Flexible supercapacitors based on carbon fiber cloth coated copper hexacyanoferrate nanoparticles as positive electrode material

Abstract

Herein, we report fabrication of a new electrode material based on copper(II) hexacyanoferrate(II) nanoparticles coated on flexible and light weight carbon fiber cloth (CuHCF-NPs@CC) for supercapacitors application. Uniform spherical CuHCF-NPs are successfully synthesized through a simple chemical co-precipitation technique at ambient temperature. The CuHCF-NPs were physically examined by different characterizations, for example, FT-IR, UV–Visible, Raman, XRD, XPS, FE-SEM, EDAX and TEM. The CuHCF-NPs@CC is an excellent electrode material that has an open framework structure that can accommodate a wide variety of ions. The electrochemical characteristics of pseudocapacitive behavior of the material were characterized by cyclic voltammogram (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) on two different electrolytes such as K2SO4 and Na2SO4. The CuHCF-NPs@CC exhibits a good reversible cycle in the range of 0 to 0.9 V and excellent charge-discharge performance with a specific capacity of 42.96C g−1 and 24.2C g−1 at 0.2 A g−1 of current density in K2SO4 and Na2SO4 electrolyte, respectively. The low cost, simple preparation methodology, and an outstanding electrochemical behavior of CuHCF-NPs@CC considering a viable candidate for the future energy storage system.