全固体Ag/AgCl电极的制备工艺研究

Fabrication of the all-solid-state Ag/AgCl electrode

探讨了制备全固体Ag/AgCl电极所用的AgCl前驱粉体的工艺技术,对其进行了形貌和物相分析,并对工艺改进后制备电极的短期稳定性、电化学噪声水平进行了测试。结果表明,以AgNO3和NaCl为原料,利用乙醇作为助磨剂,球磨8h后,利用冷冻干燥法所制备的AgCl粉体分散性极好,大小均匀,在490℃下烧结后所制备的Ag/AgCl复合电极一致性好,同种电极之间的极差电位约为0.006mV。该电极具有良好的短期稳定性能,电极电位波动量不超过0.080mV/24h,电极电压噪声密度在1Hz处可降低至8.34nV/Hz1/2。

The preparation technology of the precursor powder of AgCl used in Ag/AgCl electrode was discussed, which were characterized by scanning electron microscope（SEM） and X-ray diffraction（XRD）. And the short term stability and electrochemical noise of the prepared electrodes were carried out. Results show that the precursor powder of AgCl prepared by freeze-drying method, with AgNO3 and NaCl as raw materials, ethanol as grinding aids, milling time 8 h, is good in dispersion and uniform in size. The prepared Ag/AgCl electrode sintered at 490℃ has a good consistency and the potential difference of the two like electrodes is less than 0. 006mV. The electrode possesses good short term stability, with a potential difference drift of less than 0. 080mV/24h. The voltage noise density of electrode decreases to 8. 34nV/Hz1/2 at 1 Hz.