A taurine-functionalized 3D graphene-based foam for electrochemical determination of hydrogen peroxide

Abstract

Abstract(#br)We present a synthesis approach of taurine-functionalized graphene foam (a-NSGF) using hydrothermal reduction, freeze-drying and high temperature annealing. The higher temperature in annealing allowed the N/S atoms of taurine enter into the graphene lattice, which improves its electrocatalytic activity greatly. The a-NSGF consisting of taurine that modified into 3D layers of graphene and endow is of the rapid sensitive to hydrogen peroxide (H 2 O 2 ). The electrode using a-NSGF modification reveals highly sensitive and stable towards the concentration change of H 2 O 2 due to the stable 3D structure and good electrical conductivity of a-NSGF. A linear correlation between H 2 O 2 concentration and the electrochemical signal is found to be in a range from 1.5 to 300 μM and the correlation coefficient is R 2 = 0.999. The modified electrode has been applied in the determination of H 2 O 2 in rain samples and the results have been compared with the China National Standard Method. The recoveries range from 94.6% to 106.7%. These results show that the proposed sensor is promising for the development of novel electrochemical sensing for H 2 O 2 determination.