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      Functional Porous Carbon/Nickel Oxide Nanocomposites as Binder-Free Electrodes for Supercapacitors

      , , , ,
      Chemistry - A European Journal
      Wiley-Blackwell

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          Abstract

          High-surface-area, guava-leaf-derived, heteroatom-containing activated carbon (GHAC) materials were synthesized by means of a facile chemical activation method with KOH as activating agent and exploited as catalyst supports to disperse nickel oxide (NiO) nanocrystals (average size (2.0±0.1) nm) through a hydrothermal process. The textural and structural properties of these GHAC/NiO nanocomposites were characterized by various physicochemical techniques, namely, field-emission SEM, high-resolution TEM, elemental analysis, X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis, and Raman spectroscopy. The as-synthesized GHAC/NiO nanocomposites were employed as binder-free electrodes, which exhibited high specific capacitance (up to 461 F g(-1) at a current density of 2.3 A g(-1)) and remarkable cycling stability, which may be attributed to the unique properties of GHAC and excellent electrochemical activity of the highly dispersed NiO nanocrystals.

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          Interpretation of Raman spectra of disordered and amorphous carbon

          Physical Review B, 61(20), 14095-14107
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            Nanostructured carbon-metal oxide composite electrodes for supercapacitors: a review.

            This paper presents a review of the research progress in the carbon-metal oxide composites for supercapacitor electrodes. In the past decade, various carbon-metal oxide composite electrodes have been developed by integrating metal oxides into different carbon nanostructures including zero-dimensional carbon nanoparticles, one-dimensional nanostructures (carbon nanotubes and carbon nanofibers), two-dimensional nanosheets (graphene and reduced graphene oxides) as well as three-dimensional porous carbon nano-architectures. This paper has described the constituent, the structure and the properties of the carbon-metal oxide composites. An emphasis is placed on the synergistic effects of the composite on the performance of supercapacitors in terms of specific capacitance, energy density, power density, rate capability and cyclic stability. This paper has also discussed the physico-chemical processes such as charge transport, ion diffusion and redox reactions involved in supercapacitors.
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              Graphene-based materials as supercapacitor electrodes

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                Author and article information

                Journal
                Chemistry - A European Journal
                Chem. Eur. J.
                Wiley-Blackwell
                09476539
                May 26 2015
                May 26 2015
                : 21
                : 22
                : 8200-8206
                Article
                10.1002/chem.201500247
                25882793
                d0d7e76d-f400-4866-a307-c61bce9eff6a
                © 2015

                http://doi.wiley.com/10.1002/tdm_license_1.1

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