The Structural Design Of All-solid-state Reference Electrode Used In Deep Marine And Its Electrochemical Performance

In marine engineering, in order to ensure safety and to avoid economic losses,potential of metallic structures is needed.It is necessary to have a reference electrodethat is exact and stable,which can display the real potential of metallic structures.Atpresent,Ag/AgCl and Zn reference electrode is the most widely used referenceelectrode in seawater,but drift of the potential can easily occure, the stability is not sogood on high pressure.It can not be used in deep-sea projects for long-term. In thispaper, in order to deal with the problems of reference electrode used now, Ag/AgXand Zn all-solid-state reference electrode structure is studied,according to theconditions of deep marine environment. The results show that the reference electrodesstudied have stability on high pressure,which can adapt to deep marine.The Ag/AgX electrode used in this article are made by using Press PowerMethod,The Zn electrode is made from zine with the Purity of99.99%.Usingelectrochemical method to get its stability on high pressure environment,then messurethe influence of temperature,pH,pressure,velocity of seawater on electrode on highpressure,and compare with it in normal pressure.The results show that under6MPapressure conditions,Ag/AgX electrode without pressure structural designment canmaintain stable in2h,2h later, potential like-100mV occur, electrode lose efficacy, ithas poor stability on high pressure conditions,it can not be applied to deep-seaenvironment for long-term. However,in the period of10d experiment,Ag/AgXelectrode with pressure structural designment has good stability at6MPa pressureconditions, the potential draft is less than3.0mV, the gap between it and potential onnormal pressure is less than2.0mV.The pressure structural designment improves theelectrode stability under high pressure conditions, so that the Ag/AgX electrodedeveloped in this paper can be used in deep-sea projects for long-term. The Zn electrode with pressure structural designment has good stability at6MPa pressureconditions,its potential is similar with that on normal pressure, the potential draft isless than10mV, Zn electrode with pressure structural design studied in this paper hasgood stability under high pressure conditions. Furthermore,Ag/AgX electrode,Znelectrode with pressure structural design studied in this paper has good responsecharacter of temperature,good anti-polarization performance,long service lifetime,theeffects by pH and water flow rate can be ignored. Then,design Ag/AgX-Zn electrodeon the basis of the structure of the reference electrode above, we can get electrode ofgood stability on high pressure,which can adapt the environment in deep marine.