TY - GEN
T1 - Influence of ionorier content on the structure and performance of PEFC membrane electrode assemblies
AU - Xie, Jian
AU - Wood, David L.
AU - More, Karren L.
AU - Zawodzinski, Thomas A.
AU - Smith, Wayne H.
PY - 2004
Y1 - 2004
N2 - Varying Nafion® content in the cathode catalyst layer of PEFC was shown to have an effect on performance over the entire polarization range, as well as on electrode structure. AFM and TEM were used to demonstrate the effect of Nafion® content on the dispersion of carbon aggregates. Further TEM analysis showed the distribution and thickness of the ionomer film surrounding the catalyst particles and carbon aggregates. These observed MEA structural variations correlated well with individual MEA performance in both the kinetic and mass-transport regions. The primary factors determining MEA performance were found to be the extent of the ionomer/catalyst-particle interfacial zone, the dispersion of carbon-support aggregates, and the distribution and thickness of the ionomer film surrounding the catalyst particles/carbon aggregates. The optimized cathode Nafion® content for the decal preparation method was shown to be 27±6 wt% for an E-TEK 20% Pt 3Cr/C catalyst at a loading of 0.20 mg Pt/cm 2.
AB - Varying Nafion® content in the cathode catalyst layer of PEFC was shown to have an effect on performance over the entire polarization range, as well as on electrode structure. AFM and TEM were used to demonstrate the effect of Nafion® content on the dispersion of carbon aggregates. Further TEM analysis showed the distribution and thickness of the ionomer film surrounding the catalyst particles and carbon aggregates. These observed MEA structural variations correlated well with individual MEA performance in both the kinetic and mass-transport regions. The primary factors determining MEA performance were found to be the extent of the ionomer/catalyst-particle interfacial zone, the dispersion of carbon-support aggregates, and the distribution and thickness of the ionomer film surrounding the catalyst particles/carbon aggregates. The optimized cathode Nafion® content for the decal preparation method was shown to be 27±6 wt% for an E-TEK 20% Pt 3Cr/C catalyst at a loading of 0.20 mg Pt/cm 2.
UR - http://www.scopus.com/inward/record.url?scp=33751285177&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33751285177
SN - 1566774349
SN - 9781566774345
T3 - Proceedings - Electrochemical Society
SP - 657
EP - 671
BT - Proton Conducting Membrane Fuel Cells IV - Proceedings of the International Symposium
T2 - 206th Meeting of The Electrochemical Society Fall 2004
Y2 - 3 October 2006 through 8 October 2006
ER -