EFFECT OF NAFION IONOMER AND CATALYST IN CATHODE LAYERS FOR THE DIRECT FORMIC ACID FUEL CELL WITH COMPLEX CAPACITANCE ANALYSIS ON THE IONIC RESISTANCE

Title
EFFECT OF NAFION IONOMER AND CATALYST IN CATHODE LAYERS FOR THE DIRECT FORMIC ACID FUEL CELL WITH COMPLEX CAPACITANCE ANALYSIS ON THE IONIC RESISTANCE
Authors
장종현김선형한종희권용재이병석김형준조은애김수길헨켄스마이어디억남석우임태훈
Issue Date
2011-12
Publisher
Proceedings of EFC2011 European Fuel Cell - Piero Lunghi Conference & Exhibition
Citation
, 1-2
Abstract
Using platinum (Pt) black and carbon-supported Pt (Pt/C) as cathode catalysts, membrane-electrode assemblies (MEAs) were fabricated with various Nafion ionomer content, and their direct formic acid fuel cell (DFAFC) performances were investigated. In MEAs incorporating Pt black catalysts, the current density at 0.6 V was highest at ionomer/catalyst volume ratio of 1.0, but the current density at 0.3 V gradually increased with Nafion ionomer content, especially at low ionomer loading. This suggests that the key parameter for DFAFC performance is the electrochemical active area (EAS) for 0.6 V and proton transport for 0.3 V. In this study, the complex capacitance analysis of impedance data implemented with nitrogen (cathodes)/hydrogen (anodes) atmosphere was utilized to measure the ionic resistance (Rion) of cathode layers with various Nafion ionomer contents. For Pt/C, the layer thickness and EAS of cathode were larger than those of MEA cathode using Pt black; and the current densities at 0.6 V were lower than those of Pt black, suggesting that Pt utilization is much lower.
URI
http://pubs.kist.re.kr/handle/201004/41999
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KIST Publication > Conference Paper
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