Abstract: NiO-Ce0.8Sm0.2O1.9 composite powder was synthesized by an improved coprecipitation method—the buffer solution method and the phase composition and particle size of the composite powder were characterized by X-ray diffraction and transmission electron microscope. Then NiO/SDC ceramic and Ni/SDC cermet were fabricated from NiO-SDC powder by the buffer solution method and by mechanical mixing NiO and Ce0.8Sm0.2O1.9 powder, respectively, and their microstructure and related property were also compared. The results show that NiO-SDC powder by the buffer solution method has nanometer particle size with cubic NiO and SDC phase. NiO/SDC ceramic and Ni/SDC cermet fabricated from NiO-SDC powder by the buffer solution method has more homogeneous, finer grain and pore size and higher electrical conductivity than those from the mechanically mixed NiO-SDC powder. SOFC based on Ni/SDC anode prepared from the buffer solution NiO-SDC powder shows higher open circuit voltage and power density. It is contributed to the optimized microstructure and higher conductivity of the Ni/SDC anode.
Preparation and characterization of Ni/SDC for SOFC anodes by buffer-solution method
Abstract:
NiO-Ce0.8Sm0.2O1.9 composite powder was synthesized by an improved coprecipitation method—the buffer solution method and the phase composition and particle size of the composite powder were characterized by X-ray diffraction and transmission electron microscope. Then NiO/SDC ceramic and Ni/SDC cermet were fabricated from NiO-SDC powder by the buffer solution method and by mechanical mixing NiO and Ce0.8Sm0.2O1.9 powder, respectively, and their microstructure and related property were also compared. The results show that NiO-SDC powder by the buffer solution method has nanometer particle size with cubic NiO and SDC phase. NiO/SDC ceramic and Ni/SDC cermet fabricated from NiO-SDC powder by the buffer solution method has more homogeneous, finer grain and pore size and higher electrical conductivity than those from the mechanically mixed NiO-SDC powder. SOFC based on Ni/SDC anode prepared from the buffer solution NiO-SDC powder shows higher open circuit voltage and power density. It is contributed to the optimized microstructure and higher conductivity of the Ni/SDC anode.
图2 由缓冲溶液法合成的NiO-SDC粉体 所制备的NiO/SDC复相陶瓷烧结体(a)及 H2还原后得到的Ni/SDC金属陶瓷(b) 试样表面的SEM像 Fig.2 SEM photographs of NiO/SDC(a) and Ni/SDC(b) prepared from NiO-SDC powders by buffer solution method
图3 由机械混合NiO-SDC粉体所制备的 NiO/SDC复相陶瓷烧结体(a)及 其氢气还原后试样(b)表面的SEM像 Fig.3 SEM photograph of NiO/SDC(a) and Ni/SDC(b) prepared from mechanically mixed NiO-SDC powders