A Caltech Library Service

Proton conductivity of acid-functionalized zeolite beta, MCM-41, and MCM-48 : effect of acid strength

McKeen, John C. and Yan, Yushan S. and Davis, Mark E. (2008) Proton conductivity of acid-functionalized zeolite beta, MCM-41, and MCM-48 : effect of acid strength. Chemistry of Materials, 20 (16). pp. 5122-5124. ISSN 0897-4756.

PDF - Supplemental Material
See Usage Policy.


Use this Persistent URL to link to this item:


Direct methanol fuel cells (DMFCs) and hydrogen proton exchange membrane fuel cells (PEMFCs) are two types of fuel cells where commercial products have been developed, but have yet to find widespread deployment. Although these devices are compact, easily refuelable, and operate at comparatively low temperatures, problems such as catalyst poisoning, methanol crossover, and water management exist and are current topics of research. One important component of both the DMFC and PEMFC is a protonically conducting but electronically insulating membrane placed between the anode and cathode. To minimize internal ohmic losses, the membrane must possess a high proton conductivity, and is commonly formed from Nafion or other perfluorosulfonic acid polymers. When fully hydrated, these polymers exhibit proton conductivites on the order of 1 × 10^(-1) to 1 × 10^(−2) S/cm. For hydrogen PEMFC without active humidification, proton conductivity decreases rapidly with increasing temperaure. For DMFC, membrane swelling allows methanol diffusion directly from anode to cathode decreasing cell efficiency.

Item Type:Article
Related URLs:
URLURL TypeDescription
Davis, Mark E.0000-0001-8294-1477
Additional Information:© 2008 American Chemical Society. Publication Date (Web): August 6, 2008. We acknowledge the U.S. Department of Energy (DE-FG02-05ER15716) and US National Science Foundation (CTS-0404376) for funding. J.C.M. acknowledges the John and Fannie Hertz Foundation and the NSF National Science Foundation Graduate Research Fellowship Program for financial support.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-05ER15716
Fannie and John Hertz FoundationUNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Issue or Number:16
Record Number:CaltechAUTHORS:20090428-083740090
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14096
Deposited By: Tony Diaz
Deposited On:07 Aug 2009 20:50
Last Modified:09 Mar 2020 13:18

Repository Staff Only: item control page