JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yuzhu Shen,Wei Sun,Yonglong Xu,Qingbo Wen,Hongbo Zhang,Xiang Xiong
In this study, to overcome the difficulties associated with the preparation of PyC-ceramic interface and controllable deposition of the structure, we initially used a two-step molten salt infiltration method to prepare a C/C-Me-Zr-Hf (Me = Ta, Si) composite with excellent oxyacetylene ablation performance. The microstructure and the behavior of ablative were addressed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) as well as by X-ray diffraction（XRD）. The results reveals that C/C-ZrHfC-SiC composite prepared by two-step molten salt infiltration method have a controllable ultra-high temperature ceramic structure and better ablation resistance.
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2021
·
IF 3.407
Wenjia Li,Chang Liu,Dong Liu,Shuda Liu,Tianyan You
The demand for efficient methods to determine mercury ion (Hg 2+ ) is increasing. Herein, we developed a ratiometric fluorescence assay by the coupling of nanozyme and fluorescence resonance energy transfer (FRET) to determine Hg 2+ . Platinum nanoparticles (PtNPs) was synthesized as effective nanozyme to catalyze the oxidation of o-phenylenediamine (OPD) at the presence of hydrogen peroxide (H 2 O 2 ) to produce 2,3-diaminophenazine (DAP). The fluorescence emission of Si quantum dots (QDs) at 414 nm (I 414 ) was observed to be quenched by DAP (emission at 576 nm (I 576 )) via FRET mechanism, whereas Hg 2+ can depress the catalytic activity of PtNPs to generate DAP. Based on this principle, SiQDs/PtNPs/OPD/H 2 O 2 -based ratiometric fluorescence assay was developed that the emission ratio of DAP and SiQDs (I 576 /I 414 ) decreased with a higher concentration of Hg 2+ . Noteworthy, the sensitivity of such system was found to be related with the value of I 576 /I 414 . The developed assay offered a detection range of 20–3000 nM and a detection limit of 10.5 nM. This assay was applied to analyze Yangtze river water, and its reliability has been validated by the standard ICP-MS method. Our work provided an effective and convenient method for Hg 2+ detection.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Chengdong Li,Yuxiang Wang
Significant volume shrinkage during the ambient pressure drying is a common defect in the synthesis of silica xerogels, leading to densification, collapse of pore structure, and a decline in mechanical properties. Conventional methods struggle to produce silica xerogels with both low bulk density and high mechanical properties without additional post-treatment. Herein, we introduce a novel approach by ultilizing trace amounts of iron/silicon oxy-hydroxide co-precipitate trace-incorporated [-Fe-O] m -[Si-O-] n colloids as the foundational building blocks for polymethylsilsesquioxane (PMSQ) xerogels. These colloids were synthesized through the condensation of hydrated iron cations with methyltriethoxysilane (MTES) hydrolysates, which also influence the aggregation and sedimentation of MTES sols. The impact of the hydrolysis time of MTES on the chemical compositions, phase structures, microstructures of the iron/silicon oxy-hydroxide co-precipitates, and mechanical properties of PMSQ xerogels were investigated. The optimal hydrolysis time of MTES in the cetyltrimethylammonium bromide/ferric chloride (CTAB/FeCl 3 ) aqueous solution was 5.0 h, endowing MTES sols containing a trace of ∼0.046 mg/mL iron/silicon oxy-hydroxide co-precipitates. This process yielded PMSQ xerogels with a high compression strength of 0.316 MPa and maximum compression strain of 79.3 %. Deviating from this optimal hydrolysis time by 1.0 h might significantly reduce the compression strength of the as-synthesized PMSQ xerogels by 18.0 %-58.5 % and decrease the maximum compression strain by 6.6 %-15.4 %. Notably, the tiny incorporation of the iron phase (∼0.1 mol%) into the Si-O-Si backbone endowed the PMSQ xerogels with a minimal volume shrinkage ratio of 5.5 %, an ultra-low bulk density of 69.8 mg/cm 3 , and the highest specific strength of 4.527 kPa·m 3 /kg recorded among all aerogels and xerogels in the literature. The strategy of forming iron/silicon oxy-hydroxide co-precipitates to strengthen and toughen silica xerogels by modulating the hydrolysis/condensation kinetics of hydrated iron cations and silica sources holds promise for maximizing mechanical properties and minimizing bulk density under industrially relevant conditions.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Zhongling Cheng,Yi Hu,Keshi Wu,Yusheng Xing,Peng Pan,Liyuan Jiang,Jieting Mao,Changke Ni,Zixi Wang,Mengmeng Zhang,Yaru Zhang,Xiaofeng Gu,Xiangwu Zhang
Silicon anodes are one of the most promising candidate materials for next-generation lithium-ion batteries because of their high theoretical capacity and natural abundance. Unfortunately, the poor conductivity of silicon and large volume expansion (>400%) during the cycle restrict its commercialization. Herein, we combine Si with stable TiO 2 and electrically conductive Ti 2 O 3 to significantly increase the capacity and cycle stability of the Si-based anodes. The preparation of a Si/TiO 2 /Ti 2 O 3 -Carbon Nanofiber (denoted as STTC) composite via mechanical blending, electrospinning and subsequent carbonization of Si, TiO 2 , and polyacrylonitrile (PAN). This material exhibits a reversible specific capacity of 924 mAh g −1 after 500 cycles of 1 A g −1 current density. Moreover, it also exhibits excellent rate performance even at current densities of 6 A g −1 . The outstanding electrochemical performance can be ascribed to Ti 2 O 3 generates in the carbonization process has high ion diffusivity and electrical conductivity. Furthermore, the disordered frame of TiO 2 /Ti 2 O 3 forms voids, which can alleviate the volume expansion of silicon, maintain the electrode integrity during charge and discharge, and form a thin and stable solid electrolyte interphase (SEI). Additionally, the conductive frame of carbon nanofibers also significantly improves the ion and electron conductivity of the complete electrode.
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Small
·
2021
·Vol. 17
·期 40
·2102316
·
IF 13.281
Liang Zhao,Danfeng Zhang,Yongfeng Huang,Kui Lin,Likun Chen,Wei Lv,Yan-Bing He,Feiyu Kang
Constructing a stable solid electrolyte interphase (SEI) on high-specific-capacity silicon (Si) anode is one of the most effective methods to reduce the crack of SEI and improve the cycling performance of Si anode. Herein, the authors construct a reinforced and gradient SEI on Si nanoparticles by an in-situ thiol-ene click reaction. Mercaptopropyl trimethoxysilane (MPTMS) with thiol functional groups ( SH) is first grafted on the Si nanoparticles through condensation reaction, which then in-situ covalently bonds with vinylene carbonate (VC) to form a reinforced and uniform SEI on Si nanoparticles. The modified SEI with sufficient elastic Li x SiO y can homogenize the stress and strain during the lithiation of Si nanoparticles to reduce their expansion and prevent the SEI from cracking. The Si nanoparticles-graphite blending anode with the reinforced SEI exhibits excellent performance with an initial coulombic efficiency of ≈90%, a capacity of 1053.3 mA h g −1 after 500 cycles and a high capacity of 852.8 mA h g −1 even at a high current density of 3 A g −1 . Moreover, the obtained anode shows superior cycling stability under both high loadings and lean electrolyte. The in-situ thiol-ene click reaction is a practical method to construct reinforced SEI on Si nanoparticles for next-generation high-energy-density lithium-ion batteries.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Chaolin Mi,Xiaobo Jiang,Shuxian Zhang,Qingyu Li,Shijian Xiong,Yijie Yan,Xinrui Huang,Yuanchang Shi,Peng Xiao,Chengxiang Wang,Longwei Yin,Rutao Wang
Silicon, known for its high Li+ storage capacity, low redox potential, abundant reserves, and low cost, is regarded as a promising anode material for all-solid-state lithium-ion batteries (ASSLBs). Nevertheless, its practical application is hindered by severe volume expansion and sluggish reaction kinetics. Herein, Si@Mg3N2 composites are synthesized via a vacuum evaporation method, wherein ultrasmall Mg3N2 nanoparticles with an average size of 9 nm are uniformly coated onto the surface of commercial silicon microsheets. During the initial lithiation process, these Mg3N2 nanoparticles undergo an in situ phase transformation, forming a Li–Mg–Si alloy, Li–Mg alloy, and Li3N irreversibly. The resulting Li-rich substances with the mixed ionic/electronic conductive function effectively mitigate the substantial volume expansion associated with the Li–Si alloying reaction (reducing it from 210% to 38.6%), thereby enhancing electrode kinetics and mechanical stability. As a result, the Si@Mg3N2 composite anode delivers a reversible capacity of 2619 mAh g–1 at 0.1 A g–1 and maintains a discharge capacity of 1460 mAh g–1 even at a high rate of 5 A g–1 in half-cell configurations. Furthermore, ASSLBs incorporating the Si@Mg3N2 anode exhibit excellent rate capability (50.8 mAh g–1 at 40 C) and robust cycling stability (61.6% capacity retention after 1000 cycles).
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PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Ke Sun,Haibin Lin,Rui Zhang,Jinlong Zhu,Liping Wang,Songbai Han,Xiaofei Wang
The emerging laser-driven phosphor-converted white laser diodes (w-LDs) demand highly efficient and thermally stable color converters. To this end, the Ce 3+ luminescence in the rekindled La–Si–O–N host, and the impacts of NH 4 Cl flux and post-processing are investigated systematically. On the basis of the XRD results, well crystalline Ce 3+ -doped La 5 Si 3 O 12 N and LaSiO 2 N are obtained at 1600 °C for 5 h and 1500 °C for 4 h, respectively. Impressively, the representative La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ exhibit a broad excitation band from 240 nm to 400 nm, peaking at around 360 nm, which is well matched with emission from near-UV (n-UV) chip. Under excitation by a n-UV laser, the La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ produce bright blue light in a wide emission band from 360 nm to 550 nm. The CIE chromaticity diagram reveals the tunability of the hue of these phosphors. The quenching temperature is determined to be 396 K and 429 K for La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ respectively, indicating superior thermal stability. The addition of 3 wt% NH 4 Cl flux much enhances the emission intensity of both La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ . Furthermore, the post-treatments markedly improve the luminescence properties by increasing the crystallinity , reducing the surface defect , and changing the morphology. Therefore, it is believed that the present work has promising applications in LD lighting and promoting the development of laser display.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Na Zhang,Yufei Zhang,Ting Wang,Wenqing Ge,Tiezhu Zhang,Lipeng Zhang,Weimin Zhang
Silicon-based materials are promising high-capacity anodes for lithium-ion batteries (LIBs). However, they suffer from rapid fracture and pulverization due to extreme volume expansion (theoretically higher than 300%) during the alloying/dealloying reactions with Li. In this work, we demonstrated a simple and mild method by using calcium carbonate as the template to prepare a Si/carbon-based anode material with rich void space (Si@void@C) for LIBs. The yielded void space successfully accommodated the large volume change during the cycling process. The electrochemical characterization verified that the Si@void@C anode exhibited an excellent specific capacity of 973.2 mA h g −1 and high-capacity retention of 84.9% after 100 cycles at a current density of 300 mA g −1 . The morphological study also confirmed that the Si@void@C electrode exhibited the lowest volume changes after many cycles of the charge/discharge process among the electrodes. In addition, the comprehensive performance of Si@void@C was remarkably better than those of Si@C and bare Si electrodes. Hence, Si@void@C is a promising high-capacity anode for next-generation LIBs.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Rui Fang,Wei Xiao,Chang Miao,Ping Mei,Yan Zhang,Xuemin Yan,Yu Jiang
The core-shell structural N-doped carbon encapsulating Si@TiO 2 composite (Si@TiO 2 /NC) are prepared by facile sol-gel, polymerization of dopamine hydrochloride and the following heat treatment processes, which are confirmed by the scanning electron microscopy, X-ray diffractometer, transmission electron microscopy , X-ray photoelectron spectroscopy and thermogravimetric analyses. The as-prepared Si@TiO 2 /NC composite present favorable spherical shape with about 150 nm in diameter and uniform element distribution, and demonstrate the enhanced electrochemical properties compared to the pure silicon , Si@TiO 2 and Si/NC materials when the composite materials are used as anodes for lithium-ion batteries, in which the Si@TiO 2 /NC composite anodes display the favorable initial coulombic efficiency of 75.9%, remarkable charge specific capacity of 1070.9 mAh g −1 with the coulombic efficiency approaching 100% after 100 cycles under the test current of 200 mA g −1 , extraordinary rate and cycle capability with the charge specific capacity of 696.2 mAh g −1 under the test current of 3000 mA g −1 and increased lithium ion diffusion coefficient from 8.179 E-12 cm 2 s −1 to 8.995 E-12 cm 2 s −1 after 100 cycles. Those excellent electrochemical properties can be attributed to the synergistic effect of the robust TiO 2 skeleton and the elastic conductive N-doped carbon network, indicating the as-prepared Si@TiO 2 /NC composite could be a promising anode for lithium-ion batteries.
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高影响因子
TALANTA
·
2018
·
IF 4.244
Lu Qiu,Qi Liu,Xiaoliang Zeng,Qin Liu,Xiandeng Hou,Yunfei Tian,Li Wu
In this work, a facile method coupling solid phase microextraction (SPME) with surface enhanced Raman spectroscopy (SERS) was developed for the detection of trace bisphenol A (BPA). Monolayer graphene-coated Ag nanoparticles (Ag NPs) were fabricated on the Si fiber, which made the Si fiber retain functions of both as a SERS-active substrate and SPME fiber to realize in situ rapid determination of BPA. The SERS-active SPME fiber was immersed in water to extract BPA prior to its detection by SERS. The relative standard deviation (RSD) values of the uniformity and the reproducibility of the SERS-active SPME fiber are 14% and 13%, respectively. The characteristic SERS intensity versus BPA concentration showed a linear relationship (R 2 = 0.958). Due to the combination of the SERS method with SPME, this method exhibits extremely high sensitivity and excellent stability for the detection of BPA, with a limit of detection as low as 1 μg L −1 . The method was successfully used for the determination of BPA in water samples with spiked recoveries ranging from 97% to 110%. Compared to the conventional SERS methods used for the detection of BPA, the present method not only retains the advantages of SERS but also provides several unique advantages including preconcentration of analytes, separation of analyte from sample matrices and improvement of sensitivity, thus making its promising application in environmental analysis of BPA.
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Junchao Sun,Jing Jiang,Zhengshuai Xu,Lintianfang Su,Xinkai Zou,Chuanwei Gao,Yongyin Cui,Zhenyu Zhou,Xiaolei Wang,Hongwei Pan,Lan Cao
Silicon (Si) is a promising anode material for next-generation high-energy-density lithium-ion batteries (LIBs), but its practical use is limited by the severe volume expansion (>300 %) during lithiation/delithiation. To address this, we developed a dual-crosslinked binder using epoxidized polyvinyl alcohol (EPVA) and chitosan (CTS), where EPVA acted as the soft segment and CTS as the rigid segment. By optimizing their mass ratio, the EC55 binder (EPVA: CTS = 5: 5) was achieved, exhibiting high tensile strength (46.65 MPa) and the highest crosslinking density (1.77 × 10 −3 mol cm −3 ). This structure provided reversible elasticity, evenly distributing the stress from Si's volumetric changes and preserving electrode integrity. Consequently, the EC55@Si half-cell, with a Si: binder: Super P ratio of 6: 2: 2, retained 2008.4 mAh g −1 specific capacity after 300 cycles at 1000 mA g −1 . This study also explored the effect of binder content on the electrochemical performance of Si anodes, offering insights into the design of high-performance Si-based LIB binders for future applications.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Meng Ji,Yanan Qiang,Si Li,Chunyuan Tian,Xuming Zhuang,Shengda Qi,Feng Luan
In this study, the interaction mechanism between Si quantum dots (SiQDs) and bovine serum albumin (BSA), as well as the conformational and functional alterations of BSA, were rigorously investigated via multispectral techniques and dynamic light scattering analysis. van der Waals forces and hydrogen bonding, as well as an exothermic reaction and a decrease in entropy, were the primary forces involved in the binding of SiQDs to BSA. In the binding process, SiQDs exhibit preferential proximity to Site I over other potential binding sites. Furthermore, the incorporation of SiQDs into BSA causes a reduction in the α-helix and β-sheet contents of the protein. This, in turn, leads to an increased degree of stretching and an increase in the hydrophilicity of BSA. Furthermore, the increase in the antioxidant capacity and esterase activity of BSA upon the addition of SiQDs was positively correlated with the concentration. These findings elucidate the underlying interaction mechanism between green fluorescence-emitting SiQDs and BSA and provide fundamental insights into both the biological and toxicological implications of SiQDs.
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高影响因子
危险品化学品经营许可证（带存储）