Physical and electrochemical characterizations of microwave-assisted polyol preparation of carbon-supported PtRu nanoparticles
Physical and electrochemical characterizations of microwave-assisted polyol preparation of carbon-supported PtRu nanoparticles
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DOI：
10.1021/la035204i
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发表时间：
2004-01-06
期刊：
影响因子：
3.9
通讯作者：
Gan, LM
中科院分区：
文献类型：
--
作者：
Liu, ZL;Lee, JY;Gan, LM
采用微波辅助多元醇法制备了负载于Vulcan XC-72碳和碳纳米管上的PtRu纳米粒子。采用透射电子显微镜、X射线衍射和X射线光电子能谱（XPS）对催化剂进行了表征。PtRu纳米颗粒均匀分散在碳上，直径为2-6 nm。如此制备的所有PtRu/C催化剂显示Pt面心立方结构的特征衍射峰，除了2 θ值偏移到稍高的值。XPS分析显示，催化剂主要含有Pt（0）和Ru（0），以及痕量的Pt（II）、Pt（IV）和Ru（IV）。用循环伏安法、线性扫描伏安法和计时电流法研究了甲醇的电氧化。结果发现，这两个PtRu/C催化剂具有较高的和更持久的电催化活性，甲醇氧化比比较Pt/C催化剂。使用Vulcan碳负载的PtRu合金作为阳极催化剂的直接甲醇燃料电池单堆测试电池的初步数据显示出高功率密度。
PtRu nanoparticles supported on Vulcan XC-72 carbon and carbon nanotubes were prepared by a microwave-assisted polyol process. The catalysts were characterized by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). The PtRu nanoparticles, which were uniformly dispersed on carbon, were 2-6 nm in diameter. All PtRu/C catalysts prepared as such displayed the characteristic diffraction peaks of a Pt face-centered cubic structure, excepting that the 2theta values were shifted to slightly higher values. XPS analysis revealed that the catalysts contained mostly Pt(0) and Ru(0), with traces of Pt(II), Pt(IV), and Ru(IV). The electro-oxidation of methanol was studied by cyclic voltammetry, linear sweep voltammetry, and chronoamperometry. It was found that both PtRu/C catalysts had high and more durable electrocatalytic activities for methanol oxidation than a comparative Pt/C catalyst. Preliminary data from a direct methanol fuel cell single stack test cell using the Vulcan-carbon-supported PtRu alloy as the anode catalyst showed high power density.