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Metal hydride systems for hydrogen storage and supply for stationary and automotive low temperature PEM fuel cell power modules

Metal Hydrides (MH) provide efficient hydrogen storage for various applications, including Low-Temperature PEM Fuel Cells (LT-PEMFCs), when system weight is not a major and critical issue. Endothermic dehydrogenation of MH leading to decreased rates of H2 evolution eliminates the risk of accidents even in the case of rupture of the hydrogen storage containment. At the same time, it poses a number of challenges related to the necessity of sufficient H2 supply for stable FC operation. This presentation overviews recent efforts in MH hydrogen storage and supply systems for LT-PEMFC applications, including the ones developed at SAIAMC (University of the Western Cape). The SAIAMC systems are characterized by hydrogen storage capacities ranging from 40 NL to ~10 Nm3 H2 in turns providing stable operation for stationary and mobile FC power modules (from a few W to several kW). They use unstable hydride materials (equilibrium H2 pressure at ambient temperature around 10 bar) that, in combination with special engineering solutions of MH containers (both liquid- and air-heated- cooled), and optimized system layout, facilitates H2 supply to both liquid- and air- cooled LT-PEMFCs.

Metal Hydrides; Low-Temperature PEM Fuel Cells; Hydrogen Storage and Supply

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