Abstract
The anodic behaviour of nickel in liquid hydrogen fluoride (HF) containing small water concentrations has been investigated. Anodic polarisation studies, anode dissolution measurements, chronopotentiograms, and differential capacitance measurements were made. Potential-decay measurements were also made to determine the reversible fluorine potential, found to be 2·62 V vs Hg/Hg 2F 2 at −20°C. Trace amounts of water in HF result in the formation of a passivating film on anodically polarized nickel electrodes. In pure HF nickel electrodes are attacked at a high rate to form NiF 2, which adheres to the electrode. The porous NiF 2 film strongly sorbs large quantities of F 2 at fluorine-evolution potentials; thus no potential dependence of electrochemical fluorinations can be expected under these conditions.
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