External pressure-balance type Ag/AgCl reference electrode and preparation method thereof

Abstract

The invention discloses an external pressure-balance type Ag / AgCl reference electrode and a preparation method thereof. A porous ceramic pillar is located at the bottom of a cavity of a pressure cavity body and connected with the inner wall of the lower part of the cavity of the pressure cavity body by a first O-shaped sealing ring, the upper end face of the pressure cavity body is in close contact with a compression ring by an external nut, the lower end of the compression ring is provided with a taper hole, a circular-truncated-cone-shaped sealing element is arranged in the taper hole, an Ag / AgCl wire electrode is inserted in an internal reference substance in the pressure cavity body until extending to the upper end face of the porous ceramic pillar, and an electrode lead is led out through an axial through hole in the circular-truncated-cone-shaped sealing element located in the taper hole at the lower end of the compression ring and an axial through hole in the compression ring. According to the invention, a problem that various existing Ag / AgCl reference electrodes are inapplicable to high-temperature and high-pressure hydrothermal systems at a temperature and pressure range of 400-700 DEG C and 40-100 MPa can be solved, and a problem that samples are polluted and streaming potentials and use occasions are limited can be solved.

Description

technical field [0001] The invention relates to an Ag / AgCl reference electrode used for electrochemical measurement and electrochemical sensor of a high-temperature and high-pressure hydrothermal system and a preparation method thereof, belonging to the technical field of electrochemical measurement. Background technique [0002] In electrochemical measurements and electrochemical sensors, the reference electrode is a reference for reading the potential values ​​of other electrodes, so it plays a very important role. In aqueous solution at normal temperature and pressure, the commonly used reference electrodes mainly include calomel electrode, Ag / AgCl electrode, copper / copper sulfate electrode, high-purity zinc electrode, etc. The Ag / AgCl electrode is the most commonly used reference electrode in the electrochemical measurement and sensor of the high temperature and high pressure hydrothermal system because it is still all solid and stable in the high temperature and high pr...

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Problems solved by technology

[0026] The technical problem to be solved by the present invention is to provide an external pressure-balanced Ag / AgCl reference electrode for high-temperature and high-pressure hydrothermal systems to solve the current There are problems that various Ag / AgCl reference electrodes are not suitable for high temperature and high pressure hydrothermal systems in the range of 400-700°C, 40-100 MPa temperature and pressure, or there are problems of sample contamination, streaming potential and limited use occasions

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