Measurements of Double‐Layer Capacitance at the Preoxidized Ni/Fused Na2 SO 4 Interface

The double‐layer capacitance in a fused film on a preoxidized Ni electrode at 1200 K was measured by electrochemical impedance spectroscopy. The capacitance‐potential curve has a maximum at a potential of −0.6 V vs. , silica reference electrode, resulting from the additional contribution of a faradaic reaction.