Membranes for Polymer Electrolyte Fuel Cells

Membranes for Polymer Electrolyte Fuel Cells
헨켄스마이어디억Nambi Krishnan Nagappan장종현김형준
membrane; PEFC; fuel cell; mid/high temperature
Issue Date
추계총회 및 학술발표회 / Korean ELectrocehmical Society meeting
, 62-62
Polymer electrolyte fuel cells (PEFC) for automoblie application require an operation at elevated temperatures (> 120℃) and low humidification (< 50% rh). At those condition, electrode kinetics are enhanced, the catalyst is less sensitive towards carbon monoxide poisoning and water and thermal management can be simplified. However, the state-of-the-art membrane, Dupont's Nafion, has a glass temperature of about 110℃ and dries out rapidly at temperatures above 100℃. Therefore, the conventional membranes cannot be used in a high temperature PEFC. In order to facilitate high temperature / low humidification operadon, we develop silica filledpolysulfone membranes. A sulfonated polysulfone membrane (PES 60) with 60% of the repeat units bearing sulfonic acid groups was developed by us and presented before. Its tensile strength is nearly twice as high as that of Nafion, 43 MPa and 21 MPa, respectively. The fuel cell performance at 70℃ and 70% rh is very similar to that of Nafion. In order to increase the conductivity and to stabilize the polymer morphology at elevated temperatures, we synthesized a new membrane based on PES 70 which contains silica nano particles. The influence of the mixing process was investigated. The Tg of PES 70 is over 230 ℃. The tensile strength and Young modulus increase with the silica content, In the fuel cell, a minimum through-plane conductivity of 8 mS/cm and a minimum power density of 0.1 W/cm2 at 0.7 V were obtained at 120℃ and 50% rh.
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