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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25594

Title: Dealloying and Synthesis of Nanoporous Pt and Au from AgPt and AgAu Binary Alloys
Authors: Ganti Mahapatruni, Aditya
Advisor: Newman, Roger C.
Department: Chemical Engineering and Applied Chemistry
Keywords: Dealloying
Nanoporous
AgAu
AgPt
Critical potential
Issue Date: 31-Dec-2010
Abstract: A study is presented on the synthesis and characterization of nanoporous AgPt and AgAu alloys after annealing and dealloying in 5% HClO4. Dealloying removes the less-noble atom from the alloy surface to produce nanoporous, highly-interconnected ligaments. Voltammetry of AgPt and AgAu shows the critical potential, Ec, at various potential scan rates. Potential hold current decay experiments on Ag-23Pt and Ag-23Au further show the intrinsic Ec to be 275 mV and 290 mV, respectively. Ec was governed by thermodynamic clustering in the alloys as opposed to dissolution-diffusion kinetic effects. EDX shows the starting 77Ag-23Pt material changes composition after dealloying to about 12Ag-88Pt. XRD indicates the presence of ordering in AgPt via a superlattice (100)-peak for a specific anneal treatment. EIS measurements done on as-annealed and dealloyed AgPt and AgAu samples show the onset of bulk porosity and show that capacitance increase is equal for both alloys at two different dealloying potentials.
URI: http://hdl.handle.net/1807/25594
Appears in Collections:Master
Department of Chemical Engineering and Applied Chemistry - Master theses

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