Abstract
The annealed Ti3C2Tx MXenes retained original layered morphology and gave rise to the formation of TiO2 is anticipated to achieve improved photocatalytic hydrogen evolution performance as a noble-metal-free co-catalyst. In this work, a novel Ti3C2/TiO2/UiO-66-NH2 hybrid was rationally designed for the first time by simply introducing annealed Ti3C2Tx MXenes over water-stable Zr-MOFs (UiO-66-NH2) precursors via a facile hydrothermal process. As expected, the rationally designed Ti3C2/TiO2/UiO-66-NH2 displayed significantly improvement in photocatalytic H2 performance (1980 μmol·h−1·g−1) than pristine UiO-66-NH2 under simulated sunlight irradiation. The excellent photocatalytic HER activity can be attributed to the formation of multi-interfaces in Ti3C2/TiO2/UiO-66-NH2, including Ti3C2/TiO2/UiO-66-NH2, Ti3C2/TiO2 and Ti3C2/UiO-66-NH2 interfaces, which constructed multiple pathways at the interfaces with Schottky junctions to accelerate the separation and transfer of charge carriers and endowed the accumulation of photo-generated electrons on the surface of Ti3C2. This work expanded the possibility of porous MOFs for the development of efficient photocatalytic water splitting using annealed MXenes.
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