氧阴极节能环保制备电解二氧化锰新方法

摘要

The electrolytic manganese dioxide (EMD) production in using graphite or copper hydrogen evolution cathode is high energy consumption, pollution and risks. To keep anodic reaction unchanged, a theoretically cell voltage cut of 1. 229 V can be obtained through the introduction of the electrolysis cell based on a gas diffusion cathode (GDE) of the green oxygen reduction reaction. Meanwhile, the acid mist will be reduced on the cathode. Studying the new synthetic method of EMD in using oxygen cathode for energy saving and environment friendly, it is confirmed that the cell voltage and energy consumption of new method by using GDE ( Pt/C type) will be 1/3 ~ 1/2 of that by using Cu and Pt cathode, compared with the traditional Cu and Pt hydrogen evolution cathode, at the current density of 20 ~ 140 A o m-2. XRD analysis shows that the anodic deposition of the powder belongs to γ -MnO2. The new method has obtained patent licenses.%采用石墨、铜等析氢阴极进行电解二氧化锰(EMD)生产时存在高耗能、环境污染、安全隐患等问题,用高电位的气体扩散电极(GDE)等氧阴极代替传统的析氢阴极,在阳极反应不变的情况下,可以使传统EMD方法的理论槽电压降低1.229 V,同时阴极不会析出氢气也可减少酸雾的产生.对此“节能环保型氧阴极电解二氧化锰新方法”的研究证实:阴极用GDE后,在电流密度范围20 ～ 140 A/m2,与传统Cu和电催化活性特别好的Pt析氢阴极反应电解槽相比,使用Pt/C型GDE氧还原阴极反应EMD新方法的槽电压和能耗仅为他们的1/3 ～ 1/2.对阳极沉积出的粉末进行XRD分析也表明是所要求的EMD(γ-MnO2).新方法已取得专利授权.