Synthesis and characterization of mesoporous crystalline copper metal–organic frameworks for electrochemical energy storage application

Abstract

The mesoporous nanostructure Cu-metal organic frameworks (Cu-MOF-1 and Cu-MOF-2) have been synthesized by a high temperature solvothermal route. The products were characterized by X-ray diffraction, Brunauer-Emmett-Teller surface measurement, Thermo gravimetric analysis, scanning electron microscope and Single crystal XRD. The electrochemical properties of these MOF electrodes were examined by using of cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopic techniques. Comparing the results of CV and GCD studies, both those MOFs have shown significant charge storage capacity, while Cu-MOF-2 has showed a specific capacitance greater than Cu-MOF-1. The Cu-MOF-1 and Cu-MOF-2 electrodes showed a maximum specified capacity of 181 and 248 F g −1 respectively at a current density of 1 A g −1 and an extensive cyclic stability of up to 2000 cycles with capacity retention of ~ 90.1%. The electrochemical studies with Cu-MOF electrodes were conducted in 6 M KOH electrolytes. The excellent electrochemical properties of Cu-MOFs can be credited to the large surface area with a high microporous volume of structurally implanted electro-active metallic centres and the rapid transport of ions into electrolytes/electrodes. The results imply that the Cu-MOFs electrode could be the potentially high-performance electrode materials for super capacitor applications.

Acoustotemplating: rapid synthesis of freestanding quasi-2D MOF/graphene oxide heterostructures for supercapacitor applications

“…The templated growth of the MOFs onto the GO sheets in the acoustically-synthesized q-2D-MOF/rGO composites are anticipated to facilitate efficient electron and ion migration across the composite even without necessitating the addition of conductive polymers (such as PEDOT:PSS) or the impregnation of the composite within an expensive conductive scaffold. 31,37 To verify this assertion, we evaluated its electrochemical performance through cyclic voltammetry (CV), galvanic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) using a three-electrode configuration in aqueous 1 M H 2 SO 4 electrolyte. An acidic electrolyte was favoured over neutral (Na 2 SO 4 ) and basic (KOH) electrolytes (Fig.…”

“…Due to the incompatibility in the morphologies between the twodimensional (2D) GO sheets and the three-dimensional (3D) conventional MOF crystals, distribution inhomogeneities in the MOF and GO or rGO is common, resulting in sub-optimal performance of the composite material. To overcome this limitation, conductive scaffolds such as nickel foam, or highlyconducting polymeric binders such as poly (3,4ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), are oen employed to compensate for the heterogeneity of the composite material, [31][32][33][34][35][36][37] but at the expense of increasing cost and production complexity. To our best knowledge, conductive binders have always been incorporated into MOF/GO or MOF/ rGO composites, without which the capacitive performance is at least ten-fold lower.…”

Exploring Ligand-Controlled C2 Product Selectivity in Carbon Dioxide Reduction with Copper Metal–Organic Framework Nanosheets

“…Therefore, every unit has two Cu(II) atoms with deformed octahedral geometries (Scheme 1). 72,73 The attenuated total reflectance infrared (ATR-IR) spectrum of Cu-UNDC and Cu-UBDC exhibited peaks at 1384 and 1394 cm −1 , respectively, for the bridging COO − group (Figure S2a). 74 The positive shift (9 cm −1 ) of the carboxylate peak in Cu-UNDC compared to Cu-UBDC can be explained by the change in the electron density around the metal center (Figure S2b).…”