High performance MnO2 nanoflower supercapacitor electrode by electrochemical recycling of spent batteries |
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| Affiliation: | 1. Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Gambang, 26300 Kuantan, Malaysia;2. Chemistry Department, Faculty of Science, Al-Azhar University, Assiut 71524, Egypt;3. Physics Department, Faculty of Science, Al-Azhar University, Assiut 71524, Egypt;1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, PR China;2. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China;2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400030, China;3. Department of Applied Physics, Chongqing University, Chongqing 400044, China;1. School of Chemistry and Chemical Engineering, Bohai University, Jinzhou, Liaoning 121013, China;2. School of Urban and Environmental Sciences, Northeast Normal University, Changchun, Jilin 130024, China;1. LAQV/REQUIMTE, Chemical Engineering Department, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal;2. Industrial Engineering, Department Biochemistry-Microbiology, KaHo St.-Lieven, Gent, Belgium |
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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. |
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| Keywords: | Spent batteries Supercapacitance Electrochemical conversion |
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