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A kind of improved method of iridium/iridium oxide pH electrode stability

An iridium oxide and stability technology, applied in the field of improvement of iridium/iridium oxide pH electrode stability, can solve the problems of insufficient hydration, electrode potential drift, long hydration period, etc., to achieve enhanced reproducibility and sensitivity , The effect of stable electrode performance and good thermal stability

Active Publication Date: 2019-02-01
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional hydration process is to immerse the electrode in water at room temperature, but the hydration cycle of this method is relatively long, the degree of hydration is not sufficient in a short period of time, the electrode potential drifts seriously, and the reproducibility of multiple tests is poor. greatly limits its practical application

Method used

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  • A kind of improved method of iridium/iridium oxide pH electrode stability
  • A kind of improved method of iridium/iridium oxide pH electrode stability
  • A kind of improved method of iridium/iridium oxide pH electrode stability

Examples

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Effect test

Embodiment 1

[0016] (1) Polish a section of iridium wire with a length of about 2 cm to a bright finish with sandpaper, and then ultrasonically clean it in 3M HCl, acetone, and ultrapure water for 30 minutes each. Then the iridium wire was immersed in 5M NaOH solution and boiled for 1 h. In the muffle furnace, the temperature was programmed to rise to 800 °C at 5 °C / min, and the temperature was kept constant for 30 min. Repeat the dip-oxidation process 2 times. Scrape one end of the oxide film with a length of about 1∼2mm, and weld the platinum wire to draw out the ohmic potential, and coat the insulating resin on the welded part to obtain an iridium / iridium oxide pH electrode; its structure is as follows: figure 1 As shown in the figure, iridium oxide, 1; metallic iridium substrate 2; platinum wire 3; insulating coating 4;

[0017] (2) Put the iridium / iridium oxide pH electrode prepared in (1) in the polytetrafluoroethylene lining, add ultrapure water to it, keep the filling degree of t...

Embodiment 2

[0019] (1) Polish a section of iridium wire with a length of about 2 cm to a bright finish with sandpaper, and then ultrasonically clean it in 3M HCl, acetone, and ultrapure water for 30 minutes each. Then the iridium wire was immersed in 5M NaOH solution and boiled for 1 h. In the muffle furnace, the temperature was programmed to rise to 800 °C at 5 °C / min, and the temperature was kept constant for 30 min. Repeat the dip-oxidation process 2 times. Scrape one end of the oxide film with a length of about 1∼2mm, and weld the platinum wire to lead out the ohmic potential, and coat the welding place with insulating resin to obtain an iridium / iridium oxide pH electrode;

[0020] (2) Put the iridium / iridium oxide pH electrode prepared in (1) in the polytetrafluoroethylene lining, add ultrapure water to it, keep the filling degree of the reactor at 50%, and put it at 100°C The electrode was heated in water for 24 hours; a treated iridium / iridium oxide pH electrode was obtained.

Embodiment 3

[0022] (1) Polish a section of iridium wire with a length of about 2 cm to a bright finish with sandpaper, and then ultrasonically clean it in 3M HCl, acetone, and ultrapure water for 30 minutes each. Then the iridium wire was immersed in 5M NaOH solution and boiled for 1 h. In the muffle furnace, the temperature was programmed to rise to 800 °C at 5 °C / min, and the temperature was kept constant for 30 min. Repeat the dip-oxidation process 2 times. Scrape one end of the oxide film with a length of about 1∼2mm, and weld the platinum wire to lead out the ohmic potential, and coat the welding place with insulating resin to obtain an iridium / iridium oxide pH electrode;

[0023] (2) Put the iridium / iridium oxide pH electrode prepared in (1) in the polytetrafluoroethylene lining, add ultrapure water to it, keep the filling degree of the reactor at 80%, and put The electrode was hydrothermally hydrated for 12 hours; a treated iridium / iridium oxide pH electrode was obtained.

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Abstract

The invention discloses a method for improving the stability of an iridium / iridium oxide pH (potential of Hydrogen) electrode. The iridium / iridium oxide pH electrode is prepared through a cyclic thermal oxidation method; the heat preservation treatment is carried out on the electrode for 3h to 48h in a hydrothermal environment with a temperature of 100 to 250 DEG C and compactedness of 35 to 85 percent; the electrode subjected to the treatment has the advantages of being high in sensitivity, quick in response, good in repeatability, little in hysteresis, and the like. Problems of long hydration time, low efficiency, poor stability and the like existing in an iridium / iridium oxide electrode for a long term are effectively solved. An electrode improved through the method can be used at 25 to 150 DEG C, and has a wider usage temperature range.

Description

technical field [0001] The invention relates to the technical field of sensor analysis and testing, in particular to a method for improving the stability of an iridium / iridium oxide pH electrode. Background technique [0002] As a kind of all-solid-state electrodes, metal oxide electrodes have attracted wide attention due to their good mechanical properties, easy fabrication, light weight and portability. As a member of the platinum group metals, metal iridium has become one of the most promising metal materials for metal / metal oxide pH electrodes due to its good chemical inertness and less influence by redox ions. Common methods for preparing iridium / iridium oxide pH electrodes include electrochemical cyclic voltammetry, electrodeposition, sputtering, and thermal oxidation. Among them, the thermal oxidation method is widely used due to its simple preparation process, low cost, and convenience for mass production. However, the oxide film on the surface of the electrode pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/302
Inventor 李强王丹丹郑慧萍郑晓虹杜元生
Owner EAST CHINA NORMAL UNIV
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