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采用EDTA-柠檬酸复合络合法合成了固体氧化物燃料电池(SOFC)纳米阴极粉体La0.6Sr0.4Co0.4Fe0.6O3(LSCF)。运用TG-DTA、FT-IR、XRD、SEM、TEM和电化学分析仪分别对产物形成过程、晶体结构、粉体形貌和电化学性能进行了分析与表征。实验结果表明:在溶胶-凝胶法制备过程中,采用EDTA和柠檬酸同时作为络合剂进行络合反应所制备的凝胶,能在较低的温度(600℃)下生成按化学计量配比的钙钛矿晶体La0.6Sr0.4Co0.4Fe0.6O3,800℃下煅烧的粉体粒子仅为20～30nm,粒子大小较一致,团聚体较少,呈球形。进一步测试其电化学性能,采用该粉体制备阴极的阳极支撑型SOFC纽扣电池(GDC+Ni GDC LSCF)具有较高的性能,以氢气为燃料,空气为氧化剂,在700℃、750℃工作温度下,最大功率密度分别为0.72 W cm-2,0.85 W cm-2,与相同条件下采用柠檬酸单一络合法制备的LSCF粉体相比,电性能有明显提高,其最大功率在700℃、750℃下分别只有0.22 W cm-2、0.46 W cm-2。
Solid-state oxide fuel cell (SOFC) nanocrystalline cathode La0.6Sr0.4Co0.4Fe0.6O3 (LSCF) was synthesized by EDTA-citric acid complexation. The product formation process, crystal structure, powder morphology and electrochemical performance were analyzed and characterized by TG-DTA, FT-IR, XRD, SEM, TEM and electrochemical analyzer. The experimental results show that the gel prepared by the complexation reaction using EDTA and citric acid as the complexing agent can produce the stoichiometric composition at the lower temperature (600 ℃) The ratio of perovskite crystals La0.6Sr0.4Co0.4Fe0.6O3 calcined at 800 ℃ powder particles only 20 ~ 30nm, particle size more consistent, fewer aggregates, spherical. To further test its electrochemical properties, the anode support SOFC coin cell (GDC + Ni GDC LSCF) prepared by this powder has high performance. Hydrogen is the fuel and air is the oxidant. At 700 ℃ and 750 ℃, , The maximum power density was 0.72 W cm-2,0.85 W cm-2, respectively. Compared with the LSCF powder prepared by citrate single complex method under the same conditions, the electrical properties were significantly improved, with the maximum power at 700 ℃ And only 0.22 W cm-2 and 0.46 W cm-2 respectively at 750 ° C.