High performance MnO2 nanoflower supercapacitor electrode by electrochemical recycling of spent batteries

被引:106
作者
Ali, Gomaa A. M. [1 ,2 ]
Yusoff, Mashitah M. [1 ]
Shaaban, Essam R. [3 ]
Chong, Kwok Feng [1 ]
机构
[1] Univ Malaysia Pahang, Fac Ind Sci & Technol, Gambang 26300, Kuantan, Malaysia
[2] Al Azhar Univ, Chem Dept, Fac Sci, Assiut 71524, Egypt
[3] Al Azhar Univ, Phys Dept, Fac Sci, Assiut 71524, Egypt
关键词
Spent batteries; Supercapacitance; Electrochemical conversion; MnO2; nanoflower; MANGANESE OXIDE; BIRNESSITE MNO2; CO3O4/SIO2; NANOCOMPOSITES; ALKALINE BATTERIES; ZINC-CARBON; FILMS; CONVERSION; RECOVERY; DIOXIDE; MN3O4;
D O I
10.1016/j.ceramint.2017.03.195
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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 m(2) g(-1)). The present work demonstrates a novel electrochemical approach to recycle spent zinc-carbon batteries into high value supercapacitor electrode.
引用
收藏
页码:8440 / 8448
页数:9
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