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      Hierarchical Flowerlike 3D nanostructure of Co 3O 4@MnO 2/N-doped Graphene oxide (NGO) hybrid composite for a high-performance supercapacitor

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          Abstract

          The present study investigates the fabrication of hierarchical 3D nanostructures with multi-component metal oxides in the presence of highly-porous graphene and characterized for its applications in high-performance supercapacitors. A hierarchical flowers like 3D nanostructure of Co 3O 4 @MnO 2 on nitrogen-doped graphene oxide (NGO) hybrid composite was synthesized by thermal reduction process at 650 °C in the presence of ammonia and urea. The synthesized Co 3O 4@MnO 2/NGO hybrid composites were studied via Raman, XRD, X-ray XPS, FE-SEM, FE-SEM with EDX, FE-TEM and BET analyses. The electrochemical analysis of Co 3O 4@MnO 2/NGO hybrid composite electrode was investigated using cyclic voltammetry, chronopotentiometry and electrochemical impedance measurements. The hybrid composite electrode showed significant specific capacitance results of up to 347 F/g at 0.5 A/g and a corresponding energy density of 34.83 Wh kg −1 with better rate performance and excellent long-term cycling stability were achieved for 10,000 cycles. The obtained electrochemical results paved a way to utilize Co 3O 4@MnO 2/NGO composite electrode as a promising electrode material in high performance supercapacitors.

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          Materials science. Electrochemical capacitors for energy management.

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            Co3O4 Nanowire@MnO2 ultrathin nanosheet core/shell arrays: a new class of high-performance pseudocapacitive materials.

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              Holey graphene frameworks for highly efficient capacitive energy storage.

              Supercapacitors represent an important strategy for electrochemical energy storage, but are usually limited by relatively low energy density. Here we report a three-dimensional holey graphene framework with a hierarchical porous structure as a high-performance binder-free supercapacitor electrode. With large ion-accessible surface area, efficient electron and ion transport pathways as well as a high packing density, the holey graphene framework electrode can deliver a gravimetric capacitance of 298 F g(-1) and a volumetric capacitance of 212 F cm(-3) in organic electrolyte. Furthermore, we show that a fully packaged device stack can deliver gravimetric and volumetric energy densities of 35 Wh kg(-1) and 49 Wh l(-1), respectively, approaching those of lead acid batteries. The achievement of such high energy density bridges the gap between traditional supercapacitors and batteries, and can open up exciting opportunities for mobile power supply in diverse applications.
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                Author and article information

                Contributors
                heungsoo@dgu.edu
                joohyung.kim@inha.ac.kr
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                8 November 2018
                8 November 2018
                2018
                : 8
                : 16543
                Affiliations
                [1 ]ISNI 0000 0001 0671 5021, GRID grid.255168.d, Department of Mechanical, Robotics and Energy Engineering, , Dongguk University–Seoul, Pildong-ro 1 gil, Jung-gu, ; Seoul, 04620 South Korea
                [2 ]ISNI 0000 0001 0671 5021, GRID grid.255168.d, Division of Electronics and Electrical Engineering, , Dongguk University–Seoul, Pildong-ro 1 gil, Jung-gu, ; Seoul, 04620 South Korea
                [3 ]ISNI 0000 0001 2364 8385, GRID grid.202119.9, Department of Mechanical Engineering, , Inha University, Inha-ro 100, Nam-gu, ; Incheon, 22212 South Korea
                Author information
                http://orcid.org/0000-0002-1518-9972
                Article
                34905
                10.1038/s41598-018-34905-7
                6224585
                30410051
                ea24a0db-6529-411d-ad0d-83e1c36a5048
                © The Author(s) 2018

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 7 March 2018
                : 18 October 2018
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100003725, National Research Foundation of Korea (NRF);
                Award ID: NRF-2017R1D1A1B03028368
                Award ID: 2017K1A4A3013662
                Award Recipient :
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