MoSe2/graphite composite with excellent hydrogen evolution reaction performance fabricated by rapid selenization method

MoSe2/graphite composite was fabricated by rapid selenization method for the hydrogen evolution reaction (HER) application. The microstructure, surface composition and HER performance of MoSe2/graphite composite were evaluated by scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and linear sweep voltammetry. The results indicate that the internal and external surface of graphite substrate is covered with MoSe2 nanosheets. The size, number and crystallinity of MoSe2 nanosheets can be controlled by adjusting the selenization parameters to achieve better HER activity of the electrodes. MoSe2/graphite composite prepared at 500 degrees C for 15 min exhibits the best HER activity and great stability in acidic solution with an over potential of -125.8 mV vs reversible hydrogen electrode (RHE) at the cathodic current density of 10 mA cm(-2). The Tafel slope of MoSe2/graphite electrodes is 52.1 mV dec(-1), which shows the best performance among the reported literatures of MoSe2 materials.