Enhancing the supercapacitor performance of flexible MnOxCarbon cloth electrodes by Pd-decoration

被引:29
作者
Babkova, T. A. [1 ]
Fei, H. [1 ]
Kazantseva, N. E. [1 ]
Sapurina, I. Y. [1 ]
Saha, P. [1 ]
机构
[1] Tomas Bata Univ Zlin, Ctr Polymer Syst, Tr T Bati 5678, Zlin 76001, Czech Republic
关键词
Manganese oxide; Palladium; Carbon cloth; Electrodeposition; Nucleation and growth; Supercapacitor; MANGANESE-DIOXIDE; MNO2; OXIDE; NANOSTRUCTURES; NICKEL; GROWTH;
D O I
10.1016/j.electacta.2018.03.143
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Manganese oxide (MnOx)-based hybrid electrode materials have been designed by electrochemical deposition on carbon cloth preliminary activated by palladium (Pd) nanoparticles. The synthesis conditions (current density, deposition time) were chosen in such a way as to achieve a stable structure of MnOx with a large surface area. The structural parameters and surface morphology of materials obtained are characterized by Scanning Electron and Transmission Electron Microscopy (SEM, TEM), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), etc. The electrochemical behavior was investigated by cyclic voltammetry, galvanostatic charge/discharge and impedance spectroscopy. The attained results indicate that MnOx deposits reviled birnessite-type structural feature. Apart from that, the morphology of MnOx transformed with increasing of current density from needlelike structure to loosely-packed thin sheets and then to closed-packed thicker sheets structures. Different morphology exhibits different specific surface area and electrochemical efficiency. Hence electrochemical analysis reviled the highest specific capacitance (186 F g(-1)) and cyclic stability for MnOxPdCC with obtained at current density of 1 mA cm(-2). It can be explained by the formation of a less dense structure of MnOx (loosely-packed thin sheets) with large specific surface area and thus better permeability for Na+ and SO4-2 ions. As to the role of Pd, its nanoparticles deposited on CC can play a dual role, namely electron conducting passway between CC and MnOx and structure-guiding agent of manganese oxides nucleation and grows. (C) 2018 Elsevier Ltd. All rights reserved.
引用
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页码:1 / 10
页数:10
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