Pt based nanocomposites (mono/bi/tri-metallic) decorated using different carbon supports for methanol electro-oxidation in acidic and basic media
作者： Baljit Singh , Lukaa Murad , Fathima Laffir , Calum Dickinson , Eithne Dempsey
DOI: 10.1039/C1NR10273G
关键词:
摘要: Pt based mono/bi/tri-metallic nanocomposites on different carbon supports (activated (AC), nanotubes (CNTs) and nanofibers (CNFs)) were synthesised surface enrichment achieved. The overall theoretical metallic content (Pt + Au Sn) was 20% (w/w) in all found to be uniformly distributed the supporting matrix (80%). morphology composition of materials characterised using scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDX), transmission (TEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA), diffraction (XRD) photoelectron (XPS), while cyclic voltammetry employed order confirm their typical electrochemical characteristics. Electrochemical measurements indicated that Pt2Au1Sn1 trimetallic catalysts demonstrated a significantly higher electrochemically active area relative activated supported PtAu bimetallic counterparts. results show CNT catalyst (Pt2Au1Sn1/CNT) showed greatest electroactive (49.3 m2/g) current density for methanol oxidation acidic (490 mA mg−1 Pt) as well basic (1700 conditions. Results comparison Au/C Sn/C (no/negligible response), presence small amount Sn nanocomposites, modified catalytic properties. (Pt1Au3/C) reasonably good response (260 among nanomaterials examined. achieved Pt2Au1Sn1/CNT 1.9 times (in media) 2.1 Pt/C terms per mg activity. Overall studies strongly capacity reduce precious required this application, demonstrating role improving current/potential signifying importance matrices.
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