SDC和SSC在低温常压电化学合成氨中的性能研究

Property Research of SDC and SSC in Ammonia Synthesis at Atmospheric Pressure and Low Temperature

用溶胶-凝胶法制备了Ce0.8Sm0.2O2-δ(SDC)和Sm0.5Sr0.5CoO3-δ(SSC)超细粉体,采用XRD,TEM和SEM等对粉体进行表征.分别以Ni-SDC和SSC为阴极,磺化聚砜质子交换膜为电解质,Ni-SDC金属陶瓷为阳极,银-铂网做集流体组成单电池,在25～120℃温度范围内研究了其电导率随温度变化关系及在电化学合成氨中的性能.结果表明:在25～120℃温度范围内,使用Ni-SDC和SSC为阴极均有氨气生成,而SSC电化学合成氨的性能优于Ni-SDC,在80℃时合成氨产率达到6.5×10-9mol·s-1·cm-2.

The powders of Ce0.8Sm0.2O2-δ （SDC） and Sm0.5Sr0.5CoO3-δ （SSC） were synthesized by a sol-gel method, and characterized by XRD, TEM and SEM measurements. Ammonia was synthesized from wet hydrogen and nitrogen at atmospheric pressure in a solid state proton conducting cell reactor with added voltage, using SSC or Ni-SDC as a cathode, sulfonated polysulfone proton exchange membrane as an electrolyte, Ni/SDC as an anode, and silver-platinum as a current collector. Protonic conductivity was tested at low temperature from 25 to 120 ℃. The results demonstrated that ammonia was synthesized in this range of temperature, by using SDC or SSC as the cathode and SSC had the higher rate of evolution of ammonia, with the highest rate being up to 6.5 ×10^-9 mol·s^-1·cm^-2 at 80 ℃.