Beijing University of Technology

About: Beijing University of Technology is a education organization based out in Beijing, Beijing, China. It is known for research contribution in the topics: Microstructure & Laser. The organization has 31929 authors who have published 31987 publications receiving 352112 citations. The organization is also known as: Běijīng Gōngyè Dàxué & Beijing Polytechnic University.

Fe3O4/Fe/Carbon Composite and Its Application as Anode Material for Lithium-Ion Batteries

Abstract: A plum pudding-like Fe3O4/Fe/carbon composite was synthesized by a sol–gel polymerization followed by a heat-treatment process and characterized by X-ray diffraction, Raman spectroscopic analysis, ...

In situ experimental mechanics of nanomaterials at the atomic scale

Abstract: The properties of a material depend not only on its composition but also on the exact arrangement of its atoms. In particular, nanostructured materials such as nanotubes, nanocrystals or polycrystalline materials are much stronger and more elastic than their bulk counterparts and exhibit different plastic deformations, making them suitable for a variety of applications. Lihua Wang and co-workers review how recent developments in transmission electron microscopy (TEM) techniques enable materials scientists to characterize, at the atomic scale, both the chemical composition of a nanomaterial and its deformation dynamics under stress and strain, in situ, and in real time. Some possible pitfalls and challenges remain — for example, over-irradiation with the TEM electron beam may damage the sample studied, and observations must typically be carried out under vacuum — but such detailed characterization provides a good understanding of the mechanisms at play. It therefore holds promise for the control of the mechanical, but also chemical and physical, properties of nanostructured materials through the application of stress or strain.

Atomically Dispersed Ni/α-MoC Catalyst for Hydrogen Production from Methanol/Water.

Abstract: Methanol-water reforming is a promising solution for H2 production/transportation in stationary and mobile hydrogen applications. Developing inexpensive catalysts with sufficiently high activity, selectivity, and stability remains challenging. In this paper, nickel-supported over face-centered cubic (fcc) phase α-MoC has been discovered to exhibit extraordinary hydrogen production activity in the aqueous-phase methanol reforming reaction. Under optimized condition, the hydrogen production rate of 2% Ni/α-MoC is about 6 times higher than that of conventional noble metal 2% Pt/Al2O3 catalyst. We demonstrate that Ni is atomically dispersed over α-MoC via carbon bridge bonds, forming a Ni1-Cx motif on the carbide surface. Such Ni1-Cx motifs can effectively stabilize the isolated Ni1 sites over the α-MoC substrate, rendering maximized active site density and high structural stability. In addition, the synergy between Ni1-Cx motif and α-MoC produces an active interfacial structure for water dissociation, methanol activation, and successive reforming processes with compatible activity.