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Manufacturing Issues • Build on and exploit manufacturing technology under development for PEM FC applications. • Develop non-carbon supported electrode and catalyst manufacturing processes. • Develop seals for high pressure electrolysis systems. • URFC departs from automotive fuel cell production and will need new manufacturing methods. • Definitions of Low Rate Initial Production and Full Volume Production needed. • Cost analysis needed for high volume manufacturing of reversible fuel cell systems. • At what pressure are electrolyzers and fuel cells optimized based on cost drivers. Miscellaneous • Are there alternative chemistries such as hydrogen/bromine that make sense for regenerative fuel cells? Systems that eliminate the oxygen reduction reaction over potential should be considered. Highlights of PEM Reversible Fuel Cell Breakout: Group 2 Issues unique to URFC • Hydrogen electrode structure/catalyst used for both hydrogen production and hydrogen oxidation. • Oxygen electrode structure/catalyst used for both oxygen production and oxygen reduction. • Oxygen electrode catalyst platinum black; NSTF potential future catalyst. Issues unique to DRFC • The DRFC approach enables optimization of MEAs for each mode in separate stacks. • Oxygen fuel cell catalyst: can benefit from automotive and other fuel cell applications. • Oxygen evolution catalyst IrO2 and develop IrO2 NSTF catalyst. Power Range • 10 kW to several MW acceptable for both URFC and DRFC. • Application dependent choice for URFC and DRFC. • Backup power uses a low rate electrolysis system with a high rate fuel cell system. The optimum system for backup power is the DRFC. • Distributed energy or load shifting can use either URFC or DRFC. • Applications requiring high energy density favor URFC. 12PDF Image | Reversible Fuel Cells Workshop Summary Report
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