Temperature dependence of the heterogeneous electron-transfer rate constant for ferrocene carboxylic acid in room temperature ionic liquids at microstructurally distinct carbon electrodes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10419919" target="_blank" >RIV/00216208:11310/20:10419919 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=KrW7cCh7t3" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=KrW7cCh7t3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jelechem.2020.114744" target="_blank" >10.1016/j.jelechem.2020.114744</a>
Alternative languages
Result language
angličtina
Original language name
Temperature dependence of the heterogeneous electron-transfer rate constant for ferrocene carboxylic acid in room temperature ionic liquids at microstructurally distinct carbon electrodes
Original language description
The apparent heterogeneous electron-transfer rate constant (k(app)(o)) for ferrocene carboxylic acid (FCA) in two room temperature ionic liquids (RTILs), 1-ethyl-3-methylimidazolium tetrafluoroborate [EMIM][BF4] and 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4], was estimated by cyclic voltammetry at boron-doped diamond (BDD), nitrogen-incorporated tetrahedral carbon thin-film (ta-C:N), and glassy carbon electrodes as a function of temperature from 298 to 338 K. Some comparison measurements were made using ferrocene (Fc). The goal was to learn how the microstructure of the different carbon electrodes influences k(app)(o) for this prototypical redox system in the RTILs. Capacitance values for BDD and ta-C:N ranged from 5 to 12 mu F cm-2 in both RTILs between -1 and 1 V vs. Ag QRE. Cyclic voltammetry measurements were made in 0.5 mmol L-1 FCA. The results demonstrate that both the carbon electrode microstructure and the RTIL's physical properties (viscosity) have a significant effect on koapp for this redox system. The diffusion coefficient, D (similar to 10(-7) cm(2) s(-1)), and k(app)(o) (similar to 10(-4) cm s(-1)) increased with increasing temperature. In both RTILs, the largest k(app)(o) and smallest E-a values were found for BDD followed by ta-C:N and GC. k(app)(o) was -2-3x larger and E-a was 2-3x lower in the less viscous [EMIM][BF4] (6-14 kJ mol(-1)) than in the more viscous [BMIM][BF4] (16-28 kJ mol(-1)) at all three electrodes. k(app)(o) for both FCA and Fc decreased in magnitude with increasing RTIL viscosity.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10406 - Analytical chemistry
Result continuities
Project
—
Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Electroanalytical Chemistry
ISSN
1572-6657
e-ISSN
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Volume of the periodical
875
Issue of the periodical within the volume
October
Country of publishing house
CH - SWITZERLAND
Number of pages
14
Pages from-to
114744
UT code for WoS article
000602423000003
EID of the result in the Scopus database
2-s2.0-85096006448