Journal ArticleDOI
Synthesis and electrochemical characterization of amorphous MnO2 electrochemical capacitor electrode material
TLDR
Amorphous MnO2 was synthesized using the sol-gel method by reduction of NaMnO4 with solid fumaric acid as mentioned in this paper, and the synthesized product was characterized using X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and chemical analysis.About:
This article is published in Journal of Power Sources.The article was published on 2004-05-20. It has received 328 citations till now. The article focuses on the topics: Cyclic voltammetry & Amorphous solid.read more
Citations
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Materials for electrochemical capacitors
TL;DR: This work has shown that combination of pseudo-capacitive nanomaterials, including oxides, nitrides and polymers, with the latest generation of nanostructured lithium electrodes has brought the energy density of electrochemical capacitors closer to that of batteries.
Journal ArticleDOI
A review of electrode materials for electrochemical supercapacitors
TL;DR: Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density.
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Review on supercapacitors: Technologies and materials
TL;DR: In this article, the technologies and working principles of different materials used in supercapacitors are explained, together with brief explanations of their properties, such as specific surface area and capacitance values.
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Hydrothermal synthesis and pseudocapacitance properties of MnO2 nanostructures.
TL;DR: Interestingly, SEM, TEM, and HRTEM revealed a variety of structures ranging from nanostructured surface with a distinct platelike morphology to nanorod depending upon the hydrothermal reaction time employed during the preparation of the manganese oxide: increasing the amount of individual nanorods in the materials prepared with longer hydrother mal reaction time.
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.
References
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Journal ArticleDOI
Novel Electrode Materials for Thin‐Film Ultracapacitors: Comparison of Electrochemical Properties of Sol‐Gel‐Derived and Electrodeposited Manganese Dioxide
TL;DR: In this paper, the performance of thin films of manganese dioxide on nickel foils was studied by cyclic voltammetry in the range 0.0-0.9 V (SCE) and by chronopotentiometry in unbuffered solution.
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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.
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Influence of Microstucture on the Charge Storage Properties of Chemically Synthesized Manganese Dioxide
TL;DR: In this paper, the α-MnO2 powder was synthesized by a simple coprecipitation technique and tested as active electrode material for an electrochemical supercapacitor, showing that an average capacitance of 166 F/g can be reproducibly obtained within a voltage range −0.4/+0.5 V vs Hg/Hg2SO4 using a sweep rate of 2 mV/s.
Journal ArticleDOI
Sol–gel MnO2 as an electrode material for electrochemical capacitors
TL;DR: In this article, two forms of MnO2, namely xerogel and ambigel, were prepared by reduction of NaMnO4 and KCl with sodium fumarate and the synthesized products were characterized using X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and chemical analysis.
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Nanocrystalline Manganese Oxides for Electrochemical Capacitors with Neutral Electrolytes
Yeon Uk Jeong,Arumugam Manthiram +1 more
TL;DR: In this article, nanocrystalline manganese oxides have been synthesized by reducing aqueous KMnO 4 solution with various reducing agents such as potassium borohydride, sodium dithionite, sodium hypophosphite, and hydrochloric acid under various controlled pH conditions.