Sm_(2-x)Ce_xCuO_4的制备及在电化学合成氨中的阴极电催化性能

Preparation and Performance of Sm_(2-x)Ce_xCuO_4 Cathode Electrocatalyst in Ammonia Synthesis Electrochemically

用溶胶-凝胶法制备了Sm2-xCexCuO4(SCC,x=0,0.1,0.2,0.3)粉体,干压成片状并烧结为陶瓷,采用XRD、SEM等对SCC粉体和陶瓷片的物象、形貌进行了表征。以SCC陶瓷片为阴极、Nafion膜为质子导体、Ni-Ce0.8Sm0.2O2-δ(Ni-SDC)陶瓷片为阳极,银-铂网为集流体组成单电池,以湿氢气和氮气为原料,在298～373K温度范围内研究了SCC在电化学合成氨中的性能。结果表明在研究的温度范围内和施加电压条件下,使用SCC为阴极均有氨气生成,其中Sm1.8Ce0.2CuO4电化学合成氨速率最高,在353K时合成氨速率为1.05×10-8mol.s-1.cm-2。

The powders of Sm2-xCexCuO4（SCC, x = 0,0. 1,0.2,0.3 ） were synthesized by the sol-gel method. The powders of SCC were dry-pressed to flakes and then sintered to ceramics. The phase composition and morphology of the powders and ceramic flakes were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The properties of SCC in eleetrosynthesis ammonia from wet hydrogen and nitrogen at atmospheric pressure and low temperature were studied. The results demonstrate that ammonia can be synthesized from 298 K to 373 K, using SCC as cathode, Nation proton exchange membrane as electrolyte, Ni-Ce0.8Sm0.2 O2-δ（Ni-SDC） as anode and silver-platinum as current collector. The rate of evolution of ammonia is up to 1.05×10^-8mol·s^-1·cm^-2 at 353 K when Sm1.8Ce0.2 CuO4 is used as cathode.