冰晶石-氧化铝熔体中SnO2基惰性阳极上氧的超电压
来源期刊：中南大学学报(自然科学版)1982年第3期
论文作者：刘业翔 J.Thonstad
文章页码：66 - 74
关键词：惰性阳极； 超电压； 冰晶石； 铝熔体； 电流密度； 电极过程； 电催化作用； 阳极极化曲线； 掺杂电极； 金属氧化物电极
摘 要：电解炼铝采用不消耗的情性阳极有可能把目前的能耗减少20%。介绍了组成（重量%）为96%SnO2%Sb2O2%CuO 的 SnO2基情性电极的制备与掺杂方法.用稳态恒电位法及脉冲技术,对1000℃下2.7NaF·AlF3-Al2O3（饱和）熔体中 SnO2基情性阳极上氧析出的超电压作了测定.发现掺有微量 Ru,Fe 和 Cr 的电极具有明显的电催化作用。以掺 Ru 者最显著,在1.0安培/厘米2下,其上超电压仅及未掺杂者的1/3。在电流密度高达4.0安培/厘米2时也小于0.15伏。上述掺杂电极比相同条件下 Pt 阳极上的超电压为低。
Abstract: Oxygen overvoltage on SnO2-based inert anodes made of 96 wt% SnO2 +2wt% Sb2O3+2wt% CuO was measured in 2.7 NaF.AIF3—Al2O3 （sat.） melts at 1000℃ by a steady state potentiostatic method.Prior to use,the sintered electrodes were dipped into solutions containing doping agents.Doping with Ru,Fe and Cr showed a marked electrocatalytic effect.Ru was the most effective,the overvoltage at 1 A/cm2 being only about one third of that for undoped electrodes,and the value was as low as 0.15 v even at 4 A/cm2.Also, the overvoltage on those doped electrodes above mentioned was lower than that on platinum anodes.
