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Synthesis and Characterization of Catalysts for Proton Exchange Membrane Fuel Cell

Author: LiXingWang
Tutor: ZhuHong
School: Beijing University of Chemical Technology
Course: Chemistry
Keywords: Proton exchange membrane fuel cell Electro-catalyst Oxygen Reduction Core-shell
CLC: TM911.4
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 0
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Abstract


Proton exchange membrane fuel cell (PEMFC) due to its high energy density , high energy conversion rate , low pollution, environmentally friendly outstanding merits has broad application prospects, but the currently used platinum catalyst due to its high price , lack of resources and limited life and other factors limit the development of PEMFC . This thesis were synthesized Pd-Pt / C alloy catalyst , TiO2 nanoparticles doped with Pt / C catalysts and nano- core-shell Cu @ Pt / C catalyst , designed to improve the utilization of Pt catalyst , reducing catalyst costs. ( 1 ) synthesized by chemical reduction Pd-Pt / C catalyst alloy crystal integrity , wherein the Pd-Pt alloy particles diameter ratio Pt / C catalyst of Pt particle size slightly . By cyclic voltammetry and rotating disk electrode tests show , Pd-Pt / C catalyst for electro-catalytic activity of Pt / C catalyst equivalent, but significantly improve the utilization of Pt . ( 2 ) use of hydrothermal TiO2 Nanoparticles crystal integrity , with an average particle size of about 7.99nm. By cyclic voltammetry and rotating disk electrode tests show that doped TiO2 nanoparticles Pt / C catalyst in TiO2 content of 10%, the best electrochemical stability , electrical activity of the catalyst is also high. ( 3 ) Preparation of a two-step reduction of Cu @ Pt / C catalysts were characterized by XRD and TEM analysis showed that it is a core-shell structure , wherein the metal particle size of about 5-6nm, shell thickness of 1-2 nm. By cyclic voltammetry and cathodic polarization curves showed that : the core-shell type catalyst Cu @ Pt / C electro-catalytic activity than the same platinum loading of Pt / C catalysts are significantly enhanced , when the metal loading of 20% copper 2.73:1 molar ratio of platinum is a core-shell Cu @ Pt / C catalyst maximum electrochemical activity of Pt . When the catalyst metal loading increased to 40 %, the core-shell structure can be formed of copper catalyst, the best feed ratio ( molar ratio) of 1.5:1.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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