Compared to the pristine WO3, the oxygen vacancy defect levels of the sub-stoichiometric WO3−X narrow the bandgap and promote the separation of photogenerated electron–hole pairs.

No abstract

The capacity of anode materials plays a critical role in the performance of lithium-ion batteries. Using the nanocrystals of oxygen-free metal-organic framework ZIF-67 as precursor, a one-step calcination approach toward the controlled synthesis of CoO nanoparticle cookies with excellent anodic performances is developed in this work. The CoO nanoparticle cookies feature highly porous structure composed of small CoO nanoparticles (≈12 nm in diameter) and nitrogen-rich graphitic carbon matrix (≈18 at% in nitrogen content). Benefiting from such unique structure, the CoO nanoparticle cookies are capable of delivering superior specific capacity and cycling stability (1383 mA h g(-1) after 200 runs at 100 mA g(-1) ) over those of CoO and graphite.

Monolayer nanosheets of Bi2W1–x Mo x O6 solid solutions, possessing an average thickness of 0.98 nm, have been rationally designed and constructed by a facile bottom-up route of a hydrothermal reaction. The tiptop photocatalytic efficiency of Bi2W1–x Mo x O6 monolayer nanosheets can be achieved for effective reduction conversion of nitrobenzene into anilines under visible light, in conspicuous contrast to the homologous pristine Bi2WO6 and Bi2MoO6 components. The optimal Bi2W0.25Mo0.75O6 monolayer nanosheets exhibit a high selectivity and stability for photocatalytic nitrobenzene reduction, affording a high aniline generating rate of 650 μmol g–1.h–1, in excess of the previously reported ordinary photocatalysts. The good photocatalytic property could be due to the lattice distortion in solid solutions for structural polarity by the more electronegative W substitution, leading to the efficient interfacial and interior separation of photogenerated carriers. The structure–activity relationship of Bi2W1–x Mo x O6 demonstrates a novel insight to devise property-controllable photocatalysts at the atomic level with high efficiency for organic photocatalytic reactions.

No abstract