NOVELTY - A hydrogen purification system comprises a gas-receiving chamber to receive gaseous stream of impure hydrogen, an alkaline solution, a power source to provide electrical current, a gas diffusion anode to absorb hydrogen from the gaseous stream of impure hydrogen, and an electrolytic cathode in contact with the alkaline solution to receive the electrical current and to produce a supply of hydrogen upon receiving the electrical current.    USE - For electrochemically purifying impure stream of hydrogen.    ADVANTAGE - The inventive purification system effectively purifies an impure stream of hydrogen.    DETAILED DESCRIPTION - A hydrogen purification system comprises a gas-receiving chamber (14) to receive gaseous stream (12) of impure hydrogen, an alkaline solution, a power source (50) to provide electrical current, a gas diffusion anode (20) adjacent to the gas-receiving chamber and having a gas interface in contact with the gaseous stream of impure hydrogen and an electrolyte interface in contact with the alkaline solution, and an electrolytic cathode (30) in contact with the alkaline solution to receive the electrical current and to produce a supply of hydrogen upon receiving the electrical current. Hydrogen from the gaseous stream of impure hydrogen is absorbed into the gas diffusion anode. INDEPENDENT CLAIMS are also included for:    (1) a hydrogen production and purification system comprising a hydrogen reformer for producing gaseous stream of impure hydrogen from hydrogen-containing organic compound such as natural gas, a heat source for providing heat to the hydrogen reformer to produce the gaseous stream of impure hydrogen, and the above purification system for purifying the gaseous stream of impure hydrogen; and    (2) a method of purifying an impure hydrogen stream by contacting a gas diffusion anode with an impure stream of hydrogen, absorbing hydrogen from the impure hydrogen stream into hydrogen storage alloy of gas diffusion anode, oxidizing the absorbed hydrogen to release hydrogen ions into the alkaline electrolyte, supplying electric current from a power source to an electrolytic cathode in contact with the alkaline solution to produce a supply of pure hydrogen and hydroxyl ions, and collecting the supply of pure hydrogen.    DESCRIPTION OF DRAWING(S) - The figure shows the inventive hydrogen purification system.    Input (11)    Impure hydrogen stream (12)    Gas-receiving chamber (14)    Output (15)    Gas diffusion anode (20)    Electrolytic cathode (30)    Alkaline solution bath (40)    Power source (50)