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Sandra Schaefer,Falk Muench,Eric Mankel,Anne Fuchs,Joachim Br€otz,Ulrike Kunz,Wolfgang Ensinger 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.6
The synthesis of bimetallic nanostructures using galvanic replacement displays a versatile route toward efficient catalysts for fuel cell reactions. We show that electrolessly plated Ag nanotubes (NTs) are a unique template for the synthesis of double-walled Ag – Pt NTs. After replacement reaction, different dealloying protocols are applied to adjust the residual Ag content. The structures were thoroughly characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, providing evidence of a hollow tube structure composed of Ag – Pt alloy. Experiments under harsh conditions reveal, that a significant amount of Ag remain in the NTs, which strongly affects the methanol oxidation performance. With optimized Ag – Pt ratio, the specific activity of Pt/C catalysts can be out-performed. From the obtained results, we emphasize that each effort using galvanic replacement should be accompanied by detailed compositional analysis.