Inorganic Chemistry, Vol.58, No.4, 2856-2864, 2019
Temperature-Dependent Morphologies of Precursors: Metal-Organic Framework-Derived Porous Carbon for High-Performance Electrochemical Double-Layer Capacitors
In this work, three Cu metal-organic framework samples with tunable rhombic, squama, and trucated bipyramid morphologies have been synthesized at 0, 25, and 60 degrees C, respectively, and further employed as precursors to initially prepare CupC composites by the calcination-thermolysis procedure. Then Cu@C composites have been etched with HCl and subsequently activated with KOH to obtain activated porous carbon (APC-0, -25, and -60). Interestingly, APC-25 presents a loose multilevel morphology of cabbage and possesses the largest specific surface area (1880.4 m(2) g(-1)) and pore volume (0.81 cm(3) g(-1)) among these APC materials. Consequently, APC-25 also exhibits the highest specific capacitance of 196 F g(-1) at 0.5 A g(-1), and the corresponding symmetric supercapacitor cell (SSC) achieves a remarkable energy density of 11.8 Wh kg(-1) at a power density of 350 W kg(-1). Furthermore, APC-25 shows excellent cycling stability, and the loss of capacitance is only 7.7% even after 10000 cycles at 1 A g(-1). Significantly, five light-emitting diodes can be lit by six SSCs, which proves that APC-25 can be used in energy storage devices.