Electro chemical and photo catalytic studies of MnO2 nanoparticle from waste dry cell batteries

Abstract

The objective of the existing research was essentially focused on recovery of MnO 2 nanoparticles from consumed dry cells by employing adapted hydrometallurgical process. Experimental tests for the recovery of MnO 2 present in the dry cell batteries have been carried out by an acidic reductive leachant, namely oxalic acid. The elemental compositions of the recovered metals from dry cells were confirmed by Energy Dispersive X-ray analysis (EDAX). Surface morphology of the recovered metals was examined using Scanning Electron Microscopy (SEM). Phase composition of the recovered metals from dry cell batteries were confirmed from X-ray Diffract meter (XRD). Cyclic Voltammetry (CV) studies were carried out to clarify the reversibility of the reactions. The obtained MnO 2 catalyst was applied for the degradation of different non-volatile dye compounds such as Indigo carmine (IC) and Rhodamine B (RB). The performance of MnO 2 shows fast degradation of dyes of high concentration.

Cyclic Voltammetry and Electrochemical Impedance Spectral Properties of MnO2 Obtained by Waste Discarded Batteries Using Eco-Friendly Leaching Materials

“…This is because of redox reactions depends on the insertion-deinsertion of the protons from the electrolyte. At sluggish scan rates, the dispersion of ions from the electrolyte can upgrading access to just about all presented pores on the electrode surface, leading to a whole Table-6 shows the reversibility [26,27] of electrode in 0.5 M NaOH is suitably more compared to lasting electrodes in 0.5 M NaOH electrolyte. Electrochemical impedance spectroscopy: The electrochemical impedance spectra (EIS) measurements were performed in order to further evaluate the electrochemical properties of MnO2 as shown in Fig.…”

Layer by layer synthesis of zinc-iron layered hydroxy sulfate for electrocatalytic hydrogen evolution from ethanol in alkali media

“…Also, compounds of various classes, called electrocatalysts, are used as electrode materials: oxides (hydroxides), sulfides, phosphides, nitrides, and etc. [19][20][21][22]. The advantage of electrocatalysts over pure metals or alloys is their high efficiency at a relatively low cost.…”