GREEN CHEMISTRY
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2024
·
IF 9.3
Yuan Qiao,Ali Reza Kamali
Porous structures, such as prous Si electrodes required for high-performance Li-ion batteries, are often produced through envirionmentally problematic processes. In this study, an innovative approach is employed for the green preparation of high-performance porous Si electrodes via thermal treatment of an electrode composed of Si nanoparticles, polyimide (PI), and nanostructured terephthalic acid (TPA). During the process, TPA sublimes at around 318 °C, resulting in a compact yet porous electrode, enhanced by cross-linked PI binder. Moreover, TPA can be regenerated through the condensation of vaporised monomers, supporting a circular economy for the clean preparation of the advanced electrode. Despite the simplicity of this method, the resulting electrode (Si@PI@nano-TPA@E-350) exhibits a remarkable Li-ion storage performance, demonstrating a reversible capacity of 2355 mAh g⁻¹ at 0.2 A g⁻¹ after 120 cycles, along with a reduced charge transfer resistance (Rct) of 99 Ω. This is in contrast to the electrode prepared without TPA (Si@PI@E-350), which only achieves a capacity of 1268 mAh g⁻¹. The morphological features of the TPA used significantly impact the electrode's performance. A full cell composed of Si@PI@nano-TPA@E-350 as the anode and LiFePO₄ as the cathode exhibits a reversible capacity of 151 mAh g⁻¹ relative to the total mass of the anode and cathode at 0.2 A g⁻¹ after 50 cycles, with a capacity retention of 97.8%, demonstrating an enhanced energy density of 455 Wh kg⁻¹. The article presents a green method for sustainably fabricating porous structures for efficient energy storage and a wide range of other applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hui Zhang,Jiatong Li,Yajun Zhu,Xiangbing Zeng,Chengbing Chen,Huigang Zhang,Jinyun Liu
Large theoretical capacity silicon (Si) anode for lithium-ion (Li-ion) battery is hindered by its large volumetric change and structural collapse during cycling. Here, we report a strategy that in-situ embedding Si nanoparticles (Si NPs) into flower-like selenides, then coating with carbon layer, forming a Si@ZnSe/CoSe@C anode. Engineered frame structure provides an optimized condition for alleviating volumetric of Si, and thereby improving stability. Additionally, carbon layer not only immobilize Si NPs, but also improves the conductivity. The Si@ZnSe/CoSe@C anode shows a capacity of 563 mAh g −1 after 150 cycles at 0.1 A g −1 , and a Coulombic efficiency as high as 99.4 % after cycling 800 times at 0.2 A g −1 . A 50 °C-tolerable performance is also obtained, showing a potential for applications. We believe that the composite design presented here offers a general method for developing high-performance energy-storage materials even though they intrinsically have large-volumetric change and low conductivity.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Linfeng Dong,Bohui Xu,Deshuai Xiao,Fan Liu,Xinyuan Zhang,Xuanlin Pan,Pifu Gong,Zheshuai Lin
Optoelectronic materials with excellent birefringent properties are of significant importance in the fields of optical communications and laser technology. Recently, rare earth (RE) chalcogenides with anisotropic [RESn] groups have been proven to be high-performance infrared birefringent materials. Herein, we demonstrate that the addition of planar groups can further increase the birefringence in RE chalcogenides, as realized by incorporating planar [AgS3] groups into the RE-I-IV-S4 family for the first time. The newly obtained LaAgSiS4 compound shows higher polarity anisotropy than its homologue LaLiSiS4 and LaKSiS4, which resulted in a larger birefringence (0.12@600 nm) at least twice as large as that of the latter two compounds (0.05/0.06@600 nm). The structure–property relationship of LaAgSiS4 was investigated through structural analysis and first-principles calculations. The results indicate that the increased optical birefringence in LaAgSiS4 originates from the synergic effects of the distorted [LaSn] polyhedra and planar [AgS3] triangles. This work provides an effective strategy for enhancing optical birefringence in IR chalcogenides.
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Materials Today Communications
·
2024
·
IF 3.7
Hao Chen,Jianjun Chen,Yongwei Lou,Mingming Zhu,Jinxia Li,Jiahao Yang,Hussain Zaheer
SiC nanowire paper composed of SiC nanowires, possesses extensive industrial applications owing to its remarkable properties of low thermal conductivity , fire resistance and foldability. In this work, centimeter-scale SiC nanowires were successfully synthesized via a sol-gel and carbothermal reduction reaction. Subsequently, the simple and convenient traditional handcraft paper-making process enables the non-oriented intertwining of nanowires, forming a paper-like structure. Experimental results show that the thermal conductivity of silicon carbide nanowire paper with a thickness of 0.7 mm is 0.041 W/m∙K at room temperature, which is far lower than that of the traditional porous ceramics because of its nanoporous structure. Moreover, upon heating the nanowire paper to 300 °C, a significant temperature difference of approximately 150 °C was observed between its front and back surfaces, and it was able to withstand the butane flame (∼1300 °C) heat treatment for a long time, which indicated that the nanowire paper had obvious low thermal conductivity, good thermal insulation and refractory properties. These characteristics ensure the promising application of SiC nanowire paper for thermal insulation and fire resistance applications.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanlin Zhang,Dafang He,Junhong Lu,Jie Huang,Haoyang Jiang,Junfeng Rong,Guolin Hou,Haiqun Chen
Silicon (Si) is regarded as the most promising anode candidate for the next high energy density lithium ion batteries (LIBs) owing to its highest theoretical specific capacity and low lithiation potential. However, the practical application of Si-based materials is severely limited due to their enormous volume expansion, which leads to the breakdown of the electrode structure and shortens the cycle life. Herein, we successfully fabricated a free-standing graphene encapsulated silicon nanospheres (Si/rGO) film through homogenizing nano-Si in the lyotropic liquid crystallinity of graphene oxide (GO), followed by coating on the PET substrate and hot pressing technology. For the first time during the preparation process, the dispersion of nano-Si in deionized water was quantitatively characterized through real-time measurements of zeta potential and average particle size. Benefiting from the highly ordered layer-to-layer stacking and dense framework, the as-prepared Si/rGO film shows a high initial discharge capacity of 1727.2 mAh/g at 200 mA/g and superior cycling stability (1024.2 mAh/g over 200 cycles). This straightforward and easy-to-implement method can be used for industrial-scale production through continuous feeding.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yuxiu Yu,Qiang Zhang,Na Teng,Yaodong Liu
Silicon is widely recognized as an exceptionally auspicious anode material for lithium−ion batteries due to its remarkable specific capacity, suitable operational potential, and ecologically innocuous characteristics. This study presents a novel silicon@void@FC (fibrous carbon) composite anode material for lithium-ion batteries. Utilizing a one-step synthesis approach, the resulting hollow core–shell structure, combined with a mesoporous carbon shell, demonstrates exceptional electrochemical performance . The Si@Void@FC electrode exhibits remarkable cycle stability and rate performance, maintaining structural integrity over 500 cycles without observable degradation. The outer carbon shell acts as a protective layer and accommodates silicon volume expansion during cycling, preventing excessive contact with the electrolyte. The rich mesoporous structure facilitates efficient lithium-ion diffusion, enhancing lithiation and delithiation processes. The simplified one-step synthesis method further streamlines the preparation process, eliminating the need for complete silica template formation. This innovative Si@Void@FC composite material holds promise for advancing lithium-ion battery technology, addressing challenges associated with silicon-based anode materials, and offering insights into the design and synthesis of high-performance energy storage materials .
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2025
·
IF 3.3
Zhang Jian,Chen Hongxuan,Pang Xiaotong,Liu Shilong,Misra R. D. K.,Sun Junhao
Currently, surface coatings on agricultural machinery are crucial for extending service life. However, achieving coating strength and toughness remains a challenge. In this paper, two types of high-hardness iron-based coatings, referred as S1 and S2, were prepared by modulating the Mo/V ratio in the Fe-C-V-Mo-B system, and their microstructural evolution and property changes were investigated. The results show that the S1 coating primarily consist of martensitic matrix, spherical VC, blocky Mo 2 B, and a small amount of skeleton-like Mo 2 B. In contrast, the S2 coating consist of martensitic matrix, petal-like VC, and skeleton-like Mo 2 B. Compared with S1, the VC volume fraction in S2 increases by 6.5%, and the Mo 2 B volume fraction increases by 16.3%. The average microhardness of S1 and S2 coatings are 737 HV 0.5 and 954 HV 0.5 , respectively, indicating that the S2 coating exhibits a 22.7% higher microhardness compared with S1. The average friction coefficients of S1 and S2 coatings are 0.434 and 0.398, respectively. Furthermore, the wear loss of S2 coating is approximately half that of S1. The fracture toughness of S1 and S2 coatings are 51.9 MPa·m 1/2 and 51.7MPa·m 1/2 , respectively. Fracture analysis reveals that the skeleton-like eutectic structure in S2 can deflect cracks generated by impact, increase the length of propagation path, and improve the toughness of coating. It allows S2 coating to achieve high hardness and wear resistance, while maintaining toughness comparable to S1 coating. This study provides a theoretical basis for the design and development of iron-based coatings with high hardness, high abrasion resistance, and impact resistance for agricultural machinery.
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Journal of Energy Storage
·
2024
·
IF 8.9
Zhilong Wang,Zhongcheng Li,Yu Wang,Changjun Zhu,Kanghua Chen
Lithium metal anodes are an ideal candidate material for high energy density lithium-ion batteries. However, the uncontrollable growth of lithium dendrites and infinite volume expansion are a big challenge for the commercialization of lithium metal anodes. In order to realize dendrite-free lithium metal anodes, we prepared N-doped carbon/Si nanoparticles composite film modified Ni foam (NFSC) via a simple impregnation-calcination method as a three-dimensional (3D) lithiophilic skeleton for lithium metal anodes. NFSC has several advantages, including a 3D porous conductive structure, a large specific surface area, uniformly distributed abundant lithiophilic nitrogen-containing functional groups and Si nanoparticles providing abundant lithium nucleation sites. This reduces nucleation overpotential, facilitates uniform lithium deposition, suppresses the growth of lithium dendrites, and significantly improves the cycling stability of lithium metal anodes. As a result, NFSC exhibits low nucleation overpotential and the Li||NFSC half-cell maintains a high Coulombic efficiency (CE) of 99.15 % after 1000 cycles at 1 mA cm −2 and 1 mAh cm −2 . Moreover, the NFSC in a symmetric cell exhibits low polarization voltage of 18 mV together with an ultra-long cycling life of over 2000 h at 1 mA cm −2 and 1 mAh cm −2 . Furthermore, the full cell assembled with LiFePO 4 and NFSC@Li demonstrates superior rate performance and excellent long-term cycling stability. The long-term cycling stability exceeds 2500 cycles at 0.5C, far surpassing that of LiFePO 4 ||Li full cell (600 cycles). This work provides a simple and effective approach to achieve dendrite-free lithium metal anodes.
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Heritage Science
·
2024
·Vol. 12
·期 1
·1-11
·
IF 2.6
Liu Yusong,Xu Qingmeng,Li Sifan,Xie Zhenbin,Li Qiang,Luo Hongjie,Ji Shidong
Large amount of ivory was excavated from Sanxingdui site which was waterlogged, severely degraded and in urgent need for conservation. There has been much effort for the conservation of waterlogged ivory by scientists. However, due to a lack of appropriate conservation material and the need to use non-destructive methods, no satisfactory results have been achieved previously. In this work, a novel formulated water-based Al–Si hybrid sol of size about 20 nm was prepared and introduced through a quasi-dynamic equilibrium method to waterlogged ivory tusk for the purpose of conservation. Good conservation performance could be achieved, since Al–Si sol gradually permeates into the interior of the ivory, distributes homogeneously and connects the loose components of ivory. Samples treated with appropriate amount of Al–Si sol displayed satisfactory compressive strength and porous intact structure. It was found that the fluidity of Al–Si sol had a significant influence on the conservation effect. Moreover, Al–Si sol not only consolidated HAP but also worked well on the soil embedded in unearthed ivory, which was beneficial to conserve ivory intactly. Slightly negatively charged Al–Si hybrid gel could interact with ivory matrix through multiple interactions including van der Waals force, electrostatic interaction, chemical and hydrogen bonding.
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NEW JOURNAL OF CHEMISTRY
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2025
·
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).
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Nanomaterials
·
2024
·Vol. 14
·期 20
·1629
·
IF 4.4
Penghui Lei,Qing Chang,Mingkun Xiao,Chao Ye,Pan Qi,Fangjie Shi,Yuhua Hang,Qianwu Li,Qing Peng
A new type of SiCf/TiC-Ti3SiC2composite was prepared by the Spark Plasma Sintering (SPS) method in this work. The phase transformation and interface cracking of this composite under ion irradiation (single Xe, Xe + He, and Xe + He + H ions) and subsequent annealing were analyzed using transmission electron microscopy (TEM), mainly focusing on the interface regions. Xe ion irradiation resulted in the formation of high-density stacking faults in the TiC coatings and the complete amorphization of SiC fibers. The implanted H ions exacerbated interface coarsening. After annealing at 900 °C for 2 h, the interface in the Xe + He + H ion-irradiated samples was seriously damaged, resulting in the formation of large bubbles and cracks. This damage occurred because the H atoms reduced the surface free energy, thereby promoting the nucleation and growth of bubbles. Due to the absorption effect of the SiCf/TiC interface on defects, the SiC fiber areas near the interface recovered back to the initial nano-polycrystalline structure after annealing.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 5
·4179-4189
·
IF 2.019
Han Xiaopeng,Huang Ying,Zhou Suhua,Sun Xu,Peng Xuanyi,Chen Xuefang
Due to the high agglomerate propensity of Si particles, making aluminum composites with a dispersion of the reinforcement using traditional way is still a challenge. In this study, an innovative approach was utilized to prevent the agglomeration of particles using encapsulating graphene sheets by grinding. Afterwards, the milled mixtures were incorporated with Cr-coated graphite flakes, urea and starch via mechanical mixing. After being mechanically mixed and sintered at 330 °C, the porous preform was fabricated by vacuum gas pressure infiltration. Effects of graphene content (0.5, 1, 3, 5 wt%) on the microstructures and properties of thermal and mechanical were investigated. Thermal conductivity and bending strength of the graphite flakes (G f )/Si/Al composites increased by 41.4 and 300%, respectively compared to the specimens without graphene. G f /Si/Al composites with graphene mass fraction of 5% had excellent in-plane thermal conductivity of 346 W/mK and bending strength of 84 Mpa, suggesting the composites can be applied as promising thermal management materials.
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