Abstract: Powdery mixture containing borate and alkali eat metal, for example, magnesium is prepared. Hydrogen atmosphere is fed to the mixture, for example, from hydrogen gas source. The mixture is reacted in hydrogen atmosphere under pressure below reaction equilibrium pressure where hydride of magnesium can exist in stable.

Abstract: Disclosed is a handy and efficient method for generation of hydrogen gas, in which a reaction medium prepared by dissolving a metal hydrogen complex compound such as sodium borohydride NaBH4 in an aqueous alkaline solution such as a 10% by weight aqueous solution of sodium or potassium hydroxide is brought into contact with a catalyst which is a metal such as cobalt and nickel or a so-called hydrogen-absorbing alloy such as Mg2Ni so that decomposition of the metal hydrogen complex compound proceeds even at room temperature to generate hydrogen gas. The catalytic activity of the catalyst can be increased by subjecting the catalyst to a fluorinating treatment in which the catalyst powder is immersed in an aqueous solution of potassium fluoride acidified with hydrofluoric acid.

Abstract: A high-efficiency liquid fuel cell is disclosed, which comprises, as an assembly, a negative or hydrogen electrode made from a hydrogen absorbing alloy such as LaNi4.7Al0.3 preferably fluorinated on the surface, an aqueous alkaline electrolyte solution in contact with the hydrogen electrode, which contains, as a hydrogen source material, a metal-hydrogen complex compound such as KBH4 and LiAlH4 dissolved in an aqueous alkaline solution, a positive or oxygen electrode, an oxygen source in contact with the oxygen electrode and a permeable membrane partitioning the space between the electrodes. The oxygen source in contact with the oxygen electrode can be either an oxidizing gas such as oxygen and air or an aqueous solution of a water-soluble oxidizing compound such as hydrogen peroxide.