# US 7,611,618 B2 · Method of using an electrolysis apparatus with a pulsed, dual voltage, multi-composition electrode assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,618 B2 - Document ID: US7611618B2 - Status: Granted - Kind: B2 - Application number: 11/707,457 - Filed: 2007-02-13 - Published: 2007-12-13 - Granted: 2009-11-03 - Earliest claimed: 2006-06-09 - Assignees: Nehemia Davidson - Inventors: Nehemia Davidson - Web page: https://patentgrep.com/patent/US7611618B2 ## CPC - C25B 9/17: Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof - C25B 1/04: by electrolysis of water - C25B 9/19: with diaphragms - C25B 11/02: characterised by shape or form - C25B 15/00: Operating or servicing cells - Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis - C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A method of operating an electrolysis system (100) to achieve high hydrogen output flow rates is provided. At least three types of electrodes are positioned within an electrolysis tank (101), the three types including at least one pair of low voltage electrodes (115/117) comprised of a first material, at least one pair of low voltage electrodes (117/118) comprised of a second material different from the first material, and at least one pair of high voltage electrodes (121/122). The low voltage and high voltage cathode electrodes are positioned within one region of the tank (101) while the low voltage and high voltage anode electrodes are positioned within the second region of the tank (101), the two regions separated by a membrane (105). The tank (101) is filled with an electrolyte containing water (103). The power supplied to the low and high voltage electrodes is simultaneously pulsed. ## Claims ### Claim 1 A method of operating an electrolysis system comprising the steps of: positioning a membrane within an electrolysis tank, said membrane separating said electrolysis tank into a first region and a second region; filling said electrolysis tank with water and an electrolyte; positioning at least one pair of low voltage electrodes of a first type within said electrolysis tank, wherein said at least one pair of low voltage electrodes of said first type are fabricated from a first material, wherein each pair of low voltage electrodes of said first type includes at least one low voltage cathode electrode of said first type and at least one low voltage anode electrode of said first type, wherein each low voltage cathode electrode of said first type is positioned within said first region and each low voltage anode electrode of said first type is positioned within said second region; positioning at least one pair of low voltage electrodes of a second type within said electrolysis tank, wherein said at least one pair of low voltage electrodes of said second type are fabricated from a second material, wherein said first material is different from said second material, wherein each pair of low voltage electrodes of said second type includes at least one low voltage cathode electrode of said second type and at least one low voltage anode electrode of said second type, wherein each low voltage cathode electrode of said second type is positioned within said first region and each low voltage anode electrode of said first second is positioned within said second region; positioning at least one pair of high voltage electrodes within said electrolysis tank, wherein each pair of high voltage electrodes includes at least one high voltage cathode electrode and at least one high voltage anode electrode, wherein each high voltage cathode electrode is positioned within said first region and each high voltage anode electrode is positioned within said second region; positioning said low voltage electrodes of said first and second types and said high voltage electrodes within said electrolysis tank such that each low voltage electrode of said at least one pair of low voltage electrodes of said first type and each low voltage electrode of said at least one pair of low voltage electrodes of said second type is positioned between said at least one pair of high voltage electrodes; applying a low voltage to said at least one pair of low voltage electrodes of said first type and to said at least one pair of low voltage electrodes of said second type, wherein said applied low voltage is pulsed at a first frequency and with a first pulse duration; and applying a high voltage to said at least one pair of high voltage electrodes, wherein said applied high voltage is pulsed at said first frequency and with said first pulse duration, and wherein said high voltage applying step is performed simultaneously with said low voltage applying step. ### Claim 2 (depends on 1) The method of claim 1, further comprising the steps of: fabricating said at least one pair of low voltage electrodes of said first type from said material; fabricating said at least one pair of low voltage electrodes of said second type from said second material; fabricating said at least one pair of high voltage electrodes from a third material; and selecting said first, second and third materials from the group consisting of steel, nickel, copper, iron, stainless steel, cobalt, manganese, zinc, titanium, platinum, and alloys of steel, nickel, copper, iron, stainless steel, cobalt, manganese, zinc, titanium, and platinum. ### Claim 3 (depends on 1) The method of claim 1, wherein said at least one pair of high voltage electrodes are fabricated from a third material, wherein said method further comprises the step of selecting said first, second and third materials from the group consisting of steel, nickel, copper, iron, stainless steel, cobalt, manganese, zinc, titanium, platinum, and alloys of steel, nickel, copper, iron, stainless steel, cobalt, manganese, zinc, titanium, and platinum. ### Claim 4 (depends on 1) The method of claim 1, further comprising the steps of selecting said high voltage within the range of 50 volts to 50 kilovolts and selecting said low voltage within the range of 3 volts to 1500 volts. ### Claim 5 (depends on 1) The method of claim 1, further comprising the steps of selecting said high voltage within the range of 100 volts to 5 kilovolts and selecting said low voltage within the range of 12 volt to 750 volts. ### Claim 6 (depends on 1) The method of claim 1, further comprising the step of selecting said high voltage and said low voltage such that a ratio of said high voltage to said low voltage is at least 5 to 1. ### Claim 7 (depends on 1) The method of claim 1, further comprising the step of selecting said high voltage and said low voltage such that a ratio of said high voltage to said low voltage is within the range of 5:1 to 20:1. ### Claim 8 (depends on 1) The method of claim 1, further comprising the step of selecting said high voltage and said low voltage such that a ratio of said high voltage to said low voltage is within the range of 5:1 to 33:1. ### Claim 9 (depends on 1) The method of claim 1, further comprising the step of selecting a concentration of said electrolyte between 0.05 percent and 0.5 percent by weight. ### Claim 10 (depends on 1) The method of claim 1, further comprising the step of selecting said first frequency to be within the range of 50 Hz and 5 kHz. ### Claim 11 (depends on 1) The method of claim 1, further comprising the step of selecting said first pulse duration to be within the range of 10 nanoseconds and 0.5 seconds. ### Claim 12 (depends on 1) The method of claim 1, further comprising the step of optimizing at least one of said low voltage, said high voltage, said first frequency, and said first pulse duration for maximum hydrogen gas flow. ### Claim 13 (depends on 12) The method of claim 12, wherein said optimizing step is performed after completing at least 6 hours of continuous electrolysis. ### Claim 14 (depends on 12) The method of claim 12, wherein said optimizing step is performed repeatedly. ### Claim 15 (depends on 12) The method of claim 12, wherein said optimizing step is automated. ### Claim 16 (depends on 1) The method of claim 1, wherein said step of applying said high voltage to said at least one pair of high voltage electrodes is performed intermittently after performing said method of operating an electrolysis system for a predetermined period of time. ### Claim 17 (depends on 1) The method of claim 1, wherein said step of applying said high voltage to said at least one pair of high voltage electrodes is performed intermittently after a predetermined flow rate of hydrogen is achieved.