TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The cathode material is at least one of aluminum, gold, silver, carbon, cadmium, cobalt, chromium, copper, copper alloys, gallium, mercury, indium, molybdenum, niobium, nickel, nickel alloys, nickel-iron alloys, tin, tin alloys, titanium, vanadium, tungsten, zinc, Elgiloy (RTM: Cobalt, chromium and nickel alloy), Nichrome (RTM: Non-magnetic alloy of nickel, chromium and iron), austenitic steel, duplex steel, ferritic steel, martensitic steel, stainless steel, degenerately doped p-silicon, degenerately doped p-silicon:arsenic or degenerately doped p-silicon:boron. The electrolyte is at least one of sodium sulfate, potassium chloride, sodium nitrate, sodium chloride, sodium fluoride, sodium perchlorate, potassium perchlorate, potassium silicate, calcium chloride, hydrogen ion, lithium ion, sodium ion, potassium ion, rubidium ion, cesium ion, calcium ion, ammonium ion, alkylammonium ion, fluoride, chloride, bromide, iodide, astatine ion, alkyl amine, borates, carbonates, nitrites, nitrates, phosphates, polyphosphates, perchlorates, silicates, sulfates or tetraalkyl ammonium salt.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The electrochemical cell comprises a divided electrochemical cell. Electrical potential of the cathode is 0-(-1) volt.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method of purifying carbon dioxide further comprises: separating the carbon dioxide from the solution; pressurizing the electrochemical cell during the purification; and adding to the solution at least one hydrogen inhibitor, heterocyclic compound or alcohol. The step of reducing uses a single electron per carbon atom. The step of oxidizing uses at most two electrons per carbon atom. Preferred Components: The catalyst is at least one of amino-thiazole, aromatic heterocyclic amines with aromatic 5-membered heterocyclic ring, aromatic heterocyclic amines with 6-membered heterocyclic ring, azoles, benzimidazole, bipyridines, furan, imidazoles, imidazole related species with at least one 5-membered ring, indoles, pyridines, pyridine related species with at least one 6-membered ring, pyrrole, thiophene or thiazoles. The compounds comprise at least one of oxalate, oxalate salts, organic acids, oxalic acid, glyoxylic acid or glyoxal. EXAMPLE - No suitable example given.