Enhanced asymmetric supercapacitor performance via facile construction of Cu-MOF@Co(OH)2 heterostructure.

Integrating metal-organic frameworks (MOFs) with transition hydroxides has the potential to enhance the inadequate electronic conductivity and address the slow diffusion of MOF materials in electrochemical applications. Herein, we synthesized a 2D Cu-MOF and successfully prepared a Cu-MOF@Co(OH) 2 heterostructure using a one-step hydrothermal method on a Co(OH) 2 /NF (nickel foam) substrate. The hybrid Cu-MOF@Co(OH) 2 material exhibits high electrochemical reactivity, resulting in enhanced pseudocapacitor performance, with a specific capacitance of 2039.8 mF cm−2 at a current density of 1.0 mA cm−2. In addition, an asymmetric two-electrode cell was constructed using Cu-MOF@Co(OH) 2 /NF and activated carbon (AC)/NF, exhibiting a specific capacitance of 444.5 mF cm−2 at a current density of 1.0 mA cm−2, and demonstrating decent cycling durability with 90.1 % retention after 2000 cycles. One 2D Cu-MOF with MOF-110 analogs has been obtained and crystallographically characterized. The Cu-MOF@Co(OH) 2 heterostructure acted as asymmetric supercapacitor electrode material, which delivered enhance pseudocapacitor performance. Besides, the asymmetric two-electrode Cu-MOF@Co(OH) 2 //AC devices possessed the good specific capacitance and cycling durability. [Display omitted] • One 2D Cu-MOF with MOF-110 analogs has been synthesized and crystallographically characterized. • The Cu-MOF@Co(OH) 2 hybrid material has been fabricated, characterized and showed enhanced pseudocapacitor performance. • The asymmetric two-electrode Cu-MOF@Co(OH) 2 //AC devices possessed the good specific capacitance and cycling durability. [ABSTRACT FROM AUTHOR]