Operation of a PEM fuel cell with LaNi 4.8Sn 0.2 hydride beds

Abstract

A series of measurements were performed using metal hydride sorbent beds to operate a 1.0 kW capacity proton electrolyte membrane (PEM) fuel cell hybrid power system. Two sorbent beds were filled with LaNi 4.78Sn 0.22 alloy and each unit had a maximum storage capacity of ∼280 sL hydrogen. A single sorbent bed was able to supply hydrogen gas for ∼20–25 min operation at 30 A net current and ∼900 W output power. These hydride beds were also capable of supplying sufficient hydrogen flows and pressures to produce up to ∼1.1 kW output power from the fuel cell for shorter durations. Good correlations for hydrogen consumption rates and power outputs were obtained and boundaries parameters for continual operation were identified. Various input and output parameters were recorded and analyzed to relate hydride bed, fuel cell, and battery behavior and assess their dynamic interactions.