Study on the modification mechanism of Ag/AgCl marine electric field detection electrode by graphene/silver nanoparticle
AC impedance,scanning electron microscopy,water absorption and potential stability test were carried out for Ag/AgCl electrodes modified by graphene/nano silver with different content.The experimental results show that with the increase of graphene/nano silver content,the interface structure parameter Cdl-P of the modified Ag/AgCl electrode increases,the capacitance value Cdl-T decreases,and the dynamic characteristic parameter charge transfer resistance Rct first decreases and then increases.The electrode dynamic characteristic information and interface structure information obtained based on AC impedance test are basically consistent with the scanning electron microscope,water absorption and potential stability test results of the electrode.The modification of Ag/AgCl electrode by graphene/nano silver is mainly reflected in three aspects:improving the surface uniformity and conductivity of the electrode,and reducing the porosity of the electrode.The synergistic effect of these three aspects reflects the internal mechanism of the modification of Ag/AgCl electrode by graphene/nano silver.
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