▎ 摘　　要

NOVELTY - Electrolysis of water involves (a) using an electrolytic cell from a hydrogen cell containing two electrode and a regeneration cell containing at least a sacrificial material, (b) introducing a metal salt solution (e.g. iodide-containing) containing the reduced form of a redox mediator into an electrolytic cell, which acts as an electrolyte and requires a known cell voltage for its overall decomposition and contacting the electrodes for connection to a DC voltage source, (c) applying a voltage within the hydrogen cell that corresponds at least to the known decomposition voltage of the electrolyte, forming the hydrogen to be collected and the oxidized form of the redox mediator (e.g. elemental, dissolved iodine), and (d) introducing the oxidized formed at the anode form of the redox mediator (e.g. iodine) in the electrolyte solution into the regeneration cell via a pump and with the addition of substances. USE - Electrolysis of water during production of hydrogen. ADVANTAGE - The method is economical, enables electrolysis of water capable of efficiently producing hydrogen. DETAILED DESCRIPTION - Electrolysis of water involves (a) using an electrolytic cell from a hydrogen cell containing two electrode and a regeneration cell containing at least a sacrificial material, (b) introducing a metal salt solution (e.g. iodide-containing) containing the reduced form of a redox mediator into an electrolytic cell, which acts as an electrolyte and requires a known cell voltage for its overall decomposition and contacting the electrodes for connection to a DC voltage source, (c) applying a voltage within the hydrogen cell that corresponds at least to the known decomposition voltage of the electrolyte, forming the hydrogen to be collected and the oxidized form of the redox mediator (e.g. elemental, dissolved iodine), and (d) introducing the oxidized formed at the anode form of the redox mediator (e.g. iodine) in the electrolyte solution into the regeneration cell via a pump and with the addition of substances, and separating the oxidized form of the redox mediator (e.g. iodine) by reducing on a sacrificial material to form an insoluble one oxidation product (e.g. insoluble iron oxide or rust), to the reduced form of the redox mediator (e.g. iodide) and returning the solution returned to a hydrogen cell. The products of the electrolysis are gaseous hydrogen and a solid, insoluble compound that catalyzes the anode reaction via a redox mediator equilibrium (e.g. iodide/iodine) without the aid of gas-tight membrane and/or diaphragm to separate the anode and cathode space and without the formation of oxygen and in two to be circulated together cells. An INDEPENDENT CLAIM is included for a water electrolysis cell. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the water electrolysis cell. Cathode of hydrogen cell (2) Spacers between electrodes to avoid short circuits (3) Hydrogen cell anode (4) Electrolyte solution storage tank (5) Pump (6)