Reply to comments on “Intrinsic limitations of impedance measurements in determining electric double layer capacitances” by H. Wang, L. Pilon [Electrochimica Acta 63 (2012) 55]

2012 ◽  
Vol 76 ◽  
pp. 529-531 ◽  
Author(s):  
Hainan Wang ◽  
Laurent Pilon
Keyword(s):  
Double Layer ◽  
Electric Double Layer ◽  
Impedance Measurements

scholarly journals Preparation and Characterization of Electrospun Gelatin Nanofibers for Use as Nonaqueous Electrolyte in Electric Double-Layer Capacitor

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Ditpon Kotatha ◽  
Masaharu Hirata ◽  
Mayuko Ogino ◽  
Satoshi Uchida ◽  
Masashi Ishikawa ◽  
...  
Keyword(s):  
Double Layer ◽  
Electric Double Layer ◽  
Ac Impedance ◽  
Gel Electrolyte ◽  
Stable Form ◽  
Impedance Measurements ◽  
Discharge Capacitance ◽  
Nonaqueous Electrolyte ◽  
Nanofibrous Structure ◽  
Test Cells

A novel nanofibrous gel electrolyte was prepared via gelatin electrospinning for use as a nonaqueous electrolyte in electric double-layer capacitors (EDLCs). An electrospinning technique with a 25 wt% gelatin solution was applied to produce gelatin electrospun (GES) nanofiber electrolytes. Structural analysis of the GES products showed a clearly nanofibrous structure with fiber diameters in the 306.2–428.4 nm range and exhibiting high thermal stability, high tensile strength, and a stable form of nanofibrous structure after immersion in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4). After testing over a range of spinning times, GES electrolytes that were produced at 25 min (GES-25) had a suitable thickness for the assembly of EDLC with the optimized tensile properties and were used to fabricate EDLC test cells with EMImBF4. These test cells were compared to those with pure EMImBF4 and a separator as an electrolyte. The electrochemical properties of the test cells were characterized by charge-discharge testing, discharge capacitance, and alternative current (AC) impedance measurements. AC impedance measurements showed that the test cell with the GES-25/EMImBF4 gel electrolyte showed slightly poorer contact with the electrode when compared to that with pure EMImBF4, whereas exhibited comparable IR drop and discharge capacitance (calculated capacitance retention was 56.6%). The results demonstrated that this novel gel electrolyte can be used as a nonaqueous electrolyte in order to improve the safety in EDLCs.

Electrode for Electric Double Layer Capacitor Made of Carbonized and Activated Cotton Cloth

2014 ◽  
Vol 134 (5) ◽  
pp. 360-361
Author(s):  
Masumi Fukuma ◽  
Takayuki Uchida ◽  
Yukito Fukushima ◽  
Jinichi Ogawa ◽  
Katsumi Yoshino
Keyword(s):  
Double Layer ◽  
Electric Double Layer ◽  
Cotton Cloth ◽  
Electric Double Layer Capacitor ◽  
Double Layer Capacitor
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