Design and development of MWCNT–incorporated CoMoO4 composite for enhanced asymmetric supercapacitor performance
摘要
In this work, pure CoMoO4 and CoMoO4/MWCNT composites were synthesized via a hydrothermal approach and thermal treatment. Incorporation of MWCNTs enhanced conductivity, structural integrity, and surface accessibility, yielding a well-connected porous morphology. Electrochemical investigations revealed that the CoMoO4/MWCNT electrode achieved a high specific capacitance of 1386 F g− 1 at 1 A g− 1, outperforming pure CoMoO4 (613 F g− 1), and 95.1% capacitance sustained up to 5000 cycles. An asymmetric supercapacitor device fabricated with CoMoO4/MWCNT and activated carbon delivered a wide potential window of 1.5 V, achieving a maximum energy density of 43.75 Wh kg− 1 at 750 W kg− 1 and retaining 15.62 Wh kg− 1 at 3750 W kg− 1. Such performance is mainly derived from the synergistic contribution of CoMoO4 and MWCNTs, which ensures multiple redox-active sites, high conductivity, and robust stability over repeated cycles. This study demonstrates a simple route for designing molybdate–carbon hybrids for high-performance supercapacitors.