CuCo₂O₄/NiCo-Metal–Organic\nFramework Nanoflake Arrays for High-Performance Supercapacitors

Abstract

Developing hybrid metal–organic frameworks (MOFs)\nwith ordered\nstructure is significant to obtain promising electrode materials for\nsupercapacitors. Herein, the special electrodes of CuCo₂O₄/NiCo-MOF nanoflake vertical arrays are constructed\non Ni foam by using the CuCo₂O₄ nanorods as\na self-sacrifice template. Because of the multidirectional interconnected\nchannels of spinel CuCo₂O₄, great electrochemical\nactivity of NiCo-MOF, well-arranged morphology, and synergy effect\nat the interface, the resulting CuCo₂O₄/NiCo-MOF\nnanoflakes exhibit remarkable specific capacity (12.81 F/cm² or 1423 F/g at 2 mA/cm²) and excellent rate performance\n(remaining 79.2% at 30 mA/cm²). The asymmetric supercapacitor\nassembled by CuCo₂O₄/NiCo-MOF and an activated\ncarbon electrode shows excellent energy density of 0.48 mWh/cm² at a power density of 1.50 mW/cm². This work inspires\ninsight into exploiting hybrid MOFs with highly aligned arrays for\nenergy storage.