Hydrogen supply system for generating a hydrogen gas from an electrolyte water by water splitting

A hydrogen gas supply system for generating a hydrogen gas from water by water splitting, featuring that ethylidyne is released during water splitting, comprising:

• A) a carbon electrode made from a graphite having a sp2 carbon structure and a sp3 carbon structure, wherein the carbon electrode is an expanded carbon sheet made by a flame-irradiation treatment for separating and swelling graphite layers of the carbon sheet after immersing in nitric acid as the oxidizing agent to have a specific gravity of 0.1 to 0.5 g/cm3 and a carbon-oxygen atom ratio of approximately 1 to 1,
• B) an alkaline electrolyte water solution containing caustic soda solution and NaCl, and
• C) a metal electrode capable to be ionized in the alkaline electrolyte water solution and comprising aluminum, wherein the carbon electrode and the metal electrode are not connected with any external circuit, and
• wherein the hydrogen gas is generated due to water splitting by a redox reaction in the alkaline electrolyte water solution, and detection of ethylidyne by means of TOF-ESD (time-of-flight electron-excited ion desorption) microscopy is a property of the expanded carbon sheet after the redox reaction.