TY - GEN
T1 - Water sorption and transport in Nafion membranes
AU - Majsztrik, Paul W.
AU - Satterfield, M. Barclay
AU - Bocarsly, Andrew Bruce
AU - Benziger, Jay Burton
PY - 2007
Y1 - 2007
N2 - Water sorption, desorption, and permeation in and through Nafion membranes 51-606 pm thick were measured as functions of temperature between 30 and 90°C. Water permeation rates are weakly dependent on membrane thickness. Water permeation from liquid water was faster than water permeation from 100% relative humidity gas. These results indicated that interfacial mass transport at the membrane/gas interface was the limiting resistance to transport and not diffusion. Water sorption is initially limited by interfacial mass transport; above a critical water content water sorption is limited by polymer relaxation dynamics associated with swelling. Water desorption from a water saturated film was an order of magnitude faster than water sorption. Different regimes of water transport and sorption in Nafion membranes corresponding to diffusion, interfacial transport and polymer swelling depend on membrane thickness, temperature and the contacting phase.
AB - Water sorption, desorption, and permeation in and through Nafion membranes 51-606 pm thick were measured as functions of temperature between 30 and 90°C. Water permeation rates are weakly dependent on membrane thickness. Water permeation from liquid water was faster than water permeation from 100% relative humidity gas. These results indicated that interfacial mass transport at the membrane/gas interface was the limiting resistance to transport and not diffusion. Water sorption is initially limited by interfacial mass transport; above a critical water content water sorption is limited by polymer relaxation dynamics associated with swelling. Water desorption from a water saturated film was an order of magnitude faster than water sorption. Different regimes of water transport and sorption in Nafion membranes corresponding to diffusion, interfacial transport and polymer swelling depend on membrane thickness, temperature and the contacting phase.
UR - http://www.scopus.com/inward/record.url?scp=45249102886&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=45249102886&partnerID=8YFLogxK
U2 - 10.1149/1.2780974
DO - 10.1149/1.2780974
M3 - Conference contribution
AN - SCOPUS:45249102886
SN - 9781566775816
SN - 9781566775670
T3 - ECS Transactions
SP - 609
EP - 621
BT - ECS Transactions - 7th Symposium Devoted to Proton Exchange Membrane Fuel Cells
T2 - 7th Symposium Devoted to Proton Exchange Membrane Fuel Cells - 212th ECS Meeting
Y2 - 7 October 2007 through 12 October 2007
ER -