Facile Synthesis of Three-Dimensional Graphene Nanomaterials via Supercritical Fluid for Oxygen Reduction Reaction

摘要

The considerable interest in polymer electrolyte membrane fuel cells (PEMFCs) has sparked a sustained research effort on more active and reliable oxygen reduction reaction (ORR) electrocatalyst. 3D porous architectures featured by higher specific surface areas and larger pore volumes have received great interest, which not only maximize the availability of electron transfer within nanosized electrocatalyst surface area but also provide better mass transport of reactants to the electrocatalyst. Supercritical CO_2 (scCO_2) process offers an elegant and efficient route for the synthesis and processing of novel nanocomposite materials. Herein, we developed the ScCO_2 technique to synthesize boron-doped 3D graphene and low Pt group metal-based graphene/PtFe with 3D porous nanostructures. Significantly, these 3D nanocomposites show excellent electrocatalytic activity and high stability for the ORR, holding great promise for the development of PEMFCs.