Influence of hot-pressing temperature on the performance of PEMFC and catalytic activity

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Title:	Influence of hot-pressing temperature on the performance of PEMFC and catalytic activity
Authors:	Lin,JC;Lai,CM;Ting,FP;Chyou,SD;Hsueh,KL
Contributors:	化學工程與材料工程學系
Keywords:	MEMBRANE FUEL-CELLS;EMPIRICAL-EQUATION;ELECTRODES;IMPEDANCE;TRANSPORTATION;TECHNOLOGY;BEHAVIOR;PLATES
Date:	2009
Issue Date:	2010-06-29 17:27:15 (UTC+8)
Publisher:	中央大學
Abstract:	The influence of hot-pressing temperature on catalytic activity and the performance of proton exchange membrane fuel cells (PEMFCs) was investigated using current-voltage (I-V) polarization, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). EIS provided detailed information on the contribution, from high to low frequencies, of internal impedance (R-s), interfacial impedance (R-if) and reaction impedance (R-rxn). The ohmic resistance of the cell (R-Omega) was estimated from the I-V diagram for comparison with the R-s and R-if impedances. The Rif is useful for diagnosing catalytic activity and interpreting PEMFC performance. A cell was hot-pressed at 125 degrees C (near the transition temperature of Nafion), an optimum temperature for lowest ohmic resistance and total impedance in response to a maximal catalyst-specific activity.
Relation:	JOURNAL OF APPLIED ELECTROCHEMISTRY
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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