CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·5918-5928
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IF 3.83
Yu Zhao,Tianqi Zhang,Liaoyuan Chen,Tianbiao Yu,Jiayu Sun,Chuang Guan
In situ Ti(C, N), ring phase, and multi-phase enhanced Ni204-based alloy coating were prepared by adding various Ti/C/TiN ratios particles. The effects of the reinforcement phase on the microstructure, microhardness , tribological property, and microstructure characteristics at the interface between the coating and substrate were investigated. The results show that the coatings with a 5:1 mass fraction ratio of TiN/C exhibits the highest microhardness , which is 3.78 times higher than that of the original Ni204 coating. While, the coating with 21:7:2 mass fraction ratio of TiN/Ti/C exhibits the lowest friction coefficient , which is 4.44 times smaller than that of the original Ni204 coating. The addition of Ti and C particles promotes the precipitation of ring phase and carbides , reduces ceramic agglomeration, alleviates the floating of ceramic particles, and improves the bonding strength of reinforcement phases. Owing to the good mutual solubility among Fe, Ni, and, Cr elements, the diffusion happened at the interface between the coating and substrate.
研究领域:
材料科学
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表面工程
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金属学与金属工艺
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机械工程
·
复合材料
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DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 7
·3217-3222
·
IF 2.961
Du Gang,Zhao Jinguo,Yang Hongwei
Lithium-sulfur batteries with high theoretical energy density have drawn much attention during the past decades, while the shuttle effect of the polysulfide also hinders the practical application. The employment of suitable host materials has been considered as the effective strategy to inhibit the polysulfide migration. In this work, we develop MoO 2 /C composite as sulfur host material to increase the capacity of lithium-sulfur batteries while retaining high capacity after cycles. The MoO 2 /C composite could serves as active sites, effectively adsorbing and catalytically converting polysulfide, thus improving the redox kinetics and reducing shuttle effect. Owing to these merits, the as-prepared MoO 2 /C@S cathodes exhibit high capacity of 1165 mAh g −1 at 0.1 C. Meanwhile, the battery exhibits superior rate capability and stable cycling performance.
研究领域:
储能
·
材料科学
·
电化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 9
·7231-7236
·
IF 2.986
Yaoyao Wu,Shangshu Qian,Hua Lan,Lei Yan,Haoxiang Yu,Xing Cheng,Fanmin Ran,Miao Shui,Jie Shu
In this work, silver and carbon co-coated SrLi 2 Ti 6 O 14 is synthesized by using a solid-state assisted solution method, with glucose as carbon source and silver nitrate as Ag source. The structural and morphological properties of as-prepared samples are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), which confirm that C/Ag composite layer is uniformly coated on the surface of SrLi 2 Ti 6 O 14 . Electrochemical measurements like galvanostatic charge/discharge tests, rate performance, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis are also undertaken to evaluate and compare the lithium storage capability of SrLi 2 Ti 6 O 14 before and after coating. According to the results, SrLi 2 Ti 6 O 14 @C/Ag presents enhanced electrochemical capability compared with bare material. It can be found that bare SrLi 2 Ti 6 O 14 only delivers the reversible capacity of 140.32 mA h g −1 with capacity retention of 90.7% at 100 mA g −1 after 200 cycles. In contrast, SrLi 2 Ti 6 O 14 @C/Ag presents the reversible capacity of 151.20 mA h g −1 with only 6.7% capacity loss after 200 cycles. The improvement is owing to the increase of electronic conductivity and the decrease in the redox polarization after coating. In order to further investigate the structural stability of SrLi 2 Ti 6 O 14 @C/Ag, in-situ XRD was performed as well. All the results prove that the C/Ag co-coating has positive effect on the electrochemical performance of SrLi 2 Ti 6 O 14 .
研究领域:
材料科学
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电化学
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储能技术
·
纳米材料
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·Vol. 46
·期 55
·28156-28165
·
IF 5.816
Jiaguang Zheng,Meijia Liu,Fuying Wu,Liuting Zhang
NaBH 4 has been widely considered as a low-cost hydrogen storage material with high gravimetric hydrogen capacity of about 10 wt%. However, its strong thermodynamic stability severely hinders the application of NaBH 4 to obtain hydrogen. In this study, multi-hydroxyl xylitol, for the first time, was chosen as a protic hydrogen carrier to destabilize and react with NaBH 4 . The NaBH 4 -xylitol composites were easily prepared through hand-milling, which leads to the fast liberation of hydrogen from moderate temperatures lower than 80 °C with more than 3.6 wt% hydrogen desorption capacity. Besides, over 80% of hydrogen could be efficiently released in NaBH 4 -xylitol composite. The dehydrogenation process is proved to be completely impurity-free and controllable by altering the NaBH 4 /xylitol ratios and operating temperatures. The reaction between NaBH 4 and xylitol is investigated to be similar to an alcoholysis procedure, however no observable liquid phase takes place before and after the dehydrogenation of NaBH 4 -xylitol composite, showing a great potential to produce hydrogen under low temperatures through solid-state carriers.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Chenyang Hou,Xifei Li,Weihua Zhang,Ruixian Duan,Mengyang Li,Guiqiang Cao,Zhengxi Hou,Zongnan Lv,Yiming Qi,Yitong Yuan,Guohua Liu,Jingjing Wang,Yukun Xi,Xuexia Song,Wenbin Li,Jiujun Zhang
Single-component transition metal selenide (TMSe) hosts still struggle to balance the adsorption of lithium polysulfides (LPSs) and their catalytic conversion. Herein, a heterostructure host (MoSe 2 -CoSe@C) with an intra-spherical interwoven architecture was synthesized via impregnation-chemical vapor deposition. Benefiting from the synergy of adsorptive MoSe 2 and conductive CoSe, the heterointerface induces electron transfer from CoSe to MoSe 2 , upshifting the d-band center to enhance LPSs adsorption. Compared with their single-component hosts, the MoSe 2 -CoSe@C notably reduces the energy barriers of sulfur redox reactions, decreasing those for Li 2 S oxidation by 31.45 kJ mol −1 and for Li 2 S 4 reduction by 191.67 kJ mol −1 . Additionally, Co acts not only as a core component of the heterostructure but also induces the conversion of carbon-based materials into carbon nanotubes at high temperatures, thus forming a unique interwoven network. This network not only ensures efficient electron transport and inhibits the agglomeration of active components, but also increases the contact area between the host and active sulfur, thereby enhancing the number of effective catalytic sites. Consequently, the MoSe 2 -CoSe@C/S cathode achieves a discharge specific capacity of 582.1 mAh g −1 at a current density of 5C, with only 0.07% capacity decay per cycle over 200 cycles at 4C. This work provides a strategy to construct high-performance adsorption-catalytic hosts for lithium‑sulfur batteries (LSBs).
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 7.9
Li Zeng,Huibin Guan,Sijiang Hu,Xiaochao Fan,Hanna He,Chuhong Zhang
As a typical two-dimensional transition metal sulfide, TiS 2 holds immense potential for lithium-ion batteries (LIBs) owing to its high theoretical capacity and large interlayer spacing. Nevertheless, intrinsic limitations, including poor intrinsic electronic conductivity and structural degradation hinder its development in high-energy-density and long-lasting LIBs. Herein, we prepared an in-situ derived TiS 2 /C composite electrode by harnessing few-layer Ti 3 C 2 MXene as a sacrificial template. Through controlled sequential S substitution within a S-rich environment, we achieved the uniform encapsulation of ultrathin TiS 2 nanosheets within a conductive amorphous carbon matrix. This unique architecture establishes robust and conductive networks that ensure excellent structural integrity while enabling rapid electron/ion transfer kinetics. In addition, the theoretical calculations of binding energy evolution unambiguously confirm the reaction pathways: Ti 3 C 2 MXene→intermediate TiO 2 /C→TiS 2 /C. As a result, the TiS 2 /C electrode delivers a high initial discharge capacity of 921.9 mAh g −1 at 100 mA g −1 , with a capacity retention rate of 72.7 % after 200 cycles. Remarkably, it sustains discharge capacity of 631.2 mAh g −1 after 1000 cycles at 500 mA g −1 , showcasing superior high-rate cyclability. This work paves the way for the development of energy-dense and long-cycling-life LIBs.
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 9.8
Liuliu Liu,Xiaoling Liu,Yaochun Yao,Xinyu Jiang,Juan Yang,Xiangyang Zhou,Bin Yang,Keyu Zhang
In the realm of electrochemical energy storage, it is vital to design electrode materials that are both high-performance and stable cycling. Compositing with carbon material is an effective method for addressing the volume expansion of silicon-based negative electrodes, with the uniformity and dependability of the composite material structure design dictating its electrochemical performance. We offer a simple and scalable electrostatic self-assembly approach for constructing cations and anions prone to in situ electrostatic interactions adsorbed onto Si nanoparticles and lignin (Si/C-lignin@C-SE), which is generated by carbon sintering the lignin@C onto Si. Unlike ball milling and hydrothermal methods, Si/C-lignin@C-SE exhibits homogeneous carbon layer (3–6 nm) with high specific surface area and graphitization degree, resulting in abundant binding sites for nano‑silicon particles. This unique structure can offer stability and limit the influence of Si nanoparticle volume expansion, as well as significantly increase electronic conductivity and electrochemical activity. Compared to the traditional mechanical ball milling method, Si/C-lignin@C-SE composite shows excellent specific capacity and ultrastable long-cycling performance: an initial discharge capacity of 2593.19 mAh g −1 with coulombic efficiency of 92.3 %, and stable capacity of 1200 mAh g −1 after 200 cycles. As a result, as-prepared Si/C-lignin@C-SE electrodes are expected to achieve good electrochemical performance and long-term durability.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Xiaojing Liu,Fozia Sultana,Ting Xiao,Qiurong Wang,Meijie Shi,Xiaoqing Yan,Tongtong Li,Renhong Li
High-entropy alloy (HEA) catalysts derived from metal-organic frameworks (MOFs) pave the way for efficient electrochemical energy conversion. Herein, we report the synthesis of C@FeCoNiMnMo/NF, C@FeCoNi/NF and C@FeCoNiMn/NF catalysts via a one-step hydrothermal process coupled with subsequent calcination. Structural and morphological characterizations (XRD, XPS, SEM, and TEM) verifies the successful formation of a carbonized MOF-derived high-entropy alloy with uniform metal dispersion. Among these catalysts, C@FeCoNiMnMo/NF exhibits superior urea oxidation reaction (UOR) activity, achieving E 10 = 1.24 V and E 100 = 1.32 V (corresponding to 10 and 100 mA·cm −2 , respectively), with excellent durability over 30 h of continuous operation. The enhanced adsorption of key intermediates induced by Mo doping, as evidenced by both electrochemical analysis and DFT calculations, is identified as the primary factor responsible for the accelerated UOR kinetics. This work establishes an innovative approach for the rational design of MOF-derived HEA catalysts, which boosts the efficiency of urea-assisted hydrogen production from water.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Chang Liu,Jianlin Cao,Yuxiang Bao,Juncong Yuan,Yuanning Yue,Yibin Liu,Xiaobao Chen,Yinming Guo,Chaohe Yang,Baorui Li,Xiang Feng,De Chen
Cu-based catalysts present a promising alternative to toxic mercuric chloride (HgCl 2 ) in acetylene hydrochlorination owing to their cost-efficiency and environmental compatibility. However, the dispersion and leaching of active sites under operational conditions hinders its application. Herein, we designed a lignin-supported Cu 1 N single-site copper catalyst (Cu 1 /L-CN) by site-anchored strategy which employed pyrrolic N functional groups to anchor and inhibit the aggregation of Cu atoms by strong metal-support interaction. Based on kinetics study and in-situ characterizations, it is found that the Cu 1 /L-CN catalyst inhibits the formation of complexes between copper and acetylene, suppressing over-adsorption of acetylene and undesired side reactions. Accordingly, the Cu 1 /L-CN catalyst demonstrated excellent catalytic activity and a low deactivation rate constant (k D = 0.016 h −1 ) with significantly reduced carbon deposition. This work will provide a new approach to the design of mercury-free catalysts toward industrial production of vinyl chloride from the acetylene hydrochlorination.
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产品关联
DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Chunxiao Han,Chunmei Xiahou,Luna Ruan,Zhongpeng Lu,Qi Gong,Yulin Gao,Lihua Zhu
Rare-earth (RE) elements are often employed to optimize electrocatalytic performance due to their tunable electronic structures and surface properties. Herein, a yttrium oxide-doped Pt-based catalyst (Pt–Y2O3/C) is engineered for the electrocatalytic methanol oxidation reaction (MOR), and the surface Y/Pt atomic ratio is precisely modulated to optimize its performance. Pt–Y2O3/C-2 (1/0.17 Pt/Y atomic ratio, Pt loading of 4.73 wt %) exhibits optimal mass activity (MA) for MOR, 5.10 A mgPt–1 in 1.0 M KOH with 1.0 M CH3OH, obviously outperforming commercial 20 wt % Pt/C by a factor of ∼12.8. It also shows superior CO-poisoning tolerance and stability; its MA for the MOR remains at 3.80 A mgPt–1 after the 10 000 s stability test. Integrated characterization results demonstrate that Y2O3 doping induces an electronic interaction with Pt, thereby reducing the electron density of Pt and optimizing its electronic structure, attenuating the adsorption of CO* intermediates at the Pt sites. Y2O3 doping also decreased the charge transfer resistance (Rct) in the MOR. The superior MOR performance of the Pt–Y2O3/C-2 catalyst originates from its uniformly sized Pt–Y2O3 nanoparticles and unique electronic effect. This work highlights the regulatory role of the rare-earth metal in Pt-based catalysts for the MOR, offering a general strategy for achieving excellent catalytic performance.
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产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2026
·
IF 6
Jie Yang,Qingfeng Zhang,Quan Pei,Mei Yang,Jiafeng Zhai,Ling Li,Jue Liu,Shuhong Xie
The Bi 2 Se 3 /SnSe 2 @C heterostructure anode encapsulated within a carbon matrix was synthesized by coordination reactions followed by selenization. This rationally designed composite enhances K + diffusion kinetics and electron transfer synergistically, leading to outstanding potassium storage performance. It delivers excellent cycling stability and rate performance. At a high current density of 1000 mA g −1 , the Bi 2 Se 3 /SnSe 2 @C delivers an initial discharge capacity of 274.1 mAh g −1 , and exhibits stable cycling stability for 1000 cycles.
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2026
·
IF 8.6
Chen Chen,Yuanyuan Zhang,Yina Wang,Dan Yao,Zhongjun Ma,Xueyun Han
Iron-doped carbon composites are prepared as microwave absorbing materials. • Remarkable microwave absorption is achieved via synergistic loss mechanisms. • The dual absorption mechanism involves dielectric and magnetic losses. • Controlling the calcination temperature allows tuning losses and impedance matching. • The optimized Fe 3 O 4 @C composite achieves an exceptional minimum reflection loss. : The pursuit of lightweight, high-performance, broadband, thin electromagnetic wave–absorbing materials has attracted considerable research attention in the context of addressing electromagnetic pollution and interference issues. Herein, we prepare iron-doped carbon composites (FeO x @C) via a hydrothermal method and controlled calcination, achieving remarkable electromagnetic wave absorption performance through synergistic loss mechanisms. By adjusting the calcination temperature, the granular microstructure, including Fe 3 O 4 crystallinity/morphology and carbon graphitization/defects, was precisely controlled to balance conductive/magnetic losses and optimize impedance matching for optimal performance. A large reflection loss peak of −44.8 dB, correlating to nearly 99.99% absorption efficiency, is obtained with a 2.5-mm-thick Fe 3 O 4 @C nanorod absorber at an effective absorption bandwidth ( RL < −10 dB) of 3.92 GHz (9.76–13.68 GHz). Important relationships are revealed between the reflection loss peak value (RL), absorption peak frequency, and effective absorption bandwidth (EAB), with respect to the overall thickness of the Fe 3 O 4 @C nanorod absorber. The HFSS Electromagnetic simulations were conducted to verify the above experimental findings. The results demonstrate that the Fe 3 O 4 @C composite coating achieves the lowest radar cross-section (RCS) over a wide angular range compared to Fe 2 O 3 @C and Fe@C, verifying its superior microwave absorption performance. This research achievement holds particular importance in the context of mitigating radiation interference in 5G technology and enhancing shielding absorption of X-band radar waves.
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DOI
高影响因子
危险品化学品经营许可证（带存储）