Low cost flexible 3-D aligned and cross-linked efficient ZnFe sub(2)O sub(4) nano-flakes electrode on stainless steel mesh for asymmetric supercapacitors

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 4; no. 9; pp. 3504 - 3512
• Main Authors: Vadiyar, Madagonda M, Bhise, Sagar C, Kolekar, Sanjay S, Chang, Jia-Yaw, Ghule, Kaustubh S, Ghule, Anil V
• Format: Journal Article
• Language: English
• Published: 01.02.2016
• Subjects: Asymmetry; Capacitance; Capacitors; Crosslinking; Nanostructure; Stainless steels; Supercapacitors; Three dimensional
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c5ta09022a

A simple and economic approach for growth of 3-D aligned and cross-linked ZnFe sub(2)O sub(4) nano-flakes on a flexible stainless steel mesh (FSSM) substrate (300 mesh) using a rotational chemical bath deposition technique for fabricating efficient asymmetric supercapacitors is reported. The prepared ZnFe sub(2)O sub(4) nano-flake thin film (ZnFe sub(2)O sub(4)/FSSM-300) as an anode in combination with Ni(OH) sub(2)/FSSM-300 as a cathode was used as an asymmetric supercapacitor. Furthermore, ZnFe sub(2)O sub(4) nano-flakes were also grown on FSSM with a different mesh and designated as ZnFe sub(2)O sub(4)/FSSM-200, ZnFe sub(2)O sub(4)/FSSM-250 and ZnFe sub(2)O sub(4)/FSSM-300 for investigating the effect of mesh size on the morphology formation and their electrochemical performance. Amongst the samples, ZnFe sub(2)O sub(4)/FSSM-300 exhibited excellent supercapacitive properties, such as a higher specific capacitance (1625 F g super(-1) at 1 mA cm super(-2)) and excellent cycle stability (8000 cycles, 97% retention), which was marginally higher than ZnFe sub(2)O sub(4)/FSSM-250 (545 F g super(-1) at 1 mA cm super(-2), 70% retention), ZnFe sub(2)O sub(4)/FSSM-200 (241 F g super(-1) at 1 mA cm super(-2), 56% retention) and other earlier reported ferrites. In addition, the fabricated asymmetric pseudocapacitor device delivered better performance with high specific capacitance (118 F g super(-1) at 5 mA cm super(-2)), excellent cycle stability (8000 cycles, 83% capacitance retention) and high energy density (42 W h kg super(-1)) even at higher power density (5 kW kg super(-1)).