Abstract
The electrochemical activity of high surface area lithiated nickel oxides, prepared by freeze-drying or hydroxide precipitation, towards the reduction of oxygen in KOH, was investigated as a function of surface are, temperature and oxygen partial pressure. For very high surface area oxides (180 m 2/g) electrochemically reversible behaviour was achieved at 150 instead of 230°C for the lower surface area oxides. The evidence suggests that oxygen is being reduced directly to hydroxyl ions without forming the peroxide intermediate. The results concur with the Joint Pseudosplitting/Dissociative Adsorption mechanism proposed by Evans, and also provide further evidence that the temperature at which oxygen is dissociatively chemisorbed on lithiated nickel oxides may be related to the Neel Temperature.
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