<p>High energy density and long-term-stability electrode materials design is still one of the most important challenges of next generation electrochemical energy storage systems. In this work, a highly efficient MoS₂-Ag₂S composite electrode is synthesized by a simple method with excellent performance of supercapacitors. The synergy of MoS₂ with Ag₂S helps to increase the electrical conductivity, give plenty of electroactive sites and increase the rate of charge transfer kinetics. In a three-electrode setup, the optimized MoS₂-Ag₂S electrode delivers a remarkable specific capacitance of 700 F g⁻¹. The specific capacitance of the device is 121 F g⁻¹ at 1 A g⁻¹ in a two-electrode asymmetric supercapacitor configuration, while the energy density and power density are 43 Wh kg⁻¹ and 3960 W kg⁻¹, respectively. Notably, it displays an outstanding cycling stability, with 86% of the initial capacity after 10,000 charge–discharge cycles at 9 A g⁻¹. The superior performance is believed to be due to the efficient interfacial interactions between MoS₂ and Ag₂S enabling fast ion diffusion and electron transport and the low internal resistance. The authors propose a simple route toward high performance asymmetric supercapacitor, where MoS₂-Ag₂S is a viable material for practical applications of energy storage.</p>