Structures and Catalytic Properties of PtRu Electrocatalysts Prepared via the Reduced RuO2 Nanorods Array
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- 作者：Shih-Hui Huang ; Diah Susanti ; Dah-Shyang Tsai ; Yu-Chi Hsieh ; Ying-Sheng Huang ; Wen-Hung Chung
- 刊名：Langmuir
- 出版年：2008
- 出版时间：March 18, 2008
- 年：2008
- 卷：24
- 期：6
- 页码：2785 - 2791
- 全文大小：443K
- 年卷期：v.24,no.6(March 18, 2008)
- ISSN：1520-5827
文摘
Structures and properties of PtRu electrocatalyts, derived from the aligned RuO2 nanorods (RuO2NR), are investigatedusing scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectronspectroscopy, and cyclic voltammetry toward COads and methanol oxidation. The catalytic activity of methanol oxidationand the CO tolerance are promoted significantly by reducing RuO2 into Ru metal before decorating with Pt. Reductionof RuO2NR was carried out by either thermal decomposition at 650 
C in vacuum or H2-reduction at 130 C inlow-pressure hydrogen. Reduction assisted by hydrogen allows infiltrating decomposition at low temperature andproduces an array of nanorods with rugged walls featuring small Ru nuclei and larger surface area. Pt-RuNR, whosesurface Pt:Ru ratio = 0.58:0.42 was prepared by decorating with 0.1 mg cm-2 Pt on the H2-reduced array containing0.39 mg cm-2 Ru, demonstrates a favorable combination of CO tolerance and high methanol oxidation activity superiorto other RuO2NR-derived catalysts. When compared with a commercial electrocatalyst of PtRu (1:1) alloy (<4 nm),the activity of Pt-RuNR in methanol oxidation is shown to be somewhat lower at potential <0.48 V and higher atpotential 
0.48 V.
C in vacuum or H2-reduction at 130 C inlow-pressure hydrogen. Reduction assisted by hydrogen allows infiltrating decomposition at low temperature andproduces an array of nanorods with rugged walls featuring small Ru nuclei and larger surface area. Pt-RuNR, whosesurface Pt:Ru ratio = 0.58:0.42 was prepared by decorating with 0.1 mg cm-2 Pt on the H2-reduced array containing0.39 mg cm-2 Ru, demonstrates a favorable combination of CO tolerance and high methanol oxidation activity superiorto other RuO2NR-derived catalysts. When compared with a commercial electrocatalyst of PtRu (1:1) alloy (<4 nm),the activity of Pt-RuNR in methanol oxidation is shown to be somewhat lower at potential <0.48 V and higher atpotential 0.48 V.