Silver/silver chloride powder solid electrode and preparation method

A solid electrode and silver chloride technology, which is applied in the field of biomedicine and electrochemical sensors, can solve the problem that the quality of silver chloride is difficult to control accurately and conveniently, and achieve high electrode potential stability, accurate and reliable detection, and strong anti-interference performance Effect

Active Publication Date: 2007-12-12
段晏文
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the process contains corrosive media, and the quality of the silver chloride produced is difficult to control accurately and conveniently.

Method used

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  • Silver/silver chloride powder solid electrode and preparation method
  • Silver/silver chloride powder solid electrode and preparation method

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment one. Get the AgNO of 1.2g 3 (Analytical pure) was dissolved in distilled water to make a silver nitrate aqueous solution with a concentration of 0.02M, and 10g of Ag powder (average particle size 80μm) was added to the silver nitrate aqueous solution, stirred to disperse evenly to obtain Ag / AgNO 3 decentralized system. 0.4 g of NaCl (analytical pure) was formulated into a 0.1 M aqueous solution and added to the Ag / AgNO3 dispersion system under stirring. Stop stirring after the reaction is over, take the upper clear liquid and use silver nitrate and potassium chloride to detect whether there are excessive chloride ions and silver ions, if there are excessive ions, pour off the water layer and wash it with distilled water until there are no excessive reaction ions Appear. Finally, the water layer is poured off, and the reacted product is dried in an oven at a temperature of about 80°C. The ratio of the Ag / AgCl prepared in this way is about 1:0.1 in mass rati...

Embodiment 2

[0027] Embodiment two: get the AgNO of 3.5g 3 (Analytical pure) was dissolved in distilled water to make a silver nitrate solution with a concentration of about 0.5M, and 1g of Ag powder (average particle size of 1 μm, 99.95%) was dispersed in the silver nitrate solution system with a stirrer. Make the dispersion even. 1.1 g of NH 4 Cl (analytical pure) was made into a 0.2M solution and added dropwise to Ag / AgNO with a dropping funnel while stirring. 3 in a dispersed system. The following steps are the same as in Example 1. The ratio of Ag / AgCl thus prepared is approximately 1:3 by mass. Use 7500kg / cm of the prepared powder and fine silver wire in the mold 2 The pressure is pressed to form the electrode material 1 embedded with silver wire 2 as shown in Figure 2, and it is sintered in an electric furnace at 430° C. for 5 minutes. Then the silver wire 2 is welded to the wire 3 and packaged with epoxy resin 4 . The electrode was potentiostatically reduced (-0.1 V, SCE) in...

Embodiment 3

[0028] Embodiment three. Get the AgNO of 2.4g 3 (Analytical pure) was dissolved in distilled water to form a silver nitrate aqueous solution with a concentration of 0.05M, and 1g of Ag powder (average particle size of 1 μm, 99.95%) was dispersed in the silver nitrate solution system with a stirrer. Make the dispersion even. 1.05 g of KCl (analytical pure) was made into a KCl aqueous solution with a concentration of 0.3 M, and was added into the Ag / AgNO3 dispersion system with a dropping funnel while stirring. The following steps are the same as in Example 1. The ratio of Ag / AgCl prepared in this way is about 1:2 in mass ratio and 1:1.5 in converted molar ratio. Use 4500kg / cm2 The pressure is pressed to form the electrode material 1 embedded with silver wire 2 as shown in Figure 2, and it is sintered in an electric furnace at 250° C. for 15 minutes. Then the silver wire 2 is welded to the wire 3 and packaged with epoxy resin 4 .

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Abstract

The invention discloses a method for preparing a novel silver / silver chloride powder solid electrode, which comprises mixing fine silver powder with particle diameter less than 100 mu m with silver nitrate solution and chloride solution to give dispersive micro powder, molding in dies, sintering, and chemical and electrochemical treating to give solid electrode. The electrode has highly dispersed electrochemical interface, high anti-interference ability, high electrode potential stability, and convenient mechanical treatment. The electrode can accurately reliably detect bioelectric signal, be used as medical electrical stimulation electrode and bioelectric recording electrode, and can also be used as electrochemical reference electrode.

Description

technical field [0001] The invention relates to a silver / silver chloride powder solid electrode and a manufacturing method thereof, which belongs to the field of biomedicine and electrochemical sensors, and is suitable for bioelectricity recording and electrical stimulation electrodes, and electrochemical reference electrodes. Background technique [0002] Silver / silver chloride (Ag / AgCl) electrode is a common reference electrode, which has the advantages of high exchange current density, low polarization, low impedance, and constant electrode potential (small DC drift). Because it can accurately detect bioelectrical signals, the Ag / AgCl electrode has been widely used in EEG detection, EMG detection and cardiac Electrical detection. Ordinary Ag / AgCl electrodes are prepared by electrochemical chlorination or direct chlorination. During the use of such electrodes, the AgCl film on the surface is prone to abrasion, which affects the stability and service life of the electrodes...

Claims

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Application Information

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IPC IPC(8): A61B5/04G01N27/30
Inventor 段晏文
Owner 段晏文
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