水相剥离法制备二维TMDs纳米片作为HER催化剂

novel liquid system composed of water and the cheap and green surfactant SDBS (sodium dodecyl benzene sulfonate) is developed to exfoliate MoS2 bulk into MoS2 nanosheets with the aid of ultrasonication. The as-prepared dispersion of MoS2 nanosheets has good dispersion stability, and high electrocatalytic activity in hydrogen evolution reaction (HER). The results reveal that with the increase of centrifugal speeds, the number of layers of MoS2 nanosheets is decreasing, and the electrocatalytic activity of HER is increasing. At 4000 rpm centrifugal speed, the as-prepared of MoS2 is bilayer, and low onset overpotential and tafel slope were 0.524V and 143 mV/dec, respectively. The proposed liquid-phase system is not limited to exfoliate MoS2 but also used to exfoliate other TMDs (transition metal dichalcogenides), such as WS2. The as-prepared of WS2 nanosheets of onset overpotential and tafel slope were 0.381V and 128 mV/dec, respectively.