Abstract
Praseodymium oxides (Pr4O7 and Pr6O11) were added into Ni-Mo-Ce0.8Sm0.2O1.9 (SDC) anode. The single cell with PrO-Ni-Mo-SDC as the anode and SDC-carbonate composite as the electrolyte showed a higher cell performance and a lower polarization resistance with H2 as the fuel. It is hypothesized that PrO-Ni-Mo-SDC possesses more lattice oxygen atoms, and the Ce4+ and Ni2+ in PrO-Ni-Mo-SDC have lower reduction temperatures than those in Ni-Mo-SDC. Using methanol as the fuel, the maximum power density of the single cell with PrO-Ni-Mo-SDC as the anode was 594 mW cm−2 at 700 °C, which was slightly lower than that of the single cell with Ni-Mo-SDC as the anode. However, the single cell with PrO-Ni-Mo-SDC as the anode showed a better stability, which is probably due to its better coking resistance. The amount and the graphitization degree of the carbon deposited on PrO-Ni-Mo-SDC were lower than those of the carbon on Ni-Mo-SDC.
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