A Novel Strategy Synthesized Highly Specific Surface Area Bimetallic CoMn-MOFs as Electrode Materials for Supercapacitors
摘要
Supercapacitors are promising energy storage devices owing to their exceptional power density, rapid charge/discharge capabilities, and outstanding cycling stability. Nevertheless, their limited capacitance restricts practical applications. We developed CoMn-MOF nanorod electrodes via an in-situ etching strategy using metal-organic frameworks (MOFs) as templates. The unique in-situ modification approach effectively constructs nanorod structures with substantially enlarged specific surface area, which significantly enhances the electrode-electrolyte interaction and charge transfer efficiency. The optimized CoMn-MOF-15 electrode demonstrates remarkable performance, delivering a high specific capacity of 189.3 C g−1 at 1 A g−1, while the energy density of the constructed asymmetric supercapacitor with activated carbon (CoMn-MOF-15//AC) achieves up to 124.1 Wh kg− 1 at a power density of 584.0 W kg− 1. In addition, the constructed material maintain excellent cycling stability with 76.38% capacitance retention after 5000 charge/discharge cycles. The practical viability of this system is demonstrated by its ability to power commercial LED indicators. These findings underscore the great potential of bimetallic MOF-derived materials as advanced electrode platforms for next-generation energy storage applications.