University of Electronic Science and Technology of China

About: University of Electronic Science and Technology of China is a education organization based out in Chengdu, China. It is known for research contribution in the topics: Computer science & Antenna (radio). The organization has 50594 authors who have published 58502 publications receiving 711188 citations. The organization is also known as: UESTC.

Bi metal prevents the deactivation of oxygen vacancies in Bi2O2CO3 for stable and efficient photocatalytic NO abatement

Abstract: Surface oxygen vacancies can normally enhance photocatalytic activity, but also easily suffers from instability and deactivation in continuous photocatalytic purification of air pollutants. Therefore, it is necessary to develop an effective method to improve the photocatalytic stability of oxygen vacancies. In this work, Bi metal nanoparticle decorated Bi2O2CO3 nanosheets with oxygen vacancy (Bi@OV-BOC) are fabricated and exhibited higher photocatalytic activity and stability than Bi2O2CO3 with oxygen vacancy (OV-BOC). The co-effect of Bi metal nanoparticles and oxygen vacancies could also effectively inhibit the formation of toxic intermediates (NO2) and promote it to form final products (NO3−). First-principles density functional theory (DFT) calculation and experimental results suggested that the co-effects of Bi metal nanoparticles and oxygen vacancies (OVs) can largely promote the separation and transfer of photo-generated electron and hole to generate abundant active radicals. More importantly, the Bi metal nanoparticles could be as the active site to activate O2 and H2O molecules so that the O2 and H2O molecules would not fill into oxygen vacancies, resulting in preventing the deactivation of oxygen vacancies. The sufficient active radicals can realize complete oxidation of intermediates into final products and avoid toxic intermediates (e.g. NO2) accumulation. This study reveals the co-effects of Bi and OVs in defective photocatalyst, and also provides fundamental guidance for maintaining the active role of oxygen vacancies.

How to overcome taxonomical problems in the study of Internet use disorders and what to do with "smartphone addiction"?

Abstract: AimsThe present theoretical paper introduces the smartphone technology as a challenge for diagnostics in the study of Internet use disorders and reflects on the term “smartphone addiction.”MethodsS...

Wafer Scale Phase-Engineered 1T- and 2H-MoSe2 /Mo Core-Shell 3D-Hierarchical Nanostructures toward Efficient Electrocatalytic Hydrogen Evolution Reaction.

Abstract: The necessity for new sources for greener and cleaner energy production to replace the existing ones has been increasingly growing in recent years. Of those new sources, the hydrogen evolution reaction has a large potential. In this work, for the first time, MoSe2 /Mo core-shell 3D-hierarchical nanostructures are created, which are derived from the Mo 3D-hierarchical nanostructures through a low-temperature plasma-assisted selenization process with controlled shapes grown by a glancing angle deposition system.

Sulfur-anchoring synthesis of platinum intermetallic nanoparticle catalysts for fuel cells.

Abstract: Atomically ordered intermetallic nanoparticles are promising for catalytic applications but are difficult to produce because the high-temperature annealing required for atom ordering inevitably acc...

Three-dimensional CNT/graphene–sulfur hybrid sponges with high sulfur loading as superior-capacity cathodes for lithium–sulfur batteries

Abstract: A facile method is presented to synthesize three-dimensional carbon nanotube/graphene–sulfur (3DCGS) sponge with a high sulfur loading of 80.1%. In the well-designed 3D architecture, the two-dimensional graphene nanosheets function as the 3D porous backbone and the one-dimensional (1D) highly conductive carbon nanotubes (CNTs) can not only significantly enhance the conductivity, but also effectively tune the mesoporous structure. Compared to the three-dimensional graphene–sulfur (3DGS) sponge without CNTs, the conductivity of 3DCGS is enhanced by 324.7%; most importantly, compared to the monomodal mesopores (with a size of 3.5 nm) formed in the 3DG, bimodal mesopores (with sizes of 3.5 and 32.1 nm) were formed in 3DCG; the bimodal mesopores, especially the newly formed 32.1 nm mesopores, provide abundant electrochemical nanoreactors, accommodate plenty of sulfur and polysulfides, and facilitate charge transportation and electrolyte penetration. The significantly enhanced conductivity and the unique bimodal-mesopore structure in 3DCGS result in its superior electrochemical performance. The reversible discharge capacity for sulfur is 1217 mA h g−1; the corresponding capacity for the whole electrode (including the 3DCGS, the conductive additive and the binder) is 877.4 mA h ge−1, which is the highest ever reported. In addition, the capacity decay is as low as 0.08% per cycle, and the high-rate capacity up to 4C is as large as 653.4 mA h g−1. The 3DCGS sponge with high sulfur loading is promising as a superior-capacity cathode for lithium–sulfur batteries.