Unusual energy storage and charge retention in Co-based metal–organic-frameworks

► Doctor bladed Co-MOF film on ITO plate. ► Pseudo capacitor behavior in LiOH electrolyte. ► Specific capacitance up to 206.76 F g −1 . ► Loss of only 1.5% in capacitance for 1000 electrochemical life cycle test. In this communication, we explore the cobalt based metal–organic-frameworks (Co-MOF) as a promising material for supercapacitors. The doctor bladed Co-MOF film exhibits a good pseudocapacitor behavior with the specific capacitance up to 206.76 F g −1 . The electrochemical redox switching is reversible perfectly for a long run which leads to the loss of only 1.5% in capacitance for 1000 electrochemical life cycle stability test.