NOVELTY - Producing hydrogen comprising a reaction and formation step (2) and a reaction and acceleration step (3), where the reaction and formation step is performed by providing a reaction object made of a metallic material; cleaning the reaction object; and having the cleaned reaction object chemically contacted with an electrolyte solution.    USE - The method is useful for producing hydrogen (claimed).    ADVANTAGE - The present invention provides an innovative method for producing hydrogen which takes metal, metallic alloys, or metal scrap as reaction object to react with an electrolyte solution through a chemical reaction or simultaneously through an electrochemical reaction to produce hydrogen, which can be utilized in industrial plants (such as a steel-making plant or incinerating plant), large hydrogen devices (stationary fuel cells) or portable hydrogen devices. In addition, an electrolyte solution of metal ions generated after hydrogen production reaction is able to be recycled as electrolyte and electrode material of rechargeable batteries or regenerated to a metal by electrolysis method as material for producing hydrogen, which completely achieves economic and practical purposes of carrying out oxidation reduction and prevents the second environmental pollution. The method for producing hydrogen is much more effective by accelerating hydrogen production rate, in which method organic acid or non-organic acid is added during a process of a chemical reaction or during processes of the chemical reaction and an electrochemical reaction at the same time. The method for producing hydrogen includes a reaction and formation step, which is able to be performed in several ways, where one of the ways to perform the reaction and formation step is defined by taking metal, metallic alloys, or metal scrap as reaction object, the reaction object after being cleaned and contacted with an electrolyte solution resulting in chemical reaction thus to produce hydrogen and by-products thereof. The reaction and acceleration step is to combine the metal, metallic alloys, or metal scrap with a catalyst, and then immersed in an acidic electrolyte solution to result in chemical and electrochemical reactions thus to accelerate hydrogen production rate. The method for producing hydrogen further includes an extended treatment step, in which an electrolyte solution of metal ions generated after hydrogen production reaction is able to be reapplied to rechargeable batteries by being dried and treated with appropriate solutions or the electrolyte of metal ions can be reduced by way of electrolysis to be recycled for hydrogen production.    DETAILED DESCRIPTION - Producing hydrogen comprising a reaction and formation step (2) and a reaction and acceleration step (3), where the reaction and formation step is performed by (a) providing a reaction object made of a metallic material; (b) cleaning the reaction object; and (c) having the cleaned reaction object chemically contacted with an electrolyte solution so as to generate a chemical reaction and to produce hydrogen and byproducts thereof; and the reaction and acceleration step performed to accelerate hydrogen production rate through the chemical reaction by adding an acidic material while performing the reaction and formation step.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart depicting a method for producing hydrogen.    Formation step (2)    Acceleration step (3)    Extended treatment (4)    Reaction object (20)    Cleaning step (21)    Smashing (23)    Electrolyte solution (25)    Non-organic acid (30)    Drying (40)    THF (41)    Electrolysis (42)    Hydrogen (50)    By-product (51)    Metal ion (52)    Hydrogen device (60)    Rechargeable battery (61)    Electrode material (62)    Anode metal (201)    Cathode metal (202)