Cy H. Fujimoto

Transport Properties and Performance of Polymer Electrolyte Membranes for the Hybrid Sulfur Electrolyzer

The water transport and SO2 crossover in the hybrid sulfur cycle electrolyzer were quantified for a polyphenylene-based proton exchange membrane and compared to the performance of industry-standard Nafion membranes. While Nafion exhibits good performance, there exists the possibility of a significant SO2 crossover, which can modify the electrode composition, consume current that should be used for hydrogen production, introduce SO2 to the hydrogen stream, and result in a loss of sulfur from the system. Recent research has focused on polyphenylene-based membranes that have exhibited high current density with good stability both chemical and temperature while limiting SO2 crossover. In this paper, we extend our previous water-transportmodeling work on Nafion membranes to this polymer electrolyte and directly compare the two in terms of electrolyzer performance and SO2 crossover. We show the ability of polyphenylene membranes to operate at elevated temperatures with improved performance over lower temperatures; the high temperature performance exceeds that of Nafion membranes.

Bio micro fuel cell grand challenge final report.

Christopher Apblett, Kent Schubert, Bruce Kelley, Andrew Walker, Blake Simmons, Ted Borek, Stephen Meserole, Todd Alam, Brian Cherry, Greg Roberts, Jim Novak, Jim Hudgens, Dave Peterson, Jason Podgorski, Susan Brozik, Jeb Flemming, Stan Kravitz, David Ingersoll, Steve Eisenbies, Randy Shul, Sarah Rich, Carrie Schmidt, Mike Beggans, Jeanne Sergeant, Chris Cornelius, Cy Fujimoto, Micheal Hickner, Swapnil Chabra, Suzanne Ma, Joanne Volponi, Micheal Kelly, Kevin Zavadil, Chad Staiger, Patricia Dolan, Monica Manginell, Jason Harper, Dan Doughty, Steve Casalnuovo