Electrochemical Properties of MnO2 Nanoparticle Obtained from Waste Battery Powder by Reductive Acid Leaching Method

Abstract

The present work is focus on the recovery of manganese dioxide (MnO₂) nano particle from spent battery waste using ecofriendly leaching materials. The concentration of metals has been evaluated by using Atomic Absorption spectroscopy (AAS). The basic composition of recovered metals from dry cell batteries were confirmed by Energy Dispersive X-ray analysis (EDAX), X-ray Diffractometer (XRD), scanning electron microscopy (SEM), Fourier transform Infrared Spectroscopy (FTIR) respectively. The leaching studies shows both Zn and Mn were higher at 90°C and 4M sodium hydroxide was used as precipitating agent to recover Mn as MnO₂ nanoparticle. From electrochemical studies, cyclic voltammetry (CV) reveals the more reversibility of the electrode and electrochemical impedance spectroscopy (EIS) indicate charge transfer resistance (Rct) and capacitance of electrode. The electrode using 0.5M NaOH has lowest Rct and more capacitance among all the electrolytes, indicating better conductivity and confirmed that the charge transfer resistance and capacitive behavior is faster.