Co supported on N and S dual-doped reduced graphene oxide as highly active oxygen-reduction catalyst for direct ethanol fuel cells

Oxygen reduction reaction (ORR) is one of the key features for efficient functioning several energy conversion devices such as fuel cells, appearing necessity development new low-cost catalyst materials. Heteroatom-doped carbon materials have attracted attention in this field due to its physicochemical and electronic properties. In work, a nitrogen sulfur doped material with anchored Co3O4 nanoparticles (Co/SN-rGO) proposed cathode direct ethanol cells (DEFCs) results are compared different graphene nanomaterials (GMs). The effect heteroatoms cobalt oxide final efficiency was studied. Synthesized were characterized activity Co/SN-rGO GMs ORR presents high performance terms onset potential (Eonset), 0.86 V (vs RHE) half-wave (E1/2) 0.72 RHE). Tafel analysis shows 60 mV dec-1 at low overpotential dependent mechanism. Besides, when evaluated DEFC using cell test station, main indicate higher catalytic activity, stability, tolerance comparison carbon-supported Pt catalyst.