Abstract
The electrochemical behaviour of Ni electrodes in a KNO 3 melt in the 350–400°C temperature range has been studied, using the cyclic voltammetry method. The occurence of an anodic double-peak is attributed to some ionic species of nickelite (NiO 2− 2) and nickelate (NiO − 2) type, of a very different electrochemical stability. The decrease of the KNO 3 local basicity, in the presence of Na + and NO − 2 ions, leads to the disappearance of the anodic double peak. The influence of scan rate and temeprature on the anodic branch of the cyclovoltammograms is also discussed.
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