20August2019

Nano-Micro Letters

Hollow Carbon Microspheres/MnO2 Nanosheets Composites: Hydrothermal Synthesis and Electrochemical Behaviors

Hui-li Fan2, Fen Ran1,*, Xuan-xuan Zhang2, Hai-ming Song2, Xiao-qin Niu2, Ling-bin Kong1, Long Kang1

Abstract
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Nano-Micro Letters, , Volume 7, Issue 1, pp 59-67

First Online: November 14, 2014 (Article)

DOI:10.1007/s40820-014-0019-z

 

Abstract

 


a XRD spectrum, and b TGA and DSC curves of micro-HC/nano-MnO2 composite.

This article reported the electrochemical behaviors of a novel hollow carbon microspheres/Manganese dioxide nanosheets (micro-HC/nano-MnO2) composite prepared by an in-situ self-limiting deposition method under hydrothermal condition. The results of scanning electron microscopy (SEM) reveal that MnO2 nanosheets homogeneously grow onto the surface of micro-HC to form a loose-packed microstructure. The quantity of MnO2 required in the electrode layer has thereby been reduced significantly, and higher specific capacitances have been achieved. The micro-HC/nano-MnO2 electrode presents a high capacitance of239.0 Fg-1 at a current density of 5 mA cm−2, which has strong promise for high-rate electrochemical capacitive energy storage applications.

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