The activity mechanism of anode catalysts on PEMFC
Date Issued
2007
Date
2007
Author(s)
Hsiao, Chen-Chih
DOI
zh-TW
Abstract
Rapid progress has been made in the development of proton exchange membrane fuel cell (PEMFC) technology over the past ten years. Proton exchange membrane fuel cell is a clean energy. After hydrogen oxidation and oxygen reduction, the final product is water. However, in order to achieve widespread commercial application of PEMFC in stationary and transportation markets, continued development is required. Within the fuel cell stack, key development areas are increase activity of catalyst and improve transition of membrane electrode assemblies (MEAs).in present reports, Platinum is the most popularly catalyst in PEMFC. Platinum is used due to its stability and because it enhances the hydrogen (H2) oxidation and oxygen (O2) reduction in an acid medium. The poor performance of pure platinum for methanol oxidation results from the strong adsorption pure platinum shown by CO on the metal. In order to overcome the blocking effect of CO on platinum, platinum has been alloyed with other metals.
Nafion® utilizes repeatedly hydrolysis and adsorption of SO3H to transmit the H proton. In past work, we had known when 30% the DPG with 70% Vulcan XC-72R powders could increase activity of catalyst, because the DPG containing few CNT (carbon nanotubes) and three dimension structure graphite could make the catalyst disperse well and the promotion of the electrochemical performance. In this work, we adding Ruthenium, Tin and palladium mixed with platinum to be bi- or tri-metallic Pt-M (Ru, Sn and Pd) catalyst. Use Pt–M adsorbed OH on the M sites facilitates oxidative removal of CO residues on platinum. In the result, we can promotion electrochemical activity and enhance stability of catalyst by cyclic voltammetry method.
Subjects
質子交換膜燃料電池
Nafion®
觸媒活性
奈米碳管
金屬觸媒
PEMFC
activity
CNT
metallic catalyst
Type
thesis
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