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Sulfur-doped graphene (SG) was prepared using an easily controllable electrochemical method, in which graphene oxide (GO) underwent a constant cathodic potential electrolysis in the sulfoureacontaining electrolyte;and consequently GO was partially electrochemically reduced to reduced GO while sulfur element was doped onto the surface of graphene simultaneously.The SG was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy and cydic voltammetry to confirm its successful synthesis.