Preparation method and application of modification electrode

Abstract

The invention discloses a preparation method and application of a modification electrode. According to the preparation method, a polysulfanilic acid modified graphite electrode is prepared, the electrochemical behavior of o, m and p-nitrophenol on the electrode is studied through a cyclic voltammetry method, and a cyclic voltammetry curve is subjected to semi-differential treatment, so that the sensitivity and the separation degree of the electrode are further improved. The result shows that in a phosphate buffer solution of which the pH value is 8.00, the modified electrode has a remarkable function in distinguishing electrochemical oxidation of three isomers and a function of remarkably improving the current sensitivity. Compared with a naked graphite electrode, according to the graphite electrode, the differences of two adjacent oxidation peak potentials between o-nitrophenol and p-nitrophenol and between p-nitrophenol and m-nitrophenol are respectively increased to be 90mV and 155mV from 80mV and 133mV, and meanwhile the measurement sensitivity is remarkably improved, the peak current and the concentration of components are in relatively good linear response, and the electrode is good in reproducibility and stability.

Description

technical field [0001] The invention relates to the preparation and application of a modified electrode, in particular to a preparation method and application of a polymer film modified electrode. Background technique [0002] Chemically Modified Electrode (CME for short) is the use of physical or chemical methods to modify the surface of the substrate electrode to form a film with expected specific functions. The traditional electrochemistry is no longer limited to the study of the bare electrode / electrolyte interface, but artificially controls the structure of the electrode surface from the chemical state, thereby promoting the kinetic theory of the electrode process, and has catalytic, electrochromic, photoelectric, surface Effects and functions such as coordination, switching and rectification, enrichment and separation, molecular recognition, stereoscopic organic synthesis, doping and release. Based on the advantages of simple operation, fast method, high sensitivity a...

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Problems solved by technology

[0010] (4) Concentration of the modifier: If the concentration of the modifier is too low, the polymerization reaction is not easy to occur, or the surface of the electrode is not completely modified, and the modification time is too long

Too high a scan speed can lead to instability of the polymeric film

[0013] (7) The number of polymerization circles: Too few polymerization circles will lead to incomplete modification of the surface of the substrate electrode, and too many polymerization circles will make the polymer film too thick and affect its electrocatalytic performance

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