Tailoring the supercapacitive performances of noble metal oxides, porous carbons and their composites

Porous electrochemical supercapacitive materials, as an important type of new-generation energy storage devices, require a detailed analysis and knowledge of their capacitive performances upon different charging/discharging regimes. The investigation of the responses to dynamic perturbations of typi...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society 2013, Vol.78 (12), p.2141-2164
Main Authors: Panic, Vladimir, Dekanski, Aleksandar, Nikolic, Branislav
Format: Article
Language:English
Subjects:
carbon blacks
Carbonaceous materials
Charging
Depth profiling
Electrical charging
Electrochemical impedance spectroscopy
Energy storage
IrO2
Ladders
Metal oxides
Porous materials
pseudocapacitance
RuO2
Ruthenium oxide
Thin films
transmission line model
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Summary:Porous electrochemical supercapacitive materials, as an important type of new-generation energy storage devices, require a detailed analysis and knowledge of their capacitive performances upon different charging/discharging regimes. The investigation of the responses to dynamic perturbations of typical representatives, noble metal oxides, carbonaceous materials and RuO2-impregnated carbon blacks, by electrochemical impedance spectroscopy (EIS) is presented. This presentation follows a brief description of supercapacitive behavior and origin of pseudocapacitive response of noble metal oxides. For all investigated materials, the electrical charging/discharging equivalent of the EIS response was found to obey the transmission line model envisaged as so-called ?resistor/capacitor (RC) ladder?. The ladder features are correlated to material physicochemical properties, its composition and the composition of the electrolyte. Fitting of the EIS data of different supercapacitive materials to appropriate RC ladders enables the in-depth profiling of the capacitance and pore resistance of their porous thin-layers and finally the complete revelation of capacitive energy storage issues.
ISSN:0352-5139
1820-7421
DOI:10.2298/JSC131031128P