Journal of Building Engineering
·
2024
·
IF 6.7
Baomin Wang,Weigao Ding,Chengcheng Fan,Fei Liu,Wenxin Lu,Haoxiang Yang
C-S-H gel is a complex cementitious system, and the properties present significant difference with various Ca/Si ratios. The immobilization mechanism of three heavy metals in C-S-H gel at various Ca/Si ratios was investigated in this work from the prospect of the physical adsorption and chemical immobilization. Results showed that higher Ca/Si ratios can result in an increase in silicon chain polymerization, and lower BET specific area, and C-S-H gel with various Ca/Si ratios showed the excellent immobilization for heavy metals. Pb(II) and Zn(II) can form hydroxyl complex polyhedra in C-S-H under strongly alkaline environments, and increase the silicon chain polymerization degree similar to the doping of C-S-H gel by Al. However, Cd(II) was immobilized in the C-S-H gel with the formation of a solid solution under the action of ion exchange with Ca(II), rather than in the form of hydroxyl complex polyhedral and cadmium hydroxide coprecipitates. The highest adsorption capacity of Pb(II) was realized in C-S-H gel with a Ca/Si molar ratio of 0.9, reaching 95.6006 mg/g. Pb(II) was mainly immobilized in C-S-H gel via physical and chemical adsorption, and the effect of chemical adsorption tended to be significant as the Ca/Si molar ratio increased. And the formation of Pb 8 Ca(Si 2 O 7 ) 3 can be detected in C-S-H gel with a higher Ca/Si molar ratio.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 3
·1107-1116
·
IF 3.288
Yan Qiao,Yilian Li,Wenxian Li,Jinrong Bao,Yushan Zheng,Lina Feng,Yangyang Ma,Kuisuo Yang,Anping Wu,He Bai,Yunjiang Yang
In this paper, novel core–shell (CS) structure composites SiO2@ANA-Si–Eu and SiO2@ANA-Si–Eu–L (L = phen, TTA) were prepared by the condensation of 5-N-bis(amidopropyltriethoxysilyl) nicotinic acid (HOOCC5H4NN(CONH(CH2)3Si(OCH2CH3)3)2, abbreviated as ANA-Si) and a SiO2 microsphere with a diameter of 200 nm in the absence of surfactants. The as-synthesized CS structure composites possess good dispersion, uniform size and excellent luminescence properties. Furthermore, silica modified core–shell–shell (CSS) structure composites SiO2@ANA-Si–Eu@SiO2 and SiO2@ANA-Si–Eu–L@SiO2 were successfully prepared by a sol–gel method using CS structure composites as the core and amorphous silica as the shell. Compared with the CS structure composites, CSS structure composites exhibited a stronger luminescence intensity in the solid state. Furthermore, an improved luminescence stability property of the CSS structure composites was found in aqueous medium. CSS structure composites exhibited improved luminescence, high stability and good solubility, which provided potential for their wide use in advanced phosphors, molecular biomarkers and luminescent tracers.
研究领域:
材料科学
·
发光材料
·
无机化学
·
纳米复合材料
·
光学材料
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2018
·
IF 0
Chao Li,Yuhang Ju,Hideya Yoshitake,Masaki Yoshio,Hongyu Wang
As a promising energy storage system , silicon-graphite dual-ion batteries, which are based on the alloying/dealloying of lithium ions in silicon anode, are proposed for the first time. The recent demonstration of anion interaction in graphite layers exhibits the valuable prospects of graphite as an alternative to traditional cathode materials . Dual-ion batteries have demonstrated the characteristics of low cost and high safety and have environmental benefits over other Li-ion batteries. Dual-ion batteries have previously been established, but they require more stable electrolytes under high voltage range. Because most solvents easily decompose at a voltage above 5.2 V, herein, the voltage window of the silicon anode (SA) has been rationally tailored to match that of the graphite cathode (GC). In addition, cycling stability in the full cell was obtained in the commonly used electrolyte of SL:EMC with LiPF 6 . This design strategy shows great potential and value for applications in dual-ion batteries when compared to traditional Li-ion batteries.
研究领域:
电化学储能
·
材料科学
·
能源化学
·
电池技术
·
纳米材料应用
✓ 已验证
DOI
Nanoscale
·
2018
·Vol. 10
·期 40
·19195-19202
·
IF 7.233
Xin-Yang Yue,Zhong Yan,Yun Song,Xiao-Jing Wu,Yong-Ning Zhou
Si/C composites are considered as the most promising anode materials for next-generation lithium-ion batteries (LIBs) due to their high specific capacity and low cost. However, the commercialized Si/C composites cannot maintain a Si content over 10 wt% for sustaining an acceptable cycle life. To achieve long-term cycle stability for Si/C composites with high Si content is still very challenging. Here, we report a rationally designed double-morphology Si/graphene (DMSiG) composite with a high Si content of 78 wt%, and prove its feasibility as a high performance anode material for LIBs. DMSiG composes of Si quantum-dot decorated graphene and mesoporous Si spheres with a complementary hierarchical structure. The graphene framework enhances the electronic conductivity, alleviates the aggregation of mesoporous Si spheres and provides space and flexibility to buffer the volume change during cycling. Mesoporous Si spheres contribute to a large reversible capacity and support the hierarchical architecture of DMSiG. The Si quantum-dots help to build firm connections between graphene and mesoporous Si spheres to avoid their separation during cycling. Coupling these features together, the DMSiG anode delivers a high reversible capacity of 1318 mA h g−1 at a current density of 500 mA g−1 and 684 mA h g−1 at 2000 mA g−1.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Chuanhai Gan,Chengkun Zhang,Pengfei Liu,Yingkuan Liu,Weidong Wen,Bang Liu,Qingshui Xie,Liuqing Huang,Xuetao Luo
A facile method is proposed to prepare Si nanoparticles encapsulated in polymeric carbon (SiNPs-PC) as anode materials for lithium ion batteries . Si nanoparticles (SiNPs) with average diameter of 125 nm are prepared. Under the aid of silane coupling agent, SiNPs are coated with phenolic resin , and SiNPs-PC composite is prepared after carbonization engineering. The SiNPs-PC anode with 63.7 wt% of Si exhibits greatly strengthened electronic conductivity and relatively stable electrode interface. The SiNPs-PC anode delivers a reversible capacity of 984 mA h g −1 with 84% capacity retention after 100 cycles at a current density of 0.1 A g −1 and 710 mA h g −1 after 800 cycles at a current density of 1 A g −1 . When cycled at a very larger current density of 10 A g −1 , a decent reversible capacity of 404 mA h g −1 can be harvested, which is still higher than the theoretical capacity of commercial graphite anode. The electrochemical performances are systematically discussed on microstructure and morphology of electrode materials . The feedstock of SiNPs is recycled from waste Si, and the preparation of SiNPs-PC composite is facile, cost-effective and environmentally benign, which shows great potential of industrial production.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 7
·1246
·
IF 3.06
Xingzhong Guo,Shengchi Bai,Jiaqi Shan,Wei Lei,Ronghua Ding,Yun Zhang,Hui Yang
With methylsilsesquioxane (MSQ) aerogels synthesized by the sol-gel method as a raw material and Si-Ti sol as a binder, an alcohol-based aerogel slurry consisting of only MSQ aerogel and Si-Ti sol was prepared and coated on expanded polytetrafluoroethylene (ePTFE) to form an MSQ aerogel coating layer, followed by low-temperature heat treatment. The effect of Si-Ti sol content on the microstructure of the MSQ aerogel coating layer was investigated, and the properties of a typical MSQ aerogel-layer-coated ePTFE film were evaluated. The results show that Si-Ti sol has an important role in terms of film-forming capability, surface smoothness, flexibility, and powder dropping of the MSQ aerogel coating layer. With a Si-Ti sol of 10.5 wt.% content as a binder and after heat treatment at 170 °C for 30 min, the coated ePTFE flexible thin film with a layer thickness of 30 μm shows high uniformity, integrity, and electrical insulation properties, with an elongation at break decrease over 130%, a thermal conductivity of 0.1753 W/(m·K) at 25 °C, a dielectric constant of 16.5674, and a dielectric loss of 0.06369, which can be promisingly applied in cable sheaths.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2013
·Vol. 2
·期 9
·R196
·
IF 0
Yi-Fei Wang,Lihong Liu,Rong-Jun Xie,Qing Huang
Eu2+ doped BaMgAl10O17:Eu2+ (BAM) phosphors suffer from serious instability, although they have been widely used in various lighting and display applications. In this paper, high thermally stable Si–N-codoped BAM phosphors have been prepared by the microwave assisted sintering method at a relatively low temperature of 1450°C, and they were synthesized at 1550°C by the conventional solid-state reaction method for comparison. The microwave assisted sintering could reduce the activation energy and thus enhance the diffusion rate, and greatly improve the substitution amount of Si–N pairs for Al–O ones in the BAM host lattice. The Si–N doping significantly increased both the photoluminescence and the thermal stability of the BAM phosphors under ultraviolet (UV) and vacuum ultraviolet (VUV) excitations, comparable to the samples prepared by the conventional solid state reaction method. The proposed method is expected to be potentially applicable to other phosphors with higher photoluminescence and stability.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
Inorganics
·
2025
·Vol. 13
·期 4
·115
·
IF 3
Yinan Liu,Wei Jiang,Congcong Zhang,Pingshan Jia,Zhiyuan Zhang,Yun Zheng,Kunye Yan,Jun Wang,Yunxian Qian,Junpo Guo,Rong Chen,Yike Huang,Yingying Shen,Lifen Long,Bang Zheng,Huaiyu Shao
Pre-lithiation using Li–Si alloy-type additives is a promising technical approach to address the drawbacks of Si-based anodes, such as a low initial Coulombic efficiency (ICE) and inevitable capacity decay during cycling. However, its commercial application is limited by the air sensitivity of the highly reactive Li–Si alloys, which demands improved environmental stability. In this work, a protective membrane is constructed on Li13Si4alloys using low-surface-energy paraffin and highly conductive carbon nanotubes through liquid-phase deposition, exhibiting enhanced hydrophobicity and improved Li+/e−conductivity. The Li13Si4@Paraffin/carbon nanotubes (Li13Si4@P-CNTs) composite achieves a high pre-lithiation capacity of 970 mAh g−1and superb environmental stability, retaining 92.2% capacity after exposure to ambient air with 45% relative humidity. DFT calculations and in situ XRD measurements reveal that the paraffin-dominated coating membrane, featuring weak dipole–dipole interactions with water molecules, effectively reduces the moisture-induced oxidation kinetics of Li13Si4@P-CNTs in air. Electrochemical kinetic analysis and XPS depth profiling reveal the enhancement in charge transfer dynamics and surface Li+transport kinetics (SEI rich in inorganic lithium salts) in P-SiO@C pre-lithiated by Li13Si4@P-CNTs pre-lithiation additives. Benefitting from pre-lithiation via Li13Si4@P-CNTs, the pre-lithiated SiO@C(P-SiO@C) delivers high ICE (103.7%), stable cycling performance (981 mAh g−1at 200 cycles) and superior rate performance (474.5 mAh g−1at 3C) in a half-cell system. The LFP||P-Gr pouch-type full cell exhibits a capacity retention of 83.2% (2500 cycles) and an energy density of 381 Wh kg−1after 2500 cycles. The Li13Si4@P-CNTs additives provide valuable design concepts for the development of pre-lithiation materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 46
·20140-20146
·
IF 3.829
Li Shi,Ting Yu,Luwei Sun,Xiaodong Pi,Xinsheng Peng
A free-standing fluorescent gelatin–Si nanoparticle composite thin film is facilely prepared by means of a filtration technique assisted by porous copper hydroxide nanostrands as a sacrificial layer. The as-prepared gelatin–Si nanoparticle composite film is greatly portable, flexible, transparent and free-standing. The most important advantage is its robust storage stability stored in ambient air, which make it promising for various applications. Meanwhile, a gelatin–Si–Au nanoparticle composite film is also successfully prepared by the formation of Au NPs in a gelatin–Si nanoparticle composite film through the in situ reduction of HAuCl4 at room temperature. The photoluminescence (PL) quenching and blue shift in the peak of the emission spectra occur due to the energy transfer from Si NPs to Au NPs. By varying the amount and size of Au NPs incorporated into the gelatin–Si nanoparticle composite film, the energy transfer efficiency can be controlled. This is a general method to prepare metal–semiconductor hybrid fluorescent nanomaterials, which offers the possibility of tuning the luminescence intensity and wavelength of the emitted light.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
WASTE MANAGEMENT
·
2020
·
IF 5.448
Jingwei Li,Yinhe Lin,Jian Shi,Boyuan Ban,Jifei Sun,Yong Ma,Fanmao Wang,Wei Lv,Jian Chen
Separation and recovery of high-purity Si powder from kerf-loss Si slurry waste is a critical challenge for the photovoltaic industry. A green surfactant poly (propylene glycol) bis (2-aminopropyl ether) (PEA) was employed as a collector to facilitate the separation of Si and SiC from kerf-loss Si waste during flotation process. Single flotation tests of Si and SiC were conducted using 5 × 10 −6 mol/L PEA, respectively. The separation efficiencies of Si and SiC in conjunction with PEA adsorption mechanism were investigated. It was found that the maximum recoveries rate of SiC and Si were 90.59% (pH 9.00) and 80.93% (pH 1.96), respectively. Furthermore, the maximum Si grade was determined as 92.31% at pH 8.95 for the sinking part of the mixture generating excellent floatability and selectivity. Zeta potential measurements, FT-IR spectra, and XPS analyses demonstrated that PEA was present on the surface of Si and SiC through electrostatic and hydrogen-bond interactions. The adsorption mechanism was explained based on the results. This research provides an efficient and environmentally friendly route for the separation and recovery of high purity silicon from kerf-loss Si waste.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 33
·13840-13847
·
IF 7.394
Lei Wang,Biao Gao,Changjian Peng,Xiang Peng,Jijiang Fu,Paul K. Chu,Kaifu Huo
Silicon-based nanomaterials are promising anode materials in lithium-ion batteries (LIBs) due to their high theoretical capacity of 4200 mA h g−1, more than 10 times that of commercial graphite. Si nanoparticles (NPs) with a diameter of or below 10 nm generally exhibit enhanced lithium storage properties due to their small size and large surface area. However, it is challenging to generate such ultrafine Si NPs by a facile and scalable method. This paper reports a scalable method to fabricate ultrafine Si NPs 5–8 nm in size from dead bamboo leaves (BLs) by thermally decomposing the organic matter, followed by magnesiothermic reduction in the presence of NaCl as a heat scavenger. The ultrafine Si NPs show a high capacity of 1800 mA h g−1 at a 0.2 C (1 C = 4200 mA g−1) rate and are thus promising anode materials in lithium-ion batteries. To achieve better rate capability, the BLs-derived ultrafine Si NPs are coated with a thin amorphous carbon layer (Si@C) and then dispersed and embedded in a reduced graphene oxide (RGO) network to produce Si@C/RGO nanocomposites by a layer-by-layer assembly method. The double protection rendered by the carbon shell and RGO network synergistically yield structural stability, high electrical conductivity and a stable solid electrolyte interface during Li insertion/extraction. The Si@C/RGO nanocomposites show excellent battery properties with a high capacity of 1400 mA h g−1 at a high current density of 2 C and remarkable rate performance with a capacity retention of 60% when the current density is increased 20 times from 0.2 to 4 C. This work provides a simple, low cost, and scalable approach enabling the use of BL waste as a sustainable source for the production of ultrafine Si NPs towards high-performance LIBs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zhuqing Zhao,Muya Cai,Haijia Zhao,Qiang Ma,Hongwei Xie,Pengfei Xing,Yan xin Zhuang,Huayi Yin
Electrolysis of SiO2 to produce Si in MgCl2-based molten salt faces the challenge of generating chlorine gas at a graphite anode. Herein, we replace the graphite anode with a Mg2Si alloy anode that is paired with a C–SiO2 cathode in molten NaCl–KCl–MgCl2. During the paired electrolysis, the Mg2Si anode releases two Mg2+ ions into the electrolyte, resulting in Si nanostructures, while the C–SiO2 cathode is reduced to C–Si composites without generating SiC. Thus, both electrode reactions obtain desired products, which eliminates chlorine gas evolution and tailors the structure and composition of Si. In addition, the electrolytic Si nanostructures and C–Si composites show enhanced lithium-storage performances. The anodic Si nanostructures display a high initial Coulombic efficiency of 82.7% and achieve a cycling capacity of 1490 mAh g–1 300 cycles later under 2 A g–1. The cathodic C–Si composite that remains inside the carbon matrix derived from rice husks maintains a stable capacity of 780 mAh g–1 and 92.1% capacity retention after 200 cycles at 0.5 A g–1. In addition to Si-based anode materials, this study offers an economical and green paired electrolysis approach to preparing various functional materials.
研究领域:
材料科学
·
电化学
✓ 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）