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Cage-like MnO2-Mn2O3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

Jia, S; Ma, Y; Wang, H; Key, J; Brett, DJL; Wang, R; (2016) Cage-like MnO2-Mn2O3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material. Electrochimica Acta , 219 pp. 540-546. 10.1016/j.electacta.2016.10.058. Green open access

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Abstract

This study presents the preparation of novel cage-like MnO2-Mn2O3 particles that have high surface area and macro-porosity. Carbonaceous (C) spheres were first prepared hydrothermally as templates for a subsequent hydrothermal step of MnO2 shell precipitation. Adjusting the Mn precursor concentration and hydrothermal dwell time resulted in MnO2 shells of different thickness. Following calcination to remove carbon, thinner shells resulted in cage-like structure and a higher degree of Mn2O3 content, while thicker shells produced complete hollow spheres. The cage-like MnO2-Mn2O3 hollow spheres (CMHS) produced a 30% larger specific capacity than that of complete hollow spheres at 0.05 A g−1. On a 100 fold current density increase to 5 A g−1 CMHS had a 49.9% of its initial specific capacitance, and had 77.4% capacitance retention after 2000 cycles at 2 A g−1. Cage-like particles, through their high surface area and macro-porosity, thus afford a promising target structure for supercapacitor materials, and can be prepared as described herein.

Type: Article
Title: Cage-like MnO2-Mn2O3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.electacta.2016.10.058
Publisher version: http://dx.doi.org/10.1016/j.electacta.2016.10.058
Language: English
Additional information: © 2017. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licences are available at http://creativecommons.org/licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: Science & Technology, Physical Sciences, Electrochemistry, Cage-Like Hollow Sphere, MnO2-Mn2O3, Cathode, Supercapacitor, Lithium-Ion Batteries, High-Performance Supercapacitors, Electrochemical Properties, Manganese-Dioxide, Electrode Materials, Storage Properties, Facile Synthesis, Anode Material, Mn2O3 Hollow, MnO2
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1545060
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