Binder-free chemical synthesis of ZnFe2O4 thin films for asymmetric supercapacitor with improved performance

作者：Vadiyar Madagonda M; Kolekar Sanjay S^*; Deshpande Nishad G; Chang Jia Yaw^*; Kashale Anil A; Ghule Anil V^*

来源：Ionics, 2017, 23(3): 741-749.

DOI：10.1007/s11581-016-1833-8

• SILAR
• ZnFe2O4
• Nanospheres
• Asymmetric supercapacitor

In this work, a simple, cost-effective, binder-free, and wet chemical successive ionic layer adsorption and reaction (SILAR) method is developed for the growth of ZnFe2O4 thin films on stainless steel substrate. The thin films were characterized using X-ray diffraction, scanning electron microscope, BET surface area analyzer, X-ray photoelectron spectroscopy, and electrochemical analyzer. The synthesized ZnFe2O4 thin films show excellent electrochemical properties by delivering maximum specific capacitance of 615 F g(-1) at 3 mA cm(-2) current density. The porous ZnFe2O4 thin film (SS/ZnFe2O4) is used as a negative electrode in combination with Mn3O4 (Mn3O4/SS, SILAR, positive electrode) for the fabrication of asymmetric supercapacitor device (SS/ZnFe2O4//Mn3O4/SS). The device shows maximum specific capacitance of 81 F g(-1) and delivers a maximum energy density of 28 Wh kg(-1) at 7.97 kW kg(-1) power density with comparable cycle stability showing 74 % capacitance retention over 3000 cycles.

• 出版日期2017-3