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在0.25 mol/L醋酸锰溶液中,不同阳极极化电位下,将二氧化锰电沉积到经过处理的石墨电极上。经过碱性溶液中45 d的陈化处理,测量了陈化后电极体如下的性质:开路电位、抵抗微电流极化能力、微观结构、循环伏安行为和电极电位的一致性。结果表明,制作的参比电极电极体在测试龄期的90 d内表现出了很好的电位稳定性,当通过小电流时发生了很小的极化现象。电沉积层中不同MnO2/MnOOH摩尔比是导致各电极电位不一致的主要原因。为了提高电极沉积层的稳定性,选择0.5 V(vs SCE)作为制作电极体的阳极极化电位。
In 0.25 mol / L manganese acetate solution, manganese dioxide was electrodeposited onto the treated graphite electrode under different anodic polarization potentials. After aging for 45 days in alkaline solution, the properties of aged electrode were measured as follows: open circuit potential, resistance to micro-current polarization, microstructure, cyclic voltammetry and electrode potential. The results show that the fabricated reference electrode has a good potential stability within 90 d of the test period, and a very small polarization occurs when passing a small current. The different MnO2 / MnOOH molar ratio in the electrodeposited layer is the main reason for the inconsistency of electrode potentials. In order to improve the stability of the electrodeposited layer, 0.5 V (vs SCE) was chosen as the anodic polarization potential of the electrode body.