Growth of NiCoMn-layered double hydroxides on polyaniline/MXene matrix for high-performance supercapacitor anode materials

NiCoMn-LDH/polyaniline (PANI)/MXene composite materials are prepared via a hydrothermal method. PANI is loaded onto MXene, and NiCoMn-LDH is grown in situ on PANI/MXene. The inherent positive charge in NiCoMn LDH effectively counteracts the self-aggregation tendency of MXene nanosheets and promotes the uniform in-situ growth of NiCoMn lactate dehydrogenase on the surface of PANI loaded MXene. Thus, the composite of NiCoMn-LDH/PANI/MXene boasts exceptional interfacial compatibility and an extensive contact area, facilitating seamless electron and ion transport across redox active centers. The NiCoMn-LDH/MXene/PANI electrode demonstrates remarkable performance, achieving the highest specific capacitance of 416.3 F g⁻¹at 0.2 A g⁻¹. Furthermore, it exhibits unparalleled cycling stability, maintaining its capacitance without any decay even after 10,000 cycles at 6 A g⁻¹. In addition, the assembled CNMP-MX-2//AC boasts a substantial specific capacity of 553.1 F g⁻¹at 0.2 A g⁻¹, accompanied by power density of 145.1 Wh·kg⁻¹and an energy density of 161.5 W kg⁻¹, showcasing its exceptional performance capabilities. The capacitance does not decay after 10000 cycles. The excellent electrochemical performance indicates that the NiCoMn LDH/MXene/PANI composites used directly as an electrode serves as an effective strategy for enhancing energy storage.