Polymer of intrinsic microporosity (PIM-1) enhances hydrogen peroxide production at Gii-Sens graphene foam electrodes

[Display omitted] •Oxygen gas binding into PIM-1 as a factor in electrochemical reduction of oxygen.•Generator–collector voltammetry with printed electrodes under controlled gas atmosphere.•First quantitative evaluation of gas storage in PIM-1 in aqueous environment.•Enhanced hydrogen peroxide production at graphene foam electrodes. 3D-graphene foam electrodes (Gii-Sens) immersed in a phosphate buffer solution of pH 7 are shown to generate hydrogen peroxide at a significantly faster rate in the presence of a nanoparticulate polymer of intrinsic microporosity (PIM-1). The effect is demonstrated to be associated at least in part with oxygen binding into PIM-1 under triphasic conditions. The release of the oxygen at the electrode|solution interface quadruples H2O2 production. Generator–collector experiments are performed with a graphene foam disk generator and a platinum disk electrode collector to allow in situ detection of hydrogen peroxide and oxygen.