Graphene-xerogel-based non-precious metal catalyst for oxygen reduction reaction

Graphene-xerogel-based Co–N cathode catalyst (Co–N-GX) for the oxygen reduction reaction (ORR) was prepared through a simple approach. The Co–N-GX shows a more positive onset potential, higher cathodic density for the ORR in alkaline media than graphene-sheet-based Co–N catalyst (Co–N-GS), highlighting the importance of high specific surface area for improving the ORR performance. The proposed approach makes the Co–N-GX catalyst a non-precious metal cathode catalyst for fuel cells.

► Melamine promoted GO hydrogel was used to prepare high surface area graphene xerogel.
► The graphene-xerogel-based Co–N catalyst (Co–N-GX) shows excellent ORR activity.
► The high specific surface area plays a crucial role in ORR activity enhancement.
► The facile preparation and low-cost material have promising application in fuel cells.