Journal ArticleDOI
Operating characteristics of aqueous magnetite electrochemical capacitors
S.-Y. Wang,Nae-Lih Wu +1 more
TLDR
In this paper, the authors investigated the performance of the magnetite supercapacitor in aqueous electrolytes of Na2SO3, KOH and Na2O4.Abstract:
Operating characteristics, including capacitance, leakage current, operating potential range, cycling stability and open-circuit self-discharge behaviours, of the magnetite (Fe3O4) supercapacitor, containing 10 wt % carbon black as conductive additive, in aqueous electrolytes of Na2SO3, KOH and Na2SO4 were investigated. Although the capacitance of the oxide was found to depend heavily on electrolyte composition, the self-discharge mechanism in these electrolytes appeared to be the same. Reduction in the dissolved oxygen content (DOC) of the electrolyte reduced the leakage current and profoundly improved the cycling stability. In particular, Na2SO3(aq) gives the highest capacitance, nearly 30 F (g-Fe3O4)−1 or 80 μF cm−2 of actual surface area, with an operation range of 1.1 V based on a leakage current less than 0.1 mA F−1, and the electrode showed no deterioration after 104 cycles under a DOC < 0.1 ppm.read more
Citations
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Journal ArticleDOI
The role of nanomaterials in redox-based supercapacitors for next generation energy storage devices
TL;DR: The application of nanostructured materials with bespoke morphologies and properties to electrochemical supercapacitors is being intensively studied in order to provide enhanced energy density without comprising their inherent high power density and excellent cyclability.
Journal ArticleDOI
Multifunctional 3D nanoarchitectures for energy storage and conversion.
Debra R. Rolison,Jeffrey W. Long,Justin C. Lytle,Anne E. Fischer,Christopher P. Rhodes,Todd M. McEvoy,Megan E. Bourg,Alia M. Lubers +7 more
TL;DR: The design and fabrication of three-dimensional multifunctional architectures from the appropriate nanoscale building blocks, including the strategic use of void space and deliberate disorder as design components, permits a re-examination of devices that produce or store energy as discussed in this critical review.
Journal ArticleDOI
Crystalline MnO2 as Possible Alternatives to Amorphous Compounds in Electrochemical Supercapacitors
Thierry Brousse,Thierry Brousse,Mathieu Toupin,Romain Dugas,Laurence Athouël,Olivier Crosnier,Daniel Bélanger +6 more
TL;DR: The capacitance of the crystallized materials is clearly dependent upon the crystalline structure, especially with the size of the tunnels able to provide limited cations intercalation as discussed by the authors.
Journal ArticleDOI
Nanostructured transition metal oxides for aqueous hybrid electrochemical supercapacitors
TL;DR: In this article, the authors present an overview of the research carried out in our laboratories with low-cost transition metal oxides (manganese dioxide, iron oxide and vanadium oxide) as active electrode materials for aqueous electrochemical supercapacitors.
Nanostructured Transition Metal Oxides for Aqueous Hybrid Electrochemical Supercapacitors
TL;DR: In this paper, the authors present an overview of the research carried out in our laboratories with low-cost transition metal oxides (manganese dioxide, iron oxide and vanadium oxide) as active electrode materials for aqueous electrochemical supercapacitors.
References
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Journal ArticleDOI
Transition from “Supercapacitor” to “Battery” Behavior in Electrochemical Energy Storage
TL;DR: The transition between battery and supercapacitor behavior arising from a range of degrees of oxidation/reduction that arise over an appreciable range of potentials is discussed in this article.
Journal ArticleDOI
Studies of activated carbons used in double-layer capacitors
Deyang Qu,Hang Shi +1 more
TL;DR: In this paper, the relation between the intrinsic pore size distribution of activated carbon materials and their electrochemical performance as electrodes of supercapacitor was discussed in detail, where activated carbons with larger pore sizes were found to be more suitable for high power applications.
Journal ArticleDOI
Supercapacitor Behavior with KCl Electrolyte
Hee Y. Lee,John B. Goodenough +1 more
TL;DR: Amorphous MnO2·nH2O in a mild 2 M KCl aqueous electrolyte proves to be an excellent electrode for a faradaic electrochemical capacitor cycled between −0.2 and +1.0 V versus SCE.
Journal ArticleDOI
Materials for electrochemical capacitors: Theoretical and experimental constraints
TL;DR: In this article, the authors survey the published data of available electrode materials possessing high specific double-layer or pseudocapacitance and examine their reported performance data in relation to their theoretical expectations.