In Situ FTIR and in Situ QMB Study of the Electrochemistry of Graphene Oxide on Platinum

The cathodic and anodic behavior of graphene oxide was investigated in aqueous suspensions on platinum. The anodic deposition relied on the polyanionic character of graphene oxide with increasing pH. It took place simultaneously with the oxidation of phosphate to peroxodiphosphate and the oxygen evolution. Scanning electrochemical microscopy showed an inhomogeneous anodic adsorption. The cathodic deposition is based on the reduction of graphene oxide to reduced graphene oxide, which showed reduced solubility. Anodic oxygen evolution led to the desorption of graphene oxide anions, whereas hydrogen evolution blocked further adsorption of reduced graphene oxide but caused no desorption.