Electrochimica Acta, Vol.211, 183-192, 2016
Hollow porous carbon spheres with hierarchical nanoarchitecture for application of the high performance supercapacitors
Hollow porous carbon spheres (HPCSs) with micro/mesoporous combination shell and macroporous core are prepared through a facile and efficient hydrothermal method by using silica nanospheres as hard template and furfuryl alcohol (FA) as carbon source. Subsequently, the as-prepared HPCSs are further activated by KOH. The structure, morphology and electrochemical properties of carbon materials are characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectrum, Fourier infrared spectroscopy (FTIR), nitrogen adsorption/desorption isotherm, cyclic voltammetry (CV), galvanostatic charge/discharge tests (GCD), electrochemical impedance spectroscopy (EIS) and cycle life measurements. The results demonstrate that HPCSs possess unique well-balanced hierarchical porous structure with macropores, mesopores and micro-pores combination. Besides, HPCSs own easy-accessibly large surface area and high conductivity, which can result in ultrafast electrolyte ion transport and endow carbon materials outstanding capacitive performance, e.g. a high specific capacitance of 240.0 Fg (1) for the HPCSs-2 electrode at current density of 1 Ag (1). Furthermore, the activated hollow porous carbon spheres (AHPCSs) exhibits a larger specific surface area of 1290 m(2) g (1) and a higher specific capacitance of 303.9 Fg (1) at the same current density, indicating that AHPCSs are a promising electrode material for application of high performance supercapacitor. (C) 2016 Elsevier Ltd. All rights reserved.
Keywords:Hollow porous carbon spheres;Hierarchical porous structure;Activation;Supercapacitor;Supercapacitive performance