Novel synthesis of WSe2-Graphene-TiO2 ternary nanocomposite via ultrasonic technics for high photocatalytic reduction of CO2 into CH3OH

In the present work, we report the development of a WSe2-Graphene-TiO2 ternary nanocomposite via ultrasonic techniques and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The band-gap of the WSe2-Graphene-TiO2 was estimated to be about 1.62 eV which is suitable for photodegradation process under under ultraviolet UV/Visible light irradiation. The photocatalytic potential of nanocomposites is investigated for CO2 reduction to CH3OH. WSe2-G-TiO2 with an optimum loading of graphene of 8 wt% showed the high photoactivity, gaining a total CH3OH yield of 6.3262 µmol g−1 h−1 after 48 h. This excellent photoreduction activity is owing to the progressive synergistic relation between WSe2/TiO2 and graphene components in our heterogeneous system.