High‐Entropy NiFeCoMnCr Layered Double Hydroxide Nanosheets for Supercapacitors

ABSTRACT 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.