Hydrogen palladium electrode electrochemical oxygen sensor

Abstract

The present invention relates to an electrochemical oxygen sensor, in particular to a hydrogen palladium electrode electrochemical oxygen sensor, comprising a hollow shell, an electrode base is sealed and installed on the upper end of the shell, an oxygen permeable film is covered on the lower end of the shell, and the electrode base A coaxial cylindrical double electrode body is arranged between the oxygen permeable membrane. The outer layer of the cylindrical double electrode is a hydrogen palladium electrode as an anode, the middle layer is glass as an insulating layer, and the inner layer is a platinum electrode as a cathode; The working end surface of the electrode body is in contact with the oxygen-permeable membrane; the electrolytic chamber between the shell and the cylindrical double-electrode body and between the electrode base and the oxygen-permeable membrane is filled with a gel electrolyte, which includes the following proportional weight The combination of parts: 70-79 parts by weight of potassium chloride, 4-5 parts by weight of agar, and 1000 parts by weight of water. The metal electrode of the sensor does not participate in the electrochemical reaction, and the reaction product is water, no metal precipitation, no coating shedding, long-term stability of the electrode potential, longer life of the oxygen sensor, and superior long-term stability.

Description

technical field [0001] The invention relates to an electrochemical oxygen sensor, in particular to an electrochemical oxygen sensor based on a hydrogen-palladium electrode. Background technique [0002] The oxygen sensor has a simple structure, high sensitivity, and is easy to use. It is a widely used environmental oxygen concentration monitoring method. It is used in some confined spaces and industrial occasions, such as aerospace vehicles, ship cabins, mines, etc., and the measurement is accurate. There are three main types of oxygen sensors that have reached the practical level, namely oxide semiconductor oxygen sensors, solid electrolyte oxygen sensors and electrochemical oxygen sensors. Among them, the oxide semiconductor oxygen sensor is based on the change of the oxygen partial pressure in the external atmosphere will cause the change of the resistance of the oxide semiconductor. There are many materials that can be used to manufacture the oxide semiconductor oxygen s...

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Problems solved by technology

However, during the long-term working process, the anode metal participates in the reaction, resulting in a significant change in state, resulting in a drift in the electrode potential of the electrode, which in turn leads to a deviation in the oxygen concentration signal; at the same time, Ag / AgCl, Hg / Hg 2 Cl 2 As a reference electrode and anode, during the long-term working process, the precipitation of metal particles reduces the insulation properties of the cathode and anode, resulting in sensor failure, so that the current life of the electrochemical oxygen sensor has not been effectively resolved.

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