CN-122016974-A - Full-range lead-free oxygen sensor

Abstract

A full-range lead-free oxygen sensor comprises a shell, electrolyte arranged in the shell, a tin anode immersed in the electrolyte and a catalytic electrode, wherein an electrolyte adsorption film is arranged between the tin anode and the catalytic electrode. The electrolyte includes caustic alkali, carbonate, bicarbonate and thiosulfate. Because the alkaline electrolyte is adopted, the lead-free oxygen sensor is prevented from generating hydrogen evolution competitive reaction, and the accuracy of the lead-free oxygen sensor on oxygen concentration measurement is improved.

Inventors

• ZHANG BIN
• LI TING
• WU JUNHUI
• DONG QINJUN

Assignees

• 广州奥松电子股份有限公司

Dates

Publication Date

20260512

Application Date

20260206

Claims (10)

1. 1. The full-range lead-free oxygen sensor comprises a shell, electrolyte arranged in the shell, a tin anode immersed in the electrolyte and a catalytic electrode, wherein an electrolyte adsorption film is arranged between the tin anode and the catalytic electrode.
2. 2. The full-scale lead-free oxygen sensor according to claim 1, wherein the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.003 to 1:0.1:0.05.
3. 3. The full-range lead-free oxygen sensor of claim 2, wherein the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.003.
4. 4. The full-range lead-free oxygen sensor of claim 2, wherein the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.01.
5. 5. The full-range lead-free oxygen sensor of claim 2, wherein the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.05.
6. 6. The full-scale lead-free oxygen sensor of claim 1, wherein an oxygen permeable membrane is disposed on the housing at a position corresponding to the catalytic electrode.
7. 7. The full-range lead-free oxygen sensor of claim 1, wherein an anode pin is arranged on the side face of the shell, the tin anode is electrically connected with the anode pin through an anode wire, a cathode pin is also arranged on the side face of the shell, and the catalytic electrode is electrically connected with the cathode pin through a cathode wire.
8. 8. The full-scale lead-free oxygen sensor of claim 6, wherein the oxygen permeable membrane is a PTFE membrane.
9. 9. The full-scale lead-free oxygen sensor of claim 7, wherein the catalytic electrode is made of any one material of carbon, platinum, gold, silver, copper or an alloy material formed by a combination of any two or more materials.
10. 10. The full-scale lead-free oxygen sensor of claim 9, wherein the anode lead and/or the cathode lead are made of one of gold, silver, copper, or nickel or an alloy material formed by combining any two or more materials.

Description

Full-range lead-free oxygen sensor Technical Field The invention relates to the technical field of oxygen sensors, in particular to a lead-free oxygen sensor, and more particularly relates to a full-range lead-free oxygen sensor. Background The electrochemical oxygen sensor has the advantages of low cost, simplicity, convenience and capability of working at normal temperature, and has the advantages of high precision, stable performance, simplicity in operation, economy and the like, and is widely applied to the wide fields of inspection of anoxic states in a cabin and an access hole, detection of oxygen concentration in medical equipment such as an anaesthesia machine, a breathing machine and the like. An existing electrochemical oxygen sensor is a lead oxygen sensor and mainly comprises two electrodes, namely a Pt-C working electrode and a lead wire pressing block counter electrode, wherein the two electrodes are arranged in a container, and electrolyte which is used for placing the two electrodes in the container is arranged in the container, and the electrolyte is usually alkaline electrolyte. In existing electrochemical oxygen sensors, chemical energy is converted into electrical energy in an electrolyte based on the principle of a galvanic cell consisting of lead oxygen. However, lead materials are adopted in the sensor, which is a toxic heavy metal with great harm to human bodies. In the beginning of the century, ROHS instruction proposed in Europe requires limiting the application of lead in electronic and electric equipment, and corresponding regulations are also made in China on the "pollution control and management method of electronic information products". Therefore, the development of lead-free oxygen sensors is imperative. Later, the industry also adopts a lead-free oxygen sensor, and although the sensor solves the problems of environmental pollution and harm to human bodies, the lead-free oxygen sensor adopting the acid electrolyte is easy to generate hydrogen evolution competitive reaction according to the chemical activity sequence of metals, so that the lead-free oxygen sensor still outputs an electric signal under the anaerobic condition, and the accuracy of the lead-free oxygen sensor on oxygen concentration measurement is seriously influenced. Accordingly, there is a need in the industry to provide an improved lead-free oxygen sensor that overcomes the above-described deficiencies of the prior art. Disclosure of Invention The invention aims to solve the problems and provide a full-range lead-free oxygen sensor. In order to meet the aim of the invention, the invention adopts the following technical scheme: A full-range lead-free oxygen sensor comprises a shell, electrolyte arranged in the shell, a tin anode immersed in the electrolyte and a catalytic electrode, wherein an electrolyte adsorption film is arranged between the tin anode and the catalytic electrode. The electrolyte includes caustic alkali, carbonate, bicarbonate and thiosulfate. Preferably, the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.003 to 1:0.1:0.05. Preferably, the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.003. Further preferably, the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.01. Further preferably, the electrolyte comprises cesium carbonate, cesium bicarbonate and sodium thiosulfate, and the molar concentration ratio of the three is 1:0.1:0.05. Preferably, an oxygen permeable membrane is disposed on the housing at a position corresponding to the catalytic electrode. Preferably, an anode pin is arranged on the side face of the shell, the tin anode is electrically connected with the anode pin through an anode wire, a cathode pin is also arranged on the side face of the shell, and the catalytic electrode is electrically connected with the cathode pin through a cathode wire. Preferably, the oxygen permeable membrane is a PTFE membrane. Preferably, the catalytic electrode is made of any one material of carbon, platinum, gold, silver, copper or an alloy material formed by a combination of any two or more materials thereof. Further preferably, the anode wire and/or the cathode wire are made of one metal material of gold, silver, copper, or nickel or an alloy material formed by combining any two or more materials. Compared with the prior art, the invention has the following beneficial technical effects: In the full-range lead-free oxygen sensor provided by the invention, as the alkaline electrolyte is adopted, particularly the electrolyte containing cesium carbonate, cesium bicarbonate and sodium thiosulfate is adopted, and the three components have proper molar ratios, the risk of reducing the accuracy of oxygen concentration measurem