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1

Analysis of the parameters of supercapacitors containing polypyrrole and its derivatives

Gocki M., Nowak A.J., Karoń K.

Archives of Materials Science and Engineering

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2023

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Vol. 120, nr 1

5--14

EN

Purpose: Investigation of some parameters of energy storage devices (so-called supercapacitors) in which the structures of selected conductive polymers were implemented. Researchers were interested in the relationship between the parameters of the supercapacitor and the molecular structure of the conductive polymer used as the electrode material. Design/methodology/approach: The polypyrrole and its derivatives were produced by an electropolymerization process performed with cyclic voltammetry. During the research, polymer supercapacitors were created containing collectors made of ITO plates. Measurement of device parameters using cyclic voltammetry and chronopotentiometry. In addition, the devices use polymer electrolytes based on poly (methyl methacrylate) (PMMA). Findings: Devices containing polypyrrole have the best electrochemical parameters, while supercapacitors containing poly (phenylpyrrole) have the lowest parameters. This parameter is due to the high hindrance in the poly(phenylpyrrole) molecule in the form of an aromatic ring. Research limitations/implications: The most significant limitation of the devices is their durability due to the low strength of the conductive layer on ITO plates. This layer was easily degraded with too many test cycles. Practical implications: It was confirmed that polypyrrole and its derivatives could be used as electrode materials in energy storage devices. Originality/value: One of the few studies that allow the evaluation of the molecular structure of polypyrrole and its derivatives as electrode material in symmetrical supercapacitors.

2

Chronopotentiometric characterization of electrodialysis module

Koter S., Guler C., Koter I.

Architecture Civil Engineering Environment

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2016

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Vol. 9, no. 3

129--133

EN

Classical and chronopotentiometric characterization of the electrodialysis module at the same concentrations of diluate and concentrate was performed. Limiting current was determined from the Cowan-Brown plot, the current efficiency and the mean transport number of counterions – from the concentration changes on the exit of the ED module. The electric resistance was determined from the chronopotentiometric curve. For electric currents higher than the limiting one, the transition time (inflection point) was observed. Thus, having such curves for different values of electric current, the limiting current can be roughly estimated. To estimate a mean counterion transport number from the transition time, an equation, analogous to the Sand equation, should be developed which include both types of membrane.

PL

Przedstawiono krzywe chronopotencjometryczne elektrodialitycznego modułu membranowego, Stwierdzono, że na ich podstawie można określić, czy zastosowane natężenie prądu nie przekracza prądu granicznego, a tym samym w przybliżeniu określić wartość tego ostatniego. Oszacowana na podstawie kilku krzywych chronopotencjo-metrycznych wartość prądu granicznego jest zgodna z wyznaczoną wartością na podstawie wykresu Cowana-Browna. Obserwowane na krzywych punkty przegięcia można wykorzystać do wyznaczenia średniej liczby przenoszenia przeciwjonów. W tym celu należy wyprowadzić równanie analogiczne do wzoru Sanda, które by brało pod uwagę oba chronopotencjometryczne pozwoliły na proste i szybkie wyznaczenie oporu elektrycznego modułu.

3

Elektrochemiczne wodorowanie kompozytów proszkowych LaCo4,8Al0,2 i LaCo4,8Al0,1Li0,1 w roztworze 6M KOH

Giza K., Bala H.

Ochrona przed Korozją

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2010

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nr 11

555-557

PL

Przedstawiono charakterystykę elektrochemiczną kompozytów proszkowych stopów LaCo4,8Al0,2 i LaCo4,8Al0,1Li0,1 spajanych parafiną, pod kątem ich zdolności do absorpcji wodoru wydzielanego elektrolitycznie. Elektrochemiczne badania ładowania/ rozładowania wskazują, że stop LaCo4,8Al0,1Li0,1 pochłania wyraźnie większe ilości wodoru w stosunku do stopu LaCo4,8Al0,2.

EN

Electrochemical characteristics of LaCo4,8Al0,2 and LaCo4,8Al0,1Li0,1 powders consolidated with paraffin in view of their ability to absorption of electrolytic hydrogen are presented. The electrochemical charging/ discharging experiments have shown that the LaCo4,8Al0,1Li0,1 alloy absorb distinctly larger quantities of hydrogen compared with the LaCo4,8Al0,2 alloy.

4

Voltammetry of immobilized microparticles : statistical evaluation

Pikna Ľ., Fečková Z., Lux L.

Chemia Analityczna

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2004

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Vol. 49, No. 6

825-832

EN

Dissolution of Fe powder particles immobilized on paraffin impregnated graphite electrode was investigated under galvanostatic conditions. The aim of the experiments was concentrated on quantitative aspects of experimental technique. Reproducibility, repeatability, coverage of the electrode surface were evaluated and calculated according to a simplified model. Influence of the electrode surface area and dissolution current on the above parameters was evaluated and the experimental results were confronted with the suggested model.

PL

Badano rozpuszczanie cząsteczek pudru Fe unieruchomionych na impregnowanym parafiną graficie w warunkach galwanostatycznych. Celem eksperymantów było określenie ilościowych aspektów tej techniki. Obliczono odtwarzalność, powtarzalność i pokrycie powierzchni elektrody używając prostego modelu. Uzyskane wyniki, dotyczące prądów utleniania, porównano z przewidywaniami zaproponowanego modelu.