Journal of Energy Chemistry
·
2019
·
IF 5.162
Meng Zhang,Xuezhang Xiao,Bosang Luo,Meijia Liu,Man Chen,Lixin Chen
Magnesium hydride has been seen as a potential material for solid state hydrogen storage , but the kinetics and thermodynamics obstacles have hindered its development and application. Three-dimensional flower-like TiO 2 @C and TiO 2 were synthesized as the catalyst for MgH 2 system and great catalytic activities are acquired in the hydrogen sorption properties. Experiments also show that the flower-like TiO 2 @C is superior to flower-like TiO 2 in improving the hydrogen storage properties of MgH 2 . The hydrogen desorption onset and peak temperatures of flower-like TiO 2 doped MgH 2 is reduced to 199.2 °C and 245.4 °C, while the primitive MgH 2 starts to release hydrogen at 294.6 °C and the rapid dehydrogenation temperature is even as high as 362.6 °C. The onset and peak temperatures of flower-like TiO 2 @C doped MgH 2 are further reduced to 180.3 °C and 233.0 °C. The flower-like TiO 2 @C doped MgH 2 composite can release 6.0 wt% hydrogen at 250 °C within 7 min, and 4.86 wt% hydrogen at 225 °C within 60 min, while flower-like TiO 2 doped MgH 2 can release 6.0 wt% hydrogen at 250 °C within 8 min, and 3.89 wt% hydrogen at 225 °C within 60 min. Hydrogen absorption kinetics is also improved dramatically. Moreover, compared with primitive MgH 2 and the flower-like TiO 2 doped MgH 2 , the activation energy of flower-like TiO 2 @C doped MgH 2 is significantly decreased to 67.10 kJ/mol. All the improvement of hydrogen sorption properties can be ascribed to the flower-like structure and the two-phase coexistence of TiO 2 and amorphous carbon . Such phase composition and unique structure are proved to be the critical factor to improve the hydrogen sorption properties of MgH 2 , which can be considered as the new prospect for improving the kinetics of light-metal hydrogen storage materials.
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高影响因子
RARE METALS
·
2024
·Vol. 43
·期 5
·2067-2079
·
IF 9.6
Wang Dan,Ma Qun,He Huan,Wang Zhi-Yuan,Zheng Run-Guo,Sun Hong-Yu,Liu Yan-Guo,Liu Chun-Li
Antimony-based materials with high capacities and moderate potentials are promising anodes for lithium-/sodium-ion batteries. However, their tremendous volume expansion and inferior conductivity lead to poor structural stability and sluggish reaction kinetics. Herein, a double-confined nanoheterostructure Sb/Sb 2 S 3 @Ti 3 C 2 T x @C has been fabricated through a solvothermal method followed by low-temperature heat treatment. The dual protection of “MXene” and “carbon” can better accommodate the volume expansion of Sb/Sb 2 S 3 . The strong covalent bond (Ti–S, Ti–O–Sb, C–O–Sb) can firmly integrate Sb-based material with Ti 3 C 2 T x and carbon, which significantly improves the structure stability. In addition, the carbon layer can restrain the oxidation of MXenes, and the nano-Sb/Sb 2 S 3 can facilitate electron/ion transport and suppress the restacking of MXenes. The heterogeneous interface between Sb and Sb 2 S 3 can further promote interfacial charge transfer. The MXene-Sb/Sb 2 S 3 @C-1 with the optimal Sb content shows high specific capacities, comparable rate properties and ultra-stable cycling performances (250 mAh·g −1 after 2500 cycles at 1 A·g −1 for sodium-ion batteries). Ex situ X-ray diffractometer (XRD) test reveals the storage mechanism including the conversion and alloying process of MXene-Sb/Sb 2 S 3 @C-1. Cyclic voltammetry (CV) test results demonstrate that the pseudocapacitance behavior is dominant in MXene-Sb/Sb 2 S 3 @C-1, especially at large current. This design paves the way for exploring high-performance alloy-based/conversion-type anode for energy storage devices. Graphical abstract
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高影响因子
NANO
·
2024
·
IF 1
Xiaoying Lin,Xiuchun Fan,Lifang Xu,Hao Lin,Qinhua Zhong
A porous carbon material (Mg-MOF-C) was prepared by carbonization in the N 2 atmosphere using Mg-MOF-74 as the precursor. Physicochemical properties of Mg-MOF-C materials were well characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FIRT), Thermogravimetric analyzer (TG), transmission electron microscope (TEM), energy dispersive spectrometer (EDS), N 2 adsorption/desorption isotherms (BET) and EDS. The adsorption properties of the products were studied Mg-MOF-C has a high specific surface area of up to 1739.29 m 2 /g, and the pore volume of micropores was 0.98 m 3 /g. Besides, 95% of the first adsorption is retained after five cycles. The adsorption processes agreed well with the pseudo-second-order kinetic model and Langmuir isotherm model.
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Functional Materials Letters
·
2019
·
IF 1.388
Yue Lu,Peng Chang,Libin Wang,Joseph Nzabahimana,Xianluo Hu
Silicon (Si) has been considered as one of the most promising anode materials in lithium-ion battery. However, practical applications of Si are hindered by undesirable cycling stability resulting from poor electrical conductivity and huge volumetric change during cycling process. Here, we prepared a yolk-shell silicon/carbon composite by etching carbon-coated heat-treated silicon monoxide (SiO) precursor. The as-prepared Si/SiO x @Void@C composite of inner silicon/silicon oxides and outer carbon shell with voids between them (Si/SiO x @Void@C), shows impressive cycling stability (1020 mAh g − 1 at 1 A g − 1 over 200 cycles) and excellent rate performance (775 mAh g − 1 at 6 A g − 1 ). The remarkable electrochemical performance is due to the enhanced electrical conductivity originated from the carbon shell and the volume buffer effect of the yolk-shell structure. A combination of the yolk-shell structure with Si/C composites is believed to be a promising way to improve the performance of Si-based materials in lithium-ion batteries.
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高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2014
·Vol. 30
·期 9
·1667-1673
·
IF 0.886
XUE Qing-Rui,LI Jian-Ling,XU Guo-Feng,HOU Peng-Fei,YAN Gang,DAI Yu,WANG Xin-Dong,GAO Fei
A lithium-rich solid-solution layered cathode material, Li[Li0.2Mn0.54Ni0.13Co0.13]O2, was synthesized using a fast co-precipitation method, and surface modified withAg/C via chemical deposition. The electrochemical properties,
structures, and morphologies of the prepared samples were investigated using X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), galvanostatic charge-discharge cycling, cyclic voltammetry (CV), electrochemical impedance
spectra (EIS), and energy dispersive X-ray spectroscopy (EDS). The XRD results showed that the pristine and Ag/Ccoated cathode materials both have hexagonal α-NaFeO2 layered structures with the R3m
space group. Microscopic morphological observations and EDS elemental mapping showed that a uniform Ag/C coating layer of thickness 25 nm was deposited on the surfaces of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 particles. The Ag/C-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2
material gave an excellent electrochemical performance. The initial discharge capacity (0.05C) of the Ag/C- coated sample was 272.4 mAh ·g-1, with an initial coulombic efficiency of 77.4%, corresponding to 242.6 mAh·g-1 for the pristine sample, with an initial
coulombic efficiency of 67.6%, in the potential range 2.0-4.8 V (vs Li/Li+). After 30 cycles (0.2C), the Ag/C-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 retained a capacity of 222.6 mAh·g-1, which was 14.45%
higher than that of Li[Li0.2Mn0.54Ni0.13Co0.13]O2. We also found that the Ag/C coating improved the rate capability of the solid-solution material Li[Li0.2Mn0.54Ni0.13Co0.13]O2. The
capacity retention (1C) of the Ag/C-coated sample was 81.3%, compared with the capacity at 0.05C. CV and EIS results showed that the Ag/C coating layer suppressed the oxygen release in the initial charge progress and lowered the surface film resistance and electrochemical reaction resistance
of the pristine sample.
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高影响因子
Nano Energy
·
2021
·
IF 17.881
Lin-bo Tang,Bao Zhang,Tao Peng,Zhen-jiang He,Cheng Yan,Jing Mao,Kehua Dai,Xian-wen Wu,Jun-chao Zheng
As a two-dimensional layered material, SnS is considered a promising candidate anode material for sodium storage due to its high theoretical capacity (1022 mA h g −1 ) and large interlayer spacing (4.33 Å). However, its application is hindered by its large volume expansion and low electronic conductivity . Herein, a unique MoS 2 /SnS@C hollow hierarchical nanotube with self-supporting structure was synthesized through a facile solvothermal reaction. The results indicate that the hollow nanotube structure can support the material structure and provide a large sodium-ion migration channel. In addition, the heterojunction that formed between SnS and MoS 2 can effectively reduce the kinetic barrier of sodium-ion diffusion. Furthermore, the hollow hierarchical nanotube can effectively alleviate the radial and hoop stresses of the SnS sodiation process, inhibit the volume expansion of the material, and increase the capacitance contribution ratio of the material at a high rate. The MoS 2 /SnS@C composites used as anode materials in sodium-ion batteries (SIBs) delivered excellent rate and cycle performance. The discharge capacity was about 325 mA h g −1 at a high current density of 15 A g −1 , and it remained at about 292 mA h g −1 after 2000 cycles at 5 A g −1 current density.
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高影响因子
Advanced Fiber Materials
·
2024
·Vol. 6
·期 2
·430-443
·
IF 17.2
Wu Simeng,Wang Chengjuan,Tang Yunxiang,Jiang Jiangyiming,Jiang Haotian,Xu Xiaodan,Cui Bowen,Jiang Yanyan,Wang Yanxiang
Refining the electromagnetic wave absorption characteristics of traditional metal–organic framework (MOF)-derived carbon composites remains a challenge because of their discontinuous conductive path. To overcome this limitation, in this work, MOF-derived hierarchical Cu 9 S 5 /C nanocomposite fibers are fabricated by electrospinning and subsequent carbonization-sulfurization process. Morphological analyses show that MOF-derived octahedral Cu 9 S 5 /C particles are evenly monodispersed inside carbonaceous fibers. This configuration creates a unique hierarchical structure, ranging from Cu 9 S 5 particle embedding, MOF-derived skeleton, to a three-dimensional network. The optimized composite fibers (Cu 9 S 5 /C-40) exhibit extraordinary electromagnetic wave absorption performance at a low mass fraction (20 wt%): the minimum reflection loss value reaches − 69.6 dB, and the maximum effective absorption bandwidth achieves 5.81 GHz with an extremely thin thickness of only 1.83 mm. Systematic investigations demonstrate that constructing the three-dimensional conductive network to connect MOF derivatives is crucial for activating performance enhancement. The unique nano-micro hierarchical structure synergized with elaborate-configured components endows the materials with optimal impedance matching and amplifies the loss capacity of each part. This work provides a reliable example and theoretical guidance for fabricating new-generation high-efficiency MOF-derived fibrous electromagnetic wave absorbers. Graphical Abstract
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Junwei Chen,Tao Luo,Houbin Huang,Liangzhu Zhang,Wei Chen,Guobing Qin,Jiajie Fan,Huidan Zeng
The high-temperature applications of Silicon Carbide (SiC) power devices are constrained by traditional epoxy molding compound (EMC). A significant challenge arises from the mismatch between the thermal expansion coefficients (CTE) of the encapsulant and the SiC chip, generating thermal and mechanical stresses during prolonged high-temperature operation. While glass encapsulants offer stability above 300 °C, these stresses can lead to mechanical degradation and eventual failure of SiC power devices. We design a glass-based encapsulation material to adjust the CTE of the glass to match that of the SiC chip (3–9 ppm/℃), enabling encapsulation of the device for long-term operation at 300 °C. Finite element analysis (FEA) confirms that the CTE adjustment effectively reducs internal thermal stresses. The glass composite with 10 wt% PbTiO 3 demonstrates a T g of 310 °C and a CTE of 8.48 ppm/℃, successfully encapsulating a SiC schottky barrier diode in TO-247 package form. The encapsulated device exhibits low leakage current, a reverse breakdown voltage of 1,700 V, and a thermal resistance of 0.45 °C/W. Notably, the device maintains excellent performance even after 1,176 h of high-temperature aging, including 336 h at 300 °C and exhibits minimal change during thermal cycling between −50 and 150 °C for 100 cycles. Long-term performance analysis demonstrates superior stability compared to EMC encapsulation. These results highlight the potential of glass-based encapsulants for wide band gap power devices, offering reliability and performance under extreme conditions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shanxin Li,Zhiqi Zhai,Yijing Sun,Sichen Guo,Ting Peng,Hongying Yu,Xuzhou Jiang
The development of stealth materials with both efficient corrosion resistance and low-frequency microwave absorption is highly necessary. In this work, neural-structured Co@C/MWCNTs nanocomposites were successfully synthesized through a facile co-precipitation method, followed by a subsequent pyrolysis process. By adjusting the pyrolysis temperature, the pore structure, crystallinity, degree of graphitization, and electromagnetic parameters of the material were optimized. This optimization achieved a multi-mechanism synergistic effect in the low-frequency region (C-band), including impedance matching, dielectric loss, conductive loss, and magnetic loss. The results indicated that NCN-700 achieved a minimum reflection loss ( RL min ) of −64.31 dB at 4.88 GHz. Additionally, the neural-structured Co@C/MWCNTs nanocomposites exhibited significant effectiveness in low-frequency radar stealth applications, while also displaying superior corrosion resistance, self-corrosion potential ( E corr = 0.52 V), and self-corrosion current density ( I corr = 2.58 × 10 −6 A/cm 2 ). These findings suggest the promising potential for neural-structured Co@C/MWCNTs nanocomposites in applications related to low-frequency microwave absorption and corrosion protection.
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高影响因子
Antioxidants
·
2025
·Vol. 14
·期 5
·576
·
IF 6.6
Jiaming Chen,Yuting Fu,Shaoping Weng,Jianguo He,Chuanfu Dong
Scale drop disease virus (SDDV) poses an escalating threat to global aquaculture, prompting an urgent need for research. Our study found that SDDV infection upregulates genes related to iron, oxidative stress, and lipid metabolism, causing iron overload, reactive oxygen species (ROS) accumulation, and ultimately ferroptosis. Among the tested antioxidants, vitamin C (VC) demonstrated the most potent inhibitory effect in mandarin fish, reducing SDDV-induced mortality by 37.5%. qPCR and IFA results showed that VC effectively suppressed SDDV infection; decreased ROS, lipid peroxidation (LPO), and iron levels; and enhanced glutathione peroxidase 4 (GPX4) expression in infected cells. Mechanistically, VC’s inhibitory effect was reversed by the nuclear factor erythroid 2-related factor 2 (Nrf2) inhibitor ML-385, indicating an Nrf2-dependent pathway. VC promoted Nrf2 nuclear translocation and activated downstream antioxidant genes. Moreover, VC modulated inflammation by regulating pro- and anti-inflammatory factors. These findings suggest VC as a promising therapeutic for SDDV infection.
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PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 17
·e2311075121
·
IF 9.4
Lanfang Que,Fuda Yu,Jihuai Wu,Zhang Lan,Yutong Feng,Ruizheng Zhao,Zhihao Sun,Zhuo Yang,Hao Luo,Dongliang Chao
Voltage oscillation at subzero in sodium-ion batteries (SIBs) has been a common but overlooked scenario, almost yet to be understood. For example, the phenomenon seriously deteriorates the performance of Na3V2(PO4)3 (NVP) cathode in PC (propylene carbonate)/EC (ethylene carbonate)-based electrolyte at −20 °C. Here, the correlation between voltage oscillation, structural evolution, and electrolytes has been revealed based on theoretical calculations, in-/ex-situ techniques, and cross-experiments. It is found that the local phase transition of the Na3V2(PO4)3 (NVP) cathode in PC/EC-based electrolyte at −20 °C should be responsible for the oscillatory phenomenon. Furthermore, the low exchange current density originating from the high desolvation energy barrier in NVP-PC/EC system also aggravates the local phase transformation, resulting in severe voltage oscillation. By introducing the diglyme solvent with lower Na-solvent binding energy, the voltage oscillation of the NVP can be eliminated effectively at subzero. As a result, the high capacity retentions of 98.3% at −20 °C and 75.3% at −40 °C are achieved. The finding provides insight into the abnormal SIBs degradation and brings the voltage oscillation behavior of rechargeable batteries into the limelight.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Hangyuan Guo,Hualei Liu,Lingqiao Wei,Songchun Fang,Roman A. Surmenev,Yi-Tao Liu,Jianyong Yu,Bin Ding
Traditional ceramic materials are prone to crushing due to structural collapse at high temperatures. Current efforts are focused on developing flexible and elastic ceramic materials with high thermal stability to address practical needs in the field of high-temperature thermal insulation, but this remains a significant challenge. In this work, elastic and compressible barium aluminosilicate (BAS) nanofibrous sponges are fabricated through gelation electrospinning and calcination processes. The resulting BAS nanofibrous sponges demonstrate excellent elasticity and compressibility across a temperature range of −196 to 1400 °C and can withstand 1000 compression cycles without structural collapse. Furthermore, they exhibit low thermal conductivity (0.0239 W m–1 K–1), low bulk density (4.42 mg cm–3), and high working temperature. In this sense, our study highlights the great potential of BAS nanofibrous sponges as thermal protective materials in extreme operating environments.
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高影响因子
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