Ultra-high-performance zinc-ion supercapacitor based on single-copper molybdate urchins
Sammar Min Allah, Muhammad Kashif Aslam, Iftikhar Hussaın, Fathy M. Hassan, Ali H. Al‐Marzouqi, Maowen Xu
Abstract
Lithium-ion (Li-ion) and sodium-ion (Na-ion) hybrid supercapacitors have emerged as promising energy storage systems, offering a balance between high power and energy density. However, their practical implementation is constrained by safety concerns and high production costs. Zinc-ion hybrid supercapacitors (ZHSCs) have gained significant attention as a viable alternative due to their intrinsic safety, cost-effectiveness, and natural abundance. Herein, we report the successful synthesis of urchin-like copper molybdate on carbon cloth (CuMoO 4 /CC) as a high-performance electrode material for ZHSCs. The CuMoO 4 /CC electrode exhibited an exceptional specific capacitance of 2200 F g −1 at 1 A g −1 in a three-electrode configuration, demonstrating excellent charge storage capability. When assembled an aqueous ZHSC, the CuMoO 4 /CC electrode achieved excellent specific capacitance of 560 F g −1 at 1 A g −1 , remarkable energy density of 263.8 Wh kg −1 and a power density of 998 W kg −1 . Furthermore, a flexible quasi-solid-state ZHSC based on CuMoO 4 /CC employing a gel electrolyte was also studied and it delivered superior specific capacitance of 390 F g −1 at 1 A g −1 , a high energy density of 195 Wh kg −1 at a power density of 875 W kg −1 , all these findings underscoring its potential for next-generation flexible energy storage applications. These findings provide valuable insights into the development of high-performance ZHSCs, paving the way for their practical implementation in advanced energy storage technologies.