Journal ArticleDOI
Reduced graphene Oxide–MnO2 hollow sphere hybrid nanostructures as high-performance electrochemical capacitors
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TLDR
In this article, the first successful fabrication of reduced graphene oxide (RGO)-MnO2 hollow sphere (HS) hybrid electrode materials through a solution-based ultrasonic co-assembly method was presented.Abstract:
This paper presents the first successful fabrication of reduced graphene oxide (RGO)–MnO2 hollow sphere (HS) hybrid electrode materials through a solution-based ultrasonic co-assembly method. The porous structure of these MnO2 hollow spheres and the excellent dispersion of active materials give the as-fabricated RGO–MnO2 HS hybrid electrodes excellent specific capacitance and energy density, which can reach up to 578 F g−1 and 69.8 W h kg−1, respectively. These values are considerably larger than those of most reported graphene–MnO2 based hybrid electrochemical capacitors. This solution-processed method can also be used for the hybridization of graphene with other metal oxides in the fabrication of high-performance electrochemical capacitors.read more
Citations
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Ultracapacitors: Why, How, and Where is the Technology
TL;DR: In this paper, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency, and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1.2 kW/kg.
Journal ArticleDOI
Nickel–Cobalt Layered Double Hydroxide Nanosheets for High-performance Supercapacitor Electrode Materials
TL;DR: In this article, a facile and novel one-step method of growing nickel-cobalt layered double hydroxide (Ni-Co LDH) hybrid films with ultrathin nanosheets and porous nanostructures on nickel foam is presented using cetyltrimethylammonium bromide as nanostructure growth assisting agent but without any adscititious alkali sources and oxidants.
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.
Journal ArticleDOI
Engineering of MnO2-based nanocomposites for high-performance supercapacitors
TL;DR: The rapid development of MnO 2 -based nanocomposites for high-performance supercapacitors in recent years has been reviewed in terms of the charge storage mechanism, materials science, and smart cell assembly as discussed by the authors.
Journal ArticleDOI
One-Step Fabrication of Ultrathin Porous Nickel Hydroxide-Manganese Dioxide Hybrid Nanosheets for Supercapacitor Electrodes with Excellent Capacitive Performance
TL;DR: In this article, a facile one-step hydrothermal co-deposition method for growth of ultrathin Ni(OH)2-MnO2 hybrid nanosheet arrays on three dimensional (3D) macroporous nickel foam is presented.
References
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Journal ArticleDOI
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
What Are Batteries, Fuel Cells, and Supercapacitors?
Martin Winter,Ralph J. Brodd +1 more
TL;DR: Batteries, fuel cells and supercapacitors belong to the same family of energy conversion devices and are needed to service the wide energy requirements of various devices and systems.
Journal ArticleDOI
Ultracapacitors: why, how, and where is the technology
TL;DR: In this article, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1-2 kW/kg.
Ultracapacitors: Why, How, and Where is the Technology
TL;DR: In this paper, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency, and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1.2 kW/kg.