Influence of Supporting Materials on Catalytic Activities of Gold Nanoparticles as CO-Tolerant Catalysts in DMFC
Influence of Supporting Materials on Catalytic Activities of Gold Nanoparticles as CO-Tolerant Catalysts in DMFC
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DOI：
10.5796/electrochemistry.75.217
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发表时间：
2007-02
期刊：
影响因子：
2.5
通讯作者：
K. Miyazaki;Y. Nishida;K. Matsuoka;Y. Iriyama;T. Abe;M. Matsuoka;K. Kikuchi;Z. Ogumi
中科院分区：
文献类型：
--
作者：
K. Miyazaki;Y. Nishida;K. Matsuoka;Y. Iriyama;T. Abe;M. Matsuoka;K. Kikuchi;Z. Ogumi
采用气相接枝法制备了Pt- sn /C和Pt/C负载的金纳米粒子（分别为纳米au /Pt- sn /C和纳米au /Pt/C），并通过稳态极化测量评价了它们对甲醇氧化的催化活性。x射线衍射测试表明，金纳米颗粒的直径约为4 nm， x射线光电子能谱分析表明，沉积在Pt- sn /C和Pt/C上的金纳米颗粒处于零氧化态。在1 M (M=mol dm−3)HClO4和1 M CH3OH水溶液中进行的电化学测试表明，在Pt-Sn/C催化剂中添加金纳米粒子比不添加金纳米粒子的Pt-Sn/C催化剂具有更高的甲醇氧化活性。相比之下，纳米au /Pt/C和Pt/C的催化活性几乎相同。结果表明，金纳米颗粒的催化活性受载体材料的影响。
Gold nanoparticles supported on Pt-Sn/C and Pt/C (nano-Au/Pt-Sn/C and nano-Au/Pt/C, respectively) were prepared by the gas-phase grafting method and their catalytic activities for methanol oxidation were evaluated by steady-state polarization measurement. X-ray diffraction measurement revealed that gold nanoparticles had a diameter of ca. 4 nm, and X-ray photoelectron spectroscopy revealed that gold nanoparticles deposited on Pt-Sn/C and Pt/C were in the zero-oxidation state. Electrochemical measurements performed in an aqueous solution of 1 M (M=mol dm−3) HClO4 and 1 M CH3OH demonstrated that the addition of gold nanoparticles to Pt-Sn/C catalyst gave higher catalytic activities for methanol oxidation than Pt-Sn/C catalyst without gold nanoparticles. In contrast, nano-Au/Pt/C and Pt/C showed almost identical catalytic activities. These results showed that the catalytic activities of gold nanoparticles were influenced by the supporting materials.