在LiCl-KCl-NaCl熔盐体系中碳的阴极还原的研究

The Gathodic Reduction of Carbon from LiCl-KCl-NaGl Molten Salts

用循环伏安法和电位阶跃法研究了LiCl-KCl-NaCl熔盐体系中碳的阴极还原机理。在钨、铂、不锈钢等微电极上得到的伏安图表明碳的还原是由CO32-离子经一步电化学反应实现的,电极反应速度控制步骤为CO_(3)^(2-)离子向阴极的扩散过程,还原过程具有反应物吸附特征。碳在W、Pt、不锈钢电极上析出电位分别为-2.05V、-1.745V和-1.90V(均相对于Ag/AgCl参比电极)。

The electrochemical behaviour of carbon in diluted carbonate solution of LiGl-KCl-NaCl eutectic melt at 723K was studied by using cyclic, voltamme try arid chronoamperometry.It has been confirmed" that a single reduction wave was generally observed at E=-1. 745V (platinum) , -1.90V (stainless, steel) and -2.05V ( tungsten) w.r-t. Ag/Ag (Ⅰ) and it was thought to be co_(3)^(2-)+4e→C+3O_(2).The voltammogram showed that the process was irreversible, diffussion-controlled reduction and was accompanied by adsorption phenomena of the reactant.