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High Performance MnO2 Nanoflower Supercapacitor Electrode by Electrochemical Recycling of Spent Batteries

Ali, Gomaa A. M. and M. M., Yusoff and Shaaban, Essam R. and Chong, Kwok Feng (2017) High Performance MnO2 Nanoflower Supercapacitor Electrode by Electrochemical Recycling of Spent Batteries. Ceramics International, 43 (11). pp. 8440-8448. ISSN 0272-8842

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Abstract

MnO2 nanoflower is prepared by electrochemical conversion of Mn3O4 obtained by heat treatment of spent zinc‒carbon batteries cathode powder. The heat treated and converted powders were characterized by TGA, XRD, FTIR, FESEM and TEM techniques. XRD analyses show formation of Mn3O4 and MnO2 phases for the heat treated and converted powders, respectively. FESEM images indicate the formation of porous nanoflower structure of MnO2, while, condensed aggregated particles are obtained for Mn3O4. The energy band gap of MnO2 is obtained from UV‒Vis spectra to be 2.4 eV. The electrochemical properties are investigated using cyclic voltammetry, galvanostatic charge‒discharge and electrochemical impedance techniques using three-electrode system. The specific capacitance of MnO2 nanoflower (309 F g−1 at 0.1 A g−1) is around six times higher than those obtained from the heat treated one (54 F g−1 at 0.1 A g−1). Moreover, it has high capacitance retention up to 93% over 1650 cycles. Impedance spectra of MnO2 nanoflower show very small resistances and high electrochemical active surface area (340 m2 g−1). The present work demonstrates a novel electrochemical approach to recycle spent zinc-carbon batteries into high value supercapacitor electrode

Item Type: Article
Uncontrolled Keywords: Spent batteries; Supercapacitance; Electrochemical conversion; MnO2 nanoflower
Subjects: Q Science > QD Chemistry
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Noorul Farina Arifin
Date Deposited: 15 May 2017 05:49
Last Modified: 17 Oct 2018 03:18
URI: http://umpir.ump.edu.my/id/eprint/17697
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