SmCo_(0.8)Fe_(0.2-x)Ni_xO_3(x=0,0.1,0.2)系列陶瓷在低温常压电化学合成氨中的阴极催化性能研究

Cathode Catalytic Performance of SmCo_(0.8)Fe_(0.2-x)Ni_xO_3 Ceramics in Electrosynthesis Ammonia at Atmospheric Pressure and Low Temperature

用溶胶-凝胶法制备了Ce0.8Sm0.2O2-δ(SDC)和SmCo0.8Fe0.2-xNixO3(x=0,0.1,0.2)(SCFN)系列纳米粉体并烧结为陶瓷片,用XRD、TEM、SEM对粉体和烧结体结构进行了表征,分别以SCFN系列陶瓷为阴极,Nafion膜为质子交换膜,Ni-SDC金属陶瓷为阳极,银-铂网做集流体组成电解池.以湿氢气和氮气为原料,在低温常压下研究了SCFN系列陶瓷材料在电化学合成氨中的阴极催化性能,结果表明:SCFN中Fe、Ni的含量影响其阴极催化性能,其中以SmCo0.8Fe0.1Ni0.1O3的催化性能最佳,在353K和常压条件下,合成氨速率达到9.69×10-9mol·s-1·cm-2.

The powders of Ce0.8Sm0.2 O2-δ（SDC） andSmCo0.8Fe0.2-xNix O3（x=0, 0.1, 0.2） （SCFN） were synthesized by the sol-gel method and the powders were sintered to ceramics pellets. The products and sintered pellets were characterized by XRD TEM and SEM. It was studied that the cathode catalytic performance of SCFN in electrosynthesis ammonia from wet hydrogen and nitrogen at atmospheric pressure and low temperature, using SCFN as cathode, Nation Membrane proton exchange membrane as electrolyte, Ni-Ce0.8Sm0.2O2-δ（SDC） as anode and silver-platinum as current collector to assemble a electrolytic cell. The results demonstrated that the cathode catalytic performance of SCFN depended on the content of Fe and Ni .The SmCo0.8Fe0.1Ni0.1O3 is the best cathode catalyzer among SCFN at atmospheric pressure and low temperature. The rate of evolution of ammonia is up to 9.69×10^-9 mol·s^-1.cm^-2 at 353K and atmospheric pressure.