亚硫酸铵对锰电解反应与析氢反应的影响

Effects of Ammonium Sulfite on Manganese Electrolysis Reaction and Hydrogen Evolution Reaction

采用CV、LSV等电化学方法研究了阴极电化学机制,同时通过SEM、XPS等表征方法考察亚硫酸铵对阴极表面、锰晶体结构的影响。结果表明:氢在不锈钢阴极表面析出和锰在不锈钢阴极表面沉积的起始电位分别为-0.95、-1.40 V;亚硫酸铵对析氢反应具有明显的抑制作用,降低锰沉积的电流,减小直流电耗。当亚硫酸铵用量为SeO_(2)的4倍时,锰沉积电流效率高达67.42%,亚硫酸铵有望成为替代SeO_(2)的添加剂。在沉积锰的小区域能谱图中,能捕捉到100%纯度的锰,利于后期高纯锰的研发。

The cathodic electrochemical mechanism was studied using electrochemical methods such as CV and LSV,and the effects of ammonium sulfite on structure of cathode surface and manganese crystal were investigated using analytical methods such as SEM and XPS.The results show that on the surface of the stainless steel cathode,the initial potential for hydrogen precipitation is -0.95 V,while the initial potential for manganese deposition is -1.40 V.Ammonium sulfite has a significant inhibitory effect on hydrogen evolution reaction,reducing the current of manganese deposition and DC power consumption.When the amount of ammonium sulfite is four times that of SeO_(2),the current efficiency of manganese deposition is as high as 67.42%,and ammonium sulfite is expected to become an additive to replace SeO_(2).In the small-scale energy spectrum of deposited manganese,100%purity of Mn can be captured,which is beneficial for the development of high-purity manganese in the later stage.