Comparative Studies on Electrocatalytic Activities of Chemically Reduced Graphene Oxide and Electrochemically Reduced Graphene Oxide Noncovalently Functionalized with Poly(methylene blue)

Abstract

This study compares the electrocatalytic activities of chemically reduced graphene oxide (crGO) and electrochemically reduced graphene oxide (erGO), which are both noncovalently functionalized with a polyaromatic dye, poly-(methylene blue) (polyMB), toward the oxidation of b-nicotinamide adenine dinucleotide (NADH). PolyMB-crGO and polyMB-erGO composites were obtained via electropolymerization of methylene blue on crGO and GO modified glassy carbon (GC) electrodes, respectively. Cyclic voltammetry (CV) results indicate that these two types of integrated electrodes reveal different electrocatalytic activities. PolyMB-crGO integrated electrode possesses lower catalytic oxidation potential, suggesting higher catalytic activity. The present study is helpful for the understanding and screening of graphene-based advanced carbon nanomaterials for potential electrochemical applications.

Synthesis of graphene/methylene blue/gold nanoparticles composites based on simultaneous green reduction, in situ growth and self-catalysis

“…1a) shows the broad peak at 3398 cm -1 which is assigned to the O-H stretching vibration. The other characteristic absorption peaks at 1727, 1219, and 1052 cm -1 which correspond to the stretching of C=O (carbonyl), C-OH, and C-O (alkoxy) bonds, respectively, are also observed [35,44]. All these peaks serve as the evidence for the existence of oxygen-containing groups on GO.…”

“…It can be seen that, there is only one oxidation peak of MB can be observed at about -0.3 V in PBS solution without analytes (Fig. 8a) [12,42,44]. With the addition of 500 lmol L -1 AA, there appears its oxidation peak at about 0 V (Fig.…”

Optical monitoring of faradaic reaction using single plasmon-resonant nanorods functionalized with graphene

“…Herein, we consider that the observed blueshift exclusively resulted from the faradaic reaction induced electron injection into single GNRs by solvated reductant (Fig. 26 The reduction process was verified by electrochemical scattering and EIS characterization. In this case, the bulk scattering wavelength for the nanoparticles solely depends on the electron density and the effective mass of electrons.…”

Graphene for Detection of Adenosine Triphosphate, Nicotinamide Adenine Dinucleotide, Other Molecules, Gas, and Ions

“…Using graphene as a good substrate, various materials have been incorporated with graphene to form hybrids with tailoring and tunable properties for electrochemical NADH determination, including IL [30,31], methylene blue [32,33], methylene green [34], AuNPs [35,36], metal-nitride [37], TiO 2 [38], MWCNTs [39], and PEDOT:PSS [40]. Our group firstly exploited IL-functionalized graphene (IL-graphene) [41] for low-potential NADH detection [31].…”