High-performance GdxSr1-xNiO3 porous nanofibers prepared by electrospinning for symmetric and asymmetric supercapacitors. (May 2020)

• Record Type: Journal Article
• Authors: Wang, Wei; Lin, Baoping; Cao, Yi; Sun, Ying; Zhang, Xueqin; Yang, Hong; Sun, Hao
• Is Part Of: Journal of physics and chemistry of solids. Volume 140(2020)
• Publication Date: 2020-05
• Subjects: Electrospin -- Gd0.7Sr0.3NiO3 -- Porous nanofibers -- Oxygen vacancy -- Supercapacitor; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2020.109361
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The electrospinning and calcinations were employed to synthesis a series of Gdx Sr1-x NiO3 (x = 0.3, 0.5, 0.7, 0.9, 1) porous nanofibers (GSN-x). In the issue, the morphologies of nanofibers intriguingly changed from tight fibrous (GSN-1 and 0.9) to rough porous (GSN-0.7 and 0.5) fibers and then brambles (GSN-0.3) as the ratio of Sr increased from 0 to 0.7. The obtained GSN-0.7 possesses the prominent performance as an electrode material in supercapacitor application which is positively influenced by the maximal surface area (15.73 m 2 g −1 ) and rational pore diameter (3.68 nm). The GSN-0.7 reveals considerable voltage window (-1-1 V) and better specific capacitances than other GSN-x materials, which reach up to 928.82 F·g −1 in 1 M Na2 SO4 and 764.06 F·g −1 in 1 M KOH at a current density of 1 A·g −1 . In addition, the AC//GSN-0.7 device shows a high energy density of 53.8 Wh·kg −1 and the corresponding power density of 1 kW kg −1 at 1 A g −1, and a high power density of 20 kW kg −1 and the corresponding energy density of 19.4 Wh·kg −1 at 20 A g −1 . Therefore, our study could be of great potential in synthesizing porous perovskite-type oxide nanofibers and electrode materials of supercapacitor. Highlights: Electrospinning and calcinations were used to successfully obtained Gdx Sr1-x NiO3 (x = 0.1–1) nanofibers for the first time. Sr doping in GdNiO3 controls the size of the particles and provides more oxygen vacancy by lattice distortion. The morphologies intriguingly changed from tight fibrous to rough porous fibers and then brambles as Sr increased. GSN-0.7 and AC//GSN-0.7 manifest more excellent properties than other GSN-x and previously reported similar materials. Electrospun and Sr-doping could efficiently form steady perovskite-type oxides nanofibers with excellent conductivity.