Abstract
A novel bimetallic metal–organic framework (MOF)-derived Ag/NiOx/N-TiO2 photocatalyst with a Z-scheme system was successfully synthesized for photocatalytic hydrogen production. The as-prepared photocatalysts were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscope, X-ray photoelectron spectroscopy, UV–vis spectroscopy, photoluminescence, and photoelectrochemical techniques. Compared to N-TiO2, the Ag/NiOx/N-TiO2 composite material with a wider light absorption range exhibited outstanding photocatalytic hydrogen production using methanol as a sacrificial agent. The optimum Ag/NiOx ratio (5 wt%) results in a hydrogen production rate of 1240 μmol·g−1·h−1 in a 50 v/v% methanol solution. According to the results of the durability test, the synthesized photocatalyst demonstrates good stability. Consequently, a possible mechanism of the photocatalysts and the transformation pathway of methanol have been reported. The Z-scheme system of NiOx and N-TiO2 can effectively separate the electron-hole pairs. The surface plasmon resonance effect of Ag0 enhanced the visible light response. This study provides a valuable reference for the synthesis of MOF-derived photocatalytic technologies and the mechanism of rapid and efficient hydrogen production.
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