Porous carbon nanosheets derived from Al-based MOFs for supercapacitors

In this work, we report preparation of porous carbon nanosheets (CNs) through carbonization of an Al-based metal-organic frameworks (DUT-5) at 700 degrees C under an inert gas atmosphere. The obtained CNs shows a two-dimensional (2D) nanostructure, with a high BET surface area (415.2 m(2) g(-1)) and pore volume (0.99 cm(3) g(-1)). The electrochemical performance of the as-synthesized CNs was evaluated in a three-electrode configuration with 6 M KOH electrolyte. The capacitance values are calculated to be 119, 100, 88, 84 and 80 F g(-1), respectively, at current densities of 0.25, 0.5, 1, 2 and 3 A g(-1). Finally, the symmetric supercapacitors (SCs) were fabricated by utilizing the CNs as the positive and negative electrode. The working voltage of the SCs can be extended to 1.5 V in 6 M KOH and achieved an energy density up to 3.0 Wh kg(-1) at a power density of 1384 W kg(-1), indicating the potential of assembled system in practical application. (C) 2016 Elsevier Inc. All rights reserved.