Hierarchical Fe2O3 nanosheets anchored on CoMn layered double hydroxide nanowires for high-performance supercapacitor

Abstract

The pursuit of enhanced energy storage efficiency has driven the development of hybrid electrode structures. Overcoming the limitations of single-component metal oxides regarding stability and ionic electron mobility, we have engineered a hybrid structure, CoMn-Fe/NF. This structure comprises vertically grown Fe2O3 nanosheets on CoMn layered doubled hydroxide (LDH) nanowires anchored on nickel foam (NF) via a hydrothermal synthesis method. This hybrid configuration demonstrated a remarkable specific capacitance of 2633F g−1 at 1 A/g, coupled with exceptional stability. When integrated into a supercapacitor device, it achieved a high energy density of 87.80 Wh kg−1 at a power density of 0.245 kW kg−1 while maintaining outstanding cycling performance. The interconnected network of nanowires and nanosheets in CoMn-Fe/NF facilitated ion mobility and provided abundant accessible active sites, resulting in robust electrochemical activity, low resistance, and enhanced supercapacitor performance. This study introduces an innovative strategy for synthesizing electrode materials with significant potential for high-performance hybrid supercapacitors, representing a substantial advancement in the development of efficient energy storage devices. © 2024 Elsevier B.V.