摘要
Here, we demonstrate the successful synthesis of (1T/2H) MoS 2 /α-MoO 3 heterostructured nanoflowers at a low temperature of 200 °C by a one-step hydrothermal method. By tuning the reaction time under the influence of thiourea and hydrazine hydrate, we established a complete phase-engineered MoS 2 with 1T and 2H phases on the surface of α-MoO 3 . Active sites associated with the phase-engineered (1T/2H) MoS 2 /α-MoO 3 hybrid nanoflowers enable them to exhibit dual roles as a superior dye adsorbent and an electrocatalyst towards the hydrogen evolution reaction. The 2H-rich (1T/2H) MoS 2 /α-MoO 3 hybrid heterostructured nanoflowers prepared at 16 h achieved a high surface area of 37.97 m 2 g -1 , and 97% of the RhB dye with an initial concentration of 47.9 mg L -1 was removed within 10 min through the adsorption process, which is the highest known removal efficiency reported in the literature. As a hydrogen evolution reaction (HER) electrocatalyst in acidic solution, the 1T-rich (1T/2H) MoS 2 /α-MoO 3 hybrid heterostructured nanoflowers prepared at 12 h exhibited a highly efficient catalytic activity by achieving a low overpotential of 232 mV at a current density of 10 mA cm -2 , which is comparable to those of previously reported HER catalysts based on MoS 2 . Moreover, this sample reached a low Tafel slope of 81 mV dec -1 and was stable when operated for more than 1000 cycles.