Considering
the flexibility, adjustable pore structure, and abundant
active sites of metal–organic frameworks (MOFs), rational design
and fine control of the MOF-based hetero-nanocrystals is a highly
important and challenging subject. In this work, self-assembly of
a 3D hollow BiOBr@Bi-MOF microsphere was fabricated through precisely
controlled dissociation kinetics of the self-sacrificial template
(BiOBr) for the first time, where the residual quantity of BiOBr and
the formation of Bi-MOF were carefully regulated by changing the reaction
time and the capability of coordination. Meanwhile, the hollow microstructure
was formed in BiOBr@Bi-MOF through the Oswald ripening mechanism to
separate photogenerated electron–hole pairs and increase the
adsorption capacity of Bi-MOF for dyes, which significantly enhanced
the photocatalytic degradation efficiency of RhB from 56.4% for BiOBr
to 99.4% for the optimal BiOBr@Bi-MOF microsphere. This research broadens
the selectivity of semiconductor/MOF hetero-nanocrystals with reasonable
design and flexible synthesis.
Solar-driven overall water splitting is an ideal way to generate renewable energy while still challenging. For the first time, this work combined covalent organic frameworks (COFs) and piezoelectric material by covalent linkages to form Z-scheme core@shell heterostructure for overall water splitting. Benefiting from the synergistic effect between the polarized electric field and photo-generated charges, as well as the precise adjustment of shell thickness, the carrier separation and utilization efficiency is greatly improved. The optimal BiFeO 3 @TpPa-1-COF photocatalyst revealed hydrogen (H 2 ) and oxygen (O 2 ) production rates of 1416.4 and 708.2 μmol h À 1 g À 1 under the excitation of ultrasonication coupled with light irradiation, which is the best performance among various piezo-and COF-based photocatalysts. This provides a new sight for the practical application of highly efficient photocatalytic overall water splitting.
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