Oxidation and reduction processes of platinum nanoparticles observed at the atomic scale by environmental transmission electron microscopy
Oxidation and reduction processes of platinum nanoparticles observed at the atomic scale by environmental transmission electron microscopy
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DOI：
10.1039/c4nr04352a
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发表时间：
2014-01-01
期刊：
影响因子：
6.7
通讯作者：
Takeda, Seiji
中科院分区：
文献类型：
--
作者：
Yoshida, Hideto;Omote, Hiroki;Takeda, Seiji
氧化和还原的Pt纳米粒子的表面原位研究在反应性气体（O-2，CO和H2O蒸汽）的像差校正的环境透射电子显微镜。在室温下，在O-2气氛中，Pt纳米颗粒表面逐渐形成Pt氧化物原子层。表面的Pt氧化物在真空和包括CO的气体中迅速还原为Pt。我们发现，H2O蒸气抑制表面氧化。在这项研究中发现的过程是由气体引起的，这些气体很可能是由电子辐射激活的。观察结果提供了原子洞察的氧化和还原过程中的Pt纳米粒子的表面暴露于活化气体。
Oxidation and reduction of the surfaces of Pt nanoparticles were in situ examined in reactive gases (O-2, CO and H2O vapor) by aberration-corrected environmental transmission electron microscopy. Atomic layers of Pt oxides were gradually formed on the surface of Pt nanoparticles at room temperature in O-2. The surface Pt oxides were reduced to Pt promptly in both vacuum and gas including CO. We showed that H2O vapor suppressed the surface oxidation. The processes found in this study were induced by gases that were most likely activated by electron irradiation. The observation results provide atomistic insight into the oxidation and reduction process of the surface of Pt nanoparticles that is exposed to activated gases.