Abstract
A facile and effective self-sponsored doping method was introduced via a simple and convenient one-step hydrothermal process. The loose layered and silk-like structure of as-prepared material facilitates hydronium ion diffusion into the outer and inner areas of graphene sheets, which contributes to electric double-layer capacitance, and the anchored functional groups containing N and S greatly enhance pseudocapacitance. The field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, and electrochemical workstation are used to characterize the materials. The as-produced material shows superior specific capacitance of 302.2 F g−1 at a scan rate of 5 mV s−1 and excellent electrochemical stability with 94 % of its initial capacitance retained after 1000 charge/discharge cycles at the current density of 10 A g−1.
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