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http://dx.doi.org/10.9713/kcer.2018.56.1.1

Effect of Current Density on Ion Conductivity of Membrane in Proton Exchange Membrane  

Hwang, Byungchan (Department of Chemical Engineering, Sunchon National University)
Oh, Sohyung (Department of Chemical Engineering, Sunchon National University)
Lee, Daewoong (Department of Chemical Engineering, Sunchon National University)
Chung, Hoi-Bum (Department of Mechanical Engineering, Sunchon National University)
You, Seung-Eul (KATECH)
Ku, Young-Mo (KATECH)
Na, Il-Chae (CNL Energy Co.)
Lee, Jung-Hoon (CNL Energy Co.)
Park, Kwonpil (Department of Chemical Engineering, Sunchon National University)
Publication Information
Korean Chemical Engineering Research / v.56, no.1, 2018 , pp. 1-5 More about this Journal
Abstract
In this work, we study the ion conductivity by analyzing the impedance to the high current density range that the PEMFC (Proton Exchange Membrane Fuel Cell) is actually operated. The effect of GDL (Gas Diffusion Layer)presence on impedance was investigated indirectly by measuring hydrogen permeability. When the RH (Relative Humidity)was higher than 60% in the low current range (< $80mA/cm^2$), the moisture content of the polymer membrane was sufficient and the ion conductivity of the membrane was not influenced by the current change. However, when RH was low, ion conductivity increased due to water production as current density increased. The ion conductivity of the membrane obtained by HFR (High Frequency Resistance) in the high current region ($100{\sim}800mA/cm^2$)was compared with the measured value and simulated value. At RH 100%, both experimental and simulated values showed constant ion conductivity without being influenced by current change. At 30~70% of RH, the ionic conductivity increased with increasing current density and tended to be constant.
Keywords
PEMFC; Membrane; Ion conductivity; Relative Humidity; Current Density; Simulation;
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Times Cited By KSCI : 1  (Citation Analysis)
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