Electrochemical reaction of riboflavin at carbon nanotubes/Ni composite modified electrode fabricated by composite electrodeposition of carbon-nanotubes and Ni matrix

Abstract

The paper focuses on the electrochemical behavior of riboflavin (vitamin B2) at carbon nanotubes/Ni composite modified electrode fabricated by composite electrodeposition of carbon nanotubes and Ni matrix. Cyclic voltammetry is used to compare the electrocatalysis activity of the carbon nanotubes/Ni composite modified electrode and the conventional carbon nanotubes modified electrode. The carbon nanotubes/Ni composite modified electrode exhibits a marked enhancement of the current response and a reduction of the voltage peak difference. The oxidation–reduction reactions for different pHs and different riboflavin concentrations are discussed. In phosphate buffer solution, there is a good linear relationship between oxidation and reduction peak current and riboflavin concentration in the range from 10−4 to 10−6 mol/L with a detection limit of 3.5 × 10−7 mol/L. After 50 CV cycles in riboflavin, the relative standard deviation is only 4.71% for the voltage peak, which indicates that the carbon nanotubes/Ni composite modified electrode has a good, reproducible and stable surface.