MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Enbo Li,Yu Bai,Peng Zhang,Hongxia Liu,Wen Ma,Yingwei Qi,Te Wang,Ziqian Zhang,Sinan Gao
Electronic structure adjustment on materials' surfaces often leads to materials obtaining novel performances. Flake Al powder is a classical low infrared emissivity material at room temperature. However, this powder shows intense infrared radiation over 500 °C due to its high-temperature oxidation , which restricts flake Al powder's application as low infrared radiation material in higher temperatures. For this reason, the Al@ZrO 2 composite was prepared by a solvothermal method to improve its thermostability. This composite can be used as low infrared radiation material over 500 °C for the long term, even at 700 °C for a short time. According to the experimental and theoretical investigation, a delocalization bond of Al–O–Zr is formed in the interface between the Al surface and ZrO 2 so that the Al surface's electronic structure is adjusted. This change of electronic structure weakens the electroaffinity of Al atoms to bond with the electron-rich groups, and the oxidation reaction of Al needs to proceed in a higher-temperature range. In this case, flake Al powder coating with ZrO 2 holds its metal properties with low infrared emissivity over 500 °C. The Al@ZrO 2 composite could be used in a higher temperature range as a low infrared radiation material.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 35
·12296-12307
·
IF 4
Yan Wang,Yong Zhang,Xiaolin Liu,Sen Sun,Shiyi Qin,Jiaqi Huang,Bowei Chen
Herein, magnetic layered double oxides coated with carbon dots (MLCs) were synthesized through introducing sodium dodecylbenzene sulfonate and FeCl2 into Co/Al LDH for capturing uranium from aqueous solution. When the molar ratio of Co to Al was 4 : 1, the MLC composite possessed the strongest affinity to uranium(VI) in solution with short equilibrium time (<160 min), high adsorption efficiency (94.31%) and large removal capacity (513.85 mg g−1). The adsorption behavior of MLCs for uranium(VI) was well fitted with Langmuir and pseudo-second-order models, suggesting that the monolayer chemical adsorption was the rate-limiting step. Besides, MLC-3 could be reused by using 0.15 mol L−1 ethylene diamine tetraacetic acid as an eluent and the removal percentage still remained at a high level (>83.3%) after 5 adsorption/desorption cycles. Redox reaction, chemical complexation and electrostatic attraction were proved to play significant roles in uranium(VI) separation. Therefore, MLC-3 could be used as a potential adsorbent in uranium(VI)-containing wastewater treatment due to its excellent adsorption performance for uranium(VI).
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PubMed
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 40
·e202203035
·
IF 2.307
Yuxiu Fu,Yaming Pang,Yinan Zheng,Xiaoli Song,Liguo Gao
Graphical Photocatalysts enhance the ability to absorb low-energy photons due to the reduction of the band gap. Through the photocatalytic mechanism, it is known that when there is irradiation with light (hv) energy entering Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -Layered double hydroxides (LDHs), highly active hole-electron pairs will be generated, and a large amount of ⋅OH will be generated after the reaction, which can completely oxidize the phenol in water into CO 2 and H 2 O. Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -Layered double hydroxides (LDHs) materials were successfully prepared via a hydrothermal method by doping Mo 6+ in hydroxide laminates and inserting MoO 4 2− to replace the interlayer anions of LDHs materials. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectrometer (FTIRS) and ultraviolet-visible spectrophotometer (UV). The electronic density of states was calculated using the density functional theory (DFT) of Vienna Ab-initio Simulation Package (VASP). The effects of Mo 6+ and MoO 4 2− on the structure, morphology, electronic structure and photocatalytic performance of Mg 2+ -Al 3+ -LDHs were systematically studied. The conditions for phenol degradation by Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -LDHs were optimized by single factor analysis and response surface methodology. The results show that the MoO 4 2− anion reduces the band gap width and thus enhances the absorption of low-energy photons. The interaction between cations and anions enhances the photocatalytic performance. When the dosage of Mg 2+ -Mo 6+ -Al 3+ -MoO 4 2− -LDHs was 0.03 g, the temperature was 40 °C and the visible light irradiation was 15 min, the removal rate of phenol reached 94.76 %.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yanghuan Huang,Haocheng Zhang,Lou Gao,Tianlan Yan,Yueer Yan,Yahong Zhang,Yi Tang
A series of Zr–Al-MWW zeolites with different Zr state and layer-stacking structure are successfully synthesized via direct grafting zirconocene dichloride onto the external silanols of three kinds of MWW zeolites, i.e. MCM-22 with multilayered structure, ITQ-2 (through layer delaminated route) and OL-MWW (by direct hydrothermal synthesis) with oligolayered structure. The structure, porosity and state of grafted Zr species are distinctly different among the three Zr–Al-MWW zeolites. Zr-OL-MWW possesses the highest content of single Zr atoms with an ideal micro-meso-macro pore system, while Zr-MCM-22 and Zr-ITQ-2 contain two kinds of Zr species (ZrO 2 clusters and single Zr atoms) coexisting in various proportions. The high dispersion of single Zr atoms on OL-MWW can be assigned to the large amount of external silanols of OL-MWW. The as-prepared three bi-functional Zr–Al-MWW zeolites are used for the cascade Meerwein-Ponndorf-Verley (MPV) reduction and etherification (ETH) reaction. Among them, Zr-OL-MWW shows dramatically higher conversion of cinnamaldehyde and yield of 1-cinnamyl 2-propyl ether than Zr-MCM-22 and Zr-ITQ-2, owing to the higher catalytic activity of Lewis acid centers from single Zr atoms, as well as more integrated framework Al sites as Brønsted acid centers with good accessibility. This study offers a simple and efficient strategy to construct Lewis-Brønsted acidic zeolites with exposed heteroatom sites and integrated framework structure, which will provide especial potential in the catalytic conversion of macromolecules.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ling Yang,Lei Sheng,Xingxu Gao,Xin Xie,Yaozong Bai,Gaojun Liu,Haoyu Dong,Tao Wang,Xianli Huang,Jianping He
Lithium metal batteries (LMBs) with ultra-high theoretical energy density are a prospective candidate to replace current lithium-ion batteries (LIBs). However, there are still two non-negligible problems of lithium dendrites and the volume expansion effect of LMBs. In this study, reduced graphene oxide (rGO)/Li-Al-LDH composite nanosheets were firstly prepared via a hydrothermal method and then vacuum filtered onto commercial polypropylene (PP) separator. This kind of rGO/Li-Al-LDH nanosheets layer is expected to improve the wettability of liquid electrolytes and thermal stability. Furthermore, rich- Li-Al LDH can promote more ionic carriers and channels, which exhibits higher-efficiency lithium-ion transport properties. Meanwhile, rGO with a graphitic-like structure is able to disperse the concentration of electrons at the sharp point when lithium dendrites arise. As a result, the discharge capacity of the Li||LiFePO 4 cells based on the rGO/Li-Al-LDH@PP separator is still 1.852 mAh after 250 cycles and the capacity decay rate is just 4.24%. It is demonstrated that a feasible and effective strategy for the modified separator can enhance the electrochemical performance of LMBs.
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Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 11
·2313-2321
·
IF 5.2
Hong-Qing Fu,Haifang Mao,Chaoyang Wang,Kun Yin,Miaomiao Jin,Zhenbiao Dong,Yun Zhao,Jibo Liu
Aimed at greenhouse gas CO2 high value-added utilization, a N,N′-(propane-1,3-diyl)dipicolinamide (PPPA) supported Al(III) metal–organic polydentate chelate complex (Al-PPPA) was designed and used to efficiently catalyze CO2 to cyclic carbonates. The substrate conversion and product selectivity were more than 95% and 98%, respectively, at 120 °C and 2 MPa CO2 without the presence of a co-catalyst. After 5 times of recycling, the substrate conversion was no less than 88%, which indicated the excellent thermal stability and reusability of the catalyst. Simultaneously, the catalyst showed a widely universal range of substrates including olefin chains, phenyl chains, internal epoxides and fluorine-containing epoxides. Furthermore, the plausible mechanism of the CO2 cycloaddition reaction was explored by employing in situ IR technology. The ring opening of PO, CO2 activation and the formation of the final products were examined visually. This work supplies a new route for the theoretical and experimental exploration of new catalyst design and process understanding for efficient greenhouse gas reuse.
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高影响因子
COMBUSTION AND FLAME
·
2022
·
IF 5.767
Wen Ao,Zhan Wen,Lu Liu,Yang Wang,Yu Zhang,Peijin Liu,Zhao Qin,Larry K.B. Li
In this experimental study, we explore how the combustion and agglomeration characteristics of solid propellants can be modified by replacing aluminum with ternary Al/CuO/PVDF(Polyvinylidene Fluoride) metastable intermolecular composites (MICs). Using thermogravimetric−differential scanning calorimetry, a laser ignition setup, and a high-pressure propellant combustion system , we examine the thermal reactivity, ignition behavior, burning rate, agglomeration, and condensed combustion products of various MICs-inclusion propellants. We find that the use of ternary Al/CuO/PVDF MICs can decrease the onset temperature and increase the oxidation efficiency of Al, as compared with common binary MICs. The ratio of CuO/PVDF is found to have a strong effect on the combustion intensity of the metallic powders , but only a weak effect on their ignition delay . Higher proportion of PVDF is found to have a negative effect on the combustion rate. Specifically, the combustion intensity is found to decrease first and then increase as the PVDF content increases. The exothermic Al/CuO reaction is found to alter the heat transfer of the condensed layer on the propellant surface, while PVDF plays a critical role in the thermal feedback of the gaseous reaction. When combined, these two factors lead to a ± 30% variation in the propellant burning rate. Furthermore, ternary MICs are found to reduce agglomeration during propellant combustion. The two optimal formulations are 2.5 wt.% CuO/2.5 wt.% PVDF and 3.5 wt.% CuO/1.5 wt.% PVDF. The use of these formulations is found to decrease the mean particle size of the condensed combustion products to only 11 μm, as compared with 76 μm for the original Al-inclusion propellant. High-speed microscope images reveal the existence of crack phenomena in the pockets surrounding the AP particles on the burning surface due to the Al/CuO reaction, as well as the floccule breakup mechanism of Al aggregates in the presence of PVDF, both of which reduce agglomeration. Overall, this study shows that replacing Al with ternary Al/CuO/PVDF MICs has significant effects on the agglomeration, combustion and ignition features of aluminized propellants. The findings of this study can be used to aid the development of highly adjustable functional catalysts for solid propellants.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6262-6272
·
IF 2.779
Guo Xiaogang,Liang Taotao,Liu Guixiu,He Yuanzhen,Kong Shuying,Islam Md. Labu,Yuan Binfang
Achieving controllable film-forming process is always a difficult issue for practical application, especially for bi-/multiple component composite materials. Thus, this paper firstly developed a conveniently and controllable electrophoretic assembly technique under mild conditions to design nano-Al-doped@Co 3 O 4 energetic film with wide potential applications. The stable suspension consists of isopropyl alcohol with the tracing of polyethylenimine and tween 80. The high crystallinity and uniformity of structure in target films were demonstrated by FESEM, EDX, XRD, and FT-IR techniques. Electrophoretic assembly dynamics of Al/Co 3 O 4 particles were deeply explored to provide a theoretical foundation for optimizing exothermic performance. The exothermic performance of target film can be accurately adjusted, and the output of heat ( Q ) and activation energy ( E a ) can reach up to ~ 3.6 kJ/g (close to 85% of theoretical value) and low to 230.01 kJ/mol, respectively. This breakthrough will substantially push forward the facile functional film-forming process of different kinds of particles used in fields of electronics, military, aviation, etc.
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Nanoscale
·
2022
·Vol. 14
·期 6
·2427-2433
·
IF 8.307
Shangchun Lv,Mengxi Pei,Yuxiang Liu,Zhichun Si,Xiaodong Wu,Rui Ran,Duan Weng,Feiyu Kang
Hydrogen production from overall water splitting using SrTiO3(Al)-based semiconductors is one of the most promising routes to address energy and environmental concerns. Noble metals are needed to accelerate water splitting by promoting the charge transfer and providing active sites. However, noble metal-based catalysts have high prices and rare resources. Herein, we demonstrate a strategy to construct highly active CoxP/SrTiO3(Al) for overall water splitting. Hydrothermal method followed by an ultrasonic process was applied to prepare CoxP dots, which were loaded on the whole surface of SrTiO3(Al) as bifunctional cocatalysts. Interestingly, the CoxP dots on the (110) planes of SrTiO3(Al) were partially oxidized for the OER reaction. However, CoxP dots on the (100) planes of SrTiO3(Al) for HER kept it as it was. The as-prepared CoxP/SrTiO3(Al) photocatalyst shows a stable HER rate of 1.36 mmol−1 h−1 and OER rate of 0.635 mmol−1 h−1. The strong interaction between CoxP and SrTiO3(Al) not only facilitates rapid charge separation but also provides a highly active site for overall water splitting. Our study provides a valuable method for constructing noble-metal-free SrTiO3(Al)-based photocatalysts.
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高影响因子
MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Xudong Rong,Xiaofeng Chen,Dongdong Zhao,Xiang Zhang,Chunnian He,Chunsheng Shi,Naiqin Zhao
Age-hardening Al matrix composites (AMCs) exhibit great potential for developing advanced metal structural materials, while reinforcement configuration-dependent aging behaviors are still largely unclear. To gain an in-depth fundamental understanding of the effect of in-situ generated intragranular reinforcement on precipitation response, a systematical heat-treatment was applied for the in-situ generated Al 2 O 3 reinforced Al Cu composite prepared via powder metallurgical Al-5 wt% CuO (Al-5CuO) system. Results show that the nano-scale intragranular Al 2 O 3 activates the dislocation-assisted bulk diffusion pattern to promote the precipitation response, thus effectively shortening the peak-aging time of the composite as compared to the referenced Al-4 wt% Cu alloy matrix (Al 4Cu). The adequate precipitation within grains in the early-aging stage endows the peak-aged Al-5CuO composite with homogeneous size distribution of θ’ phase, contributing to the impressive mechanical properties . The mechanical analyses reveal that precipitation strengthening accounts for the prominent elevation of yield strength, while the enhanced ductility is achieved by decreasing the size and number density of precipitates segregated along reinforcement-matrix interface and grain boundary. This work yields new insights into intragranular reinforcement-driven precipitation response, which is crucial for designing age-hardening AMCs with high mechanical performance.
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COMBUSTION AND FLAME
·
2023
·
IF 4.4
Yuxiang Li,Kaili Zhang
Metastable intermolecular composites (MICs) comprising solid fuels and oxidizers at nano-scale exhibit high energy densities and fast reaction speeds. As most metal and metalloid fuels are passivated by the natural oxide layer on the surface which acts as a reaction barrier, fluorine-containing oxidizers are of particular interest to promote the reactivity through interfacial fluoridation. In this work, cobalt hydroxy fluoride (Co(OH)F) was introduced as a functional fluorine-containing oxidizer, and core-shell structured Co(OH)F@Al nanoarray was fabricated onto a glass substrate . The thermal behavior and reaction mechanism of pure Co(OH)F and Co(OH)F@Al composites were thoroughly investigated, and Co(OH)F@Al was compared with CoO@Al and Co 3 O 4 @Al with identical morphology. In the Co(OH)F@Al composite, a pre-ignition reaction was observed which was attributed to the etching of Al 2 O 3 shell by HF and the fluoridation of Al core by HF and CoF 2 . With the assistance of pre-ignition reaction, Co(OH)F@Al can complete main exothermal reaction before Al melting in a solid-state mechanism, and its peak temperature is around 200 ℃ lower than those of MICs employing CoO and Co 3 O 4 as oxidizers.
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2021
·
IF 2.991
Jinxia Wang,Xiangyue Liu,Hongwei Xie,Huayi Yin,Qiushi Song,Zhiqiang Ning
The magnetohydrodynamic (MHD) effect was usually used to improve the mass transport during electrodeposition in a solution electrolyte. Herein, we reported the effect of a magnetic field on the electrode process of Al electrodeposition in a [Emim]Cl-AlCl3 ionic liquid composed of pure ions. Under a uniform and perpendicular magnetic field to the Cu electrode plane, electrochemical impedance spectroscopy (EIS) of the circuit, the cyclic voltammetry (CV) curves, and the different capacitances at the potential of zero charge (PZC) were measured, and the electrodeposition of aluminum was carried out at a constant current density. The results indicated that a vertical magnetic field significantly reduced the resistance (activation energy) for charge transfer of electrochemical reduction of Al2Cl7–; meanwhile, the capacitance of an electric double layer (EDL) and the density of the electrodeposited aluminum layer were increased.
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高影响因子
危险品化学品经营许可证（带存储）