Electrochemical preparation method of silver wire sensing electrode
A sensing electrode and electrochemical technology, which is applied in the field of electroanalysis and detection, can solve the problems of poor stability and reproducibility, poor electrochemical activity, cumbersome preparation process of nano-powder state particles, etc., and achieve good binding force and high activity. Effect
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Embodiment 1
[0022] The surface treatment method of high-purity silver wire with a diameter of 0.5 mm is as follows: immerse the silver wire in acetone, ultrasonically clean it for 5 minutes, wash it with water at 30 °C, and then immerse it in HCl:CH 3 CH 2 OH:H 2 Etch in a mixed solution of O = 2:1:1 (mass ratio) for 60 seconds, control the temperature at 30°C, take it out, wash it with running water, and then wash it with warm water at 60°C, and use a polishing solution at 60°C for chemical polishing. Polishing 1 minute, described polishing liquid is Cu(NO 3 ) 2 :urea:HNO 3 :H 2 o 2 :H 2 O = a mixture of 1:1:2:2:4 (mass ratio), and finally wash the polished silver wire with running water to obtain a surface-treated silver wire.
[0023] The surface-treated silver wire was used as the working electrode, the platinum wire (0.5 mm in diameter) was used as the auxiliary electrode, and Ag / AgCl was used as the reference electrode, and placed in a 10 mL electrolytic cell with a stirring ...
Embodiment 2
[0026] Ten sets of high-purity silver wire electrode surface treatment methods are according to the method of embodiment 1, after degreasing-water washing-etching-hot water washing-polishing-water washing, the diameter of each set of silver wire electrodes is 0.5 mm, and the opposite electrode is platinum wire ( 0.5 mm in diameter), in a 10 mL electrolytic cell with a stirring device, add different template molecules and 0.2 M potassium nitrate solution. Table 1 lists the electrical analysis detection results of activated silver wire sensing electrodes prepared from different template molecules in the activation solution.
[0027] No. 1 is that the template molecule in the activation solution is acetic acid, the concentration is 0.5 M, and the voltammetry scanning is activated for 10 weeks. After the completion, a silver-white porous nano-silver membrane electrode is obtained. The electrode was taken out, washed with running water, and stored in absolute ethanol solution. Usi...
Embodiment 3
[0040] Polish the electrode serial number 4 that has completed electroanalysis detection in Example 2 with metallographic sandpaper, rinse it with deionized water, and perform fine surface treatment again. The method is as follows: immerse the silver wire of serial number 10 in acetone, and ultrasonically clean it for 5 After 30 minutes, wash with water at 30°C, and then immerse in HCl:CH 3 CH 2 OH:H 2 Etch in a mixed solution of O = 2:1:1 (mass ratio) for 60 seconds, control the temperature at 30°C, take it out, wash it with running water, and then wash it with warm water at 60°C, and use a polishing solution at 60°C for chemical polishing. Polishing for 1 minute, the polishing liquid is Cu(NO 3 ) 2 :urea:HNO 3 :H 2 o 2 :H 2 O = a mixture of 1:1:2:2:4 (mass ratio), and finally wash the polished silver wire with running water to obtain a surface-treated silver wire.
[0041] Put the surface-treated No. 4 silver wire as the working electrode, platinum wire (0.5mm in dia...
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