scholarly journals The Capacitive Behaviors of Manganese Dioxide Thin-Film Electrochemical Capacitor Prototypes

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Suh Cem Pang ◽  
Boon Hong Wee ◽  
Suk Fun Chin
Keyword(s):  
Thin Film ◽  
Surface Morphology ◽  
Manganese Dioxide ◽  
Aqueous Electrolyte ◽  
Electrochemical Impedance ◽  
Electrochemical Capacitor ◽  
Pulsed Power ◽  
Power Sources ◽  
Thin Film Electrodes ◽  
Load Leveling

We have documented the fabrication of manganese dioxide (MnO2) thin-film electrochemical capacitor (EC) prototypes with dual-planar electrode configuration. These EC prototypes exhibited good capacitive behaviors in mild Na2SO4aqueous electrolyte. Enhanced capacitive behaviors of EC prototypes were observed upon prolonged voltammetric cycling which could be associated with microstructural transformation of MnO2thin-film electrodes from densely packed plate-like to irregular petal-like surface morphology. Effects of voltammetric scan rates, prolonged voltammetric cycling, electrolyte composition, and electrolyte concentration on the surface morphology of MnO2thin-film electrodes, and associated capacitive behaviors of MnO2thin-film EC prototypes were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD) techniques. Results of both CV and EIS indicated that thin-film MnO2EC prototypes exhibited the highest specific capacitance of 327 F/g in 0.2 M Na2SO4aqueous electrolyte. Being environmentally benign and cheap, MnO2thin-film electrochemical capacitors have high potential utility as pulsed power sources, as well as load-leveling functions in various consumer electronic devices.

Highly Concentrated Aqueous Electrolyte With a Large Stable Potential Window for Electrochemical Double-Layer Capacitors

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Guoqing Zhang ◽  
Yongqing Zhao ◽  
Binbin Jin ◽  
Peng Zhang ◽  
Shuying Kong
Keyword(s):  
Aqueous Electrolyte ◽  
Electrochemical Impedance ◽  
Discharge Rate ◽  
Saturated Calomel Electrode ◽  
Electrochemical Capacitor ◽  
Superior Performance ◽  
Operating Voltage ◽  
Galvanostatic Discharge ◽  
Electrochemical Double Layer Capacitors ◽  
Electrochemical Double Layer

Abstract An active carbon (AC)/AC electrochemical capacitor, taking advantage of a high-concentrated lithium trifluoromethane sulfonate (LiTFS) or lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) aqueous electrolyte, was demonstrated with an extended operating voltage of 2.5 V, which is the largest value till now for aqueous carbon-based capacitors. The AC electrode is entirely capacitive in these two electrolytes and the stable potential window of the single AC electrode can reach −1.2 to 1.2 V versus the saturated calomel electrode (SCE). The performance of the AC-based capacitor is evaluated in two- and three-electrode cells using a combination of electrochemical impedance (EIS), cyclic voltammetry (CV), galvanostatic discharge-charge, and self-discharge (SD, i.e., leakage current) measurements. At 0.5-mA cm−2 charge-discharge rate, the AC/AC capacitor presents 5.5 wh kg−1 and 4.5 wh kg−1 energy density for 20 m LiTFS and LiTFSI electrolyte, respectively. The results suggest that a thorough utilization of such lithium salt aqueous electrolytes with widening electrochemical stable potential window will no doubt lead to further development of electrochemical capacitors toward superior performance.

Surface layer formation of LiCoO2 thin film electrodes in non-aqueous electrolyte containing lithium bis(oxalate)borate

2012 ◽  
Vol 210 ◽  
pp. 60-66 ◽  
Author(s):  
Masaki Matsui ◽  
Kaoru Dokko ◽  
Yasuhiro Akita ◽  
Hirokazu Munakata ◽  
Kiyoshi Kanamura
Keyword(s):  
Thin Film ◽  
Surface Layer ◽  
Aqueous Electrolyte ◽  
Layer Formation ◽  
Thin Film Electrodes ◽  
Surface Layer Formation

Voltammetric and Electrogravimetric Study of Manganese Dioxide Thin Film Electrodes: II. Chemically Deposited Films

1999 ◽  
Vol 146 (9) ◽  
pp. 3161-3167 ◽  
Author(s):  
Y. Ratieuville ◽  
W. L. Wu ◽  
D. Lincot ◽  
J. Vedel ◽  
L. T. Yu
Keyword(s):  
Thin Film ◽  
Manganese Dioxide ◽  
Thin Film Electrodes ◽  
Deposited Films

Transparent electrochemical capacitor based on electrodeposited MnO2 thin film electrodes and gel-type electrolyte

2009 ◽  
Vol 11 (6) ◽  
pp. 1259-1261 ◽  
Author(s):  
F. Moser ◽  
L. Athouël ◽  
O. Crosnier ◽  
F. Favier ◽  
D. Bélanger ◽  
...  
Keyword(s):  
Thin Film ◽  
Electrochemical Capacitor ◽  
Thin Film Electrodes ◽  
Type Electrolyte
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