The Effect Of Carbonaceous Debris On The Electrochemical Behaviors Of Graphene Oxide

Graphene oxide (GO) prepared from the chemical oxidization of graphite, contains lots of aromatic derivatives which are called carbonaceous debris. Recently, it is widely believed that GO prepared from the exfoliation of graphite oxide was actually a mixture of highly oxidized carbonaceous debris and poorly oxidized graphene sheets. The carbonaceous debris absorbed on graphene oxide have great influence on the electrochemical properties of graphene oxide. It has been proved that the catalytic effect of GO with debris is different from graphene oxide without debris when small molecules were adopted as probes using cyclic voltammetry to characterize GO. In addition, the capacitance, adsorption ability, and the ability to load metal particle of GO were also affected by carbonaceous debris. This paper includes the following contents:(1) Graphene oxide prepared by the modified Hummers method was treated with concentrated sodium hydroxide solution to remove the carbonaceous debris. Then graphene oxide with and without carbonaceous debris modified electrodes were immersed in 1,10-phenanthroline-5,6-dione (PD) solution, and PD could be firmly adsorbed on the surface of the electrodes. Then the composite material modified graphene oxide electrodes were used as electrochemical sensors. Cyclic voltammetry and chronoamperometry were adopted to characterize the electrodes for NADH oxidation including:adsorption capacity, limit of detection, sensitivity, linear range and the linear regression coefficient. We found that the graphene oxide removing of the oxidation debris has better analytical performance than graphene oxide containing debris.(2) Chloroplatinic acid was reduced by sodium borohydride, and graphene oxide was used as support material loading with platinum nanoparticles, and the obtained composite materials were used to catalyze methanol oxidation. We found that platinum nanoparticles dispersed on the graphene oxide with debris with smaller size, uniformity distribution. Moreover, graphene oxide with debris has better effect to catalyst methanol oxidation than the graphene oxide without debris.