Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, Roskilde, DK-4000, Denmark.
Nanotechnology. 2017 Jun 30;28(26):265402. doi: 10.1088/1361-6528/aa73a6. Epub 2017 May 17.
Design of three-dimensional metal oxide nanofibers by electrospinning is being widely explored. However, the impacts of calcination and sintering on the resulting morphology remain unknown. For the first time, (LaSr)CoO (LSC) nanofiber, which is among the most promising electrode materials for solid oxide fuel cells, was synthesized by sol-gel electrospinning. By elevating the temperature in oxygen using in situ transmission electron microscopy, we discovered the structural transitions from nanofibers to nanotubes and then to nano-pearl strings. This facile and up-scalable method can be widely applied to design metal oxide one-dimensional nanomaterials with precise control in both geometry (nanofiber, nanotube and nano-pearl string) and surface area (by varying grain size).
通过静电纺丝设计三维金属氧化物纳米纤维正在被广泛探索。然而，煅烧和烧结对所得形态的影响尚不清楚。首次通过溶胶-凝胶静电纺丝合成了（LaSr）CoO（LSC）纳米纤维，它是最有前途的固体氧化物燃料电池电极材料之一。通过原位透射电子显微镜在氧气中升高温度，我们发现结构从纳米纤维转变为纳米管，然后转变为纳米珍珠串。这种简单且可扩展的方法可以广泛应用于设计具有精确几何形状（纳米纤维、纳米管和纳米珍珠串）和表面积（通过改变晶粒尺寸）控制的金属氧化物一维纳米材料。
