Cathode Catalytic Performance Of SCFN In Electrosynthesis Ammonia At Atmospheric Pressure And Low Temperature

In this thesis, the precursors of Ce_0.8Sm_0.2O_2-δ(SDC) and SmCo_0.8Fe_0.2-xNi_x O₃(x=0, 0.1, 0.2) (SCFN) were synthesized by the sol-gel method and sintered at 1150℃. The multiple Oxides were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively.The optimum voltage and temperature were determined by single cell which composed of Nafion membrane, Ni-SDC anode ceramic, SmCo_0.8Fe_0.2-xNi_x O₃ (x = 0, 0.1, 0.2) (SCFN) cathode ceramic. The optimum voltage is 2.00 V and optimum temperature is 80℃. The optimum voltage and temperature were determined by single cell which composed of Nafion membrane, Ni-SDC anode powder supported with carbon paper,SmCo_0.8Fe_0.2-xNi_xO₃ (x = 0, 0.1, 0.2) (SCFN) and SmCoO₃(SCO) cathode powder supported with carbon paper. The persistence of ammonia synthesis rate was discussed, using SmCo_0.8Fe_0.1Ni_0.1O₃ as power membrane electrode under the optimum voltage. The rate of ammonia synthesis using power membrane electrode and ceramic electrode of SmCo0.8Fe0.1Ni0.1O3 were compared at room temperature conditions.