凹形树突状PtCu纳米催化剂的合成及对甲醇的电催化

Facile Synthesis of Concave Dendritic PtCu Nanoparticles with Enhanced Methanol Electro-oxidation Activities

以邻苯二胺为表面活性剂,通过水热釜法一步制备凹形树突状PtCu双金属纳米催化剂(PtCu NCDs)。PtCu NCDs在电催化甲醇氧化(MOR)的应用中表现出非常高的活性和很强的抗有毒中间体作用。PtCu NCDs对于甲醇氧化的质量活性为(0.53 A·mg^(-2)Pt)是商业Pt/C(0.26 A·mg^(-1) Pt)的2.04倍。从比活性的CV曲线图对比发现PtCu NCDs(1.07 m A·cm^(-2))是商业Pt/C(0.55 m A·cm^(-2))的1.95倍。而且,PtCu NCDs(2.76)比商业Pt/C催化剂(1.02)表现出更高的If/Ib比值。这些优异的电催化活性可能归功于PtCu NCDs特殊的凹形树突状形貌。

Concave dendritic PtCu bimetallic nanocatalysts（PtCu NCDs） was prepared by one-step method in a Teflon-lined stainless steel autoclave with o-phenylenediamine as surface active agent. In the reaction system, ophenylenediamine plays an important role in initiating, promoting and guiding replacement reaction. The PtCu NCDs exhibited exceptionally high activity and strong poisoning resistance in methanol oxidation reaction（MOR）.The mass activity of PtCu NCDs（0.53 A·mg^（-1）Pt） was 2.04 times higher than that of the commercial Pt/C catalysts（0.26 A·mg^（-1）Pt） in MOR. The specific activity of PtCu NCDs（1.07 m A·cm^（-2）） was 1.95 times higher than that of the commercial Pt/C catalysts（0.55 m A·cm^（-2））. Moreover, PtCu NCDs（2.76） showed a higher ratio of If/ Ibthan the commercial Pt/C catalysts（1.02）. The enhanced catalytic activity could be owed to the unique concave dendritic morphology of the bimetallic nanoparticles.