electrochemical capacitor
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2022 ◽  
Vol 284 ◽  
pp. 116991
Author(s):  
Asfand Yar ◽  
Syam G. Krishnan ◽  
John Ojur Dennis ◽  
Amina Yasin ◽  
Mohammad Khalid ◽  
...  

Author(s):  
Paresh S. Gaikar ◽  
Ankita P. Angre ◽  
Gurumeet Wadhawa ◽  
Pankaj V. Ledade ◽  
Sami H. Mahmood ◽  
...  

2021 ◽  
Author(s):  
Magdalena Skunik-Nuckowska ◽  
Justyna Lubera ◽  
Patryk Rączka ◽  
Aleksandra A. Mroziewicz ◽  
Sławomir Dyjak ◽  
...  

2021 ◽  
Vol 22 (4) ◽  
pp. 644-654
Author(s):  
H.M. Kolkovska ◽  
B.I. Rachiy ◽  
P.I. Kolkovskyi ◽  
I.P. Yaremiy ◽  
N.Ya. Ivanichok ◽  
...  

In this work, the electrochemical behavior of LaMnO3 perovskite material and nanoporous carbon material in an aqueous solution of lithium sulfate are studied. The regularities of the expediency of the joint functioning of these materials as electrodes for a hybrid electrochemical capacitor are determined. It was found that the value of the specific capacity of the investigated electrochemical system of LaMnO3 / electrolyte / AC is 52 F/g during the discharge of the system to 1 V and the value of specific energy is 112.1 J /g at a discharge current of 1 mA.


Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3495
Author(s):  
Piotr Gajewski ◽  
Aneta Lewandowska ◽  
Katarzyna Szcześniak ◽  
Grzegorz Przesławski ◽  
Agnieszka Marcinkowska

In this work, hydrogel polymer electrolytes (HPEs) were obtained by the photopolymerization of a mixture of two monomers: Exothane 8 (Ex8) and 2-hydroxyethylmethacrylate acid phosphate (HEMA-P) in an organic solvent N-methyl-2-pyrrolidone (NMP), which was replaced after polymerization with water, and then with the electrolyte. The ratio of monomers as well as the concentration of NMP was changed in the composition to study its influence on the properties of the HPE: conductivity (electrochemical impedance spectroscopy, EIS) and mechanical properties (puncture resistance). Properties were optimized using a mathematical model to obtain a hydrogel with both good mechanical and conductive properties. To the best of our knowledge, it is the first publication that demonstrates the application of optimization methods for the preparation of HPE. Then, the hydrogel with optimal properties was tested as a separator in a two-electrode symmetric AC/AC pouch-cell. The cells were investigated by cyclic voltammetry galvanostatic charge/discharge with potential limitation and EIS. Good mechanical properties of HPE allowed for obtaining samples of smaller thickness while maintaining very good dimensional stability. Thus, the electrochemical capacitor (EC) resistance was reduced and their electrochemical properties improved. Moreover, photopolymerization kinetics in the solvent and in bulk by photo-DSC (differential scanning calorimetry) were performed. The great impact on the polymerization of HEMA-P and its mixtures (with Ex8 and NMP) have strong intermolecular interactions between reagents molecules (i.e., hydrogen bonds).


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