Metal-metallic oxide pH electrode and method for making same

An oxide and oxide film technology, applied in the direction of electrochemical variables of materials, etc., can solve the problem of standard electrode potential drift and resistance to oxidation/reduction substances. Equipment and targets are expensive and other problems, to achieve the effect of not easy to break, low price, easy to mass production

Inactive Publication Date: 2008-07-02
FUZHOU UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical cyclic voltammetry is the most widely used method to study the preparation of iridium oxide pH electrodes, but this method has the disadvantages of high preparation cost, complicated process conditions, and inability to carry out mass production; and the preparation of iridium oxide pH electrodes by electrodeposition There are relatively few studies. Generally, conductive substrates such as graphite, Ti, and Pt are used. The electroplating solution is chloroiridic acid, chloroiridic acid salt, and iridium chloride solution. The preparation cost is lower than that of Ir wire electrochemical cyclic voltammetry, but electroplating The liquid is relatively complex, and the process conditions are not easy to control
E~pH response sensitivity is shown as super Nernst response (>59mV/pH); sputtering deposition method to prepare iridium oxide pH electrode is another method that has been studied more, and the

Method used

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  • Metal-metallic oxide pH electrode and method for making same
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  • Metal-metallic oxide pH electrode and method for making same

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Ir / IrO x Fabrication of the pH electrode

[0027] (1) Put one end of a section of Ir wire matrix on sandpaper and grind it for 10 minutes, put the polished Ir wire into a 5% NaOH solution and boil for 20 minutes, then heat it to boiling in a concentrated HCl solution and keep it for 20 minutes, Finally, rinse with secondary water and place in absolute ethanol for later use.

[0028] (2) Coat 10 μL of 0.5 g / L ammonium iridite chloroiridite precursor solution on the surface of the treated Ir wire, dry it at 60 °C for 1 hour, repeat 3 times, and then place it in the muffle furnace with 2°C / min temperature programming, heating to 450°C, and keeping the temperature for 2 hours, then lowering to room temperature, sealing the side of the metal substrate Ir with insulating varnish to obtain Ir / IrO x pH electrode.

Embodiment 2

[0029] Example 2: Ti / IrO x Fabrication of the pH electrode

[0030] (1) Put one end of the Ti wire matrix with a diameter of 2mm on sandpaper for 10 minutes, put the polished Ti wire into 10% NaOH solution and boil for 5 minutes, then heat to boiling in concentrated HCl solution, and keep for 10 Minutes, finally rinsed with secondary water, placed in absolute ethanol for later use.

[0031] (2) Coat 10 μL of 0.1 g / L ammonium chloroiridite solution on the surface of the treated Ti wire, dry it at 80 °C for 0.5 hour, repeat 5 times, and then heat it in the muffle furnace at 0.5 °C / min temperature program, heated to 750 ° C, and kept at a constant temperature for 0.5 hours, then lowered to room temperature, and the side of the metal substrate Ti was encapsulated with insulating varnish to obtain Ti / IrO x pH electrode.

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Abstract

The invention provides a metal-metal oxide pH electrode and a preparation method thereof. The method comprises the following steps of: using a chemically stable metal filament is used as a basal body, removing the original oxide film on the surface of the metal filament by mechanical polishing and chemical cleaning, and forming a IrOx (x=1 to 3) active oxide film sensitive to hydrogen ion on the treated metal filament surface with the thermal decomposition method. Comparing with glass pH electrode and conventional metal-metal oxide pH electrode, the inventive metal-metal oxide pH electrode has the advantages of simples preparation method, low cost, easiness for batch production, high mechanical strength, low fracture liability, small volume, high sensitivity of pH measurement, and rapid response speed, wide response range; and is suitable for pH measurement of low-temperature solution with wide pH range, particularly solution below zero degree (such as anti-freezing fluid and refrigerating fluid).

Description

technical field [0001] The invention belongs to the technical field of electrode material and sensor manufacturing, and more specifically relates to a metal-metal oxide pH electrode and a preparation method thereof. Background technique [0002] The detection of pH has extensive practical application value in many fields such as environmental protection, ocean, medicine, medicine, food, light industry, textile, papermaking, agriculture, soil, petrochemical, chemical industry, metallurgy, machinery and so on. The pH meter is an indispensable experimental tool in the detection of pH. [0003] At present, the traditional glass pH electrode is mainly used to detect the pH value of the solution. It generally uses a very thin glass membrane as a sensitive membrane for hydrogen ions, so its glass membrane is very fragile and easily broken. With the increasingly wide range of fields that need to measure pH value, the adaptability of glass electrodes to different environments must b...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 孙建军谢瑜韦航陈国南
Owner FUZHOU UNIV
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