Facile and rapid synthesis of ultrafine PtPd bimetallic nanoparticles and their high performance toward methanol electrooxidation
Facile and rapid synthesis of ultrafine PtPd bimetallic nanoparticles and their high performance toward methanol electrooxidation
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DOI：
10.1155/2014/496249
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发表时间：
2014
影响因子：
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通讯作者：
Tiantian Xia;Han Shen;G. Chang;Yuting Zhang;Honghui Shu;M. Oyama;Yunbin He
中科院分区：
文献类型：
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作者：
Tiantian Xia;Han Shen;G. Chang;Yuting Zhang;Honghui Shu;M. Oyama;Yunbin He
在室温下，不使用任何表面活性剂，通过简单易行的方法合成了均匀且小于10 nm尺寸的双金属PtPd纳米颗粒（NPs）。抗坏血酸（AA）作为一种绿色、清洁的还原剂，用于水溶液中K2PtCl4和K2PdCl4的共还原。采用透射电子显微镜（TEM）、场发射高分辨率透射电子显微镜（FE-HRTEM）、能谱（EDS）、x射线衍射（XRD）和x射线光电子能谱（XPS）对PtPd NPs的形貌、组成和结构进行了表征。与单金属Pt和Pd相比，所制备的纳米合金具有更强的电催化活性和对甲醇电氧化过程中中间体中毒的耐受性，是一种很有前途的直接甲醇燃料电池（dmfc）电催化剂。同时，这种绿色简单的方法可以很容易地推广到双金属或三金属合金纳米材料的制造中。
Uniform and sub-10 nm size bimetallic PtPd nanoparticles (NPs) have been synthesized via a simple and facile method without using any surfactants at an ambient temperature. As a green and clean reductive agent, ascorbic acid (AA) was employed for the coreduction of K2PtCl4 and K2PdCl4 in aqueous solution. The morphology, composition, and structure of PtPd NPs had been characterized by transmission electron microscopy (TEM), field emission high resolution transmission electron microscopy (FE-HRTEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscope (XPS). Comparing with both the monometallic Pt and Pd, the as-prepared alloy nanoparticles show superior electrocatalytic activity and better tolerance against poisoning by intermediates generated during methanol electrooxidation, which makes them a promising electrocatalysts for direct methanol fuel cells (DMFCs). Meanwhile, the green and simple approach could be easily extended to the manufacture of bimetallic or trimetallic alloy nanomaterials.