SYNTHESIS AND CHARACTERIZATION OF PT-BASED FUEL CELL CATALYSTS

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" SYNTHESIS AND CHARACTERIZATION OF PT-BASED FUEL CELL CATALYSTS "

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	150464
Doc. No	:	ET22256
Main Entry	:	HEE SO0 KIM
Title Proper	:	SYNTHESIS AND CHARACTERIZATION OF PT-BASED FUEL CELL CATALYSTS
Note	:	This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract	:	Highly active Pt-based nanoparticle fuel cell catalysts were synthesized by spontaneousdeposition method and explored by electrochemistry and electrochemical NMR(EC-NMR).PtIRu catalysts were obtained by spontaneous deposition of Ru onto platinum nanoparticles.Their reactivity toward methanol oxidation maximized at ruthenium packing density 0.4-0.5,displaying twice the activity of the commercial Pt-Ru alloy catalyst. CO molecules adsorbed onthese PtIRu nanoparticle consisted of two domains: CO on remote Pt domains behaved like COon pure Pt while CO on or near Ru islands had highly shifted 13c NMR resonances, weakerKorringa relaxation, and thermal diffusion at higher temperatures. The change in CO 2?c* Fermilevel local density of states (ErLDOS) suggested that the addition of Ru weakened Pt-CO bond.The Ru spontaneous deposition was further applied to carbon-supported Pt nanoparticles of 2.0to 8.8 nm size. Their reactivity increased with increasing particle size and the optimum Rupacking density was 0.2-0.4 depending on the particle size.-...,..tested for theQ1 PC1 bus cardBoth these projects mere sofixare des elopment efforts tonards contributing to dlfferentaspects of Roboucs and lZ1echatronics projects m the Controls and Roboucs Group..
Subject	:	Electericl tess
	:	برق
electronic file name	:	TL45461.pdf
Title and statement of responsibility and	:	SYNTHESIS AND CHARACTERIZATION OF PT-BASED FUEL CELL CATALYSTS [Thesis]