Synthesis of high-performance CdS/MnO composite electrode to achieve high energy and power densities for asymmetrical supercapacitors

Abstract

Developing electrode materials with exceptional durability, energy density, and rate performance is very interesting for next-generation supercapacitor applications. This work used a simple wet chemical method to synthesize a cost-effective composite electrode based on CdS and MnO to achieve high energy and power densities of asymmetric supercapacitors (ASCs). The composite shows excellent conductivity, a large specific surface area, and high cycling stability. It exhibits remarkable rate capability by achieving a specific capacitance of 1020 F/g at 1 A g⁻¹ and maintaining 90.3% capacitance after 5000 cycles at 10 A/g. Integrated into a CdS-MnO||AC ASC, the device exhibits outstanding overall energy and power capabilities by delivering a high energy density and maintaining a stable performance at high power densities. The components’ synergistic interaction significantly improves the supercapacitor’s performance, providing a capable method for enhancing energy storage systems.