Potassium borohydride (KBH 4 ) reacted very slowly with water to liberate 4mol of hydrogen/mol of compound at room temperature. The hydrolysis and stability conditions of KBH 4 investigated depend on KBH 4 concentrations, concentration of alkaline solutions, temperatures and electrical field intensity. Yield of produced hydrogen by self-hydrolysis of KBH 4 increases as the temperature increased and it produced 53.9% yield at the end of 300min at 60°C. The reaction rate order of hydrolysis of KBH 4 in aqueous solution is found at about 0.7–0.8 and the activation energy for hydrolysis is calculated as 14,700kJ/mol. Potassium borohydride is stable both in room temperature and in aqueous alkaline solution. In this study, the electrical field that is not needed for catalytic activity was used for the hydrolysis of KBH 4 aqueous solution. It was found that 6mol of hydrogen/mol of potassium borohydride was liberated in the presence of electrical field, whereas 4mol of hydrogen was produced in the absence of electrical field per mol of potassium borohydride.