Search

A series of identical hybrid structural Cu-MOFs with various morphologies have been synthesized under diverse conditions, including reaction solvents, surfactants and concentrations. The Cu-MOFs have been characterized by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). Electrochemical performances of the as-synthesized materials have been evaluated through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS) and endurance-life tests. The results indicate that the slender rod shaped Cu-MOF E shows a high performance of 802 ​F ​g−1 at 0.5 ​A ​g−1 and no attenuation over 2000 GCD cycles. To promote the electrochemical performance, the flower-like Cu-MOF SDS has been obtained by using the selected sodium dodecyl sulfate. Then, the capacitive performance enhancement of Cu-MOF SDS has achieved approvingly, and the highest specific capacitance is 851 ​F ​g−1 at 0.5 ​A ​g−1. In this work, the solvents, surfactants and concentrations would be generating energetic effects on the morphological modulation and supercapacitive performances. A series of rGOs with different morphologies have been synthesized through modulating solvents, surfactants and concentrations. The slender rod shaped rGO E (synthesized in ethanol) shows a high performance of 802 ​F ​g−1 at 0.5 ​A ​g−1 and no attenuation in capacitance over 2000 GCD cycles. To improve the electrochemical performance, the sodium dodecyl sulfate (SDS) was added in the reaction and flower-like rGO SDS was obtained. Then, the capacitive performance enhancement of Cu-MOF SDS has been achieved approvingly, and the highest specific capacitance of 851 ​F ​g−1 at the current density of 0.5 ​A ​g−1. Further, the mechanism of this work has been explored elaborately. Image 1 [ABSTRACT FROM AUTHOR]

Two novel coordination polymers, namely, [Ca(NCP) 2 ] ∞ ( I ) and [Sr(NCP) 2 ] ∞ ( II ) were synthesized under hydrothermal conditions based on 2-(4-carboxyphenyl)imidazo(4,5-f)-(1,10)phenanthroline (HNCP) and characterized by elemental analysis, infrared spectrometry, X-ray powder diffraction and single crystal X-ray diffraction. Findings indicate that I and II are isomorphous and isostructural, containing the unit of M(NCP − ) 4 (M=Ca(II) and Sr(II)), based on which to assemble into three-dimensional (3D) porous 4-fold interpenetration honeycomb-shaped neutral coordination polymers (CPs). Between the adjacent lamellar structures in I and II , there exist π–π interactions between the pyridine rings belonging to phenanthroline of NCP − which stabilize the frameworks. Both I and II display stronger fluorescence emissions as well as high thermal stability. [ABSTRACT FROM AUTHOR]