Designed nanoarchitectonics and fabrication of Ni(OH)2/MWCNT/CNF electrode for asymmetric hybrid supercapacitor applications

Abstract

The creation of ternary composite materials with innovative structures is crucial for enhancing the energy density and stability of supercapacitor devices. In this study, Ni(OH)2-based ternary composites were successfully synthesized using a straightforward hydrothermal method. Comprehensive analyses of structure, morphology, surface area, and binding energy were conducted using powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron microscopy. The electrochemical performance of the Ni(OH)2/MWCNT/CNF electrode displayed a higher specific capacitance of 882 F g−1 and lower resistance compared to pure Ni(OH)2 electrodes. An asymmetric supercapacitor device, assembled with the chosen Ni(OH)2/MWCNT/CNF and activated carbon (AC), exhibited energy and power densities of 47.5 Wh kg−1 and 750 W kg−1, along with 83.42 % capacitance retention after 5000 charge-discharge cycles. These outstanding results confirm the potential of this material as an exceptional electrode for future supercapacitor applications.