Chemically Stable Electrolytes and Advanced Electrode Architectures for Efficient Proton Ceramic Fuel Cells

摘要

BaCe_(0.9)Y_(0.1)O_(2.95), BaCe_(0.8)Zr_(0.1)Y_(0.1)O_(2.95) and BaCe_(0.6)Y_(0.3)Nb_(0.1)O_(2.9) proton conducting electrolytes were successfully elaborated by flash combustion. It was shown by XRD that Zr and Nb-substituted samples have a better stability in CO_2 atmosphere than BaCe_(0.9)Y_(0.1)O_(2.95). The conductivities of BaCe_(0.8)Zr_(0.1)Y_(0.1)O_(2.95) and BaCe_(0.6)Y_(0.3)Nb_(0.1)O_(2.9) reach5 mS cm~(-1) at 600°C, slightly lower than BaCe_(0.9)Y_(0.1)O_(2.95) (10 mS cm~(-1)). Fuel cells with BaCeo.9Yo.1O2.95, BaCe_(0.8)Zr_(0.1)Y_(0.1)O_(2.95) and BaCe_(0.6)Y_(0.3)Nb_(0.1)O_2 as electrolyte, Ni-cermet as anode and Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ) as cathode were successfully prepared and tested in humidified hydrogen from 550 to 700°C. The peak power densities were 161, 20 and 29 mW cm~(-2) at 600°C for the three electrolytes, respectively.