The effects of metal impurities added and dissolved from a cell on both the anodic dissolution of a nickel electrode and the current efficiencies of NF^-formation and total an ode gas were studied in molten NH^F•2HF at 120°C by galvanostatic electrolysis. The current loss caused by anodic dis solution of nickel in a copper cell (3.5%) was larger than those in a steel cell (1.5%) and a nickel cell (2.5%). Mixed gas composed of N 2 , O^, ^0 , NF^, N 2F4 and N 2F 2 was liberated at the nickel

more »

... during electrolysis at 25 mA/ 2 cm . Copper ion almost unaffected the current efficiencies of NF^-formation (60%) and total anode gas (90%), while iron and nickel ions decreased them. The existence of water in the melt lowered the anodic dissolution of nickel electrode. The addition of complexes such as NH.NiF_ and (NH.)_FeF_ in 4 3 4 3 6 the melt was also effective for prevention of the anodic dissolution of nickel, but it decreased the current effi ciencies of NF^-formation and total anode gas. Therefore, it is concluded that heavy metal impurities, especially Ni and Fe compounds, in the electrolyte are detrimental to the reaction proposed. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 207.241.231.81