A copper based metal-organic framework as single source for the synthesis of electrode materials for high-performance supercapacitors and glucose sensing applications

The article describes the conversion of MOF-199 to Cu–Cu 2 O–CuO/C 700 ( 1 ) and Cu–Cu 2 O–CuO/C 800 ( 2 ) nanostructures by simple pyrolysis at 700 and 800 °C under inert atmosphere. The X-ray photoelectron spectroscopy analysis reveals that the nanostructures Cu–Cu 2 O–CuO/C consist of graphitic carbon functionalized with carboxylic, carbonyl and hydroxyl functional groups with copper/copper oxide particles on surfaces. The electrochemical properties of 1 and 2 are evaluated as electrode material for supercapacitors using cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The results for the capacitive performance from cyclic voltammetry and galvanostatic charge/discharge reveal that both the samples have gravimetric capacitance greater than 750 F g −1 at a scan rate of 2 mV s −1 and current density of 2 mA cm −2 . The samples retain about 43% of their initial capacitance even at high scan rate of 75 mV s −1 . The cycling performance of the nanostructures illustrate that there is 5.5% capacitance loss after 3000 cycles. The sample 1 and 2 are washed with 1 mol L −1 HCl solution to obtain copper oxide free materials Cu/C 700 ( 3 ) and Cu/C 800 ( 4 ). Samples 3 and 4 are tested as electrocatalysts for glucose sensing and the cyclic voltammetry measurement shows enhanced current densities compared to the literature values.