Three-Dimensional Self-Standing and Conductive MnCO3@Graphene/CNT Networks for Flexible Asymmetric Supercapacitors

Wu, Shuxing, Liu, Canbin, Dinh, Duc Anh, Hui, Kwan San, Hui, Kwun Nam, Yun, Je Moon and Kim, Kwang Ho (2019) Three-Dimensional Self-Standing and Conductive MnCO3@Graphene/CNT Networks for Flexible Asymmetric Supercapacitors. ACS Sustainable Chemistry and Engineering, 7 (11). pp. 9763-9770. ISSN 2168-0485

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Abstract

The practical applications of flexible supercapacitor depend strongly on the successful fabrication of advanced electrode materials with high electrochemical performance. Herein, three-dimensional conductive network-based self-standing MnCO3@graphene/CNT hybrid film fabricated through a combination of a hydrothermal method and vacuum filtration for flexible solid-state supercapacitors is reported. The MnCO3@graphene structure is embedded in a CNT network, in which monodispersed MnCO3 nanorod is well confined in graphene nanosheets. This hierarchical structure provides rapid electron/electrolyte ion transport pathways and exhibits excellent structural stability, resulting in rapid kinetics and a long life cycle. The MnCO3@graphene/CNT electrode delivers high specific capacity (467.2 F g–1 at 1 A g–1). Asymmetric supercapacitor (ASC) devices are assembled with the MnCO3@graphene/CNT film as positive electrode and activated carbon/carbon cloth as negative electrode, which exhibits a high energy density of 27 W h kg–1. Remarkably, 93% capacitance retention is obtained for the ASC devices after 6000 cycles.

Item Type: Article
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Depositing User: LivePure Connector
Date Deposited: 10 Jul 2019 13:31
Last Modified: 29 Jun 2020 23:59
URI: https://ueaeprints.uea.ac.uk/id/eprint/71708
DOI: 10.1021/acssuschemeng.8b05935

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