Solid Solution Alloy Nanoparticles of Immiscible Pd and Ru Elements Neighboring on Rh: Changeover of the Thermodynamic Behavior for Hydrogen Storage and Enhanced CO-Oxidizing Ability

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• 作者：Kohei Kusada ; Hirokazu Kobayashi ; Ryuichi Ikeda ; Yoshiki Kubota ; Masaki Takata ; Shoichi Toh ; Tomokazu Yamamoto ; Syo Matsumura ; Naoya Sumi ; Katsutoshi Sato ; Katsutoshi Nagaoka ; Hiroshi Kitagawa
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：February 5, 2014
• 年：2014
• 卷：136
• 期：5
• 页码：1864-1871
• 全文大小：577K
• ISSN：1520-5126

文摘

Pd_xRu_1鈥?i>x solid solution alloy nanoparticles were successfully synthesized over the whole composition range through a chemical reduction method, although Ru and Pd are immiscible at the atomic level in the bulk state. From the XRD measurement, it was found that the dominant structure of Pd_xRu_1鈥?i>x changes from fcc to hcp with increasing Ru content. The structures of Pd_xRu_1鈥?i>x nanoparticles in the Pd composition range of 30鈥?0% consisted of both solid solution fcc and hcp structures, and both phases coexist in a single particle. In addition, the reaction of hydrogen with the Pd_xRu_1鈥?i>x nanoparticles changed from exothermic to endothermic as the Ru content increased. Furthermore, the prepared Pd_xRu_1鈥?i>x nanoparticles demonstrated enhanced CO-oxidizing catalytic activity; Pd_0.5Ru_0.5 nanoparticles exhibit the highest catalytic activity. This activity is much higher than that of the practically used CO-oxidizing catalyst Ru and that of the neighboring Rh, between Ru and Pd.