Wyniki wyszukiwania - BazTech

1

Diethylenetriamine-assisted one-step hydrothermal synthesis of cotton-like CoS cluster for high-performance supercapacitor

Zhu J., Xiang L., Zhou Y., Yang J.

Materials Science Poland

|

2018

|

Vol. 36, No. 2

297--303

EN

Cotton-like CoS cluster has been successfully synthesized via a simple one-step hydrothermal route assisted by diethylenetriamine (DETA) as a ligand and structure-directing agent. The structure and morphology of the product were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and N2 adsorption-desorption isotherm. The CoS sample which has a hexagonal phase without any impurities possesses a microscopic morphology made by cotton-like clusters. The as-fabricated CoS as a supercapacitor electrode presents desirable supercapacitive performance with a high specific capacitance (664 F·g-1 at 0.5 A·g-1), remarkable rate capability and excellent cycling stability (85.7 % specific capacitance retention after 1000 cycles), making it applicable as an electrode for high-performance supercapacitors.

2

Synthesis and characterization of hollow V2O5 microspheres for supercapacitor electrode with pseudocapacitance

Zhang Y.

Materials Science Poland

|

2017

|

Vol. 35, No. 1

188--196

EN

Hollow V2O5 microspheres (HVOM) were fabricated using NH4VO3, ethylene glycol and carbon spheres as the starting materials by a template solvothermal approach and subsequent calcination. The morphology and composition were characterized by field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Brunauer-Emmet-Teller (BET). The results showed that the obtained HVOM were constructed from nanoparticles with rough surface. The electrochemical properties of HVOM as a supercapacitor electrode were investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). HVOM displayed excellent pseudocapacitance property and their specific capacitances were 488 F·g–1, 455 F·g–1, 434 F·g–1 and 396 F·g–1 at the current density of 0.5 A·g–1, 1 A·g–1, 2 A·g–1 and 5 A·g–1, respectively. They also exhibited an excellent energy density of 8.784 × 105 J·kg–1 at a power density of 900 W·kg–1 . The good electrochemical properties of the as-synthesized HVOM make them a promising candidate as a cathode material for supercapacitors.

3

Niezawodna energia odnawialna – zastosowanie kondensatorów elektrochemicznych do gromadzenia energii elektrycznej

Dettlaff A., Wilamowska-Zawłocka M., Klugmann-Radziemska E.

Chemik

|

2016

|

Vol. 70, nr 5

247--254

PL

W artykule przedstawiono urządzenia służące do magazynowania energii, jakim są kondensatory elektrochemiczne, i przybliżono zasadę ich działania. Omówiono również najważniejsze materiały elektrodowe wykorzystywane w technologii wytwarzania superkondensatorów. W części doświadczalnej opisano badania własne nad nowym nanokompozytem składającym się z wielościennych nanorurek węglowych oraz polimeru przewodzącego, a także przedstawiono wyniki badań nad możliwością oraz zaletami zastosowania komercyjnych superkondensatorów do akumulowania energii elektrycznej wytworzonej w ogniwach fotowoltaicznych.

EN

This paper presents electrical energy storage devices such as electrochemical capacitors, their principle of operation and electrode materials most commonly used in their manufacturing technology. Moreover, our research on development of new nanocomposite materials based on multi-walled carbon nanotubes and conducting polymer is shown. Additionally, the possibility and advantages of application of supercapacitors for accumulation of electrical energy generated by photovoltaic cells are presented.

4

Application of Polymer Nanowires for Storing Electric Energy in Supercapacitors

Szubzda B., Szmaja A., Janas K.

Przegląd Elektrotechniczny

|

2013

|

R. 89, nr 8

221--224

PL

Przedstawiono opis prac badawczych nad wykorzystaniem technologii otrzymywania nanodrutów polianiliny do wytwarzania elektrod superkondensatorów. Elektrody badano w modelowej celce kondensatora elektrochemicznego określając zdolność do gromadzenia energii elektrycznej wykorzystując zjawisko tzw. pseudopojemności. Określono wpływ parametrów technologicznych otrzymywania nanodrutów na właściwości elektrochemiczne związane z gromadzeniem ładunku elektrycznego.

EN

The paper presents the the research work on preparation of polyaniline nanowires (PANI) in order to produce supercapacitor electrodes. The electrodes were tested in the cell model of supercapacitor specifying the ability to store electrochemical energy in the electrical way of pseudocapacitance phenomenon – the charge storing in the activated electroconducting polymer. The results of the influence of technological parameters on electrochemical properties associated with the storing of electric charge of obtained nanowires are presented.

5

Effect of ultrasonic treatment of activated carbon on capacitive and pseudocapacitive energy storage in electrochemical supercapacitors

Venhryn B. Y., Grygorchak I.I., Stotsko Z. A., Bakhmatyuk B.P., Mudry S.I., Kulyk Yu.O.

Journal of Achievements in Materials and Manufacturing Engineering

|

2013

|

Vol. 60, nr 2

59--65

EN

Purpose: Use of ultrasonic radiation for improving the properties of activated carbon was the aim of this paper. Increase of density of states at Fermi level was the main factor, responsible for working characteristics of electrochemical supercapacitors. Design/methodology/approach: Working parameters of supercapacitors on the base of activated carbon have been studied by means of precisional porometry, small angle X-ray scattering, cyclic voltamerometry, electrochemical impedance spectroscopy and computer simulation methods. Findings: The possibility to effect the interface between activated carbon and electrolyte by means of ultrasonic treatment in cavitation and noncavitation regimes is proved. It is shown that ultrasonic treatment in noncavitation regimes causes the significant increase of density of states at Fermi level that results in better farad-volt dependences. Research limitations/implications: This research is a complete and accomplished work. Practical implications: Modification of electric double layer by meanans in ultrasonic treatment, proposed in this work, could be regarded as effective way to obtaine the advanced electrode materials in devices of energy generation and storage. Originality/value: This work is important for physics, material science and chemistry because it is related with new possibilities to change the mobility of charge carries in electric double layer by means of ultrasonic irradiation.

6

Zastosowanie nanodrutów polimerowych do gromadzenia energii elektrycznej w superkondensatorach

Szubzda B., Szmaja A., Kuliński R.

Prace Instytutu Elektrotechniki

|

2012

|

Z. 259

37--38

PL

W artykule przedstawiono przebieg i wyniki prac badawczych nad wykorzystaniem technologii chemicznego otrzymywania nanodrutów polianiliny (PANI) do wytwarzania elektrod superkondensatorów. Elektrody badano w modelowym superkondensatorze określając zdolność do elektrochemicznego gromadzenia energii elektrycznej wykorzystując zjawisko tzw. pseudopojemności – gromadzenia ładunku w aktywowanym polimerze elektroprzewodzącym. Zbadano właściwości elektrochemiczne celki kondensatora metodami woltametrii cyklicznej, galwanostatycznym ładowaniem i rozładowaniem oraz spektroskopii impedancyjnej. Przedstawiono wyniki badań wpływu parametrów technologicznych otrzymywania nanodrutów na właściwości elektrochemiczne związane z gromadzeniem ładunku elektrycznego. Określono wpływ starzenia polimeru na zdolność do gromadzenia ładunków elektrycznych. Określono możliwość poprawy właściwości mechanicznych i przewodnictwa elektrycznego nanodrutów PANI przez zastosowanie nanorurek węglowych do wytworzenia nanokompozytu PANI/MWCNT.

EN

The paper presents the progress and results of research work on the preparation of polyaniline nanowires (PANI) by chemical technology, to produce supercapacitors electrode. The electrodes were tested in the model of supercapacitor specifying ability to electrochemical energy storage on the electrical phenomenon way of pseudocapacitance - the charge storing in the activated electroconducting polymer. Properties of electrochemical capacitor cell by cyclic voltammetry methods, galvanostatic charge and discharge and impedance spectroscopy were measured. The results of the influence of technological parameters on electrochemical properties associated with the accumulation of electric charge of obtained nanowires are presented. The effect of aging of the polymer on the ability to accumulate electric charges were described. The possibility for improving the mechanical properties and electrical conductivity of PANI nanowires by using carbon nanotubes to produce nanocomposite PANI / MWCNT were investigated in this work.

7

Węgle aktywne jako materiał elektrodowy dla kondensatorów elektrochemicznych

Nowicki P., Wachowska H.

Wiadomości Chemiczne

|

2009

|

[Z] 63, 5-6

461-476

EN

Electrochemical capacitors (also known as supercapacitors, ultracapacitors or electric double-layer capacitors) have been extensively investigated at a number of research centres in the world. The main reason of this interest is the possibility of their use as an alternative or complement to other electric energy storage or generation devices, e.g. batteries or fuel cells as well as their potential applications in many fields including surge-power delivery devices for electric vehicles, backup-power storage for calculators, starting power for fuel cells, etc. [1]. Research concerning electrochemical capacitors is presently divided into two main areas: (a) the redox supercapacitors (also called pseudocapacitors) and (b) the electrochemical double layer capacitors (EDLC) [2]. Development of electrochemical capacitors is connected with a search of optimal electrode materials able to a high, efficient accumulating of electrical energy, high dynamic of charge exchange with a simultaneous long durability [3]. The most widely used materials for electrochemical capacitors are active carbons. This is due to their unique physico-chemical properties such as: high electrical and thermal conductivity, low density, high corrosion resistance, well developed surface area, controlled porosity as well as availability and relatively low cost [2, 4]. This paper presents the review of literature on the influence of the physico-chemical properties of active carbons on their capacitance parameters. Much attention has been paid to the redox supercapacitors.

8

Charge Storage Properties of Hydrous Molybdenum Oxide Thin Films

Więcek B., Kępas-Suwara A.

Polish Journal of Chemistry

|

2007

|

Vol. 81, nr 1

129-135

EN

Non-stoichiometric mixed-valentmolybdenum oxide film was grown on a glassy carbon (GC) substrate by the electrodeposition method. The specific capacitance of this deposit was studied by cyclic voltammetry, chronopotentiometry and impedance spectroscopy. This non-stoichiometric hydrous oxide exhibits capacitive behaviour between –0.5 and –1.0 V (vs. Ag, AgCl|3 M KCl) in 0.1 M K2SO4. The specific capacitance of studied deposit achieves the value of 160 F.g–1.

9

Development of New Supercapacitor Electrodes Based on carbon Nanotubes

Frąckowiak E., Jurewicz K., Beguin F.

Polish Journal of Chemistry

|

2004

|

Vol. 78 / nr 9

1345-1356

EN

Carbon nanotubes (CNTs) are essentially a mesoporous material with very limited microporosity, hence, they supply only moderate capacitance values. After KOH activation their capacitance values increase significantly from 15 F/g to ca. 100 F/g. CNTs are especially adapted as component of supercapacitor electrodes due to their exceptional conducting and mechanical properties. They play a perfect role of backbone for mate- rials with pseudocapacitance properties. In this work a profitable role of nanotubes in nanocomposites with polypyrrole and polyaniline is demonstrated. High capacitance values from 200 to 360 F/g were obtained for such composites with a good cycling behavior, however, strongly affected by the operating voltage range of supercapacitor.

10

Pseudocapacitance of electrode materials

Frąckowiak E., Jurewicz K., Delpeux S., Beguin F.

Karbo

|

2001

|

Nr 11

390-392

EN

Carbon nanotubes were the capacitance material and capacitance enhancement by pseudocapacitance effect was obtained by oxidation with nitric acid and also by electro deposition of conductive polypyrrole. In case of nanotubes modifies with function groups capacitance increased from 80 to 130 F/g. The most favourable pseudocapacitance effects were obtained with the use of nanocomposite of nanotubes/polypyrrole as electrode material (165 F/g). Open network of nanocomposite allows for effective and reversible accumulation of electric charges and for long-lasting cyclic operation (> 2000 cycles).

PL

Materiałem kondensatorowym były nanorurki węglowe, a podniesienie pojemności poprzez efekty pseudopojemnościowe uzyskano za pomocą ich utleniania kwasem azotowym, a także poprzez elektroosadzanie przewodzącego polipirolu. W przypadku nanorunek modyfikowanych grupami funkcyjnymi pojemność wzrosła z 80 do 130 F/g. Najkorzystniejsze efekty pseudopojemnościowe osiągnięto przy zastosowaniu nanokompozytu na-norurki/polipirol jako materiału elektrodowego (165 F/g). Otwarta sieć nanokompozytu pozwala na efektywne i odwracalne kumulowanie ładunków elektrycznych oraz na długotrwałą pracę cykliczną (>2000 cykli).