Preparation And Application In Alcohol Fuel Cells Of Platinum Family Bimetallic Nanomaterials

Direct alcohol fuel cell（DAFC）are considered as an ideal renewable energy to solve the future energy crisis because of its high energy conversion efficiency,low working temperature,the feature of clean and environmental protection.Active and stable anodic catalysts are necessary for alcohol oxidation reaction.Platinum family noble metal catalysts are the most effective catalysts for alcohol oxidation,but their commercial application is limited by high price and low stability.It is of great significance for the development of direct alcohol fuel cells to explore a platinum family catalyst with low cost and high stability.Alloying platinum group noble metals with transition metals,effectively controlling the morphology and size of nanomaterials,and selecting appropriate catalyst supports are effective strategies to solve these problems.In this paper,platinum family bimetallic nanomaterials of nanowires and nanosheets were prepared by the addition of transition metals.The structure of the catalyst was characterized by various characterization,the growth mechanism of the catalyst and its catalytic performance for alcohol oxidation were studied.This paper mainly includes the following three parts:（1）Uniform Pt-Cu nanowires were prepared by hydrothermal method.The employments of Br^-and Brij58 as growth-direction and stabilization reagents were considered vital for achieving Pt-Cu nanowires.The structure of Pt-Cu nanowires was characterized by various characterization methods.In addition,by tracking the morphology of catalysts in different reaction stages,the growth process of Pt-Cu nanowires was studied in detail,and the mechanism of lattice-matched oriented attachment growth mechanism was proposed.The preparation method is simple and environmentally friendly,in addition it can be produced on a large scale.It was found that Pt-Cu nanowires had high activity and stability for methanol oxidation.（2）Pd-Fe wavy nanosheets with clean surface were successfully prepared by solvothermal method:CO resolved from Fe（CO）₅ plays a crucial role in the formation of wavy nanosheets.The structural characteristics and growth process of Pd-Fe nanocrystals were studied in detail.During the growth,Pd-rich nanowires were first formed at the beginning of growth step,then Fe-rich nanosheets were formed spread around Pd-rich nanowires until the formation of wavy nanosheets.The as-prepared Pd-Fe nanosheets exhibited improved electrocatalytic performance in ethylene glycol oxidation reaction and glycerol oxidation reaction,meanwhile the Pd-Fe nanocrystals have high stability and resistance to CO poisoning.（3）A new type of carbon material,graphdiyne,was prepared by solution method.Graphdiyne-supported Pt-Cu nanowires were prepared by hydrothermal method with graphdiyne as carrier,and the catalytic performance for methanol oxidation reaction was investigated.Graphdiyne-supported Pd-Fe wavy nanosheets were prepared by solvothermal method.The morphology and structure of the catalyst were characterized by TEM and HRTEM,and the catalytic performance of the catalyst of ethylene glycol oxidation reaction was investigated.