JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Gui Li,Jianjie Hao,Jiayan Li,Pengyu Dai,Bo Wang,Yuanqi Li,Yi Tan,Xueqiang Cao
This work firstly evaluated the effect of temperature on the preparation of SiC coating using Al 2 O 3 as catalyst by pack cementation (PC) method. SiC/ZrB 2 -SiC-Si (ZSS) and SiC/ZrB 2 -SiC-Al 2 O 3 (ZSA) coating were prepared on the surface of C/C composites by PC combined with atmospheric plasma spraying (APS). The objective of this work is to study the influence of Si and Al 2 O 3 additives for ablation performances of ZrB 2 -SiC coating. The coated samples were subjected to ablation test, and the phase composition and microstructure evolution were investigated. The results indicated that SiC/ZSA coating had better ablation resistance because phase transformation and growth of ZrO 2 grain was restrained by Al 2 O 3 .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Si Yi,Zhilin Yan,Xingda Li,Zhen Wang,Pengpeng Ning,Jingwen Zhang,Jinlan Huang,Deren Yang,Ning Du
With the rapid progress of portable electronics and electric vehicles , high-energy lithium-ion batteries (LIBs) with fast-charging technology are urgently required. Silicon (Si) is considered as the most promising anode candidate for high-energy LIBs but challenging to large-scale commercialization due to its huge volume change and poor conductivity. To develop high-capacity Si-based anode materials with enhanced lithium-ion diffusion and fast reaction kinetics, we design a novel high-Si-content Si/hard carbon composite via scalable methods. The combination between phosphorus-doped hard carbon with porous structure and uniformly distributed Si nanolayers effectively improve lithium-ion kinetics and mitigate the volume change of Si. As a result, the architecture delivers a reversible capacity of 1124 mAh/g at 0.1C and superior cycling stability with an 87.4% capacity retention after 200 cycles at 1C. The 1.5 A h pouch-type full-cell tests further demonstrate good cycling stability and high rate performance at 4C under an electrode density of 1.6 g cm −3 and areal capacity loading of 3.53 mAh cm −2 . This work paves a new way for the rational design of Si-based anode materials for high-energy and high-power LIBs.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
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IF 6.9
Jinjie Mo,Ziye Ling,Zhengguo Zhang,Xiaoming Fang
In this paper, we investigate a metal composite prepared using a one-step pressing method, where Al–Si alloy acts as the phase change materials (PCMs) and Al 2 O 3 /AlN serve as the structural support materials. The alloy formation and PCM composite preparation are synthesized in a single step. The study aims to characterize the microstructure, thermodynamic, and thermal properties of the composite material. To assess the heat storage properties of the prepared composite PCMs at temperatures higher than 600 °C, a high-temperature test system is established using a high-frequency induction heater. Additionally, we explore how to improve the issue of liquid leakage under high-temperature conditions. The results demonstrate that Al 2 O 3 and AlN (ceramic materials) exhibit excellent chemical compatibility with Al–Si composite PCMs. After sintering, the ceramic materials form a strong bond with Al–Si, effectively retaining the liquid phase of Al–Si alloy within the composite material. Consequently, the Al–Si composite PCMs do not exhibit high-temperature liquid leakage under elevated conditions. Both Al 2 O 3 /Al–Si and AlN/Al–Si composites possess favorable high temperature heat storage properties. The phase change enthalpy of Al 2 O 3 /Al–Si composite reaches 400 kJ/kg, with a thermal conductivity of 36 W/(m·K). Similarly, the AlN/Al–Si composite achieves a phase change enthalpy of 404 kJ/kg and a thermal conductivity of 43 W/(m·K). Both composites fulfill the requirements for high-temperature heat storage applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·54556-54567
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IF 5.8
Zhang Ge,Yang Huifen,Li Xuan,Zhou Yichen,Guo Song,Zhao Tong
The control of multiple heavy metals (HMs) pollution in solid wastes, especially the co-contamination of As and other heavy metal cations, is of great importance to ecological and environmental health. To address this problem, the preparation and application of multifunctional materials have attracted wide attention. In this work, a novel Ca-Fe-Si-S composite (CFSS) was applied to stabilize As, Zn, Cu, and Cd in acid arsenic slag (ASS). The CFSS exhibited synchronous stabilization ability for As, Zn, Cu, Cd and owned strong acid neutralization capacity. Under simulated field conditions, the acid rain extracted HMs in ASS successfully decreased below the emission standard (GB 3838–2002-IV category in China) after incubated by 5% CFSS for 90 days. Meanwhile, the application of CFSS promoted the transformation of leachable HMs into less accessible forms, which was conductive to the long-term stabilization for HMs. There was competitive relation among the three heavy metal cations, following the stabilization sequence of Cu > Zn > Cd during incubation. And the stabilization mechanisms of HMs by CFSS were proposed as chemical precipitation, surface complexation, and ion/anion exchange. The research will be greatly conducive to the remediation and governance of field multiple HMs contaminated sites.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kangyu Liu,Bingzhang Shao,Haichao Liu,Jinlong He,Aiguo Zheng,Genghong Li,Bo Zheng,Zeyang Li,Wei Liu,Xuefeng Li,Baoning Zong
Antibacterial monomers are prerequisites for synthesizing antibacterial polymers, especially during the current COVID-19 pandemic. Dimethyl-protected cyclic lysine (DMCL) is a promising functional monomer for nylon-6 based self-cleaning antibacterial polymers. However, the production of DMCL still faces formidable challenges, such as harsh reaction conditions and low catalyst activities. In this study, we developed a Pd/ m -Al 2 O 3 -Si catalyst, which exhibited high efficiency in converting α -amino- ε -caprolactam ( α -ACL) to DMCL, affording a yield of as high as 97.1% at 100 °C and 1 MPa H 2 . The lack of Brönsted acid sites on the catalyst surface facilitated the formation of DMCL and suppressed undesirable hydrolysis or cracking by-products from the lactam-based reactant. The recycled experiments showed that Pd/ m -Al 2 O 3 -Si performed excellent stability and physical strength with essentially no damage to its microspheres after the reaction. The nylon‑6 copolymers produced from the as-synthesized DMCL exhibited similar structure and thermal stability with pure nylon-6, showing great potential in synthesizing the self-cleaning antibacterial polymers. This work provides a sustainable and efficient method for producing DMCL and other lysine-based antibacterial monomers, showing a great prospect for the utilization of bio-based chemicals in synthesizing functional polymers.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 39
·10472-10479
·
IF 5.976
Man Du,Baolong Huo,Jiemin Liu,Mengwen Li,Ao Shen,Xue Bai,Yaru Lai,Leqiu Fang,Yunxu Yang
In this paper, a new near-infrared and fluorogenic fluorescent probe (SiR-amide) based on Si-rhodamine for the detection of phosgene is reported. The fast and sensitive phosgene detection was achieved by the conversion reaction of an amide to a nitrile, which resulted in a large fluorescence turn-on response. The response time of SiR-amide to phosgene was 4 min with a detection limit of 8.9 nM in solution. Moreover, easy-to-use paper test strips for fluorescence detection of phosgene gas had also been prepared. All of this work provided a very promising fluorescent probe for rapid, selective and sensitive detection of phosgene both in solution and in the gas phase.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jinjing Du,Yuehao Guo,JianGuo Zhang,Dongbo Wang,Tao Zhang,Yu Zhou,Yuxiang Yangxuan,Xun Liu,Bin Wang,Qian Li
In this paper, with the goal of developing a high-performance silicon-based negative electrode through a reasonable green design using simple magnesium thermal reduction and pickling combined methods. Specifically, we utilize inexpensive photovoltaic waste silicon mud as the silicon source to synthesize porous silicon. Subsequently, we utilized self-produced porous silicon as the raw material and graphene as the coating material to fabricate a graphene-coated porous silicon-based negative electrode material with excellent cycling stability. We employ the PW91 method, which is based on density functional theory (DFT) using the generalized gradient approximation (GGA), to compute the first principles of both silicon-based materials and graphene-coated silicon/graphene composites. The study revealed that the P-Si@RGO composite exhibited excellent electrochemical properties. When adding 150 mL of graphene oxide with a concentration of 0.2 mg/mL. Even after the 100th cycle at a current density of 100 mA·g −1 , the specific discharge capacity of the P-Si@RGO electrode remains high at 1167.6 mAh·g −1 . At the same time, the results of DFT calculations also show that graphene can improve the conductivity of silicon materials. In summary, the experimental results are consistent with the results of the first-principal calculation, indicating that the computer simulation can predict the accuracy of the experiment, verify the empirical conclusions, and indicate the direction for designing the experimental scheme.
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NANOTECHNOLOGY
·
2024
·Vol. 35
·期 38
·385702
·
IF 2.9
Hai Li,Zhao Li,Jie Qi,Ziyang Wang,Song Liu,Yu Long,Yan Tan
A variety of strategies have been developed to enhance the cycling stability of Si-based anodes in lithium-ion batteries. Although significant progress has been made in enhancing the cycling stability of Si-based anodes, the low initial Coulombic efficiency (ICE) remains a significant challenge to their commercial application. Herein, pitch-based carbon (C) coated Si nanoparticles (NPs) were wrapped by graphene (G) to obtain Si@C/G composite with a small specific surface area of 11.3 m2 g−1, resulting in a high ICE of 91.2% at 500 mA g−1. Moreover, the integrated utilization of graphene and soft carbon derived from the low-cost petroleum pitch strongly promotes the electrical conductivity, structure stability, and reaction kinetics of Si NPs. Consequently, the synthesized Si@C/G with a Si loading of 54.7% delivers large reversible capacity (1191 mAh g−1 at 500 mA g−1), long cycle life over 200 cycles (a capacity retention of 87.1%), and superior rate capability (952 mAh g−1 at 1500 mA g−1). When coupled with a homemade LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode in a full cell, it exhibits a promising cycling stability for 200 cycles. This work presents an innovative approach for the manufacture of Si-based anode materials with commercial application.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Feijing Xu,Nian Yin,Shanjun Gao,Chunhui Shen
Ammonium polyphosphate (APP) and intumescent flame-retardant di-(3-amin-opropyltriethoxysilane) spirocyclic pentaerythritol diphosphate (PDAP) were prepared as an intumescent flame retardant with synergistic effect, and polylactic acid (PLA) was modified by melt blending. The flame retardancy of PLA/PDAP/APP was evaluated by limiting oxygen index (LOI), vertical combustion test (UL-94), and cone calorimetry test (CCT), and the thermal stability of PLA/PDAP/APP was studied by thermogravimetric analysis and thermogravimetry-Fourier transform infrared spectroscopy (FTIR). The possible flame-retardant mechanisms of PLA/PDAP/APP were analyzed based on the results of laser Raman spectroscopy and FTIR. When PDAP:APP = 2:1 and the addition amount of PDAP/APP is 20 wt%, the LOI value of PLA/IFR-modified material is as high as 43%, and the UL-94 test reaches V-0 level, and in the CCT, the PHRR and THR of PLA/PDAP/APP (2:1)-modified material are reduced by 80.7% and 76.8%, respectively, compared with pure PLA, and the carbon residue is as high as 62.01%. The results show that the compound APP/PDAP has an excellent flame-retardant effect on PLA, which provides a good research case for PLA flame-retardant-modified plastic materials.
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Energy Storage Materials
·
2023
·
IF 20.4
Dongmei Zhang,Ruonan Yang,Jianhua Zhou,Wenping Liu,Haiqing Qin,Zhenjun Zhang,Xiaoxu Lei,Anjun Lu,Zuxue Mo,Lei Miao,Feng Dang
The zeolitic imidazolate framework (ZIF) is characterized by a highly ordered structure, large cavities, and thermal/chemical stabilities and has been widely researched for energy storage. In this study, using commercial Si powder with a diameter of 50–200 nm at a kilogram scale, Si@ZIF core-shell particles with dispersed ZIF-8 rhombic dodecahedrons were fabricated by a one-pot method and achieved excellent electrochemical performance. With the specific pore diameter and ordered network formed by membered rings, experimental results demonstrated that the ZIF-8 shell realized a uniform and accelerated Li + diffusion route, alleviated volumetric expansion of the Si core, and constructed a LiF-concentrated robust solid electrolyte interface film with less unnecessary consumption of electrolyte and Li + . Density functional theory calculations verified the higher adsorption energy for Li-solvated clusters and the de-solvation effect on the surface of ZIF-8, which can increase Li + concentration along the one-dimensional channels of 4-membered ring with a diameter similar to that of Li + for high-speed and uniform Li + intercalation. Furthermore, the large and elastic rhombic dodecahedrons formed by pure ZIF-8 buffered the volume change and maintained the integrity of the Si electrode during cycling. As a result, the Si@8Z anode achieved a reversible capacity of 818.5 mAh g −1 after 650 cycles at 1 A g −1 with a high initial coulombic efficiency of 88.2 % and outstanding rater performance even at 8 A g −1 . Nevertheless, the capacity of the Si anode decreased to 0 mAh g −1 after 200 cycles. The present work clarifies the effect of ZIF on the performance of Si anodes and provides a simple method to modify commercial Si powder.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xiaowei Wu,Yuqin Li,Xinwei Chen,Xiaoyan Wang,Jianggui Tan,Tian Gui,Xiangshu Chen,Hidetoshi Kita,Haijiao Xie
Compared with conventional LTA membranes (Si/Al ratio = 1), Si-rich LTA membranes with higher Si/Al ratios are considered to exhibit better hydrothermal stability under high-temperature and water-rich conditions. In this work, high-performance Si-rich LTA membranes were successfully prepared on rough macropore alumina tubes via a hydroxyl radical route in a short synthesis time of merely 8 h. The membrane had the highest Si/Al ratio of 1.63 in the reported LTA membranes. The crystallization processes of Si-rich LTA membranes fabricated with and without hydroxyl radicals were investigated systematically. The role of hydroxyl radicals was detailly discussed by density-functional theory (DFT), SEM, XRD, EDX, EPR, and fluorescence characterizations. Results demonstrated that hydroxyl radicals first promoted the depolymerization of Si substances and then enhanced the Si–O–Si bond formation, thus resulting in an increasing crystallization rate and a higher framework Si/Al ratio of Si-rich LTA membrane. The fabricated Si-rich LTA membrane exhibited outstanding water selectivity with the water content in permeate of exceeding 99.96 wt% and excellent permeation flux of higher than 2.50 kg m −2 h −1 in the case of a 90 wt% EtOH/H 2 O mixture at 348 K. Additionally, the membrane displayed remarkable hydrothermal stability by vapor permeation (VP) test with equimolar of EtOH/H 2 O and MeOH/H 2 O mixtures at a high temperature of 423 K for 120 h, respectively. The Si-rich LTA membranes fabricated with hydroxyl radical showed excellent reproducibility, suggesting that these membranes had a broad promising prospect for separation dehydration of organic solvents even under high-temperature and high-water-content conditions.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
RuoKun Jia,PengPeng Wang,XiaoHang Yang,DuMin Li,JianGuo Qiao,TianXiang Li,JiaHui Chen
The rational modulation of the Si/Al ratio within molecular sieves holds utmost significance for augmenting photocatalytic activity. In this context, g-C 3 N 4 /HBeta composite photocatalysts were synthesised via a straightforward in situ thermal polymerisation procedure employing HBeta molecular sieves possessing multiple active sites and diverse Si/Al ratios. Through the variation of Si/Al ratios, the adsorption capacity, photogenerated carrier complexation efficiency, and active site characteristics could be effectively manipulated. The catalyst with the smallest Si/Al ratio (HBeta 25 ) exhibited the highest catalytic activity, with a hydrogen production efficiency of 2.346 mmol g⁻¹. This value was 4.9 times higher than that of pure g-C 3 N 4 , and the degradation efficiency of RhB was 3 times that of pure g-C 3 N 4 . The catalytic proficiency was principally validated by employing a comprehensive suite of techniques, including XPS, BET, SEM, and NH 3 -TPD. Our results demonstrate for the first time the strong potential of zeolite Si/Al ratio to modulate the catalytic activity of photocatalysts.
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