Fig. 1 - Basic Electrolysis

Electrolysis has been around for over 200 years. An electric current passed through water (H2O) separates it into its components-hydrogen and oxygen.The electricity enters the water at the cathode, a negatively charged electrode, passes through the water, and exits via the anode, the positively charged electrode. The hydrogen is collected at the cathode and oxygen is collected at the anode.