Electrodeposition Preparation of NiCo-LDH/NiCoP/CC Electrode and Its Application in Supercapacitors

The NiCo-LDH/NiCoP/CC composite electrode material was successfully synthesized on carbon cloth (CC) via a two-step electrodeposition method and subsequently applied in a flexible asymmetric supercapacitor. The electrode material exhibits excellent electrochemical performance, which is mainly attributed to the synergistic effect between NiCo-LDH and NiCoP. The layered structure of NiCo-LDH provides abundant active sites, while the high electrical conductivity of NiCoP effectively enhances the overall conductivity of the electrode. The synergy between the two not only increases the number of active sites for Faradaic reactions but also optimizes the ion transport pathways, thereby significantly improving the electrochemical performance of the electrode. Owing to this synergistic effect, the electrode maintains efficient charge storage and transfer capability at high current densities, and sustains stable electrochemical performance even during rapid charge–discharge processes. Electrochemical test results show that the NiCo-LDH/NiCoP/CC electrode possesses a high specific capacitance (1682.5 mF cm −2 at a current density of 4.0 mA cm −2 ) and good electrochemical stability (83.9% capacitance retention after 8000 cycles at 8.0 mA cm −2 ). Furthermore, the NiCo-LDH/NiCoP/CC||AC/CC device exhibits excellent cycling life (83.4% retention after 8000 cycles at 4.0 mA cm −2 ), as well as outstanding mechanical stability and flexibility, with a capacitance retention of 97.6% at a bending angle of 180° and 96.7% after 200 bending cycles at 90°. These results demonstrate that the electrode material holds great promise for applications in flexible electronic devices and wearable technology.