SEM/EDX ANALYSIS OF ELECTROLYTIC MANGANESE DIOXIDE DEPOSITS.

Article abstract of DOI:10.1016/0013-4686(85)85010-6

The morphology change of electrolytic manganese dioxide deposits and their surface analysis were investigated using SEM and EDX. Manganese dioxide was deposited on the anode from a manganese sulfate solution (95 degree C) containing H//2SO//4 or both H//2SO//4 and HCl at current densities ranging from 1 to 3 A dm** minus **2. In the course of the electrolysis, a rapid increase in the anodic potential was observed after a certain electrolysis time, depending upon current densities and bath composition. Some deposits, rich in sulfur, were observed on the surface of the fine manganese dioxide deposits which were obtained before and after the abrupt potential change. These observations suggest that the participation of the SO//4**2** minus ion in the solution is important in the anodic deposition process of electrolytic manganese dioxide.