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首页> 外文会议>Electrochemical Society(ECS) Meeting;Symposium on Electrochemistry of Novel Electrode Materials for Energy Conversion and Storage; 20070506-11;20070506-11; Chicago,IL(US);Chicago,IL(US) >Structural Investigation of Carbon Supported Ru-Se Based Catalysts using Anomalous Small Angle X-Ray Scattering
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Structural Investigation of Carbon Supported Ru-Se Based Catalysts using Anomalous Small Angle X-Ray Scattering

机译：碳载Ru-Se基催化剂的反常小角X射线散射结构研究

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摘要

Selenium modified ruthenium nano-particles are of interest as methanol tolerant electro-catalysts replacing the rare and expensive platinum at the cathode side of low-temperature Direct Methanol Fuel Cells. Recently, it has been found that both the activity and the oxidation resistance of ruthenium can be improved significantly by selenium. The structure and chemical composition of that RuSe_xO_y electro-catalyst were analyzed by Anomalous Small Angle X-ray Scattering (ASAXS). ASAXS represents a powerful tool that yields not only averaged structural parameters, but also useful data on the chemical composition on the sub-nanometer scale. Comprehensive ASAXS measurements using X-ray energies near below the Se-K- and Ru-K- absorption edges have been performed in addition to XRD, EXAFS, XPS and TEM studies of these catalysts. The results obtained allowed to deduce a structural model. A cluster like distribution of sub-nanometer sized selenium on the surface of carbon black supported ruthenium nano-particles has been proven.
机译：硒改性的钌纳米粒子作为耐甲醇的电催化剂受到关注，它代替了低温直接甲醇燃料电池阴极侧的稀有且昂贵的铂。最近，已经发现，硒可以显着提高钌的活性和抗氧化性。通过反常小角X射线散射（ASAXS）分析了RuSe_xO_y电催化剂的结构和化学组成。 ASAXS代表了一个强大的工具，它不仅可以得出平均的结构参数，而且还可以提供有关亚纳米级化学成分的有用数据。除了对这些催化剂进行XRD，EXAFS，XPS和TEM研究外，还使用X-射线能量接近Se-K-和Ru-K-吸收边缘的方式对ASAXS进行了全面的测量。获得的结果可以推断出结构模型。已证明在炭黑负载的钌纳米粒子表面上存在亚纳米级硒的簇状分布。

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