Structural Evolution of Plasma-Sputtered Core鈥揝hell Nanoparticles for Catalytic Combustion of Methane
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- 作者：Xiaoning Guo ; Pascal Brault ; Guojuan Zhi ; Ama毛l Caillard ; Guoqiang Jin ; Xiangyun Guo
- 刊名：Journal of Physical Chemistry C
- 出版年：2011
- 出版时间：December 15, 2011
- 年：2011
- 卷：115
- 期：49
- 页码：24164-24171
- 全文大小：1222K
- 年卷期：v.115,no.49(December 15, 2011)
- ISSN：1932-7455
文摘
Fe@Pd, Fe@Pt, and Fe@Au core鈥搒hell nanoparticles supported by silicon carbide have been prepared by plasma sputtering deposition and employed as the catalyst for methane combustion. The core鈥搒hell catalysts exhibit higher activities than single metallic catalysts due to surface alloying effects. With the surface alloying of the core鈥搒hell nanoparticles, Pd鈥揙 and Pt鈥揙 bonds become weak because the increase of the electron cloud density around Pd and Pt atoms due to the electron transfer from surface Fe to Pd or Pt atoms. Therefore, the activities of Fe@Pd/SiC and Fe@Pt/SiC increase with the reaction time. The activity of Fe@Au/SiC keeps invariant in the reaction because the Fe@Au core鈥搒hell structure has high stability. Transmission electron microscopy and X-ray photoelectron spectroscopy results further confirm the structural evolution.