Ordered mesoporous carbon CMK-8 cathodes for high-power and long-cycle life sodium hybrid capacitors

Electrochemical energy storage (EES) devices with simultaneous high energy and high power output are critical in next-generation smart applications. Sodium hybrid capacitors (NHCs) are relatively new devices integrating the functions of batteries and capacitors. Research on capacitor-type carbon electrodes in NHCs is necessary to improve the energy-power behavior. Herein, we study ordered mesoporous carbon (OMC) materials synthesized at different temperatures (600 degrees C, 750 degrees C, and 900 degrees C) utilizing the KIT-6 silica template applied as adsorption cathodes for NHCs, paired with the superionic conductor Na3V2(PO4)(3) as the anode material. Raman measurement indicates that the degree of graphitization is maximized at 750 degrees C. As a result, the OMC carbonized at 750 degrees C delivered the best performance among three OMCs, with a high energy density (54 W h kg(-1)), high power (2200 W kg(-1)) and superior stability (5000 cycles). The current research demonstrates a new platform for utilizing OMCs as adsorption electrodes in NHCs to realize a high-energy, high-power, and highly stable storage devices. (c) 2018 Elsevier B.V. All rights reserved.