High-Entropy NiFeCoMnCr Layered Double Hydroxide Nanosheets for Supercapacitors

High-entropy materials have recently emerged as a promising class of functional solids due to their unique structural stability and synergistic effects among multiple constituent elements. In this work, we report the synthesis of high-entropy NiFeCoMnCr-layered double hydroxide (HE-LDH) nanosheets as advanced electrode materials for supercapacitors. The five-component cationic sublattice stabilizes the LDH structure while introducing rich redox-active sites. Structural and compositional characterizations confirm the homogeneous distribution of Ni, Fe, Co, Mn, and Cr within the brucite-like layers. The HE-LDH delivers high specific capacitance (1121 F g^-1 at 10 mV s^-1, or 756 F g^-1 at 2 A/g), outperforming conventional binary or ternary LDHs. The assembled hybrid device delivered an energy density of 41.77 µWh cm^-2 at a power density of 750 µW cm^-2, and 86% capacity retention over 2000 cycles at 5 mA cm^-2. These attributes stem from the high-entropy design, which enhances active site availability and charge transfer efficiency. This work highlights the potential of high-entropy NiFeCoMnCr-LDH as a promising electrode material for next-generation supercapacitors.