<報文>硝酸マンガン六水和物融液中での電極反応

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The anodic and cathodic reactions at Pt, Ti and carbon electrodes in Mn (NO_3)_2・6H_2O melt were studied at 60∿100℃ by the potential sweep method, the potential step method, constant potential electrolysis and constant current electrolysis. The possibility of MnO_2 production in this melt was also discussed. MnO_2 deposition is observed as only one anodic reaction in this melt. Anodic current efficiencies are as high as about 95% under any electrolytic condition. Both carbon and Ti, which are popular anode materials for MnO_2 electrolysis in MnSO_4 solution, can be used as an anode even in this melt. Treating their surface by our procedure, the carbon anode shows less overpotential in comparison with the Ti anode. Cathodic reactions in this melt are more complicated than the anodic reaction. Four cathodic reactions exist at the Pt electrode and three reactions at the carbon electrode. Some of the peak current densities increase with added amounts of HNO_3. Effects of HNO_3 addition on a voltammogram show that hydrogen ion is involved in some cathodic reactions. It is important to keep the cell voltage low and stable for MnO_2 electrolysis in this melt. The results from this study suggest that carbon is better than Ti as an anode material and that addition of HNO_3 is necessary and effective with regard to the cathodic reactions.MnO_2Mn(NO_3)_2・6H_2Oelectrolysisplatinumcarbonelectrochemistry
東北大学の論文
1991-03-29