Impedance of porous Au based electrodes

Jurczakowski, Rafał; Hitz, C.; Lasia, Andrzej

doi:10.1016/j.jelechem.2004.01.008

Cited by 131 publications

(117 citation statements)

References 22 publications

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“…The utility for qualitatively characterize the microstructure is already introduced and in the present study we propose an industrially applicable method, suited for quantitative characterization of different microstructures. EIS is very sensitive to the geometry of the working electrodes 16 , therefore it was successfully utilized to characterize the roughness of surfaces 17 and even to determine the pore size and shape in the case of porous electrodes [18][19][20] . Electrochemical etching forms complex surface determined by the microstructure of samples depending on the etching time.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the microstructure of tin-silver lead free solder

Hurtony

Szakál

Almásy

et al. 2016

Journal of Alloys and Compounds

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Reliability and lifetime are the two most relevant design considerations in the production of safety critical assemblies. For example in a modern automobile dozens of electronic assemblies are integrated in which thousands of solder joints are mounting the electronic components to the printed circuit boards. There exists no standardised and universal observation method for characterising the fine microstructure of such solder joints. Previously we have developed a new method for the quantitative characterization of lead-free solder alloys and in present study the validity of the proposed method is demonstrated. Microstructure of Sn-3.5Ag lead free solder alloy was investigated by electrochemical impedance spectroscopy. Solder samples were solidified with different cooling rates in order to induce differences in the microstructure. Microstructure of the ingots was revealed by selective electrochemical etching. Electrochemical impedance spectra (EIS) were measured before and after the selective etching process. The complex impedance spectra contain information about microstructure of the solder alloys. Comparison and modelling of two EIS spectra allowed obtaining a characteristic parameter of surface structure of the etched specimens. The EIS measurements were complemented with small angle neutron scattering measurements and scanning electron microscopy, in order to correlate the EIS parameter with the magnitude of the interface of the β-Sn and Ag3Sn phases.

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Section: Introductionmentioning

confidence: 99%

Characterization of the microstructure of tin-silver lead free solder

Hurtony

Szakál

Almásy

et al. 2016

Journal of Alloys and Compounds

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“…It is also noteworthy that no kinetic semicircles were observed. However, this could be attributed to the fast reaction kinetics [61]. Despite the fact that vanadium heteropolytungstate redox transitions (involving electron transfers between W (V) , W (VI) ) appear in the negative range of potentials, the electrolyte decomposition has not been observed.…”

Section: Dynamics Of Charge Transportmentioning

confidence: 99%

“…Seven different potential values were applied to the modified electrodes, namely 0.6, 0.48, 0.2, 0.4, 0.0, −0.2, and −0.4 V vs SCE. Using these data, the specific capacitances were estimated in similar manner as described previously for double layer capacitance [61]. Inset b in Fig.…”

Section: Dynamics Of Charge Transportmentioning

confidence: 99%

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Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Sosnowska

Góral-Kurbiel

Skunik-Nuckowska

et al. 2013

J Solid State Electrochem

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Preparation and electrochemical behavior of new hybrid materials composed of multi-walled carbon nanotubes (CNTs) that were derivatized with poly(diallyldimethylammonium) chloride and modified with vanadium-mixed addenda Dawson-type heteropolytungstate, [P 2 W 17 VO 62 ] 8− , is described here. These nanostructured composite systems exhibited fast dynamics of charge propagation. They were characterized by the transport (effectively diffusional) kinetic parameter of approximately 8×10 −8 cm −2 s −1/2 and the specific capacitance parameter of 82 F g −1 (at the charging/discharging current of 200 mA g −1 ). The latter parameter for bare CNTs was found to be only 50 F g −1 under analogous conditions. These observations were based on the results of galvanostatic charging-discharging, cyclic voltammetric, and AC impedance spectroscopic measurements. The improved capacitance properties were attributed to the systems' pseudocapacitive features originating from the fast redox transitions of the [P 2 W 17 VO 62 ] 8− polyanions. In addition to the fast redox conduction, the proposed organicinorganic hybrid materials exhibited interesting electrocatalytic activity toward reduction of bromate in the broad concentration range (sensitivity, 0.24 mA cm −2 mmol −1 dm 3 ).

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“…По результатам измерения импеданса гладкого электрода, который наряду с емкостью двойного слоя гладкой поверхности включает реактивную составляющую, обусловленную реакцией, нахо дили емкость его двойного слоя (С гл ) и с учетом площади (S гл ) определяли удельную емкость [6,7]:…”

Section: определение поверхности дендритного осадка цинка методом импunclassified