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http://dx.doi.org/10.5229/JKES.2021.24.4.106

Electrochemical Characteristics of Electrode by Various Preparation Methods for Alkaline Membrane Fuel Cell  

Yuk, Eunsung (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER))
Lee, Hyejin (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER))
Jung, Namgee (Graduate School of Energy Science and Technology (GEST), Chungnam National Unuversity)
Shin, Dongwon (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER))
Bae, Byungchan (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER))
Publication Information
Journal of the Korean Electrochemical Society / v.24, no.4, 2021 , pp. 106-112 More about this Journal
Abstract
Catalyst poisoning by ionomers in membrane electrode assemblies of alkaline membrane fuel cells has been reported recently. We tried to improve the membrane electrode assembly's performance by controlling the solvent's ratio during electrode manufacturing. 4 Different mixing ratios of N-Methyl-2-pyrrolidone (NMP) and ethylene glycol (EG) gave four different cathode electrodes with platinum and Fuma-Tech ionomers. The electrode with higher EG improved polarization performance by about 36% compared to the NMP-based commercial ionomer. The dependence of the ionomer's dispersibility on the solvent seems responsible for the difference, which means that the non-uniform distribution of ionomers improves the performance of the electrode. High-frequency resistance, internal resistance corrected polarization curve, Tafel slope, mass activity, and impedance spectroscopy characterized the electrode. We can find that the existence of poor solvent improves cathode electrode performance. It seems to be the result of reduced poisoning of the catalyst according to the particle size distribution of the ionomer.
Keywords
Ionomer agglomeration; Ionomer Adsorption; Cathode Poisoning; Alkaline membrane fuel cell; Membrane electrode assembly;
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