NOVELTY - Electrolysis system (100) comprises electrolysis cells within electrolysis tank (101); high voltage source with second output voltage electrically connected to pair(s) of high voltage electrodes (119A, 120A), with second output voltage higher than first output voltage. Each cell includes membrane (105A) dividing electrolysis cell into first and second region with membrane permitting ion and electron exchange between regions, and restricting hydrogen gas flow and oxygen gas flowing between regions.    USE - Electrolysis system for producing hydrogen.    ADVANTAGE - The system provides high output efficiency.    DETAILED DESCRIPTION - Electrolysis system (100) comprises electrolysis cells within electrolysis tank (101), low voltage source with output voltages electrically connected to pair(s) of low voltage electrodes of first and second type of each electrolysis cell; high voltage source with second output voltage electrically connected to pair(s) of high voltage electrodes (119A, 120A), with second output voltage higher than first output voltage; and simultaneously pulsing unit of voltage source at a specific frequency and a specific pulse duration. Each cell includes membrane (105A) dividing electrolysis cell into first and second region with membrane permitting ion and electron exchange between regions, and membrane restricting hydrogen gas flow and oxygen gas flowing between regions; pair(s) of low voltage electrodes of a first type and comprising a first material and including anode(s) of first type and cathode(s) of first type; and pair(s) of low voltage electrodes of a second type (117A, 118A) and comprising second material and including anode(s) of second type and cathode(s) of second type. An INDEPENDENT CLAIM is included for a method of operating an electrolysis system.    DESCRIPTION OF DRAWING(S) - The drawing shows a top perspective view of the electrolysis system.    Electrolysis system (100)    Electrolysis tank (101)    Membrane (105A)    Low voltage electrodes of a second type (117A, 118A)    High voltage electrodes (119A, 120A)