Mechanisms of charge accumulation in electrochemical systems formed based on of nanoporous carbon and manganese oxide

M.I Kolkovskyi,S-V.S Sklepova,P.I Kolkovskyi,B.K Ostafiychuk,N.Ya Ivanichok,B.I Rachiy

doi:10.15330/pcss.21.4.621-627

Abstract

In this work, the processes occurring in electrochemical systems based on nanoporous carbon material and manganese oxide in an aqueous solution of lithium sulfate are analyzed. Furthermore, it is shows the feasibility of these materials combination cycling as electrodes of a hybrid electrochemical capacitor. The combination of electrode materials with different mechanisms of charge accumulation was determined. Consequently, an increase in the accumulated energy by more than 25% by the formation of an electric double layer and the occurrence of redox reactions based on carbon and manganese oxide respectively. The laboratory sample of an aqueous electrolyte hybrid electrochemical capacitor was formed. Moreover, the laboratory sample is electrochemically stable at an operating voltage of 2 V.

Highlights

It is urgent task today the optimization of the methodology for the synthesis of electrode materials of highly efficient electrochemical charge storage devices
According to the results of X-ray analysis, a monophase ultrafine phase α-MnO2 with a crystal structure of Mn4 + and O2- was formed using the hydrothermal methods of synthesis at a temperature of 180°C for 48 hours, (JCPDSno.42-1348) (Fig. 1)
Nanodispersed manganese oxide alpha form of predefined morphology was obtained by hydrothermal synthesis, in accordance with the redox reaction of 3MnCl2 + 2KMnO4 + 2H2O → 5MnO2 + 4HCl + 2KCl [9]

Summary

Vasyl Stefanyk Precarpathian National University

The processes occurring in electrochemical systems based on nanoporous carbon material and manganese oxide in an aqueous solution of lithium sulfate are analyzed. It is shows the feasibility of these materials combination cycling as electrodes of a hybrid electrochemical capacitor. An increase in the accumulated energy by more than 25 % by the formation of an electric double layer and the occurrence of redox reactions based on carbon and manganese oxide respectively. The laboratory sample of an aqueous electrolyte hybrid electrochemical capacitor was formed. The laboratory sample is electrochemically stable at an operating voltage of 2 V.

Introduction

Results and Discussion

Working electrodes were prepared by applying a

Sorption characteristics of AC

Specific characteristics of the HEC

Conclusion