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      Large-scale synthesis of hybrid metal oxides through metal redox mechanism for high-performance pseudocapacitors

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          Abstract

          Electrochemical performance and production cost are the main concerns for the practical application of supercapacitors. Here we report a simple and universally applicable method to prepare hybrid metal oxides by metal redox reaction utilizing the inherent reducibility of metals and oxidbility of for the first time. As an example, Ni(OH) 2/MnO 2 hybrid nanosheets (NMNSs) are grown for supercapacitor application by self-reaction of Ni foam substrates in KMnO 4 solution at room temperature. The obtained hybrid nanosheets exhibit high specific capacitance (2,937 F g −1). The assembled solid-state asymmetric pseudocapacitors possess ultrahigh energy density of 91.13 Wh kg −1 (at the power density of 750 W kg −1) and extraordinary cycling stability with 92.28% capacitance retention after 25,000 cycles. Co(OH) 2/MnO 2 and Fe 2O 3/MnO 2 hybrid oxides are also synthesized through this metal redox mechanism. This green and low-cost method is capable of large-scale production and one-step preparation of the electrodes, holding promise for practical application of high-performance pseudocapacitors.

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          Most cited references23

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          Materials science. Electrochemical capacitors for energy management.

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            Two-dimensional transition metal dichalcogenide nanosheet-based composites.

            Ultrathin two-dimensional (2D) nanosheets of layered transition metal dichalcogenides (TMDs), such as MoS2, TiS2, TaS2, WS2, MoSe2, WSe2, etc., are emerging as a class of key materials in chemistry and electronics due to their intriguing chemical and electronic properties. The ability to prepare these TMD nanosheets in high yield and large scale via various methods has led to increasing studies on their hybridization with other materials to create novel functional composites, aiming to engineer their chemical, physical and electronic properties and thus achieve good performance for some specific applications. In this critical review, we will introduce the recent progress in hybrid nanoarchitectures based on 2D TMD nanosheets. Their synthetic strategies, properties and applications are systematically summarized and discussed, with emphasis on those new appealing structures, properties and functions. In addition, we will also give some perspectives on the challenges and opportunities in this promising research area.
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              Co3O4 Nanowire@MnO2 ultrathin nanosheet core/shell arrays: a new class of high-performance pseudocapacitive materials.

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                Author and article information

                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group
                2045-2322
                25 January 2016
                2016
                : 6
                : 20021
                Affiliations
                [1 ]Shenzhen Engineering Lab for Supercapacitor Materials, Shenzhen Key Laboratory for Advanced Materials, and Department of Material Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, University Town , Shenzhen 518055, China
                Author notes
                Article
                srep20021
                10.1038/srep20021
                4726185
                26805027
                0c06769a-e611-45c5-8986-156a201e84e8
                Copyright © 2016, Macmillan Publishers Limited

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                : 01 September 2015
                : 21 December 2015
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