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利用固相反应球磨法以及不同的干燥法制备AgCl超微粉体,将其按一定比例与纳米Ag粉体均匀混合、造粒、压制成模并烧结,获得复合的Ag/AgCl多孔电极。并利用SEM、XRD、电化学工作站和低噪声前置放大器自制电噪声测试装置,对其进行微观结构分析和各种电化学性能测试,讨论多孔性结构对电极的极化性能、电极极差、短期稳定性以及电化学噪声水平影响。结果表明:利用冷冻-干燥法所制备的AgCl粉体分散性极好,大小均匀,所制备的复合Ag/AgCl结构呈多孔状,电极的交换电流密度大,不易极化;两电极一致性好,极差电位小,约为–0.2744mV;电极具有优良的短期稳定性,电极电势波动量不超过0.0477mV/24h,在低频段电极的自噪声降至纳伏级水平,为水下微伏级的微弱电场测试提供了极为有利的测试基础。
AgCl nanopowder was prepared by solid-state reactive ball milling method and different drying methods. The AgCl nanopowder was uniformly mixed with nano-Ag powder in a certain proportion, granulated, pressed into mold and sintered to obtain a composite Ag / AgCl porous electrode. Electronical noise test equipment was fabricated by SEM, XRD, electrochemical workstation and low noise preamplifier. Microstructure analysis and various electrochemical performance tests were carried out. The polarization performance of the porous structure on the electrode, Short-term stability and electrochemical noise level. The results show that AgCl powder prepared by freeze-drying method has excellent dispersivity and uniform size. The composite Ag / AgCl prepared by the freeze-drying method has a porous structure with large exchange current density and poor polarization. , The potential difference is small, about -0.2744mV; electrode has excellent short-term stability, the electrode potential fluctuations of not more than 0.0477mV / 24h, the low-frequency electrode self-noise down to the nanovolt level, underwater micro-volts Faint electric field test provides a very favorable test basis.