Electrocatalytic oxidation of kojic acid at a reduced graphene sheet modified glassy carbon electrode

Exploring the origins of the apparent “electrocatalytic” oxidation of kojic acid at graphene modified electrodes

“…It has been reported that chemically reduced graphene oxide (producing reduced graphene sheets (RGSs)) immobilised upon a GC electrode can be beneficial for the sensing of kojic acid. 24 Cyclic voltammetric responses were reported to be optimal when using the RGS modified GC electrode over that of a bare (unmodified) GC electrode and a graphite electrode towards the electrochemical oxidation of kojic acid, where it was noted that the peak current was 'faint' and 'not well identified' in the latter two cases. 24 Given that the presence of RGSs on the GC electrode greatly increased the peak current compared with the inverse case (when the RGSs are absent), the authors attributed this to indicate that the RGSs have a high electrocatalytic activity towards the electrochemical oxidation of kojic acid.…”

“…24 Cyclic voltammetric responses were reported to be optimal when using the RGS modified GC electrode over that of a bare (unmodified) GC electrode and a graphite electrode towards the electrochemical oxidation of kojic acid, where it was noted that the peak current was 'faint' and 'not well identified' in the latter two cases. 24 Given that the presence of RGSs on the GC electrode greatly increased the peak current compared with the inverse case (when the RGSs are absent), the authors attributed this to indicate that the RGSs have a high electrocatalytic activity towards the electrochemical oxidation of kojic acid. 24 Interested by this report, we first consider the electrochemical oxidation of kojic acid at various unmodified carbon based and graphitic electrodes.…”

Preparation and characterization of “clickable” polyaniline derivatives on graphene modified electrodes

“…The case of graphene is especially interesting since improved performance of graphene electrodes has been demonstrated in electrochemical polymerization [31] and sensing [32][33][34], due to its superior electrical conductivity and ultrahigh surface area. However the electrical conductivity and aspect ratio of graphene strongly depend on the method of graphene preparation.…”

“…5B), the current value at the peak maxima being 120 μA and 825 μA for Pt and Pt-G, respectively. This catalytic effect of the graphene modified electrodes could be explained by the superior electrical conductivity and high surface area of graphene [31][32][33][34]. However other factors like the affinity of monomer molecules for the electrode surface and/or aspects related to their adsorption on surfaces of different nature (orientation with respect to the surface, type of bond, etc.)…”

A Simple, but Highly Sensitive, Graphene-based Voltammetric Sensor for Salvianic Acid A Sodium

“…17 In the area of electroanalytical chemistry, much effort has been made to explore its electrocatalytic activity as electrode materials for purpose of highly sensitive analysis. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] For instance, it has been reported that graphene-based electrodes promote the electrochemical reaction of some small biomolecules, such as NADH, 18 ascorbic acid, 19 hydrogen peroxide, 20 dopamine 21 and DNA. 22 In this work, an electrochemical sensor based on reduced graphene oxide (rGO) for a highly sensitive determination of SAS was reported.…”