The
construction of efficient photocatalysts for water splitting
to enable H2 evolution is pivotal to alleviate energy issues
and environmental concerns. In this work, carbon dots (CDs) were prepared
by employing “green solvent” ionic liquids as carbon
sources and then combined with Pt/NH2-MIL-125, resulting
in the emergence of a high-efficiency photocatalyst termed CDs-Pt/NH2-MIL-125 for the first time. This composite photocatalyst
exhibited outstanding photocatalytic activity in H2 production
under visible light irradiation. Notably, the H2 production
rate of CDs100-Pt/NH2-MIL-125 reaches up to
951.4 μmol/g/h, which was 3.1 times that of Pt/NH2-MIL-125. The characterization results indicate that CDs and Pt uniformly
dispersed on the surface of NH2-MIL-125 and fabricated
a synergistic compact structure, providing a high BET surface area
(985 m2 g–1) and a suitable band gap.
Furthermore, the distinctive embeddable-dispersed CDs and Pt, as dual
cocatalyst, can harvest light and facilitate the transfer of photogenerated
electrons, thereby significantly augmenting the exploitation of visible
light. The plausible mechanism of photocatalytic H2 evolution
over the CDs-Pt/NH2-MIL-125 catalyst was also discussed.
This work introduces a promising strategy for designing high-performance
CDs-MOFs-based photocatalysts, an innovative step toward achieving
efficient photocatalytic water splitting for H2 production.