Chronoamperometric determination of diffusion coefficients of ferrocene in ionic liquids mixed with CO2 at high pressures

Guo, Yanli; Kanakubo, Mitsuhiro; Kodama, Daisuke; Nanjo, Hiroshi

doi:10.1016/j.jelechem.2009.11.030

Cited by 10 publications

(6 citation statements)

References 40 publications

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“…Under a CO 2 atmosphere in [BMMIM][BF 4 ], the acetophenone reduction peak current increased significantly and the peak potential shifted positively from −2.32 V to −2.27 V. It has been reported that the presence of CO 2 can decrease the viscosity of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 35,36 so it is tempting to propose that the same effect increases the diffusion coefficient of the electroactive species in this case. However, the fact that the oxidation and reduction peak currents simultaneously measured for the Fc + / Fc process are virtually identical under a N 2 or CO 2 atmosphere rules out this possibility.…”

Section: Electrochemistry Of Acetophenone In Dry [Bmmim][bf 4 ]mentioning

confidence: 99%

Electrocarboxylation of acetophenone in ionic liquids: the influence of proton availability on product distribution

et al. 2014

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Section: Electrochemistry Of Acetophenone In Dry [Bmmim][bf 4 ]mentioning

confidence: 99%

Electrocarboxylation of acetophenone in ionic liquids: the influence of proton availability on product distribution

et al. 2014

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“…While a great deal of knowledge has been obtained regarding the behaviour of RTIL electrolytes, much of the work done to date has involved the use of one or two redox mediators (particularly ferrocene) and a relatively small number of ''RTIL families''. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] However, one must be careful when drawing conclusions from the study of distinct RTIL families; trends are often found within RTIL families that do not apply across families. 24 For example, a linear correlation exists between the molar surface energy and enthalpy of vaporisation of the imidazolium bis[(trifluoromethane)sulfonyl]imide, [C n C 1 Im][Tf 2 N], RTIL family (where n = 2-8) but this trend is not observed in [C n C 1 Im][BF 4 ] RTILs.…”

Section: Introductionmentioning

confidence: 99%

On the diffusion of ferrocenemethanol in room-temperature ionic liquids: an electrochemical study

Lovelock

Ejigu

Loh

et al. 2011

Phys. Chem. Chem. Phys.

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The electrochemical behaviour of ferrocenemethanol (FcMeOH) has been studied in a range of room-temperature ionic liquids (RTILs) using cyclic voltammetry, chronoamperomery and scanning electrochemical microscopy (SECM). The diffusion coefficient of FcMeOH, measured using chronoamperometry, decreased with increasing RTIL viscosity. Analysis of the mass transport properties of the RTILs revealed that the Stokes-Einstein equation did not apply to our data. The "correlation length" was estimated from diffusion coefficient data and corresponded well to the average size of holes (voids) in the liquid, suggesting that a model in which the diffusing species jumps between holes in the liquid is appropriate in these liquids. Cyclic voltammetry at ultramicroelectrodes demonstrated that the ability to record steady-state voltammograms during ferrocenemethanol oxidation depended on the voltammetric scan rate, the electrode dimensions and the RTIL viscosity. Similarly, the ability to record steady-state SECM feedback approach curves depended on the RTIL viscosity, the SECM tip radius and the tip approach speed. Using 1.3 μm Pt SECM tips, steady-state SECM feedback approach curves were obtained in RTILs, provided that the tip approach speed was low enough to maintain steady-state diffusion at the SECM tip. In the case where tip-induced convection contributed significantly to the SECM tip current, this effect could be accounted for theoretically using mass transport equations that include diffusive and convective terms. Finally, the rate of heterogeneous electron transfer across the electrode/RTIL interface during ferrocenemethanol oxidation was estimated using SECM, and k(0) was at least 0.1 cm s(-1) in one of the least viscous RTILs studied.

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“…However, temperature changes may also give rise to other factors that will have the opposite effect, for example, Guo et al have reported that ferrocene molecules could diffuse faster in ionic liquids mixed with CO 2 at lower temperatures but higher pressures because of the higher solubility of CO 2 . 35 Based on our earlier discussion of interfacial tension effects, decreasing diffusion coefficients of nicotine may cause by increasing interfacial tension with temperature increase. 31 In previous research, Bagalkot and Hamouda indicated that for CO 2 diffusing into a hydrocarbon drop in a high-density CO 2 system, diffusion coefficient increased with pressure because of lower interfacial tension, which assisted mass transfer of CO 2 .…”

Section: Dmentioning

confidence: 99%

Temperature and Salting out Effects on Nicotine Dissolution Kinetics in Saline Solutions

Chen

Papadopoulos

2020

ACS Omega

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The dissolution rate of nicotine in aqueous solutions of sodium chloride (NaCl) was investigated at room temperature and 70 °C by quantitatively visualizing the shrinkage rate of microscopic nicotine droplets. Four different salt concentrations were used: 15 wt % (3.0 M), 20 wt % (4.3 M), 25 wt % (5.7 M), and the saturation NaCl concentration of 26 wt % (6.0 M). These results, together with the Epstein–Plesset mathematical model, provided estimates of nicotine’s diffusion coefficient in the NaCl solutions. At room temperature, the dissolution rate of nicotine and diffusion coefficients decreased with increasing NaCl concentration, and below 15 wt %, the dissolution kinetics were too fast to measure accurately via optical microscopy. At the higher temperature of 70 °C, nicotine’s dissolution rate showed a decrease for 15 and 20% NaCl. However, at near-saturation 25% NaCl, nicotine’s dissolution rate did not exhibit significant change for the two temperatures, and for 26%, dissolution was higher at 70 °C than at room temperature.

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Chronoamperometric determination of diffusion coefficients of ferrocene in ionic liquids mixed with CO2 at high pressures

Cited by 10 publications

References 40 publications

Electrocarboxylation of acetophenone in ionic liquids: the influence of proton availability on product distribution

Electrocarboxylation of acetophenone in ionic liquids: the influence of proton availability on product distribution

On the diffusion of ferrocenemethanol in room-temperature ionic liquids: an electrochemical study

Temperature and Salting out Effects on Nicotine Dissolution Kinetics in Saline Solutions

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