Synthesis of mesoporous Nb2O5 photocatalysts with Pt, Au, Cu and NiO cocatalyst for water splitting

Hydrogen production by water splitting was examined over mesoporous niobium oxide photocatalysts, prepared by evaporation-induced self-assembly (EISA) method. A series of Pt, Au, Cu and NiO nanoparticles were loaded as cocatalyst to enhance the photocatalytic activity of mesoporous niobium oxide. The influences of the preparation parameters on the characteristics of the mesoporous niobium oxide photocatalysts and their photocatalytic activities were investigated in detail. The catalysts were characterized by powder X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), N2 sorption and ultraviolet–visible spectroscopy (UV–vis) and nitrogen adsorption–desorption isotherm. The photocatalytic water splitting are preformed in an aqueous MeOH, used as sacrificial hole scavengers under UV light irradiation. The rate of H2 evolution from an aqueous methanol solution under UV irradiation significantly changed with the variation of loading metal, and Pt loaded niobium oxide catalyst exhibited the highest photoactivity, with a rate of H2 production of 4647 μmol h−1 g−1 which was about 2.2, 2.9 and 6.5 times than Au, Cu and NiO photocatalysts, respectively.

A series mesoporous Nb2O5 with Pt, Au, Cu and NiO cocatalyst were synthesized successfully. Our results reveal the influence of calcinations temperature on physical and photocatalytic properties of mesoporous Nb2O5. The photocatalytic H2 evolution was significantly changed with the variation of metal (Pt, Au, Cu and NiO) loaded on mesoporous Nb2O5. The well dispersed Pt nanoparticles on mesoporous Nb2O5 acted as efficient cocatalyst and led to an ultra high photocatalytic activity with a rate of H2 production. (a) TEM images of Pt/m-Nb2O5 photocatalyst. (b) Time course of H2 evolution: (a) m450-Nb2O5, (b) NiO/m-Nb2O5, (c) Cu/m-Nb2O5, (d) Au/m-Nb2O5 and (e) Pt/m-Nb2O5.Figure optionsDownload high-quality image (222 K)Download as PowerPoint slideResearch highlights
► A series mesoporous Nb2O5 with Pt, Au, Cu and NiO cocatalyst were synthesized successfully.
► The influence of calcination temperature on physical and photocatalytic properties of mesoporous Nb2O5 were observed.
► The photocatalytic H2 evolution was significantly changed with the variation of metal (Pt, Au, Cu and NiO) loaded on mesoporous Nb2O5.
► The Pt loaded mesoporous Nb2O5 showed an ultra high photocatalytic activity with a rate of H2 production of 4647 μmol h−1 g−1, which was about 2.2, 2.9 and 6.5 times than Au, Cu and NiO photocatalysts, respectively.