Electrolyte Stability in Direct-Carbon Fuel Cells with Molten Sb Anodes

Abstract

The long-term stability of direct carbon fuel cells with oxygen ion conducting solid electrolytes and molten Sb anodes has been examined. We have investigated previously observed etching phenomenon as a function of the electrolyte composition and cell operating conditions. We conclusively show that electrolyte etching is not electrochemical in nature, but rather results from chemical reaction between the electrolyte and Sb2O3 that is produced during cell operation. Chemical reaction tests also support this conclusion.