Catalysts
·
2023
·Vol. 13
·期 6
·969
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IF 3.9
Srinivasan Vinju Vasudevan,Jin Cai,Junming Xu,Hongjian Lin,Hongliang Wang,Quan Bu
In this work, the microwave-assisted reaction of 5-hydroxymethylfurfural (5-HMF) into valuable ether and acylated production formation was investigated with the help of molybdophosphoric acid encapsulated dendritic fibrous silica (KCC-1) as a catalyst. XRD, N2adsorption-desorption, SEM, FT-IR, NH3-TPD, and TEM were used to analyze the physicochemical and structural properties of the synthesized catalysts. The microwave etherification of 5-HMF with ethanol was tested using synthesized catalysts. The effects of the reaction temperature, reaction time, catalytic amount, and microwave power were investigated. The resulting MPA-KCC-1 and IMPA-KCC-1 catalysts demonstrated excellent activity for the etherification of 5-HMF with ethanol, producing 5-(hydroxymethyl) furfural diethyl acetal (HMFDEA) and 5-(ethoxymethyl)furfural diethyl acetal (EMFDEA) products selectively. The significant advantages of the work are the selective production of EMFDEA at 82%, the catalyst can be easily removed via filtration, and the catalyst activity remains nearly intact even after five reaction cycles.Keywords:biomass;acetylation;5-HMF;etherification;heteropolyacid;fibrous silica
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Long-Gui Peng,Hui Wang,Jun Liu,Meng Sun,Fu-Rong Ni,Meng-Jie Chang,Hui-Ling Du,Jie Yang
A novel fibrous BiVO 4 /Bi 2 S 3 /MoS 2 heterojunction is facilely constructed by simple electrospinning and hydrothermal processes. Bi 2 S 3 was formed concurrently along with the hydrothermal synthesis of MoS 2 on to the porous structure of BiVO 4 fibers. The BiVO 4 /Bi 2 S 3 /MoS 2 (BBM) heterojunction is organized with MoS 2 nanosheets of several layers in thickness encapsulating both on the Bi 2 S 3 nanorod around 40 nm in diameter and fibrous BiVO 4 template. The BiVO 4 /Bi 2 S 3 /MoS 2 heterojunction shows significant enhancement of visible light absorption in the region of 500–800 nm and photocurrent of 3 times higher than that of pure BiVO 4 . By adjusting the precursor concentration of MoS 2 , the optimized BBM-2 sample presents 4.9 and 9.5 times higher of the photodegradation efficiency and apparent reaction rate constant respectively, than that of pure BiVO 4 fibers after 120 min under visible light irradiation . The present work will provide a new strategy to the design of Bi-contained nanofibrous heterojunctions with high photocatalytic activity for the applications in energy storage and conversion.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Qiang Zhi,Shan Zhao,Baoqiang Hou,Nanlong Zhang,Feng Li,Bo Wang,Jianfeng Yang
Highly porous Si 3 N 4 ceramics with unidirectionally aligned pore channels are gaining significant attention across various fields due to their outstanding functional capabilities. However, achieving high strength in such unidirectional highly porous Si 3 N 4 ceramics remains challenging. Herein, we design and fabricate a novel β-Si 3 N 4 scaffold composed of directionally aligned lamellar walls with a textured microstructure by directionally freeze casting of α-Si 3 N 4 suspensions with fine elongated β-Si 3 N 4 seeds addition, followed by liquid phase sintering. During the sintering, the scaffold exhibited anisotropic shrinkage, and fibrous β-Si 3 N 4 grains were synthesized through epitaxial growth on the seeds preferentially oriented or the nuclei originated from α-Si 3 N 4 powders, resulting in the grains aligned parallel to lamellar walls and bridged the walls. Seed additions of 7 to 15 wt% were beneficial for the optimized distribution of the two types of β-Si 3 N 4 grains, which contributed to the excellent resistance to bucking-induced fracture for the walls. Compared with other unidirectional porous Si 3 N 4 prepared by freeze-casting in the literature, the Si 3 N 4 scaffold exhibited outstanding compressive strength, ranging from 2.8 to 22.0 MPa, as the porosity decreased from 94.4% to 88.0% and the density increased from 175 to 365 mg/cm 3 . The lightweight and strong Si 3 N 4 scaffolds are promising candidates for engineering applications in harsh environments.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xiaoyang Guan,Bingang Xu,Junxian Huang,Titao Jing,Yuanyuan Gao
The rapid advancement of flexible and stretchable electronics has attracted intensive attention in recent decades. However, challenges still remain in developing wearable and sustainable power sources with comparable portability and stretchability. Here, a novel type of stretchable fiber-shaped triboelectric nanogenerator (AXF-TENG) was fabricated by inserting a negative Poisson-ratio auxetic fiber into a positive Poisson-ratio hollow circular sleeve, forming a synergistic structured TENG composed of opposite Poisson's ratios. Owing to the advanced structural designs, the inner auxetic fiber would expand in all directions to more effectively contact with the shrunk outer steel wire sleeve under stretching. The peak-to-peak voltage and transfer charge of composite based AXF-TENG could reach up to 42 V and 12.5 nC, respectively. The fabricated AXF-TENG can be used as a self‐powered multifunctional sensor to detect human motions and be woven into an energy‐harvesting fabric to scavenge biomechanical energy. With open-circuit voltage of 46 V and maximum instantaneous power density of 52.36 mW/m 2 , the AXF-TENG fabric was capable of lighting up 20 light emitting diodes (LEDs), charging commercial capacitors, powering an electronic watch and a calculator. All of these merits of the proposed AXF-TENGs suggest their promising potentials for versatile applications in biomechanical energy harvesting and self-powered sensing.
研究领域:
材料科学
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能源技术
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3297
·
IF 5.719
Yihan Qiu,Xiaoyu Jia,Mei Zhang,Hongwei Li
Fiber-shaped supercapacitors are promising and attractive candidates as energy storage devices for flexible and wearable electric products. However, their low energy density (because their microstructure lacks homogeneity and they have few electroactive sites) restricts their development and application. In this study, well-distributed polyaniline/graphene composite fibers were successfully fabricated through a new strategy of self-assembly in solution combined with microfluidic techniques. The uniform assembly of polyaniline on graphene oxide sheets at the microscale in a water/N-methyl-2-pyrrolidone blended solvent was accompanied by the in situ reduction of graphene oxides to graphene nanosheets. The assembled fiber-shaped supercapacitors with gel-electrolyte exhibit excellent electrochemical performance, including a large specific areal capacitance of 541.2 mF cm−2, along with a high energy density of 61.9 µW h cm−2at a power density of 294.1 µW cm−2. Additionally, they can power an electronic device and blue LED lights for several minutes. The enhanced electrochemical performance obtained is mainly attributed to the homogeneous architecture designed, with an increased number of electroactive sites and a synergistic effect between polyaniline and graphene sheets. This research provides an avenue for the synthesis of fiber-shaped electrochemically active electrodes and may promote the development of future wearable electronics.Keywords:polyaniline;graphene;composite fibers;energy density;fiber-shaped supercapacitors
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
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2023
·
IF 6
Chuanyun Zhao,Chenyang Zhang,Peng Wang,Ziwei Chen,Yuhang Wang,Jiadeng Zhu,Chunxia Gao,Qiang Gao
Wet-spinning technology plays an essential role in the development of wearable electronics. Poly(3,4-ethylene dioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) fibers have been widely investigated in this field due to their advantages of being environment-friendly and low-cost. They are mainly wet-spun from a coagulation bath containing ethanol and water with additional metal salts. However, the conductivity of PEDOT: PSS fibers spun by this method is low. Here, we propose a novel coagulation bath made of ionic liquid (IL), ethanol, and water, and the resultant PEDOT: PSS fibers could achieve a conductivity of 118.3 S·cm −1 . Furthermore, the fiber-shaped supercapacitor prepared by such PEDOT: PSS/IL fibers reveals an optimal capacitance retention rate of 97 % even after 10,000 cycles, and the capacitance loss of the supercapacitor is only 7 % at −20 ℃. The sensor derived from the PEDOT: PSS/IL fibers has superb sensing capability, indicating their promising applications for wearable electronics.
研究领域:
材料科学
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电子工程
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可穿戴设备
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
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2023
·Vol. 34
·期 7
·1-13
·
IF 3.7
Feng Jianlang,Liu Junjie,Wang Yingqu,Diao Jingjing,Kuang Yudi,Zhao Naru
The design of hierarchical porous structure in scaffolds is crucial for bone defect regenerative repair. However, bioceramic materials present a challenge in precisely constructing designed micropores owing to the limitation of forming process. To investigate micropore shape influences bone regeneration in bioceramic scaffolds with macropores, hierarchical porous scaffolds with interconnective macropores (~400 μm) and two types of micropores (spherical and fibrous) were prepared using a combination of direct ink writing (DIW) and template sacrifice methods. Compared to the scaffold with spherical micropores, the scaffold with highly interconnected fibrous micropores significantly improved cell adhesion and upregulated osteogenic and angiogenetic-related gene expression in mBMSCs and HUVECs, respectively. Furthermore, in vivo implantation experiments showed that hierarchical scaffolds with fibrous micropores accelerated the bone repair process significantly. This result can be attributed to the high interconnectivity of fibrous micropores, which promotes the transportation of nutrients and waste during bone regeneration. Our work demonstrates that hierarchical porous scaffold design, especially one with a fibrous micropore structure, is a promising strategy for improving the bone regeneration performance of bioceramic scaffolds. Graphical Abstract
研究领域:
生物材料学
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组织工程
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骨科医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Xing Gao,Lei Liu,Lei Zu,Huiqin Lian,Xiuguo Cui,Xiaodong Wang
A facile dual-temperature zone heating strategy has been developed to fabricate fibrous phosphorus (FP) through bottom-up growth with the aid of the Sn 24 P 19.3 I 8 catalyst. The resultant FP exhibits a high purity of over 99 % and a unique long-term ordering lamellar structure . The as-prepared FP is further mixed with graphite (G) to construct a FP-G composite anode for lithium-ion batteries (LIBs). Compared to conventional crystalline red phosphorus , the developed FP shows higher conductance, smaller lateral dimensions, shorter Li + transport distance, and faster ion diffusion. This ensures that the FP-G anode gains high rate performance and long cycle life for LIBs. The FP-G anode not only exhibits a high specific capacity of 1533.2 mA h g −1 at 0.5 A g −1 but also presents a high retention capacity of 1048.4 mA h g −1 at a high current density of 4.0 A g −1 after 1300 charge/discharge cycles, indicating a high cycle stability and fast reaction kinetics. Such outstanding characteristics are attributed to the unique lamellar fibrous texture and high aspect ratio of the developed FP, which provides more active sites and structural stability for the electrode material . This study provides a new approach for developing phosphorus-based electrode materials and expands their application range in LIBs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 9
·3636-3645
·
IF 6.482
Xiaoqin Li,Taotao Gao,Qilin Liu,Yanxue Xu,Jing Li,Dan Xiao
Fiber-shaped energy storage devices (FESDs) are indispensable for developing portable and wearable electronic products. Aqueous rechargeable Ni/Fe batteries are an appropriate candidate due to the cost-effectiveness, high ionic conductivity, and great safety. However, their energy density is still far from satisfactory, hindering further practical applications. Herein, we focused on studying binder-free fibrous electrodes for high-performance FESDs based on rechargeable Ni/Fe batteries. A fast microwave-assisted synthesis method was adopted to grow active materials with a 3D conductive network which is constructed from carbon nanotubes decorated with Fe–Fe3C nanoparticles. Due to the heterogeneous structure, the active materials depicted improved electron/ion transfer, boosting the electrochemical performance of the anode. A flexible Ni/Fe battery is successfully fabricated using the aforementioned anode coupled with a NiCoO-based cathode which is synthesized by electrodeposition and a post-annealing process. Thanks to the special structure of the active materials and the fast redox reaction, the assembled flexible Ni/Fe battery achieved high electrochemical properties with a maximum volumetric specific capacity of 1.61 mA h cm−3 and energy density of 1.28 mW h cm−3. The cycling stability and mechanical flexibility were also tested, which demonstrated the prospects for practical application.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 307
·期 1
·2100631
·
IF 4.367
Jinyun Wang,Tong Su,Wei Zhuang,Cheng Shi,Min Gao,Xiao Wu,Cong Lin,Tengfei Lin
The properties of polymer blends strongly depend on their microstructure. Thus, tuning the phase structure and improving the interfacial interaction of blends are relatively crucial. Inspired by the breaking and reformation of dynamic covalent bonds in vitrimers, these special bonds are introduced into the phase interface of polymer blends in this work. Through reactive blending of epoxidized natural rubber (ENR), polylactic acid (PLA) and additives, polymer blends with dynamic interfacial cross-linking are fabricated. The prepared blends with intensive interfacial interactions display excellent recycling capacity. Strikingly, after etching the dissolvable substances with a solvent, the porous phase structure of original polymer blends changes to a fiber-like phase structure of the third recycled blends, entirely distinct from most reported phase structures in polymer blends. In addition, the composites show great enhancements in mechanical properties during recycling. This work provides an effective method to tune the phase structure and improve the interfacial interaction of polymer blends.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Yuefei Zou,Wanlin Wu,Tian Xia,Jiangqi Zhao,Qunhao Wang,Wei Zhang,Canhui Lu
To keep pace with the fast development of portable and wearable electronics, considerable public and scientific attentions have been paid to the flexible energy storage devices with characteristics of light weight, low cost and high electrochemical performance. In this work, we demonstrate a feasible strategy to fabricate novel strand-shaped electrodes from the biomass of Juncus effusus (JE), which can be easily integrated into flexible and rechargeable Zn-MnO 2 batteries with high electrochemical performance. Notably, JE has a very unique three dimensional (3D) triangular-like hollow network microstructure, which greatly favors active material loading, charge transfer and ion diffusion. The obtained aqueous battery presents an excellent specific capacity of 325 mAh g −1 at the current density of 0.3 A g −1 , as well as stunning cycling stability for up to 4000 cycles with 127.53 % retention of the initial capacity. Remarkably, when assembled with a gel electrolyte, the quasi-solid-state battery can work normally under various extreme conditions, including bending, hammering, burning, soaking and puncturing. In addition, due to the high flexibility, the electrodes can be woven in parallel into a textile to form an energy supply unit and successfully power an electronic watch, demonstrating high potential of JE in the fabrication of flexible energy storage devices.
研究领域:
材料科学
·
能源存储
·
可持续发展
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Wen Zhang,Meisheng Li,Jie Wang,Yijiang Zhao,Shouyong Zhou,Weihong Xing
New heterogeneous poly(ionic liquids) catalysts (PAL-PILs) were successfully prepared by grafting polymerization of acid ionic liquids (ILs) (1-butysulfonate-3-vinylimidazole hydrogen sulfate) onto nanofiber-like palygorskite (PAL) supports that had been, in advance, covalently modified by γ-methacryloxypropyl trimethoxy silane (OPAL). Using the ester yields and PILs grafting degrees as main indexes, the optimized immobilization conditions were that the mass ratio of OPAL to ILs monomer was 1:2, the immobilization temperature and time were 60 °C and 30 h, the initiator (2,2′-Azobis(2-methylpropionitrile) dosage was about 5 wt%, respectively. Then, the esterification between methanol and oleic acid was carried out to investigate the catalytic properties of PAL-PILs. For the homogeneous ILs catalyst, the yield of methyl oleate was about 85%. For the PAL-PILs, on which only about 41% of ILs used in homogeneous catalysis was immobilized, the yield could reach over 69% after reacting only 5 h at 75 °C at atmospheric pressure, when the molar ratio of methanol to oleic acid is adjusted to 12:1. More importantly, the yield of methyl oleate still maintained at about 22% after 6 recycling experiments. Moreover, the PAL-PILs catalysts exhibited efficient catalytic properties and could be recycled easily. These results offer great potential for the PAL-PILs in the biodiesel production for further research.
研究领域:
化学工程
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催化材料
·
可再生能源
✓ 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）