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      Asymmetric Pseudocapacitors Based on Interfacial Engineering of Vanadium Nitride Hybrids

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          Abstract

          Vanadium nitride (VN) shows promising electrochemical properties as an energy storage devices electrode, specifically in supercapacitors. However, the pseudocapacitive charge storage in aqueous electrolytes shows mediocre performance. Herein, we judiciously demonstrate an impressive pseudocapacitor performance by hybridizing VN nanowires with pseudocapacitive 2D-layered MoS 2 nanosheets. Arising from the interfacial engineering and pseudocapacitive synergistic effect between the VN and MoS 2, the areal capacitance of VN/MoS 2 hybrid reaches 3187.30 mF cm −2, which is sevenfold higher than the pristine VN (447.28 mF cm −2) at a current density of 2.0 mA cm −2. In addition, an asymmetric pseudocapacitor assembled based on VN/MoS 2 anode and TiN coated with MnO 2 (TiN/MnO 2) cathode achieves a remarkable volumetric capacitance of 4.52 F cm −3 and energy density of 2.24 mWh cm −3 at a current density of 6.0 mA cm −2. This work opens a new opportunity for the development of high-performance electrodes in unfavorable electrolytes towards designing high areal-capacitance electrode materials for supercapacitors and beyond.

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

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            Array of nanosheets render ultrafast and high-capacity Na-ion storage by tunable pseudocapacitance

            Sodium-ion batteries are a potentially low-cost and safe alternative to the prevailing lithium-ion battery technology. However, it is a great challenge to achieve fast charging and high power density for most sodium-ion electrodes because of the sluggish sodiation kinetics. Here we demonstrate a high-capacity and high-rate sodium-ion anode based on ultrathin layered tin(II) sulfide nanostructures, in which a maximized extrinsic pseudocapacitance contribution is identified and verified by kinetics analysis. The graphene foam supported tin(II) sulfide nanoarray anode delivers a high reversible capacity of ∼1,100 mAh g−1 at 30 mA g−1 and ∼420 mAh g−1 at 30 A g−1, which even outperforms its lithium-ion storage performance. The surface-dominated redox reaction rendered by our tailored ultrathin tin(II) sulfide nanostructures may also work in other layered materials for high-performance sodium-ion storage.
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              All Pseudocapacitive MXene-RuO2 Asymmetric Supercapacitors

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                Author and article information

                Journal
                Nanomaterials (Basel)
                Nanomaterials (Basel)
                nanomaterials
                Nanomaterials
                MDPI
                2079-4991
                10 June 2020
                June 2020
                : 10
                : 6
                : 1141
                Affiliations
                [1 ]College of Materials Science and Engineering, Hunan University, Changsha 410082, China; suehai@ 123456hnu.edu.cn (H.S.); xiongtz@ 123456hnu.edu.cn (T.X.); tqr@ 123456hnu.edu.cn (Q.T.); yfang@ 123456hnu.edu.cn (F.Y.); Paul.blessington123@ 123456gmail.com (P.B.S.A.)
                [2 ]College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China; afuwape07@ 123456hnu.edu.cn
                [3 ]Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China; huangych@ 123456gzhu.edu.cn
                Author notes
                [* ]Correspondence: balogun@ 123456hnu.edu.cn (M.-S.B.); kunkunguo@ 123456hnu.edu.cn (K.G.)
                Author information
                https://orcid.org/0000-0003-1529-5318
                Article
                nanomaterials-10-01141
                10.3390/nano10061141
                7353334
                32531987
                5e51c043-38fa-4361-9b0f-bb902458b474
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 18 April 2020
                : 06 June 2020
                Categories
                Article

                vn nanowires,mos2 nanosheets,phase boundary,pseudocapacitive charge storage,asymmetric pseudocapacitor

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