Exploration of manganese doped prussian blue in energy storage to design supercapacitor and in optical sensor to detect glutathion

Abstract

In the present work, the Prussian blue (PB) and manganese doped Prussian blue (MnPB) materials were synthesized via simple reflux procedure at 60ºC temperature. The as-synthesized samples were characterized by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Fourier transform infra-red spectroscopy (FTIR), UV Visible spectroscopy, photoluminescence spectroscopy. The structural study was conducted for XRD in a 2θ mode from 10º to 80º. The crystal morphologies of the prepared samples were observed using FESEM. The framework crystalline structure constructed with cyanide ligands was verified using FTIR analysis. Ultraviolet−Visible spectral study was recorded to understand the electronic structure and to calculate the optical band gap of the prepared samples. The electrochemical measurement cyclic voltammetry (CV) of all samples was performed. Mn:PB delivered the highest specific capacitance in aqueous 0.5M Na2SO4 electrolyte. The total charge storage included both outer and inner contributions to the specific capacitance. The higher value of inner contribution to the specific capacitance suggested that the redox reaction play a dominating role in storing the charges. We believe that the observable results show future perspectives to develop superior, cost effective and eco-friendly asymmetric supercapacitor. Manganese is sensitive to glutathoin which can show a visible difference in photoluminescence spectroscopy and UV Vis spectroscopy.Mn doped prussian blue can be used in glutathoin sensor.