JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Wei Sun,Ke Zhan,Zheng Yang,Rui Zhao,Tian Wang,Bin Zhao,Yan Ya,Junhe Yang
In recent years, graphene has attracted a lot of attention as a reinforcement to enhance aluminum (Al) matrix composites due to its two dimensional structure and excellent mechanical properties . However, there are still some obstacles that limit the performance of the composites, such as uniform distribution of graphene oxide (GO) and the interfacial bonding between GO and Al matrix. In this work, Cu 2+ ions acting as a bonding bridge were added into GO/Al powder suspension to improve the distribution of GO sheets on Al powder via a simple electrostatic adsorption method. Then, vacuum hot-pressing sintering was applied to fabricate bulk composites, and their mechanical properties were investigated. The results showed that doping 3 wt% Cu 2+ ions illustrated the best dispersion of GO on the surface of Al powder, meanwhile GO was maximally reduced. Compared with unreinforced Al, the hardness, compressive strength and flexural strength of the 3 wt% Cu-doped bulk composite were increased by 121%, 120% and 28%, respectively. However, the mechanical properties were deteriorated after doping 5 wt% Cu 2+ ions, due to the aggregation of GO on the surface of Al powder. This was attributed that Cu 2+ ions had a critical coagulation concentration in aqueous GO suspensions. It was expected this work could offer some useful information for preparing graphene reinforced metal composites.
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高影响因子
JOURNAL OF CATALYSIS
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2019
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IF 7.723
Habib Ullah,Bibimaryam Mousavi,Hussein A. Younus,Zafar A.K. Khattak,Suleman Suleman,Muhammad T. Jan,Baoyi Yu,Somboon Chaemchuen,Francis Verpoort
Carbon dioxide , the main cause of environmental pollution, its utilization to produce valuable products is of utmost interest. A series ONO pincer hydrazone based most active mono-nuclear Al(III) complexes were successfully synthesized and characterized with the help of NMR, IR, mass spectrometry and only complex 2a was confirmed by single-crystal analysis. The synthesized Al(III) complexes were then employed as capable catalysts for the solvent-free chemical fixation of CO 2 with epoxides at atmospheric pressure and could be reused five times without loss of any catalytic activity. In addition, the catalytic mechanism was investigated by analyzing intermediates via 1 H NMR, 13 C NMR, and mass MALDI-TOF. The excellent catalytic performance could be due to simultaneous attack and the opening of the epoxide by metal centers to form an alkoxide ion which activates the CO 2 the same time.
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高影响因子
RENEWABLE ENERGY
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2019
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IF 5.439
Qing Zhou,Xinyan Zhong,Xingyue Xie,Xuanyi Jia,Baiquan Chen,Ning Wang,Lihong Huang
Biomass-derived acetic acid (HAc), as a hydrogen storage medium, can be transformed to hydrogen via on-board reformer for fuel cells. Steam reforming (SR) of HAc is a traditional hydrogen production process, but endothermicity of SR is a concern for heat management in dynamic on-board application. Auto-thermal reforming (ATR) of HAc is a promising route, while catalyst deactivation in harsh ATR atmosphere should be addressed. Samarium-promoted ordered mesoporous Ni-xSm-Al-O catalysts were synthesized via improved evaporation-induced self-assembly (EISA) method, and tested in ATR of HAc for hydrogen production. The Ni-2Sm-Al-O catalyst produced a stable HAc conversion near 100.0% and a hydrogen yield at 2.6 mol-H 2 /mol-HAc in a 30-h test. Meanwhile, the Ni-2Sm-Al-O catalyst shows resistance to oxidation , sintering and coking; this improved reactivity and durability can be attributed to basic Sm oxides and ordered mesoporous framework with confinement effect : the basic sites are beneficial to adsorption and activation of HAc, and the ordered mesoporous framework constrains the thermal agglutination of Ni metal and formation of coking, while intermediate carbonous species of *CH x (x = 0–3) can be gasified via the Sm 2 O 3 -Sm 2 O 2 CO 3 cycle. These Sm-promoted Ni-based catalysts are also tested with different temperatures and O/C, and show potentials in ATR of HAc for hydrogen production.
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高影响因子
MATERIALS LETTERS
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2019
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IF 3.019
Kai Xu,Xiaohong Chen,Honglei Zhou,Liming Bi,Shaoli Fu,Wei Li,Xinkuan Liu,Fengcang Ma,Ke Zhang,Ping Liu
CNTs/Cu-Al 2 O 3 composite powders were successfully synthesized by in situ CVD using Cu-Al 2 O 3 composite powders obtained by internal oxidation of Cu-Al alloy powders. The multi-walled CNTs are obtained without agglomeration and stand on the surface of the composite powders. One end of the CNTs is well bound to matrix. The Cu nanoparticle was the catalyst for the growth of CNTs on the composite powders and Al 2 O 3 on the surface of the Cu-Al 2 O 3 powder plays a key role in the growth process.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2015
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IF 2.133
Tianfu Zhang,Zhen Wang,Guoping Li,Yunjun Luo
A bottom-up approach combining soft template self-assembly with sol–gel process, was adopted to prepare the assembled Al/Fe 2 O 3 nanoenergetic materials, assembly-Al/Fe 2 O 3 sample. The other two unassembled Al/Fe 2 O 3 a nanoenergetic materials, sol–gel–Al/Fe 2 O 3 sample and mixing-Al/Fe 2 O 3 sample, were prepared by sol–gel method and physical mixing method respectively. The assembly process within the preparation of the assembly-Al/Fe 2 O 3 sample was analyzed through the changes in the average hydrodynamic diameters of the particles and the micelles in solution. SEM, EDS and TEM tests were performed to demonstrate a significant improvement regarding to dispersity and arrangements of the Al and Fe 2 O 3 particles in the assembled samples, compared to that of the unassembled Al/Fe 2 O 3 samples. DSC test was employed to characterize the reactivity of the samples. The heat release of the assembled Al/Fe 2 O 3 sample was 2088 J/g, about 400 and 990 J/g more than that of the sol–gel–Al/Fe 2 O 3 sample and mixing-Al/Fe 2 O 3 sample, respectively.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Silong Wang,Zhihua Sun,Yuhao Wang,Taixin Liang,Baoguo Wang,Chunfang Fan,Yanjun Chen,Changcheng Liu,Que Huang
CuS-based composites are widely used in the fields related to photothermal energy storage and electromagnetic shielding and are excellent candidates for composites with phase change materials. To meet the requirements of micro-integration and electromagnetic resistance of electronic products and optimize the thermal management of electronic products, it is necessary to prepare new flexible composite phase change materials. In this paper, through the design of MPC@Ni Al-LDH/CuS double-layer structure, two-step vacuum filtration method is used, and the highly conductive materials CuS and MPC are introduced into the manufacture of PCM films. With the help of Ni Al-LDH, flame retardancy is introduced. The electromagnetic wave absorption performance is enhanced, and the existence of nano-cellulose (CNF) makes the film have excellent mechanical properties. Ni Al-LDH/MPC and CuS substrates with stable and high mechanical properties are prepared by ultrasonic treatment. According to scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC) and thermogravimetry (TG) characterizations, PEG successfully entered the MPC/CuS skeleton by vacuum filtration, and flexible phase change composite bilayers (MLPC) were obtained. Due to the synergistic effect of structure and components, the obtained composite film has many different excellent functions. Specifically, when MPC@Ni Al-LDH is 15 wt%, the phase transition enthalpy, thermal conductivity, electromagnetic shielding, and electrical conductivity are 146.8 J/g, 1.07 W/m·K, 38.8 dB and 126.4 S/m, respectively. The 3600 s infrared temperature measurement results show that the sample has stable thermal properties. Due to the presence of CuS, when MPC@Ni Al-LDH is 5 wt%, its absorbance can be kept at 1.51 L/(g·cm), and its photothermal conversion efficiency can reach 90.6 %. The MPC/CuS structure in the composite film provides many heat transfer channels, which reduces the phonon scattering in the heat transfer process and significantly increases thermal conductivity. Therefore, this multifunctional flexible phase change film can be used in photothermal conversion devices and for thermal management of electronic equipment, and it has broad application prospects in wearable equipment design due to its excellent electromagnetic shielding ability and infrared thermal stealth ability.
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高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Jinmei He,Yuqing Wang,Leihuan Mu,Jiehui Li,Yurou Dong,Ying Zhang,Yuan Deng,Pu Feng,Mengnan Qu
Hydrogen is regarded as “the ultimate clean energy source”, with the virtues of zero pollution, renewability and abundant reserves, which is expected to alleviate problems including global climate change and energy crisis. Designing reasonable methods for synthesizing efficient, inexpensive, and stable electrocatalysts for water splitting is urgently needed. In this study, we construct Al-FeCoP nanosheet array on nickel foam (Al-FeCoP/NF) with superhydrophilic/superaerophobic properties. The superhydrophilic and underwater superaerophobic surface accelerate the electrolyte penetration and bubble dissipation, thereby taking the edge off the “bubble shielding effect”. The electronic structure of the electrocatalyst is tuned through heteroatom doping and phosphorization, which effectively enhances the conductivity of the catalyst. Strikingly, the resulting Al-FeCoP/NF electrode shows remarkable activity in alkaline media, which only requires an overpotential of 121 mV and 215 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. When applied for overall water splitting, the assembled two-electrode electrolyzer only needs a low voltage of 1.56 V to afford a current density of 10 mA cm −2 and can maintain over 100 h without the obvious activity attenuation, which enhances the overall catalytic activity and represents superior long-term stability. In addition, the abundant wind and solar energy resources are employed to generate electricity directly, which is subsequently convert into green hydrogen by the water electrolysis in laboratory conditions. This work provides a new idea for the manufacture of low-cost, high-activity bifunctional transition-metal phosphide electrocatalyst by element doping for green hydrogen production.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yongyang Zhu,Liming Zeng,Daifeng Wu,Renheng Tang,Qing Zhou
The lack of cost-effective regeneration techniques for LiBH 4 limits its large-scale applications for supplying hydrogen via hydrolysis. Now, we report a facile method to regenerate LiBH 4 by ball milling its real hydrolytic byproduct (LiBO 2 · x H 2 O) with cheap Al based reducing agents, instead of traditional Mg. Effective strategies are developed to promote the formation of LiBH 4 by introducing Li 2 O to enable the dense Al 2 O 3 to convert into LiAlO 2 on Al surface and break up passivation layers, and by partially replacing Al with Al-RE alloy to improve grinding and contacting efficiency of raw materials and facilitate the conversion from initial H + in LiBO 2 ·2H 2 O to final H ¯ in LiBH 4 . A yield of 10.4 % can be obtained for a relatively short ball milling time (10 h) for the Al-Al 2 Ce-Li 2 O-LiBO 2 ·2H 2 O system. Another advantage of this method is that the utilization of H + source in LiBO 2 ·2H 2 O improves energy efficiency and reduces the cost. This work broadens the species of reducing agents for borohydride regeneration and enriches its regeneration methods.
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高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Shaorong An,Qiang Jin
The development of highly dispersed metal-based materials loaded on carbon is of great importance for environmental remediation. However, their catalytic activities face huge challenges. In this study, a series of super activated carbon-supported Fe-Al layered double hydroxides (FeAl-LDH@SAC x ) were prepared, and the peroxymonosulfate (PMS) oxidation performance and activation mechanism were probed with Rhodamine B (RhB) as a representative pollutant. Results showed that FeAl-LDH@SAC 0.02 composites exhibited superior ability in activating PMS compared to other catalysts, as evidenced by the rate constants for RhB degradation, which followed the order: FeAl-LDH@SAC 0.02 (0.5507 min −1 )>FeAl-LDH@SAC 0.04 (0.4738 min −1 )>FeAl-LDH (0.4121 min −1 )>FeAl-LDH@SAC 0.01 (0.3512 min −1 )>FeAl-LDH@SAC 0.08 (0.2701 min −1 ). The optimal doping amount for SAC depended on the ratio of active FeAl-LDH and its dispersion on the SAC, which helped to promote interfacial electron transfer. Impressively, the sulfate radicals (SO 4 · − ), hydroxyl radical (·OH), and singlet oxygen ( 1 O 2 ) made major contributions to RhB removal. The results of the toxicity assessment showed that the overall toxicity of the system tended to decrease as the catalytic oxidation proceeded. Finally, the effective removal of aromatic proteins and soluble microbial metabolites in actual dye wastewater within 60 min demonstrated that the catalytic oxidation system involving FeAl-LDH@SAC 0.02 was promising for water treatment.
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OPTICAL MATERIALS
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2024
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IF 3.8
Renjie Jiang,Jie Chen,Mingqin Li,Yanna Tian,Shiji Shen,Xuan Yang,Yanru Tang,Yan Sun,Hui Lin,Shengming Zhou
Ce: YAG- Al 2 O 3 composite ceramics are regarded as highly promising materials for laser illumination application due to their high luminous efficacy and thermal stability. Nevertheless, the Ce: YAG ceramics exhibit limited color rendering index (CRI) for indoor lighting due to their low red emission component. In this study, we synthesized high-performance Ce, Mn-doped (Y, Tb) 3 Al 5 O 12 –Al 2 O 3 composite ceramic phosphors via a vacuum solid-state sintering method. It was observed that the introduction of Mn 2+ ions created a second luminescence center with an emission peak centered at 580 nm. As the Mn 2+ concentration increased, the emission peak redshifted from 580 nm to 591 nm, leading to a significant enhancement in the color rendering index of the ceramics. The cross-energy transfer between Tb 3+ and Mn 2+ , Ce 3+ ions augmented the absorption and conversion of blue light by the ceramics, thereby reducing the correlated color temperature greatly. Based on these findings, ceramics with a Ce 3+ concentration of 3 at% and a Mn 2+ concentration of 4 at% exhibited the highest CRI values (81.3 and 75.6) under both laser excitation and LED excitation, establishing them as strong candidates for achieving high color rendering in white LED/LD illumination applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yang Zhang,Hanjun Wu,Zhenyue Zhang,Wenda Guo,Junxia Yu,Rongying Zeng,Ruan Chi,Zhiquan Pan
In this work, Ca-Al LDHs were modified via co-precipitation method utilizing two distinct chemical forms of adipic acid (adipate salt and adipic acid) as intercalation agents, with the resulting materials denoted as At-LDHs (adipate-intercalated LDHs) and Aa-LDHs (adipic acid-intercalated LDHs). The results indicated that At-LDHs and Aa-LDHs all exhibit a sheet-like porous structure stacked with each other. Due to the different synthesis conditions, the sheet structure of Aa-LDHs is smaller than that of At-LDHs. The kinetic and isotherm simulation results indicated that the capture capacity of At-LDHs for Mn 2 + was up to 227.53 mg·g −1 when the pH value was 7, while that of Aa-LDHs for naphthol green B reached to 132.73 mg·g −1 at a pH value of 9. The kinetic and thermodynamic simulation results indicated that the capture of Mn 2+ by At-LDHs conformed to the pseudo-first-order kinetic model and the Langmuir isotherm model, and the capture of naphthol green B by Aa-LDHs conformed to the Elovich kinetic model and the Temkin isotherm model. In addition, the capture process of both was a spontaneous exothermic reaction. Benefiting from the excellent adsorption properties of At-LDHs composites (Ion exchange, electrostatic attraction, adsorption precipitation, functional group chelation), the adsorption effect on Mn 2+ was better. Aa-LDHs have good adsorption effect on naphthol green B in solution through electrostatic attraction, dipole-dipole hydrogen bond, Yoshida hydrogen bond and n-π interaction. At-LDHs and Aa-LDHs have great potential to be employed as the materials for the removal of organic and inorganic composite pollutants from wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Muhammad Mubeen,Jingmao Zhao,Mohammad Tabish,Jingbao Wang,Mubashar Mahmood,Hassan Murtaza,Muhammad Jawad,Baomin Fan,Ghulam Yasin
Dual threats of over-film (degradation) and under-film filiform corrosion (FFC) pose a significant challenge to the reliable application of Zn-Al-Mg coated steel (ZAM-steel), necessitating the development of effective protection strategies. This study introduces a novel MRS@GO nanohybrid, integrated within epoxy (EP) coatings, to enhance the corrosion resistance of ZAM-steel in 3.5 wt% NaCl solution. The hierarchical structure of MRS@GO synergistically combines the barrier properties of an insulating material (MRS) with the electrochemical benefits of a conducting material (GO), providing superior protection. This dual functionality significantly improves the overall performance and durability of ZAM-steel, making it a promising candidate as the decorative coating for the automotive industry.
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高影响因子
危险品化学品经营许可证（带存储）