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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.

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For the development of high-performance spintronic nanodevices, one of the most urgent and challenging tasks is the preparation of two-dimensional materials with roomtemperature ferromagnetism and a large magnetic anisotropic energy (MAE). Through firstprinciples swarm-intelligence structural search calculations, we identify an ideal ferromagnetic Fe 3 P monolayer, in which Fe atoms show a perfect Kagome lattice, leading to strong in-plane Fe−Fe coupling. The predicted Curie temperature of Fe 3 P reaches ∼420 K, and its MAE is comparable to those of ferromagnetic materials, such as Fe and Fe 2 Si. Moreover, the Fe 3 P monolayer remains as an above room-temperature ferromagnet under biaxial strains as large as 10%. Its lattice can be retained at temperatures of ≤1000 K, exhibiting a high thermodynamic stability. All of these desirable properties make the Fe 3 P monolayer a promising candidate for applications in spintronic nanodevices.

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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.