▎ 摘　　要

NOVELTY - An electrochemical cell apparatus (100) comprises electrolyte chamber (101), and positive electrode (103) and negative electrode (102) disposed in the chamber. Ratio between a surface area of the positive electrode and a surface area of the negative electrode is at least 100:1. USE - An electrochemical cell apparatus is useful for producing hydrogen gas (claimed), which is used in batteries and in internal combustion engines to power vehicles or electric devices. ADVANTAGE - The electrochemical cell has improved electrochemical performance of the intercalation compounds. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) production of hydrogen by hydrolysis which involves applying an electric current between a positive electrode and a negative electrode immersed in an electrolyte solution in an electrochemical cell and maintaining a potential difference of less than or equal to 1.5 V between the electrodes while releasing hydrogen gas at the negative electrode; and (2) producing hydrogen gas which involves applying an electric current to an electrolyte solution in an electrochemical cell, and releasing hydrogen gas at a negative electrode of the electrochemical cell, where electrical energy input of less than or equal to 60 kWh produces 1 kg released hydrogen gas. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of an asymmetric electrochemical cell for producing hydrogen by electrolysis of hydrochloric acid solution. Electrochemical cell apparatus (100) Electrolyte chamber (101) Negative electrode (102) Positive electrode (103) Switching modules (110)