Abstract
The development of efficient nanocomposites represents a promising strategy for enhancing the transfer and separation of photogenerated carriers within metal-organic frameworks (MOFs) for photocatalytic H2 generation. In this study, we report, for the first time, the successful fabrication of a novel CuGaS2@NH2-MIL-125(Ti) nanocomposite in a two-step synthesis, consisting of octahedral NH2-MIL-125(Ti) metal-organic frameworks interspersed with flat hexagonal plates of CuGaS2. The CuGaS2@NH2-MIL-125(Ti) nanocomposite effectively mitigates the recombination rate of photogenerated electron-hole pairs. Notably, the most active CuGaS2@NH2-MIL-125(Ti) composite (containing 30 wt% CuGaS2) achieves a remarkable hydrogen generation rate of 965.07 μmol/gcat, surpassing the performance of NH2-MIL-125(Ti) and CuGaS2 by approximately 83 and 144 times, respectively. Additionally, the apparent quantum efficiency for the most active material at a wavelength of 380 nm is 9.07%. This study provides valuable insights into the design of efficient I-III-VI2 compound-MOF nanocomposites for H2 generation applications.
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