One-step synthesis of mesoporous Pt–Nb2O5 nanocomposites with enhanced photocatalytic hydrogen production activity

摘要

Mesoporous Pt–Nb _(2) O _(5) photocatalysts with high photocatalytic hydrogen production activity were synthesized by a one-step method. The mesoporous structure of the as-made samples was characterized by X-ray diffraction, N _(2) adsorption–desorption isotherms and transmission electron microscopy. Pt–Nb _(2) O _(5) exhibited higher hydrogen production activity than pure Nb _(2) O _(5) and 0.8-Pt–D–M–Nb exhibited the best photocatalytic activity. In addition, Pt–Nb _(2) O _(5) synthesized by a one-step method exhibited higher photocatalytic hydrogen production activity than that prepared by an incipient wetness impregnation method; 0.8-Pt–D–M–Nb exhibits a H _(2) evolution rate of 9.79 mmol h ~(?1) g ~(?1) , while 0.8-Pt–I–M–Nb _(2) O _(5) exhibits a H _(2) evolution rate of 7.73 mmol h ~(?1) g ~(?1) . The enhanced photocatalytic activity of Pt–Nb _(2) O _(5) was predominantly attributed to the efficient separation of photoinduced electrons and holes.