Temperature dependence of the heterogeneous electron-transfer rate constant for ferrocene carboxylic acid in room temperature ionic liquids at microstructurally distinct carbon electrodes

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Temperature dependence of the heterogeneous electron-transfer rate constant for ferrocene carboxylic acid in room temperature ionic liquids at microstructurally distinct carbon electrodes

Popis výsledku v původním jazyce

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&apos;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.

Název v anglickém jazyce

Temperature dependence of the heterogeneous electron-transfer rate constant for ferrocene carboxylic acid in room temperature ionic liquids at microstructurally distinct carbon electrodes

Popis výsledku anglicky

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&apos;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10406 - Analytical chemistry

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Electroanalytical Chemistry

ISSN

1572-6657

e-ISSN

—

Svazek periodika

875

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

114744

Kód UT WoS článku

000602423000003

EID výsledku v databázi Scopus

2-s2.0-85096006448