University of Science and Technology Beijing

About: University of Science and Technology Beijing is a education organization based out in Beijing, China. It is known for research contribution in the topics: Microstructure & Alloy. The organization has 41558 authors who have published 44473 publications receiving 623229 citations. The organization is also known as: Beijing Steel and Iron Institute.

Bi2O3 quantum dots decorated anatase TiO2 nanocrystals with exposed {001} facets on graphene sheets for enhanced visible-light photocatalytic performance

Abstract: Due to its great importance in fundamental research and practical applications, tailored synthesis of anatase TiO 2 dominated with highly energetic {0 0 1} facets has attracted extensive interest. Here, Bi 2 O 3 quantum dots decorated anatase TiO 2 with exposed {0 0 1} high energy facets had been firstly prepared on graphene sheets by a simple and feasible strategy using the hydrofluoric acid. During the synthesis process, TiO 2 nanosheets were homogeneously decorated with surface enrichment of Bi 2 O 3 quantum dots and graphene was uniformly covered with a large number of Bi 2 O 3 /TiO 2 composites. The morphologies, structural properties and photocatalytic performance of the resultant Bi 2 O 3 /TiO 2 /graphene composites were investigated and were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectra, UV–vis diffuse reflectance spectrum and photoluminescence spectra. A certain amount of Bi 2 O 3 quantum dots coating on TiO 2 nanosheets exhibited significant improvement in photocatalytic degradation of the azo dye Rhodamine B under visible-light irradiation than TiO 2 nanosheets, which could be attributed to the extending spectral response from UV to visible area, the enhanced photosensitizing effect of the surface enriched Bi 2 O 3 quantum dots and the strong interaction between Bi 2 O 3 and TiO 2 . Furthermore, the Bi 2 O 3 /TiO 2 /graphene hybrids could be used as a stable photocatalyst for the highest photocatalytic activity for Rhodamine B degradation, which is ascribed predominantly to the efficient reduction of electron–hole pair recombination in the heterostructures. This investigation likely opens up new possibilities for the development of highly efficient TiO 2 based photocatalysts that utilize visible-light as an energy source.

Sb3+ Dopant and Halogen Substitution Triggered Highly Efficient and Tunable Emission in Lead-Free Metal Halide Single Crystals

Abstract: Rational doping and compositional control remain significant challenges in designing luminescent metal halides to achieve highly efficient and tunable emission. Here, the air-stable lead-free Cs2In...

Rechargeable ultrahigh-capacity tellurium–aluminum batteries

Abstract: For exploring promising energy storage devices beyond lithium ion batteries, aluminum ion batteries (AIBs) are desirable cells with high energy-to-price ratios because of abundant natural resources, the higher energy density of aluminum and elimination of unexpected safety risks. Nevertheless, an ideal rechargeable AIB configuration with ultrahigh capacity is still fundamentally pursued. For fundamentally promoting the most promising chalcogen or chalcogenide-based AIB positive electrode materials, here rechargeable tellurium (Te) nanowire positive electrodes are demonstrated to construct novel tellurium–aluminum batteries. The cell configuration allows Te nanowires for delivering an ultrahigh discharge capacity ∼1026 mA h g−1 (with a specific current of 0.5 A g−1) along with an initial 1.4 V discharge voltage, competitive with the record-setting energy density of the documented AIBs. For essentially tackling the dramatic capacity loss in tellurium positive electrodes, the mechanism of impacting the rechargeable ability is linked to the production of soluble tellurium chloroaluminate compounds upon both chemical dissolution and electrochemical conversion processes. As a consequence, the cell configuration is proved to substantially suppress the unexpected shuttle effects induced by soluble tellurium chloroaluminate compounds via employing reduced graphene oxide to support the tellurium positive electrodes as well as utilizing functionalized carbon nanotube membranes to modify the separators. The implication of the results suggests a nice plateau for massively promoting the rechargeable ability of AIBs, advancing remarkable routes for achieving ultrahigh capacity and energy density.