ID
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chemical Engineering MagazineChementator Briefs
H2SO4 Catalyst BASF SE (Ludwigshafen, Germany; www.basf.com) has introduced a…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEENVIRONMENTAL MANAGEREQUIPMENT & SERVICESFOCUS
12. Alfa_Laval_Valve_MatrixFocus on Valves
This butterfly valve has an inflatable seat for tight closure…
NEW PRODUCTS + Show More SHOW PREVIEWS

Comment Separation Processes

A fluorine-free membrane for fuel cells

By Tetsuo Satoh |

Polymer-electrolyte fuel cells (PEFCs) are promising devices for clean power generation in automotive, stationary and portable applications. Up to now, the proton exchange membranes (PEMs) used in PEFCs have been based on perfluorosulfonic acid (PFSA) ionomers (for example, Nafion). However, several problems have limited the widespread adoption of PEFCs, including high gas permeability, low thermal stability, high production cost and environmental incompatibility. It is believed that fluorine-free PEMs can potentially address all of these issues, but so far, no alternative membranes have simultaneously met the criteria for both high performance (for example, proton conductivity) and durability (for example, mechanical and chemical stability).

Now, researchers from the University of Yamanashi (Kofu City, www.yamanashi.ac.jp), with support from the New Energy and Industrial Technology Development Organization (NEDO; Kawasaki, www.nedo.go.jp), may have found a PEM with the desired properties. The membrane is a random copolymer (diagram) of sulfonated polyphenylene (SPP) and quinquephenyl (QP). The newly designed SPP-QP PEM exhibits very high proton conductivity, excellent flexibility and a low gas permeability (nearly 15–20% that of a Nafion-based system at 90% relative humidity). The new PEM is also said to be extremely stabile, with negligible degradation even under accelerated degradation conditions, which has never been achieved with existing fluorine-free PEMs. The SPP-QP PEM also exhibits reasonably high fuel-cell performance at open circuit voltage (OCV), with excellent durability under practical conditions after 1,000 h, which is longer than the 140 h typically observed with Nafion-based systems, says NEDO.

fluorine-free membrane

Related Content
Multilayer membrane for climate control
A triple-layer, porous membrane system developed at the Functional Materials Laboratory at Eidgenössische Technische Hochschule Zürich (www.fml.ethz.ch) can be fashioned…
A very efficient SOFC
Hitachi Zosen Corp. (HITZ, Osaka and Tokyo, Japan; www.hitachizosen.co.jp) has installed a solid-oxide fuel cell (SOFC) demonstration unit at Osaka…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Trinseo Digitizes Control System Migration Projects to Achieve Fast ROI
Purdue University Saves $400,000 Annually with Local Vacuum Networks
Bag filter Housings/Vessels
Innovative Backwashable Media Filter
Automated Vertical Tower Filter Press

View More

Live chat by BoldChat