静电纺丝法制备中温固体氧化物燃料电池阴极用纳米La_(0.6)Sr_(0.4)Co_(0.4)Fe_(0.6)O_3纤维

Intermediate Temperature Solid Oxide Fuel Cell Nano Cathode La_(0.6)Sr_(0.4)Co_(0.4)Fe_(0.6)O_3 Fibers Fabricated by Electrospinning

采用静电纺丝技术和溶胶–凝胶法制备了聚乙烯吡咯烷酮(polyvinylpyrrolidone,PVP)/La0.6Sr0.4Co0.4Fe0.6O3(LSCF)复合纳米纤维,经过不同温度煅烧处理,获得了具有单晶结构的LSCF纳米纤维,并对纤维样品的煅烧过程、形貌、物相、结构以及电性能进行了表征。结果表明:PVP/LSCF复合纳米纤维中的水分和有机物在达到560℃前已经完全挥发和分解。经煅烧处理,可获得具有斜方六面体结构LSCF。经800℃煅烧后的LSCF纳米纤维的直径主要分布在130～240nm;以LSCF纳米纤维为阴极制备的单电池在750℃工作温度下,其最大功率密度为1.18W/cm2。与用传统溶胶–凝胶法在相同条件下制得的LSCF粉体相比,其单电池的电流–电压–功率性能有显著提高。

Polyvinylpyrrolidone （PVP）/La0.6Sr0.4Co0.4Fe0.6O3（LSCF） composite nanofibers were fabricated via electrospinning technique and sol–gel process. Single crystal LSCF nanofibers were prepared after the composite fibers calcined at different temperatures. And the morphology, phases, structure, heat treatment and electrical property of the nanofibers were characterized. The results show that moisture and organic matter in PVP/LSCF composite fiber had volatilized and decomposed completely while the temperature was 560 ℃. LSCF nanofibers can be prepared from PVP/LSCF composite fibers with rhombohedral structure by the calcined processing. The LSCF nanofiers have a uniform diameter of 130–240 nm after calcined at 800 ℃. The single cell with LSCF nanofiers as cathode had good electrical property. The maximum power density of the single cell with nano LSCF fiber as cathode at 750 ℃ were 1.18 W/cm^2. The electrical property of the fibers is better than that of the LSCF powders prepared by traditional sol–gel method.