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Abstract: For hydrogen generation from an aqueous alkaline NaBH4 solution, Co-B catalyst was prepared by the chemical reduction method using NaBH4 as a reduction chemical. To design a hydrogen generator, hydrogen generation rate was measured using the Co-B catalyst as a function of solution temperature, amount of catalyst loading, NaBH4 concentration, and NaOH (a base-stabilizer) concentration. Activation energy for the hydrogen generation reaction was measured to be 64.87kJmol−1. Compared to Ru catalysts previously used, the low-cost Co-B catalyst exhibited comparable activity for the hydrogen generation reaction. Using the hydrogen generation system employing the Co-B catalyst, a 2W polymer electrolyte membrane fuel cell (PEMFC) stack was operated and successfully powered a cellular phone. [Copyright &y& Elsevier]