| The excessive consumption of traditional fossil fuels has aggravated the environmental problems and energy crises that human beings are currently facing.As a result,sustainable energy storage and conversion systems,such as fuel cells,metal-air batteries and solar cell etc have attracted significant attention.Oxygen reduction reaction（ORR）is an indispensable cathodic reaction in fuel cells,but its sluggish kinetics of ORR has limited the widespread commercialization of fuel cells.Currently,Pt-based materials are considered to be the most effective ORR catalysts,but they are difficult to achieve large-scale applications due to its limited reserve,high cost and poor stability.Therefore,developing economical catalysts with rich resource,good stability and catalytic activity comparable to Pt has become an interesting research direction.（1）In this paper,urea was used as C and N source,and cobalt salt and manganese salt were used as metal precursors to synthesize N-doped carbon nanotubes containing manganese and cobalt（Mn/Co-BNCNTs）in nitrogen environment.The microstructure and chemical composition of the Mn/Co-BNCNTs were characterized by scanning electron microscopy,high resolution transmission electron microscope,X-ray diffraction,X-ray photoelectron spectroscopy and Raman spectroscopy.At the same time,cyclic voltammetry,linear sweep voltammetry and chronoamperometric testing were used to evaluate the ORR catalytic activity of Mn/Co-BNCNTs in alkaline media.（2）Cu-N-C was successfully synthesized as ORR catalyst by pyrolysis of a mixture of urea,glucose and Cu salt in N2 atmosphere.The morphology,chemical composition and pore size distribution of the Cu-N-C were characterized by a series of analytic methods,and the catalytic activity,stability and methanol tolerance of the Cu-N-C were evaluated in alkaline medium.The results show that the content of pyridinic N in the catalyst could be increased by the introduction of Cu.（3）The Co Ni-LDH/Co Ni/r GO complex with flower-like structure was successfully synthesized by hydrothermal method and used as ORR catalyst for the first time.The combination of Co Ni-LDH and r GO not only improved the electrical conductivity,but also increased the specific surface area of the complex.The morphology,surface chemical composition and specific surface area of Co Ni-LDH/Co Ni/r GO were analysed by a series of methods.The results show that Co Ni-LDH/Co Ni/r GO has the ORR catalytic activity. |
