Preparation And Electrocatalytic Properties Of The Porous,Heteroatom-doped Carbon-based Electrocatalyst

With the rapid economic development,people's demand for energy is increasing.The consumption of limited fossil fuels have led to serious environmental pollution and exposed humanity to the dual crisis of energy and environment.In order to balance the problems of human development and environmental protection,it is particularly important to develop new clean energy technologies.Fuel cells is regarded as a new clean energy technology because of its advantages of high energy conversion efficiency,high power density,relatively low operating temperature,lower noise and lower emissions,which is expected to replace fossil fuels.Electrocatalysts play a vital role in fuel cells.At present,precious metal(such as platinum)catalysts are the most widely used catalysts,but their large-scale usage is severely limited by high cost,scarcity,poor durability and poor tolerance to pollutants.Therefore,searching for low-cost,highly efficient electrocatalyt that can be used in new clean energy technologies has become one of the hot topics in scientific research today.Based on the goal of solving important scientific problems in the field of electrocatalysis,several high-performance electrocatalysts were prepared through the synthesis and regulation of non-precious metal catalytic materials.The research results and innovations are as follows:1.We synthesized the precursor by self-polymerizing aniline on the surface of C3N4 in the presence of iron phthalocyanine(FePc).Followed by carbonization,the as-obtained Fe,N co-doped nanosheet porous carbon(FeNSPC)possessed high specific surface areas and porosity,and exhibited excellent ORR catalytic performance in alkaline and acid media.2.We prepared N,S co-doped hierarchically porous carbon(NSHPC)by pyrolysis of the precursors of glucosamine hydrochloride and thiocyanuric acid using silica as templates.The obtained NSHPC showed excellent ORR catalytic performance in both alkaline and acidic media,and also good carbon dioxide reduction performance.We further used this newly developed NSHPC as cathode for PEMFCs,which exhibited a maximum power density of 276.3 mW cm-2.