| With the depletion of fossil fuels and the environmental degradation,it is urgent to develop replaceable and high-efficiency energy devices.Among various energy conversion devices,direct methanol fuel cells（DMFCs）are extensively explored and stimulate widespread interest due to their high power density,low startup temperature and the flexibility for storage and transfer.Nevertheless,the electrochemical performance of DMFCs greatly depends on the choose and fabrication of the anode catalyst.Up to now,platinum（Pt）-based catalysts,considering their excellent performance in catalysis,is still regarded as the most efficient anode catalyst.However,the powerful adsorption of intermediate substances on the Pt surface during the methanol oxidation（MOR）results in the inactive kinetics reaction of Pt,which restricts their application.In addition,the scarcity and high cost of Pt also hinders Pt’s large-scale commercial application.Therefore,it is crucial to decrease the overall use amount of Pt while maintaining a high catalytic activity level.Two main methods are employed to solve the above problems:enhance the intrinsic activity of Pt-based catalyst and decrease the poison of Pt during the MOR.The way to improve the intrinsic activity of Pt catalyst is selected carbon-based materials with good stability and large specific surface area as a substance material to support the small size and even distribution of Pt nano-particles（NPs）.Uniform distribution and small size of Pt NPs are favorable to expose more available catalytic active sites so that increase the intrinsic activity of Pt catalyst.Moreover,to weaken the poison of Pt catalyst,a lot of research has focused on introducing another metal compound as co-catalyst.The introduced co-catalysts include transition metal oxides,nitrides,carbides and phosphides.On the basics of the bifunctional mechanism,The existence of electronic effect between these co-catalysts and Pt and the oxygen functional groups from the water can significantly weaken the poison of Pt catalyst.Based on the above,the main contents of this article are as follows:we designed the metal-organic frameworks（MOFs）derived N-doped carbon coated CoP nanoparticles/carbon nanotube Pt-CoP-NCZ/CNT catalyst through grew Co Zn-ZIF on multi-walled carbon nanotubes（MWCNTs）and then obtained CoP-NCZ/CNT composite by the carbonization and phosphorization treatment.Afterwards,the catalyst was produced through microwave-assisted Pt supporting.SEM and TEM analysis declare the existence of even dispersion and small size of CoP NPs,which are conductive to achieve the good electric interaction with Pt and improve their efficiency for dissolution of water.XPS analysis testify the appearance of N-doped structure and the N-doped structure can improve the conduction of substrate materials and promote the distribution of Pt NPs.Furthermore,BET analysis reveals the large specific surface area of the catalyst,where the large specific surface area come from the combination of CNT and MOFs and the pores generated by the evaporation of Zn2+into Co Zn-ZIF at high temperature.The XRD pattern and TEM analysis prove the successful assembly of Pt NPs.In addition,the results of electrochemical test show that the composite catalyst exhibit excellent mass activity in both acid(930 m A·mg-1)and alkaline(3622.5 m A·mg-1)environments as well as good CO-tolerance capability and stability.The bimetal phosphide N-doped carbon/carbon nanotube Pt-based catalyst（Pt-Fe CoP-NC/CNT）was produced by mixing the MWCNTs with ferric salt and cobalt salt,subsequent phosphorization treatment and microwave-assisted Pt supporting synthesis,in which the MWCNTs is regarded as the substrate materials.Scanning electron microscopy（SEM）,X-ray diffraction（XRD）illustrate that the catalyst possesses small uniform distribution of bimetal phosphide and Pt NPs.Notablely,the composite catalyst exhibits excellent mass activity and long time stability examined by the cyclic voltammetry and chronoamperometry. |
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