Adsorption of sodium dodecyl sulfate on the bismuth (111), (001) and planes

Kasuk, Heili; Nurk, Gunnar; Lust, Enn

doi:10.1016/j.jelechem.2007.10.012

Cited by 4 publications

(6 citation statements)

References 58 publications

(366 reference statements)

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“…39,47,48 This phenomenon has been discussed theoretically by Kornyshev et al 11,18 The frequency factor T = L eff /D eff in Z GFW is nearly independent of E ͑L eff and D eff are the effective diffusion layer thickness and diffusion coefficient, respectively͒.…”

Section: F84mentioning

confidence: 83%

“…[41][42][43][44] ͒ Only at f Ͻ 0.1 Hz are the values of ␦ somewhat less negative than Ϫ85°, indicating the deviation of our system from the ideally capacitive electrode model [41][42][43][44] because of the partial charge transfer at the electrode ͉ RTIL interface like at a metal ͉ solvent + electrolyte interface. [31][32][33][34][35][36][37]39,[45][46][47][48][49][50] According to the experimental results, only at E Յ −1.1 V are there maxima in the log͉ZЉ͉ vs log f plots at frequency f max obtaining the characteristic time constant max = ͑2f max ͒ −1 for cathodic process͑es͒ at the Bi͑111͒ ͉ EMImBF 4 interface. [45][46][47][48][49][50] A comparison with our previous results for the Bi ͉ LiBF 4 + ethanol interface 26,28 shows that the electroreduction of BF 4 − anions at the Bi͑111͒ ͉ EMImBF 4 interface is possible, but the rate of the electroreduction process is small.…”

Section: F84mentioning

confidence: 99%

“…[31][32][33][34][35][36][37]39,[45][46][47][48][49][50] According to the experimental results, only at E Յ −1.1 V are there maxima in the log͉ZЉ͉ vs log f plots at frequency f max obtaining the characteristic time constant max = ͑2f max ͒ −1 for cathodic process͑es͒ at the Bi͑111͒ ͉ EMImBF 4 interface. [45][46][47][48][49][50] A comparison with our previous results for the Bi ͉ LiBF 4 + ethanol interface 26,28 shows that the electroreduction of BF 4 − anions at the Bi͑111͒ ͉ EMImBF 4 interface is possible, but the rate of the electroreduction process is small. Electroreduction of trace water or O 2 residuals in RTIL is also possible at E Յ −1.1 V, but on the basis of the data for the nanoporous carbon ͉ EMImBF 4 interface 15 within the region of ideal polarizability ⌬E Ն 3.2 V, it could be supposed that the electrochemical surface activity of the Bi͑111͒ electrode is more important than the influence of residual water ͑Ͻ100 ppm͒ in the RTIL studied.…”

Section: F84mentioning

confidence: 99%

“…5͒ have been fitted to the experimental spectra using the nonlinear leastsquares minimization method. [41][42][43][44][45][46][47][48][49][50][51] Visual analysis of the Nyquist and Bode dependences indicates that, to a first approximation, the simple three-element equivalent circuit ͑EC͒ A in Fig. 5 can be used for calculation of the theoretical spectrum within the region of −0.8 Ͻ E Ͻ −0.1 V. Concordance of calculated with experimental impedance spectra was estimated mainly by the value of the 2 function being higher than 6 ϫ 10 −3 ͑calculated using 80 points for all fittings͒.…”

Section: F84mentioning

confidence: 99%

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Electrical Double Layer Capacitance at Bi(111)∣1-Ethyl-3-methylimidazolium Tetrafluoroborate Interface as a Function of the Electrode Potential

Siinor¹,

Lust²,

Lust³

2010

J. Electrochem. Soc.

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The influence of the electrode potential on the Bi͑111͒ ͉ 1-ethyl-3-methylimidazolium tetrafluoroborate interface has been studied by cyclic voltammetry and electrochemical impedance. The weak deviation of the system from capacitive behavior for the ideally flat electrode has been established within the moderate electrode potential region from Ϫ0.9 to Ϫ0.1 V vs Ag ͉ AgCl in 1-ethyl-3-methylimidazolium tetrafluoroborate. The parallel faradaic processes are possible outside the potential region from Ϫ0.9 to Ϫ0.1 V. The results obtained for the Bi͑111͒ ͉ 1-ethyl-3-methylimidazolium tetrafluoroborate interface have been compared with those for gold, mercury, and glassy carbon electrodes.Recent research activity of room-temperature ionic liquids ͑RTILs͒, initiated by their potential applications in various modern electrochemical power systems, created interest in the interface between ionic liquids and metal 1-12 as well as carbon, including nanoporous carbon electrodes. [13][14][15] Despite the extensive discussions about whether the electrical double layer ͑edl͒ at the metal ͉ RTIL interface is fundamentally different from or similar to that extensively studied at the metal ͉ electrolyte solution interface, 11,12,[15][16][17][18] our knowledge of the metal ͉ RTIL interface is still sketchy because there is no systematic impedance and capacitance characteristics for edl in single-crystal electrodes. Detailed theoretical papers have been written by Kornyshev et al.;11,12,18 however, the verification of these models needs a detailed systematic analysis of experimental data not existing at present.The electrical double layer capacitor ͑EDLC͒ characteristics 13-15,19-27 have been discussed and it has been established that, due to the limited solubility of salts ͑from 1.5 to 1.8 M͒, a decrease in electrolyte conductivity takes place, caused by the adsorption of a large amount of ions at the electrodes with a high specific surface area. However, there are some possibilities to increase the concentration of ions by using RTILs ͑with molar concentration 4-6 M͒ in EDLCs instead of the traditional electrolyte solution. [19][20][21][22][23][24][25][26][27] There are only few publications devoted to edl capacitance and impedance measurements on the geometrically flat, well-defined electrodes in RTILs. 28-31 Surprisingly low series capacitance ͑C s ͒ values ͑from 1 to 8 F cm −2 ͒ have been calculated for various metal electrodes, which is not easy to explain theoretically. 11,12,[16][17][18] Such low values of C s probably indicate surface blocking of the electrode surface by the irreversible adsorption of contaminants. The adsorption/ desorption kinetics of RTIL ions has not been studied systematically; 31 however, the kinetics of probable electrostatic adsorption with partial charge transfer and distribution of ions near the electrode surface, over screening, and lattice saturation effects 11,18 are extremely important for engineering the high power density supercapacitors. [13][14][15][19][20][21][22][23][24][25][26][27] Anoth...

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Section: F84mentioning

confidence: 83%

Section: F84mentioning

confidence: 99%

Section: F84mentioning

confidence: 99%

Section: F84mentioning

confidence: 99%

See 2 more Smart Citations

Electrical Double Layer Capacitance at Bi(111)∣1-Ethyl-3-methylimidazolium Tetrafluoroborate Interface as a Function of the Electrode Potential

Siinor¹,

Lust²,

Lust³

2010

J. Electrochem. Soc.

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“…The EIS data was satisfactorily fitted with the modified Dolin-Ershler equivalent circuit model (Fig. 4b) [62], judged by the values of the pseudo 2 and relative % errors (Table 1) as well as the goodness of fit (Fig. 4a) wherein the true capacitance (C dl ) is replaced by the constant phase element (CPE).…”

Section: Comparative Electron Transport Propertiesmentioning

confidence: 99%

Probing the electrochemical behaviour of SWCNT–cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions

Adekunle

Pillay

Ozoemena

2010

Electrochimica Acta

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a b s t r a c tThe electrochemical decoration of edge plane pyrolytic graphite electrode (EPPGE) with cobalt and cobalt oxide nanoparticles integrated with and without single-walled carbon nanotubes (SWCNTs) is described. Successful modification of the electrodes was confirmed by field emission scanning electron microscopy (FESEM), AFM and EDX techniques. The electron transfer behaviour of the modified electrodes was investigated in [Fe(CN)6] 3−/4− redox probe using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) and discussed. The study showed that cobalt nanoparticles modified electrodes exhibit faster electron transfer behaviour than their oxides. The catalytic rate constant (K) obtained at the EPPGE-SWCNT-Co for nitrite at pH 7.4 and 3.0 are approximately the same (∼3 × 10 4 cm 3 mol −1 s −1 ) while the limits of detection (LoD = 3.3ı/m) are in the M order. From the adsorption stripping voltammetry, the electrochemical adsorption equilibrium constantˇwas estimated as (13.0 ± 0.1) × 10 3 M −1 at pH 7.4 and (56.7 ± 0.1) × 10 3 M −1 at pH 3.0 while the free energy change ( G • ) due to the adsorption was estimated as −6.36 and −10.00 kJ mol −1 for nitrite at pH 7.4 and 3.0, respectively.

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Teaching electrochemistry and student participation in the development of sustainable electricity generation/storage devices at the Institute of Chemistry of the University of Tartu

Ers,

Pikma,

Palm

et al. 2023

J Solid State Electrochem

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Research-based education is a long-standing tradition at the University of Tartu (UT). Basic knowledge of electrochemistry and the principles of developing electrochemical devices have been taught and implemented at UT since 1960. For instance, during then, self-made alkaline electrolysers were used to generate hydrogen. The hydrogen was further purified and used to saturate aqueous and non-aqueous electrolytes. The fundamental electrochemical research has formed a solid background on which the development of supercapacitors and Na+-ion or Li+-ion batteries is based today. Since 1991, the Ph.D., MSc and undergraduate students have investigated the properties of high surface–area carbon materials in non-aqueous electrolytes to develop energy conversion and storage devices with high energy and power density. Moreover, porous thin-film complex metal hydride–based hydrogen storage devices are also under study. The research of solid oxide fuel cells (SOFC) and polymer electrolyte membrane fuel cells (PEMFC) began at the UT in 2001 and 2010, respectively. Based on the collected knowledge, a sustainable green electricity and hydrogen generation-storage complex (GEHGSC) was constructed, consisting of solar cells and fuel cells for electricity generation, batteries for storage and electrolysers for hydrogen generation. The main aim of GEHGSC is to educate students, young scientists and local authorities specialized in sustainable energy technologies and applied electrochemistry. Electrolyzed hydrogen has been used for experimental testing of SOFC and PEMFC, produced at the Institute of Chemistry. The 300 bar hydrogen compressor has been installed, and thereafter, the PEMFC-powered self-driving car Iseauto, completed by contract for Auve Tech OÜ, has been fuelled with hydrogen produced by GEHGSC.

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Adsorption of sodium dodecyl sulfate on the bismuth (111), (001) and planes

Cited by 4 publications

References 58 publications

Electrical Double Layer Capacitance at Bi(111)∣1-Ethyl-3-methylimidazolium Tetrafluoroborate Interface as a Function of the Electrode Potential

Electrical Double Layer Capacitance at Bi(111)∣1-Ethyl-3-methylimidazolium Tetrafluoroborate Interface as a Function of the Electrode Potential

Probing the electrochemical behaviour of SWCNT–cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions

Teaching electrochemistry and student participation in the development of sustainable electricity generation/storage devices at the Institute of Chemistry of the University of Tartu

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