Liu Zhaolin, Lee Jim Yang, Chen Weixiang, Han Ming, Gan Leong Ming
Institute of Materials Research & Engineering, 3 Research Link, Singapore 117602, Department of Chemical and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore.
Langmuir. 2004 Jan 6;20(1):181-7. doi: 10.1021/la035204i.
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.
通过微波辅助多元醇法制备了负载在Vulcan XC - 72碳和碳纳米管上的PtRu纳米颗粒。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。均匀分散在碳上的PtRu纳米颗粒直径为2 - 6 nm。除2θ值略有偏移外，所有以此方法制备的PtRu/C催化剂均显示出Pt面心立方结构的特征衍射峰。XPS分析表明，催化剂主要含有Pt(0)和Ru(0)，以及痕量的Pt(II)、Pt(IV)和Ru(IV)。通过循环伏安法、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，两种PtRu/C催化剂对甲醇氧化均具有比对比Pt/C催化剂更高且更持久的电催化活性。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电池测试单元的初步数据显示出高功率密度。
