Composite electrode and preparation method and application thereof
A technology of composite electrode and electrodeposition method, which is applied in the direction of material electrochemical variables, material analysis by electromagnetic means, and measurement devices, can solve the problems of inability to detect dopamine at the same time, difficult to distinguish, etc., and achieve easy operation and improve detection efficiency. Effect
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Embodiment 1
[0082] In this embodiment, a composite electrode is prepared, and the specific process is as follows:
[0083] S1. Modified conductive substrate with polyaniline / graphene composite layer:
[0084] S1a. Prepare the first deposition solution: first add the graphene powder into the methanol solution, and ultrasonicate for 30 minutes to form a uniformly dispersed graphene dispersion with a concentration of 1 mg / mL;
[0085] For every 100 μL of graphene dispersion, add 10 mL of HCl solution (0.08 M) in proportion to add HCl solution, and sonicate for 3 hours to form a uniform suspension;
[0086] Then take 10 mL of the above suspension and add 70 μL of aniline (analytical pure liquid aniline), sonicate for 30 min to obtain the first sedimentation solution;
[0087] S1b. Deposition of polyaniline / graphene composite layer: using a three-electrode system, using planar gold (conductive substrate) as the working electrode, commercial Ag / AgCl as the reference electrode, and platinum she...
Embodiment 2
[0092] This embodiment prepares a kind of composite electrode, the specific difference with embodiment 1 is:
[0093] (1) In step S1b, loop 20 times.
Embodiment 3
[0095] This embodiment prepares a kind of composite electrode, the specific difference with embodiment 1 is:
[0096] (1) In step S2b, the deposition potential is -0.3V, and the deposition time is 180s.
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