Electrical Evaluation of Doped and Undoped Cobalt Chromite as the Interconnection Material for High-Temperature, Zirconia-Electrolyte, Fuel-Cell Batteries

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Abstract
Cobalt chromite is an electronically conductive oxide stable in both air and mixtures of and having oxygen partial pressures greater than 10−15 atmospheres at 1000°C. It is potentially useful as a material to interconnect cells of a high‐temperature, zirconia‐electrolyte, fuel‐cell battery. The 1000 °C resistivities and conductivity‐types of cobalt chromite doped with manganese and vanadium were measured over the range of oxygen partial pressures of interest for fuel cell operation. Vanadium‐doped cobalt chromite increased in resistivity on exposure to air. Two mole per cent manganese doping resulted in stable 1000°C resistivities of 6 ohm‐cm in air and 50 ohm‐cm in mixtures having an oxygen partial pressure of 10−15 atm. These resistivities are sufficiently low to make manganese‐doped cobalt chromite useful for the fuel‐cell battery application.

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