Preparation method for hydrogel electrode

A preparation method for a hydrogel electrode, the preparation method comprises the following steps:

• (1) preparing a mold for a preparation of a hydrogel electrode molding;
• (2) washing an electrode support with isopropanol, ethanol, and deionized water in turn and drying the electrode support thoroughly, and then treating the electrode support with a plasma surface processor;
• (3) assembling and fixing the electrode support and an Ag/AgCl button to the mold;
• (4) injecting a prepolymer solution of an adhesive hydrogel and a prepolymer solution of a conductive hydrogel into the mold in turn, and obtaining a hydrogel electrode with conductive and substrate-adhesion double layers after being taken out from the mold after curing.
• Step (2) also comprises a functionalization step:
• placing the electrode support immediately in a functional solution for functionalization after using the plasma surface processor, incubating the electrode support at room temperature, cleaning, and drying;
• the functional solution is any one of 3-(trimethoxysily)propyl methacrylate solution, benzophenone solution and 1,6-hexanediamine solution;
• the electrode comprises the conductive hydrogel, the adhesive hydrogel, the electrode support, and the Ag/AgCl button;
• one end of the conductive hydrogel penetrates the electrode support and is connected to an inner wall of the electrode support by the adhesive hydrogel;
• the adhesive hydrogel is combined with a conductive layer and the electrode support through chemical bonds to avoid an influence on a use of semi-dry electrodes caused by interface delamination and friction between the hydrogel material and the support;
• the Ag/AgCl button is arranged on a bottom of the electrode support and in contact with the conductive hydrogel;
• a preparation method for the prepolymer solution of the conductive hydrogel comprises the following steps:
• dissolving sodium alginate, acrylamide, potassium chloride, N,N,N′,N′-tetramethylethylenediamine, N,N′-methylenebisacrylamide, calcium sulfate, ammonium persulfate, glycerol, Lipidure, poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) in deionized water, preparing the prepolymer solution of conductive hydrogel by mixing uniformly after ultrasonic degassing;
• a concentration of sodium alginate is 2 wt %, a concentration of acrylamide is 8-16 wt %, a concentration of potassium chloride is 0.5-1.5 mol/L, a concentration of N,N,N′,N′-tetramethylethylenediamine is 0.2 % vol, a concentration of N,N′-methylenebisacrylamide is 0.066-0.330 wt %, a concentration of calcium sulfate is 0.26 wt %, a concentration of ammonium persulfate is 0.04 wt %, a concentration of glycerol is 15 % vol, a concentration of Lipidure is 5-50 % vol, and a concentration of poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) is 15 % vol.