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4266821 
Journal Article 
Effect of temperature on the electrochemical synthesis of MnO2 recycled from spent Zn-MnO2 alkaline batteries and application of recycled MnO2 as electrochemical pseudocapacitors 
Carvalho, BB; Pegoretti, VCB; Celante, VG; Dixini, PVM; Gastelois, PL; Macedo, WAA; Freitas, MBJG 
2017 
1 
Materials Chemistry and Physics
ISSN: 0254-0584
EISSN: 1879-3312 
196 
126-136 
WOS:000403625800015 
Manganese oxide was electrochemically synthesized from spent zincmanganese oxide alkaline batteries. The recycled MnO2 was then used as electrochemical pseudocapacitors. According to Raman spectroscopy, X-Ray Diffraction and XPS analysis primarily alpha-MnO2 films were grown at 25 C and 80 C, under galvanostatic conditions (i = 10 mAcm(-2)) and at a charge density of 1.0 Ccm(-2). A charge efficiency of 88.0% was obtained in the anodic electrodeposition of MnO2 at 25 C and 80 C. The effect of temperature on the anodic electrodeposition and the film capacitance was evaluated by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy. The alpha-MnO2 film grown at 80 C exhibited a porous surface, and higher specific capacitance of 367.30 F g-1 at 1.0 mV(-1) and 386.30 F g(-1) at 1.25 A g(-1). The alpha-MnO2 film grown at 25 C showed a specific capacitance of 66.80 F g(-1) at 1.0 mV(-1) and 127.06 F g(-1) at 1.25 A g(-1). (C) 2017 Elsevier B.V. All rights reserved. 
Manganese dioxide; Pseudocapacitor; Electrochemical synthesis; Recycling; Alkaline batteries