Hierarchical Design of Metal Chalcogenide Oriented Cu@Bi–Zn–Se and Biomass‐Derived Carbon for High Performance Battery‐Type Hybrid Energy Storage Device

ABSTRACT The intelligent design of highly electrochemically active materials to achieve superior energy and power densities is always critical for energy storage systems. Herein, a novel strategy is developed to design unique metal chalcogenides (Bi–Zn–Se). A hierarchical design of chalcogenide adorned with coral reef‐like copper structures via electrodeposition is directly used as the positive supercapacitor electrode. Moreover, biomass‐derived hollow carbon structures synthesized via pyrolyzation are employed as a negative electrode in the hybrid device. The hierarchical architecture of both positive and negative electrodes, coupled with strong electroactivity and simple electrolyte permeation, results in significantly increased electrochemical performance, with specific capacitances of 230 F g −1 at a current density of 1 A g −1 . The assembled Cu@Bi–Zn–Se//C battery‐type device delivers superior energy density of 85.2 Wh kg −1 and outstanding power density of 817.92 W kg −1 . Overall, creating heterostructures by combining electro‐active materials was a fruitful approach to producing a high‐performance battery‐type hybrid energy storage device.