1 D Hierarchical MnCo2O4 Nanowire@MnO2 Sheet Core–Shell Arrays on Graphite Paper as Superior Electrodes for Asymmetric Supercapacitors

Liu, Shude, Hui, Kwan San and Hui, Kwun Nam (2015) 1 D Hierarchical MnCo2O4 Nanowire@MnO2 Sheet Core–Shell Arrays on Graphite Paper as Superior Electrodes for Asymmetric Supercapacitors. ChemNanoMat, 1 (8). pp. 593-602. ISSN 2199-692X

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Abstract

Heterostructured metal oxide core–shell architectures have attracted considerable attention owing to their superior electrochemical performance in supercapacitors compared to a single structure. Here, we report a simple and effective synthesis of hierarchical MnCo2O4 nanowire@MnO2 sheet core–shell nanostructures anchored on graphite paper for use in supercapacitors. The proposed electrode exhibits a specific capacitance of 2262 F g−1 at 1 A g−1. In addition, good rate capability and excellent cycling performance are observed. An asymmetric supercapacitor with operating potential at 1.6 V is demonstrated using MnCo2O4@MnO2 as cathode and graphene/nickel foam (NF) as anode. The MnCo2O4@MnO2//graphene/NF asymmetric device shows a high energy density of 85.7 Wh kg−1 at a power density of 800 W kg−1 while maintaining a high energy density of 34.7 Wh kg−1 at 24 kW kg−1. Moreover, the device demonstrates a long-term cycling stability of 81.6 % retention of its initial specific capacitance.

Item Type: Article
Uncontrolled Keywords: asymmetric supercapacitor,core–shell,heterostructures,mnco2o4 nanowire,mno2 sheet
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Depositing User: Pure Connector
Date Deposited: 06 Feb 2018 11:30
Last Modified: 19 Mar 2020 02:34
URI: https://ueaeprints.uea.ac.uk/id/eprint/66231
DOI: 10.1002/cnma.201500105

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