Constructing Hierarchical Interfaces: TiO2-Supported PtFe鈥揊eOx Nanowires for Room Temperature CO Oxidation

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• 作者：Huiyuan Zhu ; Zili Wu ; Dong Su ; Gabriel M. Veith ; Hanfeng Lu ; Pengfei Zhang ; Song-Hai Chai ; Sheng Dai
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：137
• 期：32
• 页码：10156-10159
• 全文大小：342K
• ISSN：1520-5126

文摘

In this communication, we report a facile approach to constructing catalytic active hierarchical interfaces in one-dimensional (1D) nanostructure, exemplified by the synthesis of TiO₂-supported PtFe鈥揊eO_x nanowires (NWs). The hierarchical interface, constituting atomic level interactions between PtFe and FeO_x within each NW and the interactions between NWs and support (TiO₂), enables CO oxidation with 100% conversion at room temperature. We identify the role of the two interfaces by probing the CO oxidation reaction with isotopic labeling experiments. Both the oxygen atoms (Os) in FeO_x and TiO₂ participate in the initial CO oxidation, facilitating the reaction through a redox pathway. Moreover, the intact 1D structure leads to the high stability of the catalyst. After 30 h in the reaction stream, the PtFe鈥揊eO_x/TiO₂ catalyst exhibits no activity decay. Our results provide a general approach and new insights into the construction of hierarchical interfaces for advanced catalysis.