Rational design of Cu-doped Co3O4@carbon nanocomposite and agriculture crop-waste derived activated carbon for high-performance hybrid supercapacitors

Development of structurally stable transition metal-oxides and cost-effective biomass-based carbon materials have attracted considerable attention in the fabrication of hybrid supercapacitors. In this work, we designed spinal copper-doped cobalt oxide (Cu-Co3O4) nanoboxes decorated functionalized-carbon nanotubes (f-CNTs) as hybrid redox-type material and agriculture crop-waste derived mesoporous acti-vated carbon as capacitive-type electrode for high-performance hybrid supercapacitors. Structural prop-erties reveal that the Cu-Co3O4 has a cubic spinel structure and Raman spectra results confirm the presence of f-CNTs. The hybrid composite material demonstrates superior redox behavior with excellent structural durability. The hybrid electrodes exhibit maximum specific capacity of 130.7 mAh g(-1) at 0.5 A g(-1) with 86.7 % capacitance retention over 10,000 cycles. Besides, the crop waste-derived activated car-bon demonstrates high surface area (1549 m2g(-1)), mesoporous characteristics and excellent capacitive behavior. The high voltage hybrid supercapacitor is further fabricated with Cu-Co3O4 @F-CNTs as battery-type and biomass-derived activated carbon as capacitive-type electrodes, which demonstrate high energy density of 30.8 Wh kg-1 at 5972 W kg(-1) power density. The augmented results indicate that the hybrid composites with biomass-derived carbon materials pave the way for design of eco-friendly energy storage applications. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Automated summary

In this study, spinal copper-doped cobalt oxide nanoboxes decorated functionalized-carbon nanotubes and agriculture crop-waste derived mesoporous activated carbon were used as materials for hybrid supercapacitors. The hybrid composite material showed superior redox behavior and structural durability. The hybrid electrodes exhibited excellent capacitance retention over 10,000 cycles. Crop waste-derived activated carbon demonstrated high surface area and excellent capacitive behavior. A high voltage hybrid supercapacitor with high energy density was successfully fabricated.