S" target="_blank" >GA13-07724S: Materials engineering towards Innovative Graetzel solar cells</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Electrochimica acta

ISSN

0013-4686

e-ISSN

—

Volume of the periodical

265

Issue of the periodical within the volume

MAR 1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

194-201

UT code for WoS article

000425751600023

EID of the result in the Scopus database

2-s2.0-85041457942