INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Guoqiang Qin,Zhitong Jia,Ao Li,Songyuan Sun,Zhibei Liu,Chang-ling Zhuang,Jingbo Chen
Silicon dioxide (SiO 2 ) has huge reserves and relatively high theoretical specific capacity (1965 mAh g −1 ) on the earth, so it is recognized by many researchers as one of the anode materials for the next generation lithium-ion battery (LIBs). However, compared with commercial graphite materials, silicon-based anode materials are severely limited in wide application because of their poor conductivity , low lithium-ion (Li + ) diffusivity and huge volume effect, which lead to obvious capacity attenuation and poor rate performance. Herein, we developed a simple method to prepare silica nanotubes (SNTs) by sol-gel method with Cetrimonium Bromide-Disodium edetate dihydrate (CTAB-EDTA) template. SNTs were modified by 3-aminopropyltriethoxysilane (APTES) to form SNTs with amino groups (SNTs-NH 2 ). The SiO 2 tubes were coated with N−doped carbon layer by self-assembly of amino carboxyl groups of tartaric acid , melamine and SNTs-NH 2 . The unique hollow tubular structure can maintain the stability of the structure and interface to a certain extent during the lithium/de-lithium process, thus improving the cycle stability of the electrode. In addition, N-doped carbon layer can not only improve the electron migration rate, but also contribute to the storage and transfer of Li + . Compared with the original SNTs, N−doped carbon-coated SNTs (NC@SNTs) has a reversible capacity of 972 mAh g −1 after 100 cycles at a current density of 0.1 A g −1 , a cycle stability capacity of 634 mAh g −1 after 500 cycles at a current density of 1 A g −1 . Therefore, the unique template and self-assembly process can prepare anode composites with excellent properties. It is of great significance to the large-scale production and commercial application of silicon−based anode LIBs in the future.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Fan Wang,Wei Liu,Yongsong Ma,Di Chen,Peng Li,Huayi Yin,Wei Li,Dihua Wang
Silicon nanotubes (SNTs) are very attractive in the fields of energy, catalysis, and sensors, but a facile template- and/or catalyst-free preparation method is still absent. Herein, we study a controllable and cost-effective approach for preparing SNTs by electrochemically reducing layer-structured calcium silicate (CaSiO3) in molten CaCl2/NaCl without any template and catalyst. The underlying mechanism of the SNT formation is uncovered: the layer-structured CaSiO3 is first electrochemically exfoliated into SiOx (0 < x < 2) sheets while releasing CaO into the molten salts, and then the SiOx sheets are electrochemically reduced and simultaneously crimped into SNTs. The diameter (120–312 nm) and wall thickness (∼40 nm) of the SNTs can be tailorable by manipulating the reduction potential between −1.28 and −1.48 V (vs Ag/AgCl). Lastly, the electrolytic SNTs show a high lithium storage capacity of 3737 mAh g–1 at 0.2 A g–1, a high rate capability of 1371 mA h g–1 at 10 A g–1, and stable cycling with a capacity of 974 mAh g–1 after 600 cycles at 1 A g–1. Overall, the template- and catalyst-free electrochemical method provides a straightforward and facile way to prepare SNTs with a brand-new mechanism that can be applied to other tubular structure materials.
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
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Changchang Zhang,Heming Cheng,Xiang Liu
A convenient approach of preparing silicon nanotubes (SiNTs) on a silicon substrate is described in this work in detail. Firstly, a porous silicon (PSi) slice is prepared by a galvanic displacement reaction. Then it is put into aqueous solutions of 20% (w%) ammonium fluoride and 2.5 mM cobalt nitrate for a predetermined time. The cobalt ions are reduced and the resulted cobalt particles are deposited on the PSi slice. After the cobalt particles are removed with 5 M nitric acid a plenty of SiNTs come out and exhibit disorderly on the silicon substrate, which are illustrated by scanning electron microscopy (SEM). The compositions of the SiNTs are examined by energy-dispersive X-ray spectroscopy. Based on the SEM images, a suggested mechanism is put forward to explain the generation of the SiNTs on the PSi substrate.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 43
·期 4
·1846-1853
·
IF 3.806
Pan Wang,Mingliang Du,Ming Zhang,Han Zhu,Shiyong Bao
Tubular heterostructures based on titanium dioxide (TiO2) and silica nanotubes (SNTs) with high photocatalytic activity have been successfully obtained by a simple combination of an electrospinning technique and a solvothermal process. The as-prepared products were characterized by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and N2 absorption–desorption experiments. The results confirmed that SNTs with high specific surface area were obtained by efficiently controlling the phase separation and solvent evaporation during the process of electrospinning and calcination, and TiO2 was successfully grown on the SNT substrates. The obtained titanium dioxide/silica nanotubes (TiO2/SNTs) heterostructures showed high photocatalytic activities to degrade Rhodamine 6G because of the formation of heterostructures, which might improve the separation of photogenerated electrons and holes. Furthermore, the TiO2/SNTs heterostructures could be easily recycled without an evident decrease in photocatalytic activity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Xiaoyu Li,Haoran Li,Xueqi Zhao,Yanrong Zhao,Bo Zhang,Keping Zhao,Kang Peng
Amine-impregnated porous solid adsorbents are promising commercial CO 2 capture adsorbents for CO 2 mitigation due to relatively large CO 2 capacity and high CO 2 selectivity . However, the intrinsic viscosity and aggregation of the polyamine leads to low amine efficiency and greatly limits its further development. In this work, a facile and efficient approach was carried out to manipulate the porosity of natural halloysite (HNTs) support with hollow tubular structure and impregnate mixed-polyamines, i.e., both tetraethylenepentamine (TEPA) and diethanolamine (DEA) to synergistically enhance CO 2 adsorption capacity , fast adsorption kinetics and thermal/chemical stability compared to the individual supported TEPA and DEA. The effects of the blend amount for TEPA and DEA, adsorption temperature and CO 2 partial pressure on CO 2 adsorption capacity and adsorption kinetics were specifically discussed. Due to the auxiliary effect of DEA, the chemical reaction between non-hydroxylated TEPA and CO 2 was altered thus improving amine efficiency and the agglomeration layer between protonated TEPA molecules and carbamate, which existed due to electrostatic interaction when TEPA was loaded alone, was loosened thus improving amine efficiency and adsorption kinetics. Therefore, the maximum CO 2 adsorption capacity of MHNTs loaded with 20 wt% TEPA and 20 wt% DEA was 3.25 mmol/g at 75 °C in the flow of 40 vol% N 2 /60 vol% CO 2 . Compared with loading individual TEPA with multiple amino groups on MHNTs, individual DEA with hydroxyl groups could increase the utilization efficiency of the amino groups of TEPA and ultimately obtain excellent CO 2 capture capacity and adsorption kinetics. The experimental results show that the adsorbents obtained in this study using mixed amine impregnated silica nanotubes derived from natural minerals have a promising application in practical CO 2 capture and separation processes.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2013
·Vol. 24
·期 37
·375603
·
IF 3.842
Fang Pu,Jinsong Ren
Fluorescent silica nanotubes are attracting increasing interest because of their versatile applicability in a range of diverse fields. By using sol–gel transcription of tetraethylorthosilicate (TEOS) from various soft templates, silica nanotubes can be conveniently prepared. Metal–peptide hybrids with well-defined nanostructures and outstanding functionalities are very interesting candidates to serve as templates. Herein, we demonstrate that glutathione (GSH) can act as a building block for a bioinspired structure with dimensions down to the nanoscale, based on specific interactions between metal ions and the peptide. Congo red is able to selectively stain the nanofibres obtained, and appears apple-green in colour, implying that Congo red is promising to serve as an effective and convenient probe for determining the self-assembly of GSH and copper ions. Furthermore, silica nanotubes are synthesized using the nanofibres as a template in a very simple way. The silica nanotubes can be lit up by biomolecule-templated metal nanoparticles or nanoclusters and emit bright fluorescence. This work will certainly open up new opportunities in fabricating a broad range of nanostructured materials with versatile functionalities.
研究领域:
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 4
·1073
·
IF 4.412
Jingxin Zhu,Haijuan Wu,Ding Wang,Yanlong Ma,Lan Jia
This paper presents a facile and low-cost strategy for fabrication lysozyme-loaded mesoporous silica nanotubes (MSNTs) by using silk fibroin (SF) nanofiber templates. The “top-down method” was adopted to dissolve degummed silk in CaCl2/ formic acid (FA) solvent, and the solution containing SF nanofibrils was used for electrospinning to prepare SF nanofiber templates. As SF contains a large number of -OH, -NH2and -COOH groups, the silica layer could be easily formed on its surface by the Söber sol-gel method without adding any surfactant or coupling agent. After calcination, the MSNTs were obtained with inner diameters about 200 nm, the wall thickness ranges from 37 ± 2 nm to 66 ± 3 nm and the Brunauer–Emmett–Teller (BET) specific surface area was up to 200.48 m2/g, the pore volume was 1.109 cm3/g. By loading lysozyme, the MSNTs exhibited relatively high drug encapsulation efficiency up to 31.82% and an excellent long-term sustained release in 360 h (15 days). These results suggest that the MSNTs with the hierarchical structure of mesoporous and macroporous will be a promising carrier for applications in biomacromolecular drug delivery systems.Keywords:mesoporous silica nanotubes;electrospinning;silk fibroin;drug release;lysozyme
研究领域:
纳米技术
·
材料科学
·
生物医学工程
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jia Li,Yan Wang,Xin Zheng,Ying Zhang,Changshan Sun,Yikun Gao,Tongying Jiang,Siling Wang
Mesoporous silica nanotubes (SNT) were synthesized using hard template carbon nanotubes (CNT) with the aid of cetyltrimethyl ammonium bromide (CTAB) in a method, which was simple and inexpensive. Scanning electron microscopy, transmission electron microscopy and specific surface area analysis were employed to characterize the morphology and structure of SNT, and the formation mechanism of SNT was also examined by Fourier transform infrared spectroscopy. There are few published reports of the mesoporous SNT with large specific surface area applied in the drug delivery systems to improve the amount of drug loading. In addition, the structure of SNT allows investigators to control the drug particle size in the pore channels and significantly increase the drug dissolution rate. The insoluble drug, cilostazol, was chosen as a model drug to be loaded into SNT and we developed a simple and efficient method for regulating the drug release by using a gelatin coating with different thicknesses around the SNT. The release rate was adjusted by the amount of gelatin surrounding the SNT, with an increased barrier leading to a reduction in the release rate. A model developed on the basis of the Weibull modulus was established to fit the release results.
研究领域:
药剂学
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纳米医学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Pan Wang,Mingliang Du,Han Zhu,Shiyong Bao,Tingting Yang,Meiling Zou
Silica nanotubes (SNTs) with controlled nanotubular structure were synthesized via an electrospinning and calcination process. In this regard, SNTs were found to be ideal adsorbents for Pb(II) removal with a higher adsorption capacity, and surface modification of the SNTs by sym-diphenylcarbazide (SD-SNTs) markedly enhanced the adsorption ability due to the chelating interaction between imino groups and Pb(II). The pH effect, kinetics, isotherms and adsorption mechanism of SNTs and SD-SNTs on Pb(II) adsorption were investigated and discussed detailedly. The adsorption capacity for Pb(II) removal was found to be significantly improved with the decrease of pH value. The Langmuir adsorption model agreed well with the experimental data. As for kinetic study, the adsorption onto SNTs and SD-SNTs could be fitted to pseudo-first-order and pseudo-second-order model, respectively. In addition, the as-prepared SNTs and SD-SNTs also exhibit high adsorption ability for Cd(II) and Co(II). The experimental results demonstrate that the SNTs and SD-SNTs are potential adsorbents and can be used effectively for the treatment of heavy-metal-ions-containing wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Fan Wang,Yongsong Ma,Peng Li,Chuang Peng,Huayi Yin,Wei Li,Dihua Wang
Understanding the material formation mechanism is critical to guide the material synthesis and exploitation. Herein, we reveal a different conversion mechanism of SiO2 particles to Si nanotubes (SNTs) in the molten salt electrolysis. Unlike conventional strategies employing templates and/or catalysts, the one-step electrochemical synthesis is template- and catalyst-free, which process involves lamination, exfoliation, and reduction. Specifically, SiO2 particles are first converted into layer-structured CaSiO3, from which CaO and O2– are subsequently extracted, causing the collapse of the layer structure and forming SiOx (0 < x < 2) layers. The newly formed SiOx layers are finally deeply reduced into SNTs. Besides, the morphology of silicon-based nanostructures can be controlled via altering the applied voltage between a SiO2 cathode and a graphite anode. In addition, the electrolytic SNTs show enhanced lithium-storage performances, such as a high specific capacity (2485 mAh g–1 at 0.2 A g–1) and an excellent rate capability (1362 mAh g–1 at 5 A g–1), which is benefited from the tube structure that can buffer the volume variation of Si. Overall, the revealed conversion mechanism will shed light on designing advanced Si-based nanomaterials for various applications.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Shengbo Zhang,Mei Li,Qilong Wu,Hongchen Yang,Jinyu Han,Hua Wang,Xiao Liu
An efficient heterogeneous photocatalytic system for high-purity hydrogen evolution from formate or aldehyde-water solution were developed using IrCp*Cl (Cp* = η 5 -pentamethylcyclopentadienyl) complex anchored onto the robust bipyridine-based organosilica nanotubes as a solid catalyst. This system can be conducted at the room temperature with a visible light (λ > 420 nm) illumination. The heterogeneous molecular photocatalyst displayed much improved catalytic activity and recyclability compared to the analogous homogeneous catalyst, benefiting from the isolated photoactive sites as well as the efficient transport of substrates and products in the nanotube channels. A detailed characterization for the solid catalyst after the reactions by UV/vis, XPS and 13 C CP MAS NMR testified the molecular nature of the active species. This work provides an easy method to construct the heterogeneous molecular photocatalysts for the high-purity hydrogen generation under mild conditions.
研究领域:
无机化学
·
材料化学
·
催化化学
·
纳米科技
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 68
·期 2
·204-212
·
IF 1.66
Gao Fei,Song Yanhua,Sheng Ye,Lin Chunming,Huo Qisheng,Zou Haifeng
Photoluminescent nano material has been reported as an intriguing field during the past few decades. In this article, tartaric-templated silica nanotubes were conveniently synthesized by sol–gel method. X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, fourier transform infrared spectra and photoluminescence spectra analysis were employed to characterize the growth, structure, morphology and optical property of the products. It is found that tartaric templates can form spindle/spherical-like aggregates composed of many sheets under static/stirring condition, which lead to the different shapes of silica nanotubes. Then the probable strategies for silica nanotubes templating with tartaric acid were described particularly. Hydrogen-bond interaction, supramolecular interaction and a competition of various effects may be the reasons of the nanotubes formation. Moreover, under ultraviolet light excitation, the silica nanotubes exhibited blue emission and luminescent intensity of the tubes prepared under the static condition is much stronger than the stirring ones, mostly because of more defect centers in the structures obtained under stirring condition.
研究领域:
材料科学
·
光学
✓ 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）