The electrolysis current performance strongly depends on the electrolyte solution temperature, applied voltage and not clearly depends on electrolyte solution concentration. With high current performance and uniformity products, the cathodic reduction of potassium permanganate is promising method for manganese dioxide fabrication. | Vietnam Journal of Science and Technology 55 (5B) (2017) 34-39 STUDY ON THE PREPARATION OF MANGANESE DIOXIDE VIA CATHODIC ELECTROLYSIS Trung-Dung Dang School of Chemical Engineering, Hanoi University of Science and Technology, 1st Dai Co Viet, Hai Ba Trung, Ha noi, Vietnam Email: Received: 1 August 2017; Accepted for publication: 5 October 2017 ABSTRACT A novel synthesis method was developed to prepare manganese dioxide via cathodic electrolysis in potassium permanganate solution. The morphology and the composition of the synthesized products were analyzed by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction spectroscopy (XRD). The electrolyzed products include two kinds of materials: amorphous and crystalline manganese dioxide. The manganese dioxides were formed by cathodic reduction via two reaction mechanisms: direct and indirect electrochemical reactions. The electrolysis current performance strongly depends on the electrolyte solution temperature, applied voltage and not clearly depends on electrolyte solution concentration. With high current performance and uniformity products, the cathodic reduction of potassium permanganate is promising method for manganese dioxide fabrication. Keywords: manganese dioxide, potassium permanganate, cathodic electrolysis, amorphous, crystalline. 1. INTRODUCTION Manganese dioxides have attracted attention due to their wide applications in different fields such as catalysis, ion-sieves, rechargeable batteries, chemical sensing devices, and microelectronics [1]. There are two methods: chemical and electrochemical processes to synthesize manganese dioxides. The chemical process to prepare manganese dioxide includes the oxidation of Mn(II) in basic solution, or oxidation by MnO4-, O2, K2S2O8, and H2O2, or by reduction of MnO4- using different routes [2 - 5]. Most of chemical methods produced amorphous manganese oxides which are needed to post-treat at .
