NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 8
·3140-3146
·
IF 2.5
Huashuan Li,Lumin Liao,Tianhao Zhou,Kaixiang Ren,Shichang Han,Tianyu Zhu
Al-based composites have emerged as promising hydrogen generation materials due to their high yield and low cost, yet slow hydrogen generation kinetics have impeded their widespread application. In this study, a series of novel Al–BixMy composites were synthesized via high-energy ball milling, with the Al–15 wt% Bi2Se3 composite demonstrating superior hydrogen generation performance. Achieving an unprecedented catalytic efficiency at ambient conditions, this composite reached a maximum hydrogen generation (MHG) rate of 1139 mL g−1 min−1 and completed hydrogen generation within 5 min with a 97.6% conversion yield. Through comprehensive characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), in situ Se and Bi were found on the fresh Al surface. Density functional theory calculations (DFT) elucidated the mechanism by which Bi doping enhances water adsorption and the cleavage of O–H bonds. These findings provide important insights for the design of high-performance Al-based hydrogen generation materials with improved kinetics and efficiency.
研究领域:
材料科学
·
氢能
·
催化
·
纳米材料
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DOI
高影响因子
SURFACE ENGINEERING
·
2020
·
IF 2.433
Jun Xing,Yingjie Chen,Chen-yun Yu,Ming-an Chen
For micro-arc oxidation (MAO) coating on aluminium alloys, the corrosion medium can permeate through the microvoids and cracks in it to decrease its corrosion resistance. In this study, a method of two-steps hydrothermal synthesis has been developed to prepare a composite coating by the synthesis of zeolite film on MAO-coated Al alloy substrate. The zeolite crystals are well intergrown into a continuous film and the micro defects in the MAO coating are sealed. This kind of composite coating can provide excellent long-term corrosion protection to Al alloy substrate. The effect of the first-step hydrothermal synthesis on the microstructure of the MAO coating and zeolite film has been studied.
研究领域:
材料科学
·
腐蚀与防护
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高影响因子
Chinese Physics B
·
2022
·Vol. 31
·期 3
·037406
·
IF 1.652
Dong Yan,Lingyong Zeng,Yijie Zeng,Yishi Lin,Junjie Yin,Meng Wang,Yihua Wang,Daoxin Yao,Huixia Luo
The relationship between charge-density-wave (CDW) and superconductivity (SC), two vital physical phases in condensed matter physics, has always been the focus of scientists' research over the past decades. Motivated by this research hotspot, we systematically studied the physical properties of the layered telluride chalcogenide superconductors CuIr2−xAlxTe4 (0 ⩽ x ⩽ 0.2). Through the resistance and magnetization measurements, we found that the CDW order was destroyed by a small amount of Al doping. Meanwhile, the superconducting transition temperature (Tc) kept changing with the change of doping amount and rose towards the maximum value of 2.75 K when x = 0.075. The value of normalized specific heat jump (Δ C/γ Tc) for the highest Tc sample CuIr1.925Al0.075Te4 was 1.53, which was larger than the BCS value of 1.43 and showed the bulk superconducting nature. In order to clearly show the relationship between SC and CDW states, we propose a phase diagram of Tc vs. doping content.
研究领域:
凝聚态物理
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材料科学
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超导性
·
电荷密度波
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Xi Wu,Fei Ruan,Fenglong Zhang,Zhe Ren,Chonggui Lei,Yuwei Ma,Gaofei Pan,Weixiang Shang,Hongxia Li,Qingchun Wang,Jinxiao Bao
To study the electrochemical performance of aluminum doped CaHfO 3 proton conductors in more detail, the CaHf 1- x Al x O 3-δ ( x = 0.02,0.04,0.06,0.08) solid electrolytes were prepared by high-temperature solid-state method at the temperature of 1873K for 10 h. The XRD, SEM and EDS were used to test the phase structure and micro-morphology of the solid electrolytes, the Archimedes method was used to measure the density of the electrolytes, and the electrochemical workstation was used to test the performance of the electrolytes. The conductivity of the electrolytes in hydrogen, oxygen and water vapor atmospheres at 973–1373 K were measured by two-electrode AC impedance spectroscopy method, and the conductance activation energy of the electrolytes in different atmospheres were estimated based on Arrhenius' law. The H/D isotope effect of solid electrolytes were measured at 973–1273 K in H 2 and D 2 atmospheres, and the chemical diffusion coefficient and self-diffusion coefficient of hydrogen in the electrolytes were determined based on Fick's second law. The primary conducting carriers in different temperatures and atmospheres were revealed based on the conductivity test results. This study of aluminum-doped calcium hafnate electrolyte may provide reference for the research and development of calcium hafnate based proton conductors.
研究领域:
材料科学
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电化学
·
固体物理
·
能源材料
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Shu Panxiang Chen,Xiaoyu Sun,Xiao Luo,Zhiwu Liang
In this study, Li/Al hydrotalcite (HT) was treated with calcination and potassium hydroxyl-ethanol to form bcHT (basic-modified calcined hydrotalcite). This material was then polyethylenimine (PEI)-functionalized to create a new sorbent that has ultralow energy consumption. Various methods were applied to characterize the sorbent, including N2 adsorption–desorption, Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. CO2 adsorption capacity, which was affected by PEI loadings and adsorption temperatures, was assessed with the CO2 adsorption isotherms and cyclic CO2 adsorption–desorption performance. Results showed that the optimal CO2 adsorption capacity of 1.723 mmol/g was reached when operating with temperature of 323 K and PEI loading of 40%. The Freundlich model was applied to provide optimal correlations with the experimental data, and the correlation coefficients reached 0.997. The average isosteric heat of CO2 adsorption was calculated to be 67.492 kJ/mol. The relatively low desorption energy consumption was calculated to be 63.20 kJ/mol with the Amenomiya equation. Four kinetic models were applied to analyze the kinetics of PEI-functionalized bcHT, and both the Avrami’s fractional order model and DEM model were well fitted to the experimental data. The activation energy of the bcHT-PEI-40% was 30.34 kJ/mol calculated by the Avrami’s fractional order model, which is obviously lower than the values of the CO2 adsorption with traditional amine solution.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Shiyou Xing,Pengmei Lv,Junying Fu,Jiayan Wang,Pei Fan,Lingmei Yang,Zhenhong Yuan
A series of pore-broadened Al-SBA-15 samples were synthesized using a direct hydrothermal method . The effects of aluminum incorporation, assembling temperature, and co-solvent (1,3,5-trimethylbenzene (TMB)) content were investigated by low-angle XRD , N 2 adsorption and desorption isotherm analysis, SEM, TEM , NH 3 -TPD, FTIR, pyridine-IR, and 27 Al NMR. The results indicated that aluminum incorporation (Si/Al ratio = 10) increased the pore size of SBA-15 from 5.66 to 10.13 nm. A small pore size of 6.55 nm was observed at a low assembling temperature of 30 °C, attributing to the inadequate stretching of the molecular template. An increased pore size of 8.45 nm was obtained at an assembling temperature of 60 °C because of the partial hydrophobization of the hydrophilic groups , whereas a high temperature of 70 °C resulted in the generation of least ordered pores. The hydrophobic co-solvent TMB showed a significant broadening level as a result of its effective fusion into the hydrophobic micelle cores. A highly ordered pore framework with a pore size of 18 nm was obtained at a TMB/P 123 ratio of 0.25, which was found to be optimum. More or less TMB led to the generation of mesocellular silica-aluminum foams with a complete loss of regularity. The 27 Al NMR results showed that aluminum was mostly tetrahedrally coordinated. The NH 3 -TPD and pyridine-IR detection results indicated that a number of weak and medium acid sites (as Bronsted and Lewis acid sites) existed in Al-SBA-15 pore-broadened by TMB.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 17
·10723-10728
·
IF 10.733
Hao Zhong,Liuzhang Ouyang,Meiqin Zeng,Jiangwen Liu,Hui Wang,Huaiyu Shao,Michael Felderhoff,Min Zhu
The regeneration of sodium borohydride (NaBH4) is crucial to form a closed cycle after it either supplies hydrogen energy via a hydrolysis process or provides energy through electron transfer at the anode of direct borohydride fuel cells (DBFCs). In both of these cases, the spent fuels are NaB(OH)4 from NaBO2 aqueous solution. However, the current regeneration process from (NaB(OH)4)·xH2O to form NaBH4 by reduction reaction and calcination at high temperature with metal hydrides as reducing agents is very expensive. In this work, we developed a simple regeneration process via ball milling with Mg–Al alloys as the reducing agent for NaB(OH)4 under an argon atmosphere. Under optimized conditions, a high yield of about 72% of NaBH4 could be obtained. Mechanistic study showed that all the hydrogen atoms from NaB(OH)4 remain in NaBH4 and no additional hydrogen sources are needed for the reduction process. The inexpensive Mg–Al alloy works as a reducing agent transforming the H+ to H− in NaBH4. This approach demonstrates a ∼20-fold cost reduction compared with the method using metal hydrides. This opens the door to the commercial implementation of simple ball milling processes for the regeneration of spent NaBH4 from NaB(OH)4 with cheap reducing agents.
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Bin Hu,Wenchao Zhang,Chunpei Yu,Zilong Zheng,Yajie Chen,Jiaxin Wang,Jingping Liu,Kefeng Ma,Wei Ren
The CuO micro/nanowires film has been prepared successfully on a Cu substrate using a combination of an electrochemical anodization and an annealing treatment. Its morphology and phase composition have been systemically examined. The vertically aligned CuO micro/nanowires can form a skeleton to facilitate the embedment of Al nanoparticles so that their interfacial contacts will expand significantly to increase the total energy release. The CuO micro/nanowires can be used to synthesize the Al/CuO composite thermite film using an electrophoretic deposition of Al nanoparticles. The thermal analyses reveal that the Al/CuO composite thermite film can release a heat output of 2009 J·g–1 at 10 min deposition. This work develops an effective protocol for the synthesis of the Al/CuO composite thermite film, which is highly compatible with microelectromechanical systems to realize functional energetic chips.
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DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2018
·Vol. 29
·期 2
·404-411
·
IF 1.444
Song Jia-Xing,Fang Xiang,Guo Tao,Bei Feng-Li,Ding Wen,Zhang Xiao-Nan,Yao Miao,Yu Hong-Jun
In this work, thermal properties and kinetics of Al-nanoparticles/α-MnO2 nanorods thermite were reported. The α-MnO2 nanorods were synthesized using a hydrothermal method and were characterized by X-ray powder diffraction (XRD) and X-ray photoelectron spectra (XPS), then combined with Al nanoparticles based on the ultrasonic mixing method to prepare the nanostructure thermite. Besides, both pure components and mixture were characterized by field emission scanning electron microscopy (FE-SEM) to observe their morphologies and structures. Subsequently, the thermal properties of Al/α-MnO2 nanostructure thermite were studied on the basis of thermogravimetric-differential scanning calorimetry (TG-DSC). According to the TG-DSC tests, the calculation results of activation energy for kinetics of Al/α-MnO2 thermite were obtained using different isoconversional methods. It was found that Al/α-MnO2 nanostructure thermite has high heat release and low onset temperature, and the heat release of the nanostructure thermite was approximately 1146.6 J g -1.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Ce Zhang,Yunchuan Qi,Shengtang Liu,Yi Men,Fangming Cui
A kind of mesoporous Al-doped TiO 2 with high specific surface area (223.4–336.0 m 2 g −1 ) was prepared by a simple sol-gel process and presented an improved lithium storage performance compared with that of the mesoporous TiO 2 . The alcoholysis and condensation of AlCl 3 in ethanol introduced/doped the Al 3+ ions into the anatase lattice, which stabilized the anatase nanocrystals and introduced oxygen vacancies in the materials, giving an improved specific surface area and reduced impedance of the material and electrode.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Li Ding,Xuepeng Wang,Shanxin Yang,Wenda Xu,Yongde Yan,Yun Xue,Fuqiu Ma
In order to reveal the extraction mechanism of Nd on Ga-Al alloy electrode, the electrode reactions and alloy formation between Nd(III), Ga(III) and Al(III) ions in different molten salt systems were studied by multiple electrochemical methods. The cyclic voltammetry curves measured in melts with different concentrations confirmed that only three intermetallic compounds were formed in both Ga-Nd and Al-Nd systems. The preferential interaction of Nd with Ga in Ga-Al-Nd ternary system was further verified by cyclic voltammetry curves with varying potential window. In particular, the co-reduction process of three ions was gradually determined by the comparison of electrochemical behaviour in different melts. In addition, the interfacial reaction of Nd(III) ion on liquid Ga-Al alloy cathode was investigated, and the corresponding exchange current densities were measured through galvanostatic pulse (0.0049, 0.0047, 0.0056 and 0.0055 A cm −2 ) and Tafel method (0.0029 A cm −2 ).
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高影响因子
Science China-Materials
·
2022
·Vol. 65
·期 12
·3452-3461
·
IF 8.64
Yang Lin,Yu Jinxing,Chang Shufang,Xu Xiaoxiang
LaTaON 2 is an attractive visible-light-active photocatalyst for water splitting due to its broad visible light absorption as far as 650 nm and proper band edge positions. Notwithstanding these promising properties, LaTaON 2 generally exhibits poor photocatalytic activity because of its high defect concentration that severely hinders charge separation. Here, LaTaON 2 has been modified by doping Al into the Ta sublattice, i.e., LaTa 1− x Al x O 1− y N 2− y (0 ≤ x ≤ 0.20). Al doping not only inhibits the defect concentration and increases surface hydrophilicity but also maintains the desired visible light absorption of LaTaON 2 . These important modifications substantially ameliorate the charge separation conditions within LaTaON 2 and are responsible for a much enhanced photocatalytic performance for water redox reactions under visible light illumination. Under optimal conditions, the Al-doped LaTaON 2 delivers an apparent quantum efficiency of 1.17% at 420 ± 20 nm for water oxidation into O 2 , outperforming most LaTaON 2 -based photocatalysts. These findings highlight Al as a useful dopant to open up the photocatalytic potential of metal oxynitrides whose activity is often undermined by a high defect concentration.
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高影响因子
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