(中南工業(yè)大學(xué)有色冶金系， 長(zhǎng)沙 410083)
摘 要: 在等摩爾的KCl和NaCl熔體中研究了Ag/AgCl、金屬Pt絲和石墨等參比電極的性能。Ag/Ag+半電池置于帶側(cè)部支管一端封閉的石英管內(nèi)，分別以石棉、惰性石墨和Pt作為隔膜鹽橋；金屬Pt絲和光譜純石墨外套石英管直接插入熔體。實(shí)驗(yàn)測(cè)試結(jié)果表明石墨或Pt作鹽橋可有效地防止熔體混熔，所制備的Ag/AgCl參比電極具有不對(duì)稱電勢(shì)小、穩(wěn)定性和互換性好等優(yōu)點(diǎn)，是高溫氯化物熔體電化學(xué)研究用理想的可逆參比電極；裸Pt絲和石墨棒在高溫氯化物熔體中具有良好的長(zhǎng)期穩(wěn)定性，是高溫氯化物熔體電極過(guò)程動(dòng)力學(xué)研究中簡(jiǎn)單實(shí)用的準(zhǔn)參比電極。
關(guān)鍵字: 參比電極 氯化物融體 融鹽電化學(xué)
（Department of Nonferrous Metallurgy,Central South University of Technology, Changsha 410083, P. R. China）
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.
Key words: reference electrode chloride melts molten salts electrolysis
