The effect of coal syngas containing AsH 3 on the performance of SOFCs: Investigations into the effect of operational temperature, current density and AsH 3 concentration

Abstract

The performance of solid oxide fuel cells (SOFCs) using simulated coal-derived syngas, with and without arsine (AsH 3), was studied. Anode-supported SOFCs were tested galvanostatically at 0.25 and 0.5 A cm −2 at 750 and 800 °C with simulated coal syngas containing 0.1, 1, and 2 ppm AsH 3. The tests with simulated coal syngas containing 1 ppm AsH 3 show little degradation over 100 h of operation. The tests with simulated coal syngas containing 2 ppm AsH 3 show some signs of degradation, however no secondary arsenide phases were found. Extended trial testing with 0.1 ppm AsH 3 showed degradation as well as the formation of a secondary nickel arsenide phase in the anode of the SOFC.