A self-supported hierarchical Co-MOF as a supercapacitor electrode with ultrahigh areal capacitance and excellent rate performance

Hierarchical Co-MOF nanosheet-assembled hexagon-like microblocks serving as a supercapacitor electrode exhibits outstanding areal specific capacitance and Co-MOF/NF//AC achieves a high energy density of 1.7 mW h cm −2 at 4.0 mW cm −2 .