Mass transport studies during dissolved oxygen reduction to hydrogen peroxide in a filter-press electrolyzer using graphite felt, reticulated vitreous carbon and boron-doped diamond as cathodes

摘要

This paper describes the mass transport characterization of oxygen reduction reaction (ORR) to yield hydrogen peroxide at porous electrodes like graphite felt (GF) and reticulated vitreous carbon (RVC, 45 pores per inch) and at a boron-doped diamond (BDD) plate in the presence of a plastic net. A filter-press electrolyzer was used for the reduction of 0.24 mM of O-2 in the presence of 0.5 M of either Na2SO4 or 0.5 M NaClO4 as supporting electrolytes in water at pH 2.8. Linear differential pulse voltammetry (LDPV) was performed at different volumetric flow rates in the range 253-50.6 cm(3) s(-1). Cathodic polarization curves using GF, RVC and BDD revealed that ORR is limited by mass transport at -0.4