Construction of amorphous SiO2 modified β-Bi2O3 porous hierarchical microspheres for photocatalytic antibiotics degradation

The structure of hydrous amorphous SiO2 is fundamental in order to investigate the effects of water on the physicochemical properties of oxide glasses and magma. The hydrous SiO2 glass with 13 wt.% D2O was synthesized under high-pressure and high-temperature conditions and its structure was investigated by small angle X-ray scattering, X-ray diffraction, and neutron diffraction experiments at pressures of up to 10 GPa and room temperature. This hydrous glass is separated into two phases: a major phase rich in SiO2 and a minor phase rich in D2O molecules distributed as small domains with dimensions of less than 100 Å. Medium-range order of the hydrous glass shrinks compared to the anhydrous SiO2 glass by disruption of SiO4 linkage due to the formation of Si–OD deuterioxyl, while the response of its structure to pressure is almost the same as that of the anhydrous SiO2 glass. Most of D2O molecules are in the small domains and hardly penetrate into the void space in the ring consisting of SiO4 tetrahedra.

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Space-charge-limited conduction in r.f.-sputtered pure and vanadium-doped amorphous SiO2 films

Thin Solid Films ◽

10.1016/0040-6090(86)90365-2 ◽

1986 ◽

Vol 145 (2) ◽

pp. 161-170 ◽

Cited By ~ 1

Author(s):

F.C. Eze

Keyword(s):

Space Charge ◽

Amorphous Sio2 ◽

Sio2 Films ◽

Space Charge Limited Conduction ◽

Limited Conduction ◽

Space Charge Limited

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Instantaneous vapor-liquid-solid growth of amorphous SiO2 nanowires within a local-equilibrium plasma and the optimized lithiation/delithiation activity

Applied Surface Science ◽

10.1016/j.apsusc.2021.149848 ◽

2021 ◽

Vol 557 ◽

pp. 149848

Author(s):

Wenfei Yang ◽

Xue Zhang ◽

Feirong Huang ◽

Zhongyuan Zhang ◽

Javid Muhammad ◽

...

Keyword(s):

Local Equilibrium ◽

Vapor Liquid Solid ◽

Amorphous Sio2 ◽

Equilibrium Plasma ◽

Sio2 Nanowires ◽

Vapor Liquid Solid Growth ◽

Vapor Liquid

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Hydrolytic Modification of SiO2 Microspheres with Na2SiO3 and the Performance of Supported Nano-TiO2 Composite Photocatalyst

Materials ◽

10.3390/ma14102553 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2553

Author(s):

Yu Tu ◽

Weihua Ao ◽

Chunhong Wang ◽

Tianyu Ren ◽

Lijuan Zhang ◽

...

Keyword(s):

Sol Gel ◽

Active Surface ◽

Hydroxyl Groups ◽

Nano Tio2 ◽

Amorphous Sio2 ◽

Composite Photocatalyst ◽

Sio2 Shell ◽

Functional Efficiency ◽

Sio2 Microspheres ◽

Better Than

Modified microspheres (SiO2-M) were obtained by the hydrolytic modification of silicon dioxide (SiO2) microspheres with Na2SiO3, and then, SiO2-M was used as a carrier to prepare a composite photocatalyst (SiO2-M/TiO2) using the sol-gel method; i.e., nano-TiO2 was loaded on the surface of SiO2-M. The structure, morphology, and photocatalytic properties of SiO2-M/TiO2 were investigated. Besides, the mechanism of the effect of SiO2-M was also explored. The results show that the hydrolytic modification of Na2SiO3 coated the surface of SiO2 microspheres with an amorphous SiO2 shell layer and increased the quantity of hydroxyl groups. The photocatalytic performance of the composite photocatalyst was slightly better than that of pure nano-TiO2 and significantly better than that of the composite photocatalyst supported by unmodified SiO2. Thus, increasing the loading capacity of nano-TiO2, improving the dispersion of TiO2, and increasing the active surface sites are essential factors for improving the functional efficiency of nano-TiO2. This work provides a new concept for the design of composite photocatalysts by optimizing the performance of the carrier.

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Stabilization of Li0.33La0.55TiO3 Solid Electrolyte Interphase Layer and Enhancement of Cycling Performance of LiNi0.5Co0.3Mn0.2O2 Battery Cathode with Buffer Layer

Nanomaterials ◽

10.3390/nano11040989 ◽

2021 ◽

Vol 11 (4) ◽

pp. 989

Author(s):

Feihu Tan ◽

Hua An ◽

Ning Li ◽

Jun Du ◽

Zhengchun Peng

Keyword(s):

Solid State ◽

Ionic Conductivity ◽

Solid Electrolyte ◽

Buffer Layer ◽

Solid Electrolyte Interphase ◽

Cycling Performance ◽

Physical Contact ◽

Initial State ◽

Amorphous Sio2 ◽

Current Output

All-solid-state batteries (ASSBs) are attractive for energy storage, mainly because introducing solid-state electrolytes significantly improves the battery performance in terms of safety, energy density, process compatibility, etc., compared with liquid electrolytes. However, the ionic conductivity of the solid-state electrolyte and the interface between the electrolyte and the electrode are two key factors that limit the performance of ASSBs. In this work, we investigated the structure of a Li0.33La0.55TiO3 (LLTO) thin-film solid electrolyte and the influence of different interfaces between LLTO electrolytes and electrodes on battery performance. The maximum ionic conductivity of the LLTO was 7.78 × 10−5 S/cm. Introducing a buffer layer could drastically improve the battery charging and discharging performance and cycle stability. Amorphous SiO2 allowed good physical contact with the electrode and the electrolyte, reduced the interface resistance, and improved the rate characteristics of the battery. The battery with the optimized interface could achieve 30C current output, and its capacity was 27.7% of the initial state after 1000 cycles. We achieved excellent performance and high stability by applying the dense amorphous SiO2 buffer layer, which indicates a promising strategy for the development of ASSBs.

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