Surfaces and Interfaces
·
2024
·
IF 5.7
Yang Chen,Xiaohuan Wang,Xinba Yaer,Zhipeng Yuan,Guojun Ji
As a conversion-type anode material for lithium-ion batteries (LIBs), FeTiO 3 suffers from capacity fading due to the dissolution of Fe ions and the growth of solid electrolyte interphase (SEI) film. This hampers its practical application and further development in LIBs. To solve this issue, the microemulsion method (O/W) was used to encapsulate amorphous SiO 2 onto the surface of FeTiO 3 , constructing a FeTiO 3 @SiO 2 core-shell composite material. This strategy aims to alleviate the capacity loss caused by the rupture and detachment of active substances. The experimental results show that the FTO(FeTiO 3 ) electrode has a capacity of 300 mAh g −1 after 200 cycles at 100 mA g −1 , while the S 1 FTO(FeTiO 3 @SiO 2 ) electrode maintains a stable capacity of approximately 550 mAh g −1 . Furthermore, the capacity of the S 1 FTO (154.4 mAh g −1 after 500 cycles) still surpasses that of FTO (97.5 mAh g −1 after 500 cycles) at a current density of 1 A g −1 . Through ex situ XPS testing analysis of the variations under different current cycles, it is demonstrated that the SiO 2 coating has an inhibitory effect on the dissolution of Fe ions. This core-shell structure-design strategy is crucial for improving the lithium-storage performance of batteries, especially those containing conversion-type anode materials.
研究领域:
材料科学
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电化学
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yaling Zhai,Jiaxin Li,Xiaolong Su,Jian Zhao,Shuanglei Wei,Guichao Tian,Jiamei Liu,Chao Jia,Meifang Zhu
Polyethylene (PE) nonwovens produced via flash spunbonding are widely used in personal protective equipment (PPE) and construction due to their excellent mechanical strength, barrier properties, and balanced water-vapor permeability. However, conventional PE-based protective materials often experience significant heat and moisture buildup during extended use in high-temperature environments, leading to discomfort, excessive perspiration, and even heat stress. Here, we developed radiative cooling PE nonwovens (PE-P/SiO2) by applying a polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)/silicon dioxide (SiO2) hierarchical porous coating via a non-solvent-induced phase separation method. The resulting structure endows the PE nonwovens with high solar reflectance (93.8%) and strong MIR emissivity (96.4%), achieving a cooling effect of up to ∼13 °C under direct sunlight, significantly outperforming conventional PE nonwovens and cotton fabrics. Moreover, the PE-P/SiO2 nonwovens exhibit excellent self-cleaning ability, washing durability, and UV resistance, ensuring long-term performance. These radiative cooling PE nonwovens present a promising solution for enhancing thermal management in PPE and other heat-sensitive applications.
研究领域:
材料科学
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纳米技术
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热工工程
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高分子科学
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防护装备
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 6
·3860-3867
·
IF 7.79
Meng Li,Xiao Zhang,Ping Yang
Silica coating can effectively solve the stability issue of lead halide perovskite nanomaterials. However, it is difficult to achieve aqueous SiO2 coating on hydrophobic CsPbBr3 nanocrystals (NCs). In this paper, the hydrolysis process of tetramethoxysilane was controlled to get a homogeneous SiO2 coating or a NC/SiO2 Janus structure. In step 1, the Cs4PbBr6 NCs were silanized using partially hydrolyzed tetramethoxysilane (PH-TMOS). During this process, the Si–OH groups which came from PH-TMOS were absorbed onto the surface of the Cs4PbBr6 NCs with the removal of hydrophobic oleic acid (OA) ligands. In step 2, phase transformation from Cs4PbBr6 to CsPbBr3 occurred owing to the injection of water. Meanwhile, further hydrolysis of TMOS took place and generated cross-linked Si–O–Si. Because the silanization in step 1 created lots of growth sites, the condensation of SiO2 was not limited to the interface between water and hexane. After growing for 12 h, the fully covered CsPbBr3@SiO2 capsules were prepared. The anion exchange reactions of the CsPbBr3@SiO2 capsules were studied. Only one even and symmetric PL peak was apparent during the anion exchange process, which was different from the bare CsPbBr3 NCs. This result demonstrated that the SiO2 shell can act as a buffer layer to block the direct contact of CsPbBr3 with the excess PbBr2 precursor in solution. Compared with the CsPbBr3 NCs, CsPbBr3@SiO2 showed better stability in polar solvent and air. A bright green emission was also observed under UV light after 90 days. The successful preparation of CsPbBr3@SiO2 capsules with enhanced stability paves the way for the further development of lead halide perovskite nanomaterials.
研究领域:
材料科学
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纳米技术
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Lian-Kui Wu,Jing-Jia Wu,Wei-Yao Wu,Hao-Jie Yan,Mei-Yan Jiang,Fa-He Cao
To improve the hot corrosion resistance, thickness controllable SiO 2 coating was electrodeposited on TiAl alloy. The hot corrosion behavior of the specimens contaminated with 75 wt.% Na 2 SO 4 + 25 wt.% NaCl salt mixture was investigated at 700 °C. Results showed that the generation of compact amorphous SiO 2 embedded with Na 2 Si 4 O 9 and cristobalite was responsible for the enhanced hot corrosion resistance. Moreover, the SiO 2 coating does not only act as a diffusion barrier to sulfur and chlorine but also decreases the oxygen partial pressure at the coating/alloy interface, therefore promoting the selective oxidation of Al to form protective Al 2 O 3 layer.
研究领域:
材料科学
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腐蚀工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）