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      Supercapacitor electrode with a homogeneously Co 3O 4-coated multiwalled carbon nanotube for a high capacitance

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          Abstract

          Cobalt oxide (Co 3O 4) was homogeneously coated on multiwalled carbon nanotube through a simple chemical deposition method and employed in supercapacitor electrodes. SEM image indicated the uniform distribution of Co 3O 4 nanoparticles on the surface of the multiwalled carbon nanotube. A maximum specific capacitance of 273 Fg −1 was obtained at the charge–discharge current density of 0.5 Ag −1. After 500 cycles of continuous charge–discharge process, about 88% of the initial capacity could be retained.

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          The online version of this article (doi:10.1186/s11671-015-0915-2) contains supplementary material, which is available to authorized users.

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          Most cited references 26

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          Design and tailoring of the nanotubular arrayed architecture of hydrous RuO2 for next generation supercapacitors.

          By use of the membrane-templated synthesis route, hydrous RuO2 (RuO2.xH2O) nanotubular arrayed electrodes were successfully synthesized by means of the anodic deposition technique. The desired three-dimensional mesoporous architecture of RuO2.xH2O nanotubular arrayed electrodes with annealing in air at 200 degrees C for 2 h simultaneously maintained the facility of electrolyte penetration, the ease of proton exchange/diffusion, and the metallic conductivity of crystalline RuO2, exhibiting unexpectedly ultrahigh power characteristics with its frequency "knee" reaching ca. 4.0-7.8 kHz, 20-40 times better than that of RuO2 single crystalline, arrayed nanorods. The specific power and specific energy of annealed RuO2.xH2O nanotubes measured at 0.8 V and 4 kHz is equal to 4320 kW kg-1 and 7.5 W h kg-1, respectively, demonstrating the characteristics of next generation supercapacitors.
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            Chemically modified graphene sheets produced by the solvothermal reduction of colloidal dispersions of graphite oxide

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              Li ion battery materials with core-shell nanostructures.

              Nanomaterials have some disadvantages in application as Li ion battery materials, such as low density, poor electronic conductivity and high risk of surface side reactions. In recent years, materials with core-shell nanostructures, which was initially a common concept in semiconductors, have been introduced to the field of Li ion batteries in order to overcome the disadvantages of nanomaterials, and increase their general performances in Li ion batteries. Many efforts have been made to exploit core-shell Li ion battery materials, including cathode materials, such as lithium transition metal oxides with varied core and shell compositions, and lithium transition metal phosphates with carbon shells; and anode materials, such as metals, alloys, Si and transition metal oxides with carbon shells. More recently, graphene has also been proposed as a shell material. All these core-shell nanostructured materials presented enhanced electrochemical capacity and cyclic stability. In this review, we summarize the preparation, electrochemical performances, and structural stability of core-shell nanostructured materials for lithium ion batteries, and we also discuss the problems and prospects of this kind of materials.
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                Author and article information

                Contributors
                361769238@qq.com
                Lishengjun1011@126.com
                531528278@qq.com
                wangbei@henu.edu.cn
                niedayong@126.com
                chenzeng@126.com
                1374945802@qq.com
                wanning@henu.edu.cn
                wfzhang@henu.edu.cn
                Journal
                Nanoscale Res Lett
                Nanoscale Res Lett
                Nanoscale Research Letters
                Springer US (New York )
                1931-7573
                1556-276X
                6 May 2015
                6 May 2015
                2015
                : 10
                Affiliations
                [ ]Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics and Electronics, Henan University, Kaifeng, 475001 China
                [ ]Department of Basic Courses, Yellow River Conservancy Technical Institute, Kaifeng, 475001 China
                Article
                915
                10.1186/s11671-015-0915-2
                4437991
                25995711
                © Tao et al.; licensee Springer. 2015

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

                Categories
                Nano Express
                Custom metadata
                © The Author(s) 2015

                Nanomaterials

                supercapacitor, cobalt oxide, multiwalled carbon nanotube, charge–discharge

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