高温氯化物熔体参比电极

来源期刊：中国有色金属学报1998年第4期

论文作者：谢中 刘业翔

文章页码：668 - 672

关键词：参比电极； 氯化物融体； 融盐电化学

Key words：reference electrode; chloride melts; molten salts electrolysis

摘    要：在等摩尔的KCl和NaCl熔体中研究了Ag/AgCl、金属Pt丝和石墨等参比电极的性能。Ag/Ag⁺半电池置于带侧部支管一端封闭的石英管内，分别以石棉、惰性石墨和Pt作为隔膜盐桥；金属Pt丝和光谱纯石墨外套石英管直接插入熔体。实验测试结果表明石墨或Pt作盐桥可有效地防止熔体混熔，所制备的Ag/AgCl参比电极具有不对称电势小、稳定性和互换性好等优点，是高温氯化物熔体电化学研究用理想的可逆参比电极；裸Pt丝和石墨棒在高温氯化物熔体中具有良好的长期稳定性，是高温氯化物熔体电极过程动力学研究中简单实用的准参比电极。

Abstract: The behaviors of Ag/AgCl（10%）, Pt wire and graphite rod in fused equimolar NaCl-KCl as reference electrodes were investigated at 700 ℃. Quartz glass is served to isolate the electrode compartment of Ag/AgCl half cell, with graphite or Pt to maintain electrolytic contact. The bare Pt and graphite rod were immersed in chloride melt directly. The testing result showed that the Ag/AgCl electrode is well electrochemically reversible and reproducible, with asymmetrical potential less than 5 mV over a period of 6～8 h. It can be employed as a convenient and stable reversible reference electrode. The Pt wire and graphite rod dipped in melt can keep steady electrode potential for more than 12 hours, but show electrochemically irreversible; both of them can be used as pseudo reference electrodes for the study of electrode reaction kinetics as their simpliness, convenience and easy operation.