新型海洋用全固态Ag/AgX复合参比电极的性能

Performance of New Type All-Solid Ag/AgX Composite Reference Electrode for Marine Environment

以聚苯胺(PANI)和聚吡咯(PPy)为电极添加剂,采用粉末压片法制备了Ag/AgX/PANI和Ag/AgX/PPy参比电极,在模拟海洋环境中进行了稳定性、温度响应特性、恒流极化和线性极化等性能测试。结果表明:Ag/AgX/PANI和Ag/AgX/PPy电极都具有与纯Ag/AgX电极同等优异的电位稳定性,且温度系数由0.36 mV/℃分别降低至0.27 mV/℃和0.26 mV/℃;在±5μA/cm^(2)恒电流密度条件下,两种复合电极电位均在1 h内达到稳定,其中Ag/AgX/PPy电极的电位漂移值更小,这与线性极化结果相一致;Ag/AgX/PPy电极在静态和动态海洋环境中的电位波动值在0.30 mV左右,进一步表明了Ag/AgX/PPy电极是一种有潜力的新型海洋用全固态复合参比电极。

The Ag/AgX/PANI and Ag/AgX/PPy reference electrodes were prepared by powder pressing method with polyaniline(PANI)and polypyrrole(PPy)as additions,and their performance of stability,temperature response characteristic,constant current polarization and linear polarization were tested in simulated marine environment.The results showed that Ag/AgX/PANI andAg/AgX/PPy electrodes had the same excellent potential stability as pure Ag/AgX electrode,and their temperature coefficient were reduced from 0.36 mV/℃to 0.27 mV/℃and 0.26 mV/℃,respectively.Under the constant current density condition of±5μA/cm^(2),the stable time of the two composite electrode potentials was within 1 h,and the potential drift value of Ag/AgX/PPy electrode was smaller,which was consistent with the results of linear polarization.The potential fluctuation value of Ag/AgX/PPy electrode in static and dynamic marine environments was about 0.30 mV,which further indicated that it can be a promising new type of all solid-state composite reference electrode for marine applications.