Construction of Hierarchical NiCoP@NiFe‐LDH Nanoflakes Heterostructure for High Energy Asymmetric Supercapacitor

Layered double hydroxides (LDHs) are attractive electrode materials for supercapacitors due to their high theoretical capacitances and adjustable compositions, but also subjected intrinsic poor electrical conductivity easy structure collapse properties. To resolve these intractable issues, LDHs usually integrated with specific surface areas (SSAs) matrixes. Herein, [email protected] nanoflakes array has been successfully grown on nickel foam by a facile phosphorization subsequent hydrothermal process. The hierarchical porous structure, large SSA, as well the strong interfacial reactions between NiFe-LDH conductive NiCoP layer enabled deliver quantities of electroactive sites, fast ion diffusion electron transfer, hence remarkably boosting supercapacitive performance. Therefore, achieved capacitance 2216 F g−1 at 1 A retained 1038 20 g−1, whose rate capability much higher than those electrodes. In addition, is assembled an activated carbon fabricate asymmetric supercapacitor, which displays energy density 57.4 W h kg−1 good cycling stability 88.2 % retention after 5000 cycles. binder-free composed promising use in storage.