Materials Research Express
·
2019
·Vol. 6
·期 9
·0950a8
·
IF 1.449
She Jia,Zhengjun Yao,Shasha Zhang,Zelei Zhang,Xuewei Tao,Yingying Liu,Linchao Sun
Graphene (Gr) has attracted much attention due to its excellent performance. There are various studies about Gr composite materials; however, the influence of Gr on anticorrosion mechanism was not explored widely. In this paper, the Gr was prepared by oxidation-reduction method and was modified with 3-aminopropyl triethoxysilane for better dispersion. Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Micrograph (SEM) were utilized to characterize the microstructure of coating and the modification of Gr. X-Ray Diffraction (XRD) was employed to analyse the phase composition of the coating. The anticorrosion performance of coating was investigated by employing polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that the uniformly dispersed Gr nanosheets in Zn-Al-Gr/waterborne epoxy enhanced the protection property of the composite coating. Furthermore, the corrosion resistance properties of the composite coating were optimized by tuning the concentration of the added Gr.
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International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 3
·552-561
·
IF 5.6
Cao Kangzhe,Wang Sitian,He Yanan,Ma Jiahui,Yue Ziwei,Liu Huiqiao
Al is considered as a promising lithium-ion battery (LIBs) anode materials owing to its high theoretical capacity and appropriate lithation/de-lithation potential. Unfortunately, its inevitable volume expansion causes the electrode structure instability, leading to poor cyclic stability. What’s worse, the natural Al 2 O 3 layer on commercial Al pellets is always existed as a robust insulating barrier for electrons, which brings the voltage dip and results in low reversible capacity. Herein, this work synthesized core–shell Al@C–Sn pellets for LIBs by a plus-minus strategy. In this proposal, the natural Al 2 O 3 passivation layer is eliminated when annealing the pre-introduced SnCl 2 , meanwhile, polydopamine-derived carbon is introduced as dual functional shell to liberate the fresh Al core from re-oxidization and alleviate the volume swellings. Benefiting from the addition of C–Sn shell and the elimination of the Al 2 O 3 passivation layer, the as-prepared Al@C–Sn pellet electrode exhibits little voltage dip and delivers a reversible capacity of 1018.7 mAh·g −1 at 0.1 A·g −1 and 295.0 mAh·g −1 at 2.0 A·g −1 (after 1000 cycles), respectively. Moreover, its diffusion-controlled capacity is muchly improved compared to those of its counterparts, confirming the well-designed nanostructure contributes to the rapid Li-ion diffusion and further enhances the lithium storage activity.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Buhao Zheng,Bonan Gu,Qizhen Zhang,Jingxin Li,Changkun Song,Dihua Ouyang,Wenchao Zhang
Liquid metals offer a unique paradigm for modulating the performance of energetic materials due to their exceptional physicochemical properties. In this study, a novel strategy to enhance the reactivity of Al/MoO 3 thermite by incorporating liquid metal Ga was systematically investigated. Micro-scale Ga particles and Al Ga composite particles were successfully prepared via a surfactant-assisted ultrasonic dispersion method, which effectively inhibited the coalescence of liquid Ga and enabled uniform distribution within the thermite. The results demonstrated that the Ga-containing thermite exhibited excellent performance in key parameters including heat release, ignition, and combustion characteristics. Even with Ga addition accounting for only 5% of the Al mass, the AlGa5/MoO 3 thermite exhibited a 6.6% enhancement in heat release to 4023 J/g, a 29% reduction in ignition delay time to 0.72 ms, a 35% increase in burning rate to 10.2 m /s, and a 5.7% rise in peak flame temperature to 2562 °C, all compared to the baseline Al/MoO 3 thermite. Post-combustion characterization confirmed the formation of a Ga Mo intermetallic compound, which demonstrates that Ga primarily acts as a mediator by forming rapid heat-transfer channels. The findings underscore the immense potential of liquid metals as versatile additives for designing next-generation energetic materials with tailored ignition and combustion properties.
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产品关联
DOI
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Corrosion Communications
·
2024
·
IF 0
Zhiyuan Feng,Jiao Li,Keqi Huang,Guoqiang Liu,Huanhuan Bai,Xin Huang,Jun Qi,Zhengwei Tang,Penghai Xu,Xiaofei Yang,Zheng Qu,Guozhe Meng
Within the realm of corrosion protection methods for Al alloys, sol-gel technique has garnered increasing attention. However, conventional sol-gel methodologies cannot provide adequate long-lasting corrosion protection to Al alloys when exposed to chloride-rich solutions. This paper introduces an innovative approach to substantially augment the corrosion resistance of aluminum alloys through utilization of polydopamine (PDA)-modified sol-gel films. Effort was made to fabricate a PDA-modified sol-gel coating and a systematic investigation was conducted thereof. Long-term corrosion performance of this coating in 3.5 wt.% NaCl solution was evaluated through electrochemical impedance spectroscopy (EIS). Results show that the low-frequency impedance of the PDA-modified sol-gel coating remains significantly high at 7.9 × 10 5 Ω·cm 2 , even after 36 d of immersion in 3.5 wt.% NaCl medium, indicative of excellent protective properties. It notably surpasses low-frequency impedance of the unmodified coating, which registers at 2.5 × 10 4 Ω·cm 2 . The incorporation of PDA into the sol-gel coating, facilitated by adsorption and diffusion mechanisms, serves to fill micrometer- and nanometer-scale defects of the coating, thereby markedly enhancing their compactness. Furthermore, despite its modest thickness of 9 μm, the PDA-modified coating exhibits enduring corrosion protection capabilities.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
·
纳米材料
·
电化学
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DOI
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Qingsong Deng,Zhou Gong,Wenjie Mou,Zhenmin Wang,Zhengchao Xie,Yukun Chen
Nowadays, metal-polymer composites are used to reduce automobile's weight. However, welding nonpolar polymers to metals is difficult due to the lack of polar groups in molecular chains . The paper put forward an innovative strategy to solve this problem: by adding magnesium methacrylate (MDMA) changes the physical and chemical properties of polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM) TPV, which improves the compatibility of TPVs and metals. Moreover, the simulation experiments are carried out on plate vulcanization machine. It is found that the addition dosage and order of MDMA have a certain effect on the welding strength . Furthermore, friction stir welding (FSW) replicates the results of simulation experiments, and the ultimate tensile shear strength of P7-E3M1/aluminum alloy (AA6061-T6) reaches 24 MPa. Finally, the welding strength variation regularity with time shows that the properties of metal-TPVs become stable after 10 days. This work introduces a feasible and effective strategy that can be applied to weld various metals to polymers.
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高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Bin Kang,Ming Li,Zhaoying Di,Xiaonan Guo,Ying Wei,Jingbo Jia,Runduo Zhang
Series of ZSM-5 zeolites with diverse contents and locations of Al pairs were synthesized, and Co 2+ ions were subsequently anchored at the Al pairs of ZSM-5 zeolites by wet ion-exchange with H protons. The Co-ZSM-5 sample derived from the mixtures of AlCl 3 and TEOS of Si/Al=30.3 showed the best de N 2 O performance. Analysis on Co (Ⅱ) ion exchange capacity demonstrated the content of Al pairs followed the sequence: AlCl 3 (0.84) > Al(NO 3 ) 3 (0.73) > aluminum isopropoxide (0.65) and TEOS (0.84) > silicic acid (0.57). More Al pairs coordinated with protons or cobalt ions were essentially associated with better performances for N 2 O catalytic dissociation. Moreover, Si source had a significant effect on the location of Al pairs determined by UV–vis–DRS of bare Co (Ⅱ), Al pairs of ZSM-5 zeolite synthesized from TEOS were enriched in the sinusoidal channel (γ site), whereas those synthesized from silicic acid were concentrated in the channel intersections (6-MRs β site). The theoretical calculation revealed that the O 2 desorption at γ-site Co 2+ of ZSM-5 zeolite required to overcome less energy barrier (23.8 kcal/mol) than that at β-site one.
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JOURNAL OF RARE EARTHS
·
2016
·Vol. 34
·期 4
·428-434
·
IF 2.188
Hao TANG,Hui DENG,Qingbo REN,Dingzhou CAI,Yiming REN,Lang SHAO,Yongde YAN,Milin ZHANG
The electrochemical behavior of Pr(III) and formation process of Pr-Al intermetallics were investigated by different electrochemical methods. The reduction of Pr(III) ion to metallic Pr is an one-step three-electrons reaction. The reversibility of Pr(III)/Pr(0) system was evaluated by cyclic voltammograms with different scan rates. The co-reduction of Pr(III) and Al(III) ions formed three different Pr-Al intermetallics at electrode potentials around −1.40, −1.80, and −1.95 V vs. Ag/AgCl at 723 K, respectively. Open-circuit chronopotentiometry and electromotive force (emf) measurements were carried out to estimate the relative molar Gibbs energies of Pr for the formation of different Pr-Al intermetallics in the temperature range of 723–843 K. The activities of Pr in the Pr-Al intermetallic compounds were calculated.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Chuandong Wu,Jian Zhang,Guoqiang Luo,Qiang Shen,Zhanghua Gan,Jing Liu,Lianmeng Zhang
To provide insight into interfacial segregation and precipitates behavior in the ultrafine grained Al-based metal matrix composites , AA7075/B 4 C composite was selected as the model system. The bulk composite was synthesized via cryomilling, field assistant sintering and followed heat treatment. The segregation layer of MgO was observed to increase from ∼15 nm to 20–25 nm during heat treatment due to faster solute diffusion caused by the Al/B 4 C interface and large volume fraction of grain boundaries. In addition to the segregation, representative TEM results show that the spherical GP zone and platelet η′ precipitates distribute in grain interior, while several coarser η precipitates located at LAGB and HAGB with the orientation relationship of (0001)//(1 1 ( _ ) 1) and [10 1 ( _ ) 0] η //[110] Al . However, the precipitates at LAGB exhibit finer size relative to those at HAGB, which could be ascribed to the higher accumulation of solute atoms at HAGB to favor the growth and coarsening of the precipitation during heat treatment.
研究领域:
材料科学
·
金属基复合材料
·
微观组织演化
·
物理冶金
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DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Peibo Li,Jianian Hu,Tao Fang,Youlin Zhu,Yi Sun,Xiao Wang,Xuebin Yang,Qiang Shen,Guoqiang Luo
The objective of this study is to modulate the size of intermetallic compounds to increase the strength of Al–Ag composites. In this study, we prepared Al–Ag composites using plasma-activated sintering (PAS). The effect of the applied current on the nucleation barrier of the Al/Ag alloy phase was investigated. The strengthening mechanism of Ag-reinforced Al matrix composites was explored. We found that two alloy phases, Ag 2 Al and Ag 3 Al, were generated in the Al–Ag composites. The alloy phases distributed at the grain boundaries strengthened the Al–Ag composites by enhancing the dislocation density in the matrix and by impeding dislocation motion . The ultimate tensile strength and yield strength of the Al–7Ag composite increased by 60.1% and 166%, respectively, compared with those of pure Al. Moreover, we calculated the contribution of each strengthening mechanism to the overall yield strength. The applied current lowered the nucleation barrier of the alloy phase and facilitated the nucleation process.
研究领域:
材料科学
·
金属基复合材料
·
机械工程
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高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2018
·
IF 1.011
Dong Liu,Yanxiong Liu,Guannan Liu
The influences of carbon nanotubes (CNTs) additions on the flash ignition characteristics of Iron (Fe) and aluminum (Al) nanoparticles (NPs) were presented. CNTs can be used as the additive to these metal nanoparticles for improving the flash ignition and burning processes. Different mass fractions of CNTs additions were considered. The mixture of Al and CNTs could combust in air with obvious giant flame, whereas the mixture of Fe and CNTs combusted under a relative stable condition with slight red light. The temperature distributions were measured using non-contact optical method and showed that Al NPs mixed with CNTs were burning at a higher temperature level than Fe NPs. Although different mass fractions of CNTs cannot significantly change the overall flash ignition phenomenon, CNTs additions influenced the minimum ignition energy (MIE) of mixtures. The appropriate content of CNTs addition can decrease the Fe NPs MIE significantly. However, the Al NPs MIE decreased all along with the increase of CNTs content. The micro- and nano- structures of Fe and Al NPs with CNTs additions before and after ignitions were examined by scanning electron microscope and high-resolution transmission electron microscopy. It was found that the special thermal conductive characteristics of CNTs and the cross-connected features for metal particles with CNTs caused the enhancement of flash ignition.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Ming Wen,Yijie Ding,Minglei Yang,Weizhong Zheng,Weizhen Sun,Ling Zhao
Beta zeolite is one of the most promising green catalysts for the isobutane (C4) alkylation with the advantages of eco-friendliness and facile separation. Although Al-rich beta zeolites are found to exhibit a longer catalytic lifetime in C4 alkylation, they suffer from low selectivity owing to the severe cracking reactions induced by their numerous strong Brønsted acid sites (BAS). In this work, cobalt modification has been used to modulate the acidity of Al-rich beta zeolite to improve the selectivity of C4 alkylation. The highly dispersed, tetrahedrally coordinated isolated Co(II) species are confirmed to be located at the zeolite cationic sites. These cobalt species exist as Lewis acid sites, with the formation of Co–H species activating the C–H bonds. Among Co@HB-1 catalysts with various cobalt loadings, the 1.7Co@HB-1 sample exhibits the highest catalytic productivity. Moreover, in the optimization of process conditions, a lower olefin WHSV slows coke accumulation to extend lifetime but intensifies cracking, which in turn reduces RON; a higher I/O ratio accelerates hydride transfer kinetics and thus enhances RON. Under optimal conditions, 1.7Co@HB-1 achieves a RON of 96 at an I/O ratio of 100 and an olefin WHSV of 0.08 h–1. This study provides fundamental insights into tuning the acidity of zeolites for significantly enhanced C4 alkylation selectivity.
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Small
·
2026
·
IF 11.8
Zengming Qin,Yang Han,Junchen Lv,Fangke Wang,Guoguo Liu,Yutong Wang,Yu Song,Kangjun Wang
Prussian blue analogues (PBAs) are promising cathodes for aqueous aluminum-ion batteries (AAIBs) due to their 3D open frameworks, which potentially facilitate fast Al 3+ transportation. However, their practical applications are severely hindered by poor electronic conductivity, suboptimal Al 3+ diffusion kinetics, and structural degradation. This study proposes a high-entropy Prussian blue analogue (HE-HCF) cathode through synergistic incorporation of multiple transition metals (Mn, Fe, Ni, Cu, and Zn) to enhance aqueous Al 3+ storage. This approach alters the local coordination environment, inducing the reduction of [Fe(CN) 6 ] groups and thus enhancing their reactivity. Moreover, density functional theory (DFT) calculations reveal improved electronic conductivity and decreased Al 3+ diffusion barrier. When coupled with a polyvinylidene fluoride-coated Zn-Al alloy (Zn-Al(P)) anode, the assembled HE-HCF//Zn-Al(P) full cell delivers a high capacity of 110 mAh g −1 at 0.1 A g −1 and a high energy density of 163.8 Wh kg −1 . Additionally, the full cell achieves a long lifespan of 1600 cycles at 1.0 A g −1 , which is attributed to the low fluctuation of lattice parameters brought from strengthened metal-cyanide bonds within HE-HCF. This work provides new insights into the design of multivalent ion batteries employing high-entropy engineering.
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PubMed
高影响因子
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