78 results about "Chemically modified electrode" patented technology

The invention discloses a chemically modified electrode, preparation of the chemically modified electrode and a method for rapid determination of acid value of plant oil, which belong to the technical field of the rapid determination of the acid value of the plant oil. The chemically modified electrode is a platinum electrode modified by perchlorate ion-doped polypyrrole. Electro-polymerization is carried at an electrochemical working station by adopting constant potential and circular scanning technology, so that a perchlorate ion-doped pyrrole polymer is formed on the surface of the platinum electrode. Pyrrole monomers are polymerized on the electrode by an electro-chemical method and doped with ions at the same time to ensure that the electrode has a catalytic effect on a reduction reaction of unsaturated fatty acids and conducts a current of the reaction simultaneously, so that the acid value of the plant oil can be calculated according to the value of the current. The modified platinum electrode prepared by the electro-polymerization by adopting the constant potential and circular scanning technology has high stability and high repeatability; and when the method is used for determining the acid value of the plant oil, the color and luster or the turbidity of an oil sample exert no interference with the determination of a voltammetric current, the required amount of the oil sample is relatively small, and the sensitivity and the accuracy are superior to those of the traditional titration and the potentiometric titration.

The invention discloses a method for preparing a graphene chemically modified electrode through in-situ growth, which mainly comprises the following steps: (A) substrate cleaning; (B) in-situ growth of graphene: placing the substrate obtained by the step (A) in a clean quartz boat, and placing the quartz boat in a quartz tube of a horizontal resistance furnace; introducing argon to remove oxygen in the quartz tube; under the protection of the argon, heating the quartz tube to the growth temperature of graphene; preserving heat for 1-180 minutes while introducing carbon source gas and hydrogen instead; then, cooling to room temperature under the protection of argon, and taking out a product to obtain a substrate with in-situ grown graphene; (C) connecting the substrate with graphene of in-situ growth, obtained by the step (B), with a wire or directly putting the substrate into a clamp to obtain the graphene chemically modified electrode. The preparation process of the method is simple, the preparation efficiency is high, and the method is suitable for large-scale production; the prepared graphene chemically modified electrode has good quality and excellent detection performance.