Solid-state reference electrode and preparation method thereof

Abstract

The invention provides a solid-state reference electrode and a preparation method thereof. The solid-state electrode is applicable to oxidation-reduction potential measurement of an all-vanadium flow battery electrolyte; the solid-state reference electrode comprises a silver plate, a silver sulfate membrane, an ion exchange membrane, a lead and an electrode housing; the silver sulfate membrane coats the silver plate; the silver sulfate membrane and the silver plate form a reference electrode body; the reference electrode body is put into the electrode housing; one end of the reference electrode body is connected with the lead, and is used for exporting oxidation-reduction potential measurement data of the all-vanadium flow battery electrolyte; and the other end of the reference electrode body is connected with the ion exchange membrane, and is used for measuring the oxidation-reduction potential of the all-vanadium flow battery electrolyte. Therefore, the solid-state reference electrode is conveniently arranged in an engineering flow pile pipeline system; the potential of the electrode is stable for a long period of time; and in-situ online monitoring of the ORP potential is achieved.

Description

technical field [0001] The invention relates to the field of electroanalytical chemical monitoring, in particular to a solid-state reference electrode and a preparation method thereof. Background technique [0002] All-vanadium redox flow battery is an energy storage device for regulating power fluctuations in the process of wind energy, solar energy and other forms of energy generation. It has the advantages of high power and deep charge and discharge, and is a safe and green large-scale energy storage technology. The determination of the state of charge (SOC) of the flow battery can provide a basis for the operation control of the battery and the maintenance and management of the electrolyte. The technology of measuring the SOC of the positive and negative electrolytes by monitoring the potential difference of the positive and negative electrolytes of the battery (potential difference method), or the potential of the positive and negative electrolytes (electrode potential ...

AI Technical Summary

Problems solved by technology

[0004] (1) Since the positive electrode electrolyte of the all-vanadium redox flow battery is a strong acid and strong oxidizing solution, the negative electrode chamber is filled with an inert protective gas, and the pressure is relatively high. The commonly used glass reference electrode contains a reference solution that is placed in the vanadium sulfate system for a long time Diffusion will occur in the medium, and the reference solution needs to be taken out and replaced in time, so the commonly used reference electrode cannot be used for a long time

[0005] (2) Although there are currently commercially available reference electrodes suitable for sulfuric acid media, such as mercury sulfate or mercurous reference electrodes, most of them are designed for laboratory tests, and their size and structure cannot meet the needs of engineering installations. Cannot be installed in the positive and negative electrolyte piping system of all-vanadium redox flow battery

[0006] (3) The commonly used solid-state reference electrodes are mainly silver / silver chloride electrodes. However, both positive and negative electrodes of vanadium batteries contain sulfuric acid with high concentration, which will lead to unstable potential of silver / silver chloride reference electrodes.

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