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Download fileFabrication of CdS/Pt/MIL-125 with Effective Spatial Separation for Improved Visible-Light Catalytic H2 Evolution Using γ‑Ray Irradiation
journal contribution
posted on 2020-12-03, 09:14 authored by Chen Tai, Huarong Liu, Yuan HuHydrogen is a very promising green
energy alternative to fossil
fuel owing to both environmental friendliness and high-energy nature;
however, improving the hydrogen production efficiency of photocatalysts
under visible light has remained a challenge. Herein, CdS/Pt/MIL-125
nanocomposite has been fabricated using γ-ray irradiation, where
Pt and CdS nanoparticles with clean surfaces are well dispersed inside
and on the surface of MIL-125, respectively, which greatly promotes
effective space separation of photogenerated carriers and thus improves
the visible-light catalytic activity. The hydrogen generation rate
of CdS/Pt/MIL-125 nanocomposite is found up to 6783.5 μmol/(g·h)
under visible-light illumination, which is 7.3 times that of CdS/MIL-125
without Pt as electron trap reservoirs and 4.4 times that of Pt/CdS/MIL-125
without effective spatial separation between CdS and Pt. The reason
is attributed to the synergy of ternary CdS/Pt/MIL-125 with a unique
ordered mesoporous structure that may widen the absorption range of
the light, improve the efficiency of light harvesting, facilitate
mass transfer, prevent the aggregation of CdS and Pt nanoparticles,
suppress the electron–hole (e–h) pair recombination,
and provide more active sites. Moreover, the loading amount of Pt
or CdS nanoparticles also affects the activity of CdS/Pt/MIL-125 nanocomposite
for visible-light catalytic H2 evolution. In view of the
extensive use of γ-ray irradiation in industry, this research
presents a rational route to the fabrication of novel hybrid photocatalysts
for improved visible-light catalytic hydrogen evolution.