One-pot construction of highly oriented Co-MOF nanoneedle arrays on Co foam for high-performance supercapacitor

Highly oriented Co-MOF nanoneedle arrays are in situ constructed on Co foam (Co-MOF@Co) by using a one-pot solvothermal strategy. As-prepared Co-MOF@Co can be directly served as a binder-free electrode for supercapacitor, which exhibits wonderful electrochemical performances, i.e. high specific capacitance (12783.0 mF cm(-2) or 1164.2 F g(-1)), exceptional cycling stability (90.5% retention over 10 000 cycles at 250 mA cm(-2)) with a loading of 10.98 mg cm(-2). Meanwhile, an asymmetric supercapacitor of AC//Co-MOF@Co delivers a high ratability (87% retention upon ten-fold current density) and high energy density of 43.4 W h kg(-1) at the power density of 145.1 W kg(-1).

Automated summary

Highly oriented Co-MOF nanoneedle arrays (Co-MOF@Co) were in situ constructed on Co foam using a one-pot solvothermal strategy, which can serve as a binder-free electrode for supercapacitors with excellent electrochemical performances and cycling stability. The asymmetric supercapacitor of AC//Co-MOF@Co shows high rate capability and energy density under different current densities.