How does electrolysis work?
Electrolysis uses external electrical energy to drive a nonspontaneous redox reaction. Ions carry charge through an electrolyte, while electrons travel through the external circuit. It is used in industrial metal production and surface treatment.
What happens at the electrodes?
Oxidation occurs at the anode and reduction at the cathode. The power source drives these changes in an electrolytic cell. Products depend on electrode material, solvent, concentration, and applied potential, not just the electrolyte's name. Water may participate in an aqueous salt solution, so its products can differ from those obtained using a molten salt.
Efficiency and safety limits
Faraday's laws relate transferred charge to transformed material, while side reactions can reduce actual efficiency. Water electrolysis can produce hydrogen and oxygen, but requires electricity from another source and does not create unlimited energy. Flammable gases, corrosive solutions, or toxic products can form, so improvised home experiments are inappropriate. Industrial systems include gas separation and temperature management.