Abstract
The hollow nanofibers of Ce0.8Gd0.2O2−δ(GDC20) were electrospun from the PVP and nitrate precursors. The evolution of hollow channel was investigated by TG-DTA and ex situ TEM for the fibers heated at 250–300°C for 1–5 h. The hollow cores were revealed during the crystallization of nano-GDC20 and the PVP decomposition stage. The structural and morphological properties of GDC20 fibers before and after being calcined at 500–900°C for 8 h were investigated by FTIR, FE-SEM, TEM, EDS, XRD, and Raman spectroscopy. The results from XRD and Raman scattering verify the successful doping of Gd3+ions into the CeO2host lattice. The conductivity of the cold-pressed GDC 20 pellet sintered at 1400°C is more than 0.01 S/cm at and above 600°C.
Highlights
Cerium oxide (CeO2) has drawn much attention because of its wide spectrum of applications such as components in a solid oxide fuel cell (SOFC), an oxygen sensor, an exhaust catalyst [1,2,3,4], and so forth
The crystal structure and crystallinity of calcined nanofibers were analyzed using X-ray diffraction techniques (XRD, PANalytical, The Netherlands) and selected-area electron diffraction- (SEAD-) Transmission Electron Microscopy (TEM)
The hollow nanofibers of Ce0.8Gd0.2O2−δ were directly fabricated by an electrospinning technique
Summary
Cerium oxide (CeO2) has drawn much attention because of its wide spectrum of applications such as components in a solid oxide fuel cell (SOFC), an oxygen sensor, an exhaust catalyst [1,2,3,4], and so forth. The derived nanofibers have large surface areas which offer the great number of active sites for catalytic reactions to occur. For this reason, including GDC nanofibers in the SOFC electrodes can enhance the SOFC performance because numerous open channels created among the overlaid fibers can give pathways for a gas flux to reach reaction sites. The absence of material at the center of electrospun nanofibers can be induced by removing the sacrificial core layer such as oil [16, 17] It is possible for the virgin cerium oxide nanofibers to be prepared without the use of any sacrificial layer as previously proposed by Qizheng et al [18]. According to our literature reviews, GDC nanofibers are rarely investigated for their electrical properties so the temperature-dependent conductivity measurement was carried out using an acimpedance technique as well
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