Fabrication and Characterization of Well-Dispersed and Highly Stable PtRu Nanoparticles on Carbon Mesoporous Material for Applications in Direct Methanol Fuel Cell
2008; American Chemical Society; Volume: 20; Issue: 4 Linguagem: Inglês
10.1021/cm702777j
ISSN1520-5002
AutoresShou‐Heng Liu, Wen‐Yueh Yu, Ching-Hsiang Chen, An-Ya Lo, Bing‐Joe Hwang, Shu-Hua Chien, Shang-Bin Liu,
Tópico(s)Fuel Cells and Related Materials
ResumoWell-dispersed, highly stable PtRu nanoparticles of ca. 2–3 nm on carbon mesoporous materials (PtRu-CMMs) were synthesized directly using SBA-15 mesoporous silica as the template, furfuryl alcohol and trimethylbenzene as the primary carbon source, and platinum and ruthenium acetylacetonates as the cofeeding metal and carbon precursors. Results obtained from X-ray diffraction and X-ray photoelectron spectroscopy show that the Pt metal in the PtRu-CMMs was present in the form of a face-centered cubic (fcc) crystalline structure and the alloyed PtRu nanoparticles were composed mainly of Ru oxides, Ru(0), and Pt(0) metals. Further studies by X-ray absorption spectroscopy confirmed that a highly alloyed state of the PtRu nanoparticles is responsible for the superior electrocatalytic performance observed for the PtRu-CMMs, as compared to typical commercial electrocatalysts. The Pt50Ru50-CMM sample was found to possess the best electrocatalytic performance and long-term durability and should appeal to direct methanol fuel cell applications as anodic electrodecatalyst.
Referência(s)