Integrated AB5-based hydrogen compression and storage system coupled with PEMFC

This work presents an integrated solid-state hydrogen compression and storage system coupled with PEMFC stacks. La 0.9 Ce 0.1 Ni 5 (LCN-C) with low equilibrium pressure (P eq ) is used as hydrogen compression, and La 0.6 Ce 0.4 Ni 5 (LCN-S) with higher P eq is as hydrogen storage. The system involves two compression modules and four storage modules with the LCN-C:LCN-S weight ratio of 1.33:1. LCN-C compresses hydrogen from ∼6 bar to 20–33 bar, subsequently stored in LCN-S. Upon 100 hydrogen compression and storage cycles, the system reversibly delivers up to 0.94 ± 0.12 wt% H 2 . Compatible equilibrium pressures of both hydrides and optimized de/rehydrogenation kinetics through suitable hydride weight ratio influence hydrogen compression and storage efficiency. Electrical power generation of the integrated system coupled with PEMFC stacks is investigated. A constant flow of up to 6.5 L H 2 /min is supplied to three parallel PEMFC stacks for 200 min, producing 1.73 kWh. Up to 89.4 % of total hydrogen capacity is utilized during electricity generation.