Powder electrodes, solid-electrolyte tube

Electrically heated head of a ceramic probe with a solid-electrolyte tube open on both sides and with powder electrodes [60]. 

This cell reaction necessitates a sodium-ion-conductive electrolyte. At present, the best and most stable sodium ion conductor is j8"-alumina. This electrolyte has sufficiently high sodium ion conductivity at temperatures of about 300 °C. The S"-alumina electrolyte is normally designed as a tube, closed at one end, with a negative electrode on the outside and the positive electrode on the inside of the tube. The positive electrode, which consists of nickel chloride, nickel, and salt, throughout the reaction is incorporated in a nickel powder matrix and has a nickel current collector. The positive electrode is solid, as is the ceramic electrolyte therefore the soHd electrode must be made to work together with the soHd electrolyte, so that cell reactions can proceed. This is achieved by using a second electrolyte, sodium aluminum chloride, which is molten at the operating... 

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