BEHAVIOR OF NICKEL SPECIES IN MOLTEN LI2CO3-2)=0.9ATM, P(AR)=1 ATM AND P(O-2)=1 ATM(NA2CO3+K2CO3 .2. ELECTROCHEMICAL CHARACTERIZATION UNDERP(CO2)=0.1 ATM+P(O)

Nickel species are characterized under molten carbonate fuel cell acid ic conditions, and under more basic levels in the presence or the abse nce of an oxygen partial pressure. Successive steps relative to the po tential of a nickel foil under open-circuit conditions are analysed in these media. A voltammetric study is developed at a nickel or a gold electrode. Experimental evidence is given for an electrochemical inter calation-deintercalation process involving lithium ions in the NiO lat tice. The difference between a fresh and an aged gold electrode is des cribed. An electrocatalytic process relative to lithiated species is a nalysed under an argon atmosphere with the presence of oxide species.