Electrochemical performance of a multi-tubular fuel cell and electrolyzer array

Miniaturization of tubular membrane and electrode assemblies (MEAs) allows compact fuel cells and electrolyzers to be developed with power density projections of 6 kW/liter and 11 kW/kg. These tubular MEAs have been assembled into multi-tube arrays and connected in either serial or parallel arrangements. Pressure testing and leak testing of these arrays has shown no signs of leakage indicating the viability of assembling these tubes into electrochemical stacks. The tubular MEAs in these arrays have been studied by assessing the electrochemical performance of each tubular MEA in the stack. These investigations have indicated no significant performance issues between the interior and exterior tubes in the array. The operation of these tubular MEA arrays in the electrolysis mode supports the use of these miniaturized tubes for a reversible fuel cell and electrolyzer energy storage system.