固体氧化物燃料电池阴极材料LSCF纳米纤维的静电纺丝法制备

Preparation of LSCF Nanofiber of Solid Oxide Fuel Cell Cathode Material by Electrospinning Method

采用溶胶–凝胶–静电纺丝法制备了La0.6Sr0.4Co0.2Fe0.8O3–δ（LSCF）纳米纤维。分析了LSCF纳米纤维的结构和形貌。结果表明：所制备的LSCF纳米纤维为内部微晶排列有序、均匀的多晶纤维,纤维直径约为200nm,长度分布为10～30μm,经1100℃煅烧后仍然保持纤维状。以LSCF纤维作为阴极,制备了固体氧化物燃料电池（SOFC）纽扣电池（GDC＋NiO║GDC║LSCF）及其阴极对称电池（LSCE║GDC║LSCF）。单电池的阴极阻抗和电化学性能测试表明,LSCF纳米纤维阴极具有较高的电化学活性和较低的极化阻抗,以氢气为燃料、空气为氧化剂,在650和700℃工作温度下,单电池的最大功率密度分别为0.82和1.07W/cm2;在工作温度分别为600、650、700和750℃下,其阻抗分别为1.09、0.78、0.32和0.11·cm2。

The La0.6Sr0.4Co0.2Fe0.8O3-δ（LSCF） nanofiber was prepared by sol-gel and electrospinning methods. The microstructure and morphology of the LSCF nanofibers were analyzed. The results show that the LSCF nanofibers prepared is an internal microcrys-talline uniform orderly arranged polycrystalline fiber, the LSCF nanofiber is 200 nm in diameter and 10-30μm in length, and it re-mains fibrous after calcined at 1 100℃. The button solid oxide fuel cell （SOFC）（GDC＋NiO║GDC║LSCF） and the symmetric cell （LSCE║GDC║LSCF） with LSCF nanofiber cathode were prepared using the LSCF nanofiber as a cathode material. The cathode impedance and electrochemical performance of single battery were examined. The results indicate that the LSCF nanofiber cathode has a high electrochemical activity and a low polarization impedance. Using H2 as fuel and air as oxidizing atmospheres, we can ob-tain the maximum power density of the cell of 0.82 and 1.07 W/cm2 at operating temperature of 650℃ and 700℃, respectively. The impedance of the LSCF cathode is 1.09, 0.78, 0.32 and 0.11？·cm2 at 600, 650, 700 and 750℃, respectively.