RARE METALS
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2025
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IF 11
Liu Lang,Zhang Qian,Han Guangrui,Zhang Mengjie,Song Xinyu,Xiao Hong,Hou Linrui,Jiang Ruiyu,Yuan Changzhou
Si, as the most promising anode with high theoretical capacity for next-generation lithium-ion batteries (LIBs), is hampered in commercial application by its poor electrical conductivity and significant volume expansion. Herein, the core-shell Si@SiO x /C@C-Ar (SSC-A) or Si@SiO x /C@C-H 2 /Ar (SSC-H) composites are purposefully designed by in situ introduction of inorganic SiO x in pure Ar or H 2 /Ar atmosphere to realize a Si-based anode for LIBs. By introducing different atmospheres, the valence states of SiO x are regulated. The inorganic transition layer formed by the combination of SiO x with higher average valence and asphalt-derived carbon demonstrates better performance in both stabilizing the core-shell structure and inhibiting the agglomeration of Si particles. Given these advantages, the SSC-A electrode exhibits excellent electrochemical performance (1163 mAh g −1 after 400 cycles at 1 A g −1 ), and the commercial blended graphite-SSC-A electrode reaches a specific capacity of 442 mAh g −1 with 74.8% capacity retention under the same conditions. Even the SSC-A electrode without Super P maintains an ultrahigh discharge specific capacity of 803 mAh g −1 with 60.6% after cycling. Importantly, the full batteries based on SSC-A without Super P achieve a discharge specific capacity of 126 mAh g −1 with 28.2% capacity decay after 200 cycles, demonstrating the superior commercial application potential.
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高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Ali Hammad,Siyi Zou,Fandi Ning,Ghulam Nabi,Yuzhuo Jiang,Bin Tian,Wentao Huang,Muhammad Rashid,Shiqi Zhao,Xiaochun Zhou
Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues. CaH 2 /(Al/Si) composites are preferable due to their notable chemical properties. However, these composites require pretreatments, an inert environment, and long hours of physical ball milling for high homogeneity and synergistic effects. CaH 2 also inhibits the hydrolysis reaction by forming its products on the Al/Si surface, which hinders the direct utilization of composites. This work represents the first investigation of NaH-CaH 2 (Al/Si) fuel composites, which greatly overcome these limitations and can be directly used for on-site hydrogen generation and proton exchange membrane (PEM) fuel cells. The NaH-CaH 2 (Al/Si) fuel composites were prepared by using a straightforward mixing method with variable composition ratios, showing high H 2 yield and fuel cell (FC) performance. NaH addition provides the bridge effect, which opens up a new way to enable efficient hydrolysis and greatly enhances the hydrolysis activity of CaH 2 /(Al/Si) composites. The novel fuel composites (NaH-CaH 2 /Al) have extraordinary FC performance and a 0.42 W/cm 2 peak power density greater than commercial hydrogen generators. It provides high H 2 yield 84.4 % for NaH-CaH 2 /Al and 82 % for NaH-CaH 2 /Si compared to NaOH-CaH 2 (Al/Si), NaCl-CaH 2 (Al/Si), and KCl-CaH 2 (Al/Si) composites. The NaH bridge effect hinders the direct water contact and stops the formation of Ca(OH) 2 around Al/Si, which provides adequate pathways for the CaH 2 (Al/Si) hydrolysis. The impressive capabilities of novel fuel composites are anticipated to offer practical uses in fuel cells, automobile applications, and portable/on-board H 2 generation.
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高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Song Zhang,Yang Shen,Peng Qiu,Mengjia Fang,Peichuang Li,Xiangning Du,Zhengying Deng,Wanhao Cai,Hui-Li Wang
The specific binding capacity between chitosan and heavy metal ions is critical in food safety, which is closely regulated by its degree of deacetylation (DD). However, the underlying mechanism governing the impact of DD remains unclear. Here we employ a combination of experiments and simulations to study the interaction between chitosan and Pb 2+ across multiscale at different DD. At the molecular level, Pb 2+ can chelate individual chitosan chains simultaneously via multiple interaction sites, which is enhanced with rising DD and leads to more ordered molecular packing. This molecular arrangement then develops to a nanoscale aggregation process, where the aggregation size, rate, and mechanical stability all show a positive correlation with DD. Such aggregation ultimately leads to enhanced macroscale structures, where the strain and tensile stress are significantly increased by 2 to 3-folds and further rises with increasing DD. These observed effects are governed by a unified mechanism: deacetylation introduces more amino groups that serve as stronger chelation sites than acetyl groups, thereby enhancing Pb 2+ binding across length scales. These findings provide foundation for the development and application of chitosan in the food industry, such as food preservation, anti-heavy-metal packaging, and food purification.
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高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Wenkang Wang,Xin Hu,Zongtao Qu,Yao Dai,Shushen Lyu
Silicon anodes are regarded as one of the most promising alternatives to commercial graphite anodes due to their exceptionally high theoretical specific capacity (4200 mAh g −1 ). However, their widespread application is currently hindered by challenges such as significant volume expansion (>300 %), an unstable solid electrolyte interphase (SEI) layer, and poor electrical conductivity. To address these limitations, this study introduces a novel covalent–hydrogen bonding dual-network binder (Si@PCG) for silicon anodes, composed of the highly polar biomolecule chondroitin sulfate (CS), the ionic conductor polyethylene oxide (PEO), and conductive graphene oxide (GO). Compared to conventional binders such as PVDF (initial Coulombic efficiency, ICE: 32.8 %) and CMC (ICE: 82.3 %), the Si@PCG anode achieves significantly higher ICE (89.7 % at 0.01–1.5 V and 92.3 % at 0.01–3 V). Additionally, the PCG binder exhibits strong interfacial adhesion and lower hardness, enabling its elastic dual-network structure to efficiently dissipate stress caused by silicon volume expansion. This results in outstanding structural stability, reflected in a remarkably low thickness increase of only 5.49 % after 100 cycles. Furthermore, the PCG binder promotes the formation of a LiF-rich inorganic SEI layer, which further stabilizes the interface and enhances long-term cycling. The Si@PCG anode exhibits excellent ICE, high rate capability, and superior cycling performance in both half-cell and full-cell configurations. These results demonstrate a simple and scalable strategy for developing high-performance binders for silicon anodes and advance the practical application of lithium-ion batteries.
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高影响因子
MATERIALS CHARACTERIZATION
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2025
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IF 5.5
Yaju Zhou,Jingyi Zhou,Weiwei Zhang,Jianglei Fan,Shen Wu,Xiuqing Li,Shizhong Wei
Oxide dispersion strengthened (ODS) Cu alloy is a kind of structural material with high thermal conductivity and high stability. It is promising to maintain mechanical integrity under thermal conductivity and high temperature conditions. These excellent properties are directly or indirectly attributed to the ultra-high number density of nano oxide particles, which act as a strong barrier for grain growth, dislocation slip and grain boundaries (GBs) slip. In this study, Cu-Cr-Y-Al-Ti-Si and ODS Cu-Cr-Y-Al-Ti-Si alloys were prepared by combining mechanical alloying with spark plasma sintering (SPS) technology. The influence of Cu 2 O on the microstructure, mechanical properties, and thermal stability of the Cu-Cr-Y-Al-Ti-Si alloy were investigated. Both alloys exhibited a heterogeneous mixture of coarse and fine grain structures. However, the addition of Cu 2 O led to grain refinement and the precipitation of a high density of uniformly distributed, nano-sized oxide particles throughout the copper matrix. Compared to the Cu-Cr-Y-Al-Ti-Si alloy, the ultimate tensile strength of the ODS Cu-Cr-Y-Al-Ti-Si alloy escalated from 409 MPa to 482 MPa, while the elongation slightly decreased from 17.2 % to 15.2 %. The ODS CuCrYAlTiSi alloy also demonstrates a room temperature thermal conductivity equivalent to 62.8 % of pure copper, and exhibits ultra-high microstructural stability after annealing at 600 °C for 100 h. The outstanding strength, ductility and high-temperature stability are primarily owing to the coherent nano-sized Y-X-O (X = Al, Ti, Si) particles dispersed in the ultra-fine grain copper matrix. These findings indicate that by integrating component design and process optimization, it is possible to effectively and efficiently produce ODS CuCrYAlTiSi alloy, which holds promising application prospects in structural materials for nuclear fusion reactors.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yongsheng Liu,Guoxin Wei,Yawen Ma,Pengcheng Ma,Jianyong Tu,Jingxin Li,Yansong Liu,Shaolin Fu,Yejie Cao,Jian Chen,Yu Pan
In response to the urgent demand for ablation resistance and cost-effective thermal protection materials for hypersonic vehicles, this study employed a combined process of slurry injection and reactive melt infiltration to rapidly fabricate C f /ZrB 2 ‒SiC composites. The effects of infiltration temperature (1450°C‒1600°C) and holding time (0.5‒2.0 h) on the microstructure and mechanical properties were systematically investigated. Results demonstrate that at 1500°C, the competition mechanism between molten Si viscosity and reaction rate was balanced, achieving efficient pore filling. Composites processed at 1500°C for 1 h exhibited optimal mechanical properties, with a flexural strength of 234.08 MPa. As the holding time increased, elemental homogeneity improved in the matrix while mechanical properties decreased. The oxyacetylene ablation test (4.18 MW/m 2 ) showed: at 100 s, a dense ZrO 2 ‒SiO 2 oxide layer formed, resulting in ablation rates of 0.32 mg/s and 0.70 µm/s. After 300 s, thermal stress caused oxide layer spallation, elevating rates to 2.90 mg/s and 4.50 µm/s, triggering a new ablation cycle. The material demonstrates exceptional ablation resistance. This process provides a valuable reference for the low-cost fabrication of high-performance ultra-high temperature ceramic matrix composites.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Sinian Jiang,Bin Zhang,Xinyu Liu,Jingchun Cao,JunJie Ge,Kexin Men,Yuxiong Jiang,Xiaocong Wang
As a promising anode for lithium-ion batteries (LIBs), silicon (Si) has been studied due to its high specific capacity. However, significant volume change during charge-discharge process has seriously impeded its practical application. Compounding with carbon is one of the methods to solve this problem. In this paper, biomass carbon is prepared by high temperature carbonization of Chinese rose petals. Different mass ratios of Si nanoparticles are embedded in the biomass carbon to produce C@Si composites. The as-prepared C@Si composites are assembled into LIBs to investigate their electrochemical performance. As an anode material for LIBs, the manufactured C@Si composite material (Si-25 wt%) manifests a stable cycling performance (524 mAh•g −1 at 0.1 A•g −1 after 100 cycles), a long cycle life (581 mAh•g −1 at 1 A•g −1 after 400 cycles) and excellent rate capability. And its initial coulombic efficiency at the current density of 1 A•g −1 (99.62 %) is much larger than that of pure nano-Si (29.45 %). The electrochemical impedance spectroscopy (EIS) results indicate that the C@Si composite materials can behave as an ideal capacitor. This study reveals the possibility of changing flower petals to carbon material and the potential applications in the field of LIBs.
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高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Xuannuo Yi,Shasha Liu,Taotao Zhao,Xiangke Guo,Kai Zhou,Weiping Ding,Wei Wang
Zeolites are essential solid acid catalysts in various chemical processes. Temperature-programmed desorption (TPD) is one of the most established techniques used to characterize the acidity of zeolites by measuring the desorption kinetics of probes from bulk samples. However, conventional TPD can hardly deliver the intrinsic acid properties of zeolites because the apparent desorption kinetics are inevitably mixed with mass transfer and thermal conduction due to the large sample amount (∼0.1 g). Herein, we developed an optical microscopy approach to measure the TPD spectra of single zeolite nanoparticles, termed oTPD, by in situ monitoring of the reduced scattering intensity of individuals as a result of the desorption of probe molecules during heating. A significantly reduced sample amount contributed to the oTPD spectrum, revealing an intrinsic desorption temperature of ∼300 °C lower than the apparent value and also a greatly narrowed peak width from ∼150 to ∼15 °C. Correlating oTPD and micro-Raman spectra of the very same individuals further uncovered a linear dependence between the acidity and the content of silicon islands. This study provided unprecedented capabilities for measuring the intrinsic acid properties and the desorption kinetics of single zeolite nanoparticles, with implications for better understanding the structure–acidity relationship and for designing better zeolite catalysts.
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PubMed
高影响因子
Coatings
·
2024
·Vol. 14
·期 9
·1210
·
IF 2.9
Songjia Kong,Chenguang Liu,Jiawei Ren,Tianchang Wang,Xianwei Geng,Yudan Yuan,Chun Zhao,Cezhou Zhao,Li Yang
Silicon is a promising anode material for high-performance lithium-ion batteries (LIBs), but its rapid capacity degradation has significantly hindered its large-scale application. In this study, we propose an in situ self-assembly polymerization method to fabricate a stable silicon-based anode by leveraging electrostatic self-assembly technology, in situ esterification, and amidation reactions. The incorporation of a cross-linked polymer, combined with the synergistic effects of electrostatic interactions between negatively charged MXene and positively charged silane-coupling-agent-modified silicon, offers a novel strategy for enhancing the electrochemical performance of LIBs. Notably, annealed electrodes with a 65 wt% nmSi-NH2/MXene ratio demonstrate outstanding electrochemical performance, achieving a capacity of 929.5 mAh g⁻¹ at a current density of 1 A g⁻¹ after 100 charge/discharge cycles. These findings suggest that the integration of cross-linked polymers and electrostatic self-assembly can significantly improve the intercalation and overall electrochemical performance of silicon anodes in lithium-ion batteries.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
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IF 3.7
Yu Zhang,Pengliang Gu,Shiyue Zhang,Yanan Xu,Xinyi Fu,Wenkai Wang,Qing Hu,Hao Li,Zhan Shi,Hongbin Du
Si materials possess a high theoretical specific capacity when used as anode material in lithium-ion batteries (LIBs). Si/C composites mitigate volume expansion and enhance conductivity, thus achieving improved electrochemical performance in LIBs. Herein, we report a new strategy for preparing pomegranate-like Si/C nanocomposites based on low-cost, readily available conductive carbon black (XC) by using a combination of wet chemical reduction and chemical vapor deposition (CVD) techniques. The preparation first involves a facile wet chemical approach to controlled hydrolysis of SiCl 4 within XC. Subsequently, the obtained SiO 2 /XC precursor is reduced to highly crystalline Si particles within XC (Si/XC) using a novel ionic liquid-magnesium reduction system, avoiding unwanted byproducts associated with conventional high-temperature magnesium reduction. Finally, a pomegranate-like Si/XC composite is coated with an outer carbon layer via CVD, forming a nano-confined Si/C structure. The composites exhibit excellent reversible capacity and good cycle stability in LIBs. At 1 A g −1 after 400 cycles, the Si/XC@C-0.5 composite delivered the highest specific capacity of 835 mA h g −1 , exhibiting a capacity retention rate of 121% compared to the first cycle after activation (688 mA h g −1 ). This work provides reproducible and scalable means to prepare high-performance Si/C composites for LIBs. Graphical We report a new strategy to prepare a pomegranate-like nano-confined silicon-carbon composites with excellent performance through a combination of wet chemical reduction methods and chemical vapor deposition (CVD) technique. The Si/XC@C-0.2 electrode exhibited a capacity retention rate of 157.7% after 400 cycles at a current density of 1 A g −1 , while the Si/XC@C-0.5 electrode achieved the highest capacity after 400 cycles, reaching 835 mA h g −1 .
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高影响因子
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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高影响因子
Advanced Powder Materials
·
2024
·
IF 28.6
Ziming Ye,Yi Zeng,Xiang Xiong,Sen Gao,Chen Shen,Shiyan Chen,Tianxing Jiang,Ge Yang
Multiphase design is a promising approach to achieve superior ablation resistance of multicomponent ultra-high temperature ceramic (UHTC), while understanding the ablation mechanism is the foundation. Here, through investigating a three-phase multicomponent ceramic consisting of Hf-rich carbide, Nb-rich carbide, and Zr-rich silicide phases, we report a newly discovered solid-state reaction process among multiphase multicomponent ceramic during ablation. It was found that this solid-state reaction occurred in the matrix/oxide scale interface region. In this process, metal cations are counter-diffused between the multicomponent phases, thereby resulting in their composition evolution, which allows the multicomponent phases to exist stably under a higher oxygen partial pressure, leading to the improvement of thermodynamic stability of three-phase multicomponent ceramic. Additionally, this solid-state reaction process appears synergistic with the preferential oxidation behavior among the oxide scale in enhancing the ablation performance.
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高影响因子
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