NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Jie Huang,Yanlin Zhang,Junhong Lu,Haoyang Jiang,Ben Liang,Benyuan Wang,Dafang He,Haiqun Chen
Recently, silicon-based anode materials have garnered significant attention from researchers due to their high theoretical specific capacity. However, these materials are highly prone to volume expansion, which significantly hinders their further commercialization. Here, the skeleton of silicon nanoparticles (Si NPs) is constructed from metal–organic frameworks (MOFs) in order to buffer their volume increase and enhance electrochemical performance. In this study, a solvent-thermal reaction is conducted using a mixture of NiFe-MIL and sodium hydroxide solution to deposit a carbon layer around the Si NPs, while simultaneously creating a highly conductive graphene network. Si materials supported by inward multi-channel carbon were synthesized through high-temperature pyrolysis. This unique double-layer carbon structure endows the material with remarkable electrochemical properties, including enhanced cycle stability and lithium storage capacity. The Si@C–NiFe-MIL@reduced graphene oxide (Si@C–NiFe-MIL@rGO) electrode materials exhibit a high specific capacity of 2092.8 mA h g−1 at a current density of 50 mA g−1. Furthermore, they demonstrate a stable reversible capacity of 851 mA h g−1 after 200 cycles at a current density of 1000 mA g−1. This research may provide a different strategy for producing high-energy, reasonably priced silicon anodes for lithium-ion batteries (LIBs).
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1116
·
IF 3.9
Chaokun Yang,Xiangning Ma,Meng Li,Tuantuan Yang,Xin Zhao
Much effort has been devoted to the development of efficient heterogeneous catalysts for the conversion of carbon dioxide (CO2) into high-value chemicals. Generally, the cycloaddition of CO2to epoxides is considered a green and atom-economic reaction for the production of cyclic carbonates. Based on this, three kinds of silicon-based catalysts modified using zinc(Ⅱ) 2-bromoacetic (Si-ZnBA-n, n = 1, 2, 3) were facilely synthesized and employed for the chemical fixation of CO2to epoxides with the use of potassium iodide (KI). A series of characterization techniques were used to characterize the textual structures and physicochemical properties of Si-ZnBA-n. The synergistic effects of Zn, –NH2,–OH and the nucleophilic group guaranteed the catalytic activity of Si-ZnBA-n. Si-ZnBA-1 exhibited the best catalytic activity among Si-ZnBA-n because Si-ZnBA-1 possessed the highest Zn content. Additionally, the effects of the reaction conditions (temperature, pressure, time and catalyst loadings) were also discussed. The propylene carbonate (PC) yield could reach 97% under 130 °C, 2 MPa, for 5 h without the employment of organic solvent, and its selectivity was 99%. In addition, the recycling property of Si-ZnBA-1/KI was also investigated, and the catalytic system exhibited good cycle performance. Meanwhile, the catalyst showed outstanding versatility for CO2application to various epoxides, and a possibly synergistic reaction mechanism was proposed. Finally, a dynamic model was developed to discuss the activation energy of the CO2cycloaddition reaction over the Si-ZnBA-1 catalyst.Keywords:CO2;cyclic carbonate;epoxides;silicon-based;KI
研究领域:
化学工程
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催化科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Hualan Zhou,Yuan Wu,Yongxiang Su,Feng Wang,Shuai Yuan
The silicon-based materials show high capacities. However, the poor intrinsic conductivity and severe volume change during the process of lithiation and delithiation restrict the application. In this work, the nanoscale silicon (Si) with silver-polydopamine (Ag/PDA) hybrid coating was designed and successfully prepared by a simple one-pot liquid-phase redox reaction method. The electrochemical properties of the anode materials for lithium ion batteries were characterized, and the mechanism for the excellent cycling performance were investigated by cyclic voltammetry (CV), Electrochemical impedance spectra (EIS), scanning electron microscopy (SEM) and the operando visual observation during lithiation/delithiation process. According to the results, the presence of PDA and Ag is advantageous to enhance the electronic conductivity in the charge-discharge process. The Si/Ag/PDA ternary composite electrode exhibits high capacity and more stable cycling characteristics than Si and Si/PDA electrodes especially at large current densities, which remains 1168.8 mAh g −1 and after 100 cycles at 2 A g −1 .
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Liyu Zhang,Xuelai Zhang,Weisan Hua,Zhibo Chen
Phase change microcapsules (MPCM) have significant advantages, such as fast thermal response and low leakage rate, which can be widely used in construction, textile, and electric power fields. However, the existing microcapsule preparation process has high costs and complicated steps, which limits its popularization and application. This paper reports a de-organic reform of the in-situ polymerization method for the fabrication of MPCM. The aqueous phase (solvent) consisted of pure deionized water and surfactant instead of conventional partial or pure organic solvents such as ethanol and acetamide. Taking the type and content of surfactant, homogenization speed, solvent ratio and core-shell ratio as the research variables, the optimal fabrication scheme of silicon-based MPCM in an alkaline environment was confirmed. The results showed that the Pa@SiO 2 microcapsules prepared by pure inorganic solvents had great shape stability to prevent phase change material leakage and great temperature regulation performance when appropriate amount of hexadecyl trimethyl ammonium bromide was the surfactant and 3-Aminopropyltriethoxysilane was the silane coupling agent . More importantly, it has high heat storage capacity of 191.5 J/g due to its excellent encapsulation ratio of 76.4 %. Therefore, the fabrication method without organic solvent can simplify the fabrication process and greatly reduce the fabrication cost while ensuring excellent thermal properties of microcapsules, especially the outstanding heat storage capacity, which shows great application prospects in terms of microcapsule large-scale production.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
ACS Applied Polymer Materials
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2025
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IF 4.7
Qirui Huang,Wei Hong,Haiyue Wang,Changyi You,Cai Liu,Lele Zhang,Li Yang,Xuzhou Yan,Ping Yu
Polyimine aerogels, composed of covalent adaptive networks enriched with dynamic imine bonds, have shown remarkable recycling and reprogramming capabilities, marking a notable advancement in the field. However, these aerogels are challenged by inherent hydrophilicity and difficulties in achieving homogeneous nanostructures. Here, we synthesized a series of siloxane (Si)-based polyimine aerogels (Si-DPAs) with a pearl necklace-like microstructure using readily available commercial monomers and an ambient pressure synthesis method. The resultant lightweight Si-DPAs exhibit high flexibility, crimpability, and a high degree of compressibility (up to 80% strain) with a water contact angle of 136°. Moreover, Si-DPAs exhibit chemical degradability and diverse recyclability. They can be promptly employed to fabricate homogeneous films, dynamic aerogels, and recovered adhesives (with a lap shear strength of 4.0 MPa). Additionally, they demonstrate high-value applications in oil–water separation and thermal insulation. This work underscores the potential for the scalable production of polyimine aerogels and suggests avenues for broadening their application spectrum.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Mengnan Li,Xiuli Li,Chunyu Li,Hongchen Liu,Wenxiang Wang,Liangjiu Bai,Hou Chen,Lixia Yang
As functional nanocomposites, Janus nanomaterials can play an important role due to their asymmetric structure and different components on the same surface. In this manuscript, hollow silicon spheres (SiO 2 JHs) with an asymmetric structure were prepared by an emulsion interfacial self-organized sol-gel process. Inspired by mussel chemistry, the exposed surfaces of the SiO 2 JHs were modified chemically by polydopamine (PDA). 2-(3-(6-Methyl-4-oxo-1,2,3,4-tetrahydropyrimidin-2-yl)ureido)ethyl methacrylate (MAUPy) containing multiple hydrogen bond groups were grafted to obtain SiO 2 @PDA/PMAUPy Janus Nanosheets (SiO 2 @PDA/PMAUPy JNs) by Pickering emulsion. The prepared SiO 2 @PDA/PMAUPy JNs were further applied to prepare nanocomposite self-healing hydrogels. As a result of the synergy of reversible non-covalent metal-ligand and hydrogen bonding, hydrogels with dual self-healing feature were successfully fabricated. The obtained hydrogels maintain preferable mechanical properties (strain of about 411.0% and stress of about 4.1 MPa) and excellent healing ratio (92.6%), which may have broad application prospects in smart flexible sensor and biomedical application.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2021
·Vol. 8
·期 19
·4386-4394
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IF 6.569
Xiangzhong Kong,Shi Luo,Liya Rong,Xuefang Xie,Shuang Zhou,Ziqiang Chen,Anqiang Pan
Due to its highest theoretical capacity and low discharge potential, silicon (Si) has attracted increasing attention as one of the most promising anodes for lithium-ion batteries. However, the practical application of Si-based materials is still hindered by rapid capacity fading caused by the huge volume changes of Si during cycling. Herein, a flexible carbon nanotube (CNT)-constructed carbonaceous fibers network anchored with N-doped carbon-coated Si nanoparticles (C/Si/CNTs) has been fabricated. CNTs were sequentially bound together to form a fibrous structure and further crosslinked into a network by electrospinning method. The rational designed conductive network improves the electron transport, buffers the volume changes of inner Si nanoparticles and exhibits excellent mechanical flexibility. Utilized as flexible anodes for lithium-ion batteries, the C/Si/CNTs electrode delivers a high reversible capacity of 696.8 mA h g−1 after 50 cycles at 100 mA g−1, and achieves 473.1 mA h g−1 at 500 mA g−1 (based on the total mass of the electrode). This approach provides a promising strategy to develop high performance silicon-based anode materials for next-generation lithium-ion batteries.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Safdar Ali,Saddique Jaffer,Inamullah Maitlo,Farooq Khurum Shehzad,Qunying Wang,Sikandar Ali,Muhammad Yasir Akram,Yong He,Jun Nie
Silicon based anode materials has got significant attention in recent years due to its environmental affinity, lower cost and high capacity in lithium ion batteries . The Photo cured 3D porous Silica-carbon membrane (SiO 2 –C material) was synthesized via binary phase solid state photo-polymerization, freeze dried to obtain porous membrane and then used as template to get silica deposited membrane by chemical vapor deposition method (CVD) at 30 ° C, followed by calcination . The silicon deposition has been confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS). The Barret-Joyner-Halenda (BJH) pore size distribution results showed the pore size of 10.2924 nm and surface area of 21.1957 m 2 /g with cumulative pore volume of 0.040248 cm³/g. The first discharge capacity reached to 719 mAhg −1 with 79.94% columbic efficiency regarding first cycle and discharge capacity for 100 cycles reached to 693 mAhg −1 with 99% columbic efficiency, which indicated high reaction reversibility. The silicon deposition with a porous structure improved the electronic conductivity and stabilized the material. The better electrochemical performance observed could be due to porous structure and carbon matrix of SiO 2 –C material.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Ali Hammad,Siyi Zou,Fandi Ning,Bin Tian,Wei Li,Xiong Dan,Xi Cheng,Xiaochun Zhou
Hydrogen production from silicon (Si) hydrolysis is environmentally friendly, safe, portable, and promising. However, the self-protected oxide layer around Si and a sluggish hydrolysis rate impede its practical utilization. To address this problem, we introduced sodium hydride (NaH) to form the core–shell structure of NaH/Si composites via a straightforward one-step, hand-mixing method in an ambient environment. NaH-based Si-M composites exhibit 83% hydrogen yield and a 52.7 mL/min hydrogen generation rate at 1–0.7 molar ratios. The hydrolytic activity includes the breakdown of NaH and the continuous hydrolysis of Si. X-ray diffraction, scanning electron microscopy, nanoindentation, and reaction observation studies have verified that NaH is pivotal in promoting thorough Si hydrolysis and attaining the maximum achievable yield compared to calcium hydride (CaH2). NaH/Si composites showed excellent hydrogen generation performance compared to CaH2/Si composites with microstructure silicon Si-S ≈ 1–3 μm, Si-M ≈ 75 μm, and Si-L ≈ 75–425 μm. Our study provided an innovative design and idea for utilizing cost-effective and easily transportable hydrogen production materials for practical applications, which has the potential for further advancement.
研究领域:
材料科学
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能源化学
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纳米技术
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DOI
PubMed
高影响因子
FUEL
·
2020
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IF 5.578
Jianwen Lu,Jian Wu,Lilong Zhang,Zhidan Liu,Yulong Wu,Mingde Yang
In this study, four kinds of porous silica-based materials with site-separated acids and bases were prepared, the catalysts possess both micropores and mesopores with a specific surface areas ranging from 764 m 2 /g to 1016 m 2 /g. Moreover, the effects of the catalysts on the yield and quality of bio-oil derived from hydrothermal liquefaction (HTL) of microalgae Chlorella were investigated. The results showed that the catalyst had no obvious change on the bio-oil yield, but they exhibited good performance in the improving of bio-oil quality. Catalyst with acids inside and outside of the pores worked best in denitrification of the bio-oil while catalyst with bases inside and outside of the pores achieved the minimum sulfur content of the bio-oil (0.65%). GC–MS analysis indicated that the catalyst with site-separated acids and bases showed magnified selectivity to hydrocarbons (over 50% of peak area). Furthermore, the catalyst could increase the low boiling fraction (<400 °C) of the bio-oil to from 68% to 81%. At last, the plausible mechanism of catalyst on HTL was proposed. This study could provide valuable information for production of high quality bio-oil in future researches.
研究领域:
能源生物学
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催化材料科学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2017
·Vol. 83
·期 2
·447-456
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IF 1.575
Mou Yongren,Kang Ming,Wang Feng,Liu Min,Chen Kexu,Sun Rong
Abstract Monodisperse core-shell structured SiO 2 @SiO 2 :Eu(DBM) 3 phen microspheres, as a new kind of fluorescent particles, were fabricated by a seeded growth method in the presence of surfactant CTAB (DBM = dibenzoylmethane, phen = 1,10-phenanthroline, CTAB = cetyltrimethyl ammonium bromide). In this way, a thin mesoporous silica shell doped with Eu(DBM) 3 phen was grown on the prepared monodisperse silica colloids. The structures of the as-prepared phosphors were characterized by means of X-ray diffraction, Fourier transform infrared spectrum, thermal gravimetric analysis–differential scanning calorimetry, field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectrometry, nitrogen adsorption-desorption techniques, and photoluminescence spectra. The experimental results show that the microshpere has a typical core-shell structure with a diameter of about 370 nm, consisting of the silica colloids core with about 340 nm in diameter and mesoporous silica shell doped with europium complexes with an average thickness of about 15 nm. The as-obtained core-shell microspheres exhibit a strong red emission peak originating from electric-dipole transition 5 D 0 → 7 F 2 (610 nm) of Eu 3+ ions under the excitation of 405 nm. Additionally, the photoluminescence intensity increases with the increasing of europium complexes concentration in mesoporous silica shell, and concentration quenching occurs when europium complexes concentration exceeds 7.0 mol%. The prepared microspheres may present potential applications in the fields of optoelectronic devices, bio-imaging, medical diagnosis, and the packing structural functional composites. Graphical Abstract Monodisperse core-shell structured SiO 2 @SiO 2 : Eu(DBM) 3 phen microspheres with high lumious performance were fabricated by a seeded growth method by means of surfactant CTAB.
研究领域:
材料科学
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光学
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生物医学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Heng Yu,Zheng Zheng,Bintao Hu,Zhangfan Ye,Xiaomin Zhu,Yongliang Zhao,Haitao Wang
Hypothesis Janus nanosheets , which have two surfaces of different functionalities, exhibit unique interfacial properties . In this work, we propose a facile and scalable technique for preparation of silica-based Janus nanosheets, which is based on formation of high internal phase water-in-oil emulsions stabilized solely by alkyl-substituted polyethoxysiloxanes due to their hydrolysis-induced interfacial activity. Experiments Janus nanosheets are then obtained by crushing the silica foams converted from such emulsions. The morphology of Janus nanosheets is investigated by field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The chemical structure of functional silica materials is characterized by Fourier transform infrared spectroscopy (FT-IR). The asymmetric structure of silica nanosheets is observed by confocal laser scanning microscopy . Findings The resulting nanosheets have a rough hydrophobic surface and a smooth hydrophilic one, and are capable of stabilizing Pickering oil-in-water emulsions. Remarkably, pH-responsiveness of emulsions can be attained using the nanosheets whose hydrophilic surface is substituted with amino groups. Fast oil–water separation is achieved by the Janus nanosheets, which has been demonstrated by the nanosheets with a polystyrene-coated hydrophobic surface. This work paves a new avenue for large-scale production of functional silica-based Janus nanosheets suitable for numerous promising applications.
研究领域:
材料科学
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化学工程
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界面化学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）