期刊
CRYSTENGCOMM
卷 16, 期 43, 页码 10066-10079出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ce41552j
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资金
- Atomic Energy Council [NSC 96-2623-7-007-022-NU, NSC 97-2623-7-007-006-NU]
- National Science Council
This study demonstrated that the methanol oxidation reaction (MOR) activity of carbon supported platinum-ruthenium catalysts (Pt-Ru/C) could be enhanced 2.6-fold with adequate oxidation treatment. Our results show that such enhancement is triggered by the hetero-junction of Pt atomic layers on a tetragonal phased RuO2 crystal. In a freshly prepared sample, the nanocatalysts (NCs) were built on a Ru rich core capped by a PtRu alloy shell. The thermal treatment restructures the Pt and Ru atoms to form an ordered heterojunction at the core-shell interface and optimize the activity of the NCs at a temperature of 520 K. The higher temperature oxidizes the Ru into a crystallite rutile RuO2 phase. In such cases the Pt atoms were segregated to form individual crystallites by a substantial lattice mismatch between the metallic Pt and RuO2 phases. This work presents a systematic analysis with theoretical modelling and quantitative characterization, manipulating the structural evolution and thus optimizing the MOR activity of Pt-Ru/C catalysts.
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