CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhengliang Liu,Wei Zhang,Huanpeng Bu,Ken Chen,Yan Jiang,Huijun Liu,Chaoliu Zeng
A novel SiC–Si coating with a high amount of net-like distributed Si was fabricated on the graphite substrate by liquid silicon infiltration (LSI) method to improve the oxidation-resistant performance. The mass gain of this LSI coating after 300 h oxidation at 1873 K was only 3.018%, suggesting an excellent static antioxidant property at 1873 K. The detailed oxidation mechanism of this LSI coating was explored in this work. It was found that the high amount of Si with the net-like distribution in this LSI coating promoted the passivation growth of SiO 2 glass layer and prevented the SiO 2 glass from crystallizing into cristobalite. In addition, the Si in this coating retarded the active oxidation and enhanced the coating stability. In contrast, the infiltration (VSI) SiC–Si coating presented an apparent mass loss, and the pack cementation (PC) SiC coating showed the catastrophic failure. The oxidation mechanisms of these two coatings were also discussed against the backdrop of the LSI coating with high antioxidant performance.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2023
·Vol. 23
·期 13
·6184
·
IF 3.9
Xiyuan Dai,Li Wu,Kaixin Liu,Fengyang Ma,Yanru Yang,Liang Yu,Jian Sun,Ming Lu
We present a straightforward approach to develop a high-detectivity silicon (Si) sub-bandgap near-infrared (NIR) photodetector (PD) based on textured Si/Au nanoparticle (NP) Schottky junctions coated with graphene film. This is a photovoltaic-type PD that operates at 0 V bias. The texturing of Si is to trap light for NIR absorption enhancement, and Schottky junctions facilitate sub-bandgap NIR absorption and internal photoemission. Both Au NPs and the texturing of Si were made in self-organized processes. Graphene offers additional pathways for hot electron transport and to increase photocurrent. Under 1319 nm illumination at room temperature, a responsivity of 3.9 mA/W and detectivity of 7.2 × 1010cm × (Hz)1/2/W were obtained. Additionally, at −60 °C, the detectivity increased to 1.5 × 1011cm × (Hz)1/2/W, with the dark current density reduced and responsivity unchanged. The result of this work demonstrates a facile method to create high-performance Si sub-bandgap NIR PDs for promising applications at ambient temperatures.Keywords:Si sub-bandgap near-infrared photodetector;Schottky junction;internal photoemission;graphene
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 45
·29585-29594
·
IF 4.036
Jia-Yu Zeng,Yu-Qi Liang,Yan-Ni Wu,Xiao-Yi Wu,Jia-Ping Lai,Hui Sun
A ratiometric fluorescent probe with blue-emission fluorescence based on N, Si-doped carbon dots (N, Si-CDs) for the detection of balofloxacin (BLFX) was synthesized by simple one-pot hydrothermal carbonization using methotrexate and 3-aminopropyltriethoxysilane (APTES) as carbon materials. The obtained N, Si-CDs showed dual-emission band fluorescence characterization at 374 nm and 466 nm. Furthermore, the synthesized N, Si-CD probe exhibited evidence of ratiometric fluorescence emission characteristics (F466/F374) toward BLFX along with a decrease in fluorescence intensity at 374 nm and an increase in fluorescence intensity at 466 nm. Based on this probe, a highly sensitive and fast detection method for the analysis of BLFX has been established with a linear range of 1–60 μM and a low detection limit of 0.1874 μM, as well as a rapid response time of 5.0 s. The developed assay has also been successfully applied for the detection of BLFX in tablets and rat serum.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 5
·1733
·
IF 3.748
Jinyu Zhang,Cai Jing,Binsong Wang
A signal shut-off probe of Si, N-codoped carbon quantum dots (Si, N-CQDs) was exploited to detect Cr(VI) by fluorescence quenching without the aid of any biomolecules or labeling materials. The sensing system prepared the precursor of diacetone acrylamide and the silane coupling agent 3-aminopropyltriethoxysilane (KH-550) by a simple hydrothermal method, and the quantum yield is as high as 75% Si, N-CQDs. The fluorescence stability and microstructure of the Si, N-CQDs were studied. The Si, N-CQDs has a high sensitivity for detecting Cr(VI) with the linear range of 0–200 μM and the detection limit of 0.995 μM. The quenching mechanism of Si, N-CQDs is attributed to FRET.Keywords:Si,N-codoped carbon quantum dots;hexavalent chromium;fluorescence sensor;mechanism attributed to FRET
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 60
·期 12
·1835-1844
·
IF 0
Shujian Liu,Shaokai Cheng,Ming Xie,Yun Zheng,Gaojie Xu,Shuyu Gao,Jian Li,Zhihong Liu,Xueqing Liu,Jiyan Liu,Bo Yan,Weixiong Yan,Zhanhui Zhang,Guanglei Cui
The silicon (Si)-based anodes suffer from large volume expansion in the lithiation process. Aiming at improving the cycling stability of a Si/graphite composite anode processed by chemical vapor deposition (CVD) method, a functional aqueous binder was delicately designed and synthesized via an aqueous copolymerization of lithium acrylate and vinyl triethoxy silane (VTEO). The PAA-VTEO binder can in situ react with the silanol groups on the surface of Si nanoparticles to form a robust 3D cross-linked network. The resulting extremely high modulus and hardness of this integrated 3D network structure effectively restrained the volume expansion effect and significantly enhanced the electrochemical cycling stability of the CVD-Si@graphite composite anode. This work will provide new perspectives in designing functional binder for Si-based anodes. Graphical
✓ 已验证
产品关联
DOI
ENERGY & FUELS
·
2021
·
IF 3.605
Kai Fang,Liujia Ma,Ya-Jun Cheng,Senlin Xia,Zhaohui Yang,Xiuxia Zuo,Lianmin Ji,Jie Gao,Peter Müller-Buschbaum,Yonggao Xia
Silicon anode has a huge potential to replace graphite anode. Nevertheless, it shows poor long-term cyclic stability and rate capability due to a huge volume change upon lithiation and intrinsic semiconductor property. In this manuscript, a silicon composite with nonagglomerated super-small sized copper nanoparticles (average diameter: 7 nm) was obtained. First, the super-small copper nanoparticles (NPs) are beneficial to enhance the electron conductivity and electrochemical kinetics. Second, the copper NPs help to stabilize the electrode by absorbing mechanical stress. An amine based curing agent works as not only the solvent but also the carbon precursor. The thermosetting epoxy resin inhibits the agglomeration of the copper and silicon nanoparticles. Both silicon and copper nanoparticles are homogeneously dispersed in the carbon formed during the calcination under an inert atmosphere. The influence of the silicon and copper contents on the composition, structure, morphology, crystallinity, porosity, dispersion, and electrochemical performance of the Si/Cu/C nanohybrids are thoroughly studied by various techniques. The structure–property correlation of Si/Cu/C nanohybrids is investigated. A good balance among capacity, cyclic stability, and rate performance is achieved.
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 7
·3297-3305
·
IF 2.394
Shen Kaixiang,Chen Hedong,Hou Xianhua,Wang Shaofeng,Qin Haiqing,Gao Yumei,Shen Jiadong
To improve the long cyclic stability and rate capability of Si-based anode, we demonstrate a core-shell structural Si@NC composite decorates with N-doped carbon network using a low-cost, a simple process of electrospinning and low-temperature pyrolysis. Si@PVP/Urea fabric composite spun on the copper foil was directly carbonized and then was cut into wafers used as the electrode plates without extra conductive agent and binder. The enhanced rate capability and cyclic stability of special structural Si@NC is mainly ascribable to N-doped carbon matrix providing numerous active sites, which attract Li to those points in an efficient way, and the core-shell structures supply high mechanical strength for Si@NC composite. Importantly, almost 3-fold improvement in the capacity retention rate of the Si@NC has been observed at high current densities of 1.6 and 3.2 A g −1 . Meanwhile, DFT calculations confirm that Li will be easily adsorbed by N-active sites in N-doped carbon model to strengthen chemical absorption ability, which could have more chance to grab the quickly moving Li in a brief period. It is significant for theoretical guidance of subsequent studies. The findings should make an important contribution providing a great possibility for the mass production and application to the field of lithium-ion battery.
✓ 已验证
产品关联
DOI
高影响因子
BMC Chemistry
·
2020
·Vol. 14
·期 1
·1-11
·
IF 0
Liu Huachun,Gong Bolin,Zhou Yanqiang,Sun Zhian,Wang Xiaoxiao,Zhao Shanwen
A novel polystyrene sulfonate sodium (PSS) magnetic material was prepared by surface-initiated atom transfer radical polymerization (SI-ATRP). The starting materials were brominated magnetic material as the carrier and macroinitiator, sodium styrene sulfonate (NaSS) as the monomer, and cuprous bromide/2,2′-dipyridyl as the catalyst system. The PSS material was characterized by Fourier transform infrared spectroscopy (FT-IR), elemental analysis, transmission electron microscope (TEM), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and a vibrating sample magnetometer (VSM). The adsorption properties of the material were then investigated on sulfa antibiotics. The kinetic and thermodynamic parameters were determined in adsorption of sulfamethazine (the smallest molecular-weight sulfonamide). The adsorption amount of sulfamerazine free acid (SMR) was found to increase with the initial concentration and temperature of SMR in solution. The adsorption effect was maximized at an initial concentration of 0.6 mmol/L. The static saturation adsorption capacity of the material was 33.53 mg/g, Langmuir and Freundlich equations exhibited good fit. The thermodynamic equilibrium equation is calculated as ΔG < 0, ΔH = 38.29 kJ/mol, ΔS > 0, which proves that the adsorption process is a process of spontaneous, endothermic and entropy increase. Kinetic studies show that the quasi-second-order kinetic equation can better fit the kinetic experimental results, which is consistent with the quasi-second-order kinetic model. The experimental results of kinetic studies were well fitted to a quasi-second-order kinetic equation. High performance liquid chromatography (HPLC) of an actual milk sample treated by the PSS magnetic material confirmed the strong adsorption of SMR from milk.
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2019
·
IF 3.47
Zhi Zheng,Jun Wang,Yi Wei,Xuejun Liu,Fengwen Yu,Jianbing Ji
La-Fe modified Si-MCM-41 (La-Fe/Si-MCM-41) catalysts were prepared by the wet impregnation method and used in catalytic cracking of soybean oil (CCS) for biofuel production. The catalysts were characterized by BET, XRD, XPS, Py-FTIR and CO 2 -TPD. The results showed that the aromatics content increased with the increase in B/L value, while the content of oxygenated compounds decreased, indicating that Brönsted acid sites were the major active sites for deoxygenation and aromatization reactions. Compared with Si-MCM-41, the Brönsted acidity of LFM-6 sharply decreased from 22.49 to 5.86 μmol g −1 . Accordingly, the aromatics content was reduced from 37.51 wt.% to 14.52 wt.% which was lower than the limitation (15 wt.%) according to the global environmental legislation. However, for the LFM-6 catalyst, the excessive loss of Brönsted acid sites and sharp decrease in BET surface area and pore volume led to the decrease in deoxygenation. As a result, the fatty acids content increased from 2.71 wt.% to 16.67 wt.% and the acid value reached 35.20 mgKOH g −1 . When the La-Fe loading increased to 15 wt.%, part of fatty acids were converted into ketones by the active sites on Fe 2 O 3 /La 2 O 3 and strong Lewis acid sites on catalysts. Besides, the new weak Lewis acid and basic sites on Fe 2 O 3 /La 2 O 3 exhibited the synergistic effect on promoting the generation of alkenes. The CaO/LFM-6 composite catalysts prepared by the mechanical mixing of LFM-6 and CaO were used in CCS to reduce the acid value of biofuel. LFM-6-C-3 was proved to be an effective catalyst for CCS to produce biofuel with low aromatics (12.31 wt.%) and fatty acids (2.76 wt.%) content.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 20
·6846-6852
·
IF 4.052
Chenle Zhang,Jingbo Yang,Hongwei Mi,Yongliang Li,Peixin Zhang,Han Zhang
Silicon (Si) is an attractive anode material for lithium-ion batteries due to its high gravimetric and volumetric capacity. However, the challenges for Si anodes are low conductivity, unstable solid electrolyte interphase (SEI) layer and big volume expansion during the charge/discharge process. Inspired by the structure of carob, we propose a yolk–shell structured Si anode which tackles all the problems mentioned above. The non-filling Si clusters protected by atomic layer-deposited TiO2 are embedded in highly conductive one-dimensional carbon nanofibers, which leaves enough space for the expansion and contraction of Si during lithiation/delithiation. Moreover, the SEI layer will form at the outer surface of carbon nanofibers instead of on individual Si nanoparticles and can remain stable and spatially confined. Therefore, the yolk–shell composite electrode exhibits good electrochemical performance and reversible capacities of 1156 mA h g−1 at a current density of 600 mA g−1 after 500 cycles and 485 mA h g−1 at the current density of 9600 mA g−1 after 2000 cycles are obtained.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2019
·
IF 15.548
Rong Shao,Jin Niu,Feng Zhu,Meiling Dou,Zhengping Zhang,Feng Wang
In this work, we demonstrate an efficiency and versatile strategy for the synthesis of Si-based anodes using low-cost biomass and commercially available Si nanoparticles as precursors via conventional slurry coating and low-temperature pyrolysis . Due to the tailored and rational design, gelatin-derived carbon with numerous heteroatoms not only acts as a “conductive skeleton” to enhance the electron/ion transfer but also simultaneously accommodate the Si expansion and immobilize the Si on the current collector via “dual-interfacial bonding”. Without additional binder and conductive agents, the obtained Si-based anode exhibits high initial columbic efficiency (85.3%), high gravimetric capacity (3160 mAh g −1 at 0.2 A g −1 ), large areal capacity (2.81 mAh cm −2 at 0.18 mA cm −2 , approaching the commercial LIB requirement), good rate capability (1613 mAh g −1 at 5 A g −1 ) and cycling performance. Consequently, an assembled Li-ion capacitor utilizing the Si-based anode exhibits high energy density (213 Wh kg −1 ), high power density (22.3 kW kg −1 ), low discharge rate and long lifetime. The scalable synthetic method combined with high performance making this Si-based anode promising for practical applications.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Lixin Xing,Ningning Guo,Yatao Zhang,Haoqin Zhang,Jindun Liu
Silica spheres in nanoscale were prepared via sol–gel method and then sodium 4-styrene sulfonate was grafted onto the surfaces of SiO 2 (PSS-SiO 2 ) by surface-initiated atom transfer radical polymerization (SI-ATRP). Then, a negatively charged loose SiO 2 -PSS/polyethersulfone (PES) nanofiltration membrane with high flux was fabricated via phase inversion method. FT-IR and TEM results showed that SiO 2 nanoparticles were synthesized and modified successfully. GPC results further proved the “living”/controlled behavior of SI-ATRP. The morphology, hydrophilicity of the membranes were investigated by SEM, static water contact angle and water ratio. The results revealed that the surface hydrophilicity and water permeability of hybrid membranes were greatly improved after adding SiO 2 -PSS and thus may enhance fouling resistance to a certain extent. The salt permeation and separation of dye/salt mixture of the hybrid membranes were significantly superior to the pure PES membrane, and the order of permeation for different salt solutions was NaCl > MgCl 2 > MgSO 4 > Na 2 SO 4 . When the content of SiO 2 -PSS was 3.0 wt%, the hybrid membrane showed optimal performance with IEC value of 0.07 mmol/g and pure water flux of 269.5 L m −2 h −1 and the rejections for all types of salts declined to under 11%. The above results indicated that SiO 2 -PSS incorporated into PES matrix played an important role in enhancing the performance of NF membranes, which may possess a significant impact on the application in dye purification and desalination.
✓ 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）