▎ 摘　　要

A new strategy for designing the morphology and the chemical/physical properties of carbon structures is developed by functionalization of porous carbon templates. In a thermal decomposition procedure self-prepared multilayer-graphene foams (GF) are coated with a nitrogen-containing carbon layer (NCL) which has a porous structure. The use of a nitrogen rich ionic liquid as precursor generates a NCL with a very high nitrogen level of 35.3 wt%. To the best of our knowledge, this is the first synthesis of a hierarchical structured N-GF with such a high nitrogen amount. Structural studies on the NCL confirm C5N and C3N4 species. Compared to uncoated GF it could be demonstrated that the functionalized porous carbon template (N-GF) has an increased electronic conductivity and electrochemical stability. Electrochemical characterizations of polymer electrolyte membrane fuel cells (PEMFC) prepared with Pt catalysts supported on N-GF show an increased performance which is attributed to improved mass transport properties and higher electronic conductivity of the porous composite material. Morphological, structural, chemical, and electrochemical characterizations were performed. (C) 2017 Elsevier Ltd. All rights reserved.