ENERGY
·
2019
·
IF 5.537
Xu Guan,Zheng Zhou,Ping Luo,Fengshun Wu,Shijie Dong
Aluminum metal needs to be activated to improve its hydrogen generation properties by using an inexpensive way for its wide adoption. Al-based composites activated by low-melting-point metals, oxides, and salts were prepared by high-energy ball milling and characterized using a range of instrumental analysis techniques. Uniform and orthogonal designs were chosen to optimize the components and mechanical alloying parameters of the Al-based composites, respectively, for improving their hydrogen generation properties and reducing cost. The results suggest that the Al-1.0 wt%Ga-1.5 wt%In-3.0 wt%SnCl 2 -1.0 wt%Bi 2 O 3 composite prepared using the parameters A 4 B 1 C 3 D 2 exhibited a hydrogen yield of 1172.3 mL g −1 and maximum hydrogen generation rate of 1030.5 mL min −1 g −1 at 25 °C and atmospheric pressure. The activation energy (E a ) of the hydrolysis reaction was calculated to be 20.0781 kJ mol −1 . Moreover, according to the Tafel curves, the corrosion potential of Al-based composites in water becomes more negative compared with that of pure Al, which could improve its hydrogen generation properties. Therefore, this new material could be used as hydrogen sources for fuel cells.
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DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Puxiang Yan,Haiyong Wang,Yuhe Liao,Pengyao Sun,Chenguang Wang
Catalytic valorization of biomass into chemicals and fuels plays a key role in order to achieve net-zero greenhouse gas emissions. Herein, a series of hierarchical ZSM-5 zeolites were synthesized by the post-treatment method to transform furfural alcohol (FAL) to levulinic acid (LA). ZSM-5 obtained from tandem alkaline treatment (0.2 M NaOH) and acid washing (0.1 M HCl), denoted as ZSM-5-OH 0.2 -H, exhibited the highest activity, affording 76.2% LA yield in 9:1 acetone–water mixed solvents at 393 K for 0.5 h. The enhanced adsorption capacity and acid accessibility of FAL on zeolite mediated by the introduction of mesopores, as well as the reduced secondary reactions of the generated LA due to few Al atoms in straight and sinusoidal channels (as confirmed by UV–vis diffuse reflectance), were responsible for the outstanding catalytic performance of ZSM-5-OH 0.2 -H. The structure–activity relationship revealed that regulating the porous structure and Al distribution of ZSM-5 was an effective strategy to enhance its hydrolytic performance of FAL to LA. Moreover, ZSM-5-OH 0.2 -H could be reused for three reaction cycles without significant loss in catalytic activity.
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DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Ningyun Hong,Kang Wu,Zhengjun Peng,Zenghu Zhu,Guofeng Jia,Min Wang
O3-type layered transition metal oxides have shown great promise as high-capacity cathode materials for sodium-ion batteries in large-scale energy storage, due to their low cost and the abundance of sodium resources. However, the limited interlayer spacing and the unstable structure of the O3 phase result in inferior cycling stability and poor rate capability, which could even hinder their practical application process. Hereby, we present that doping with nonelectrochemically active Al in NaAlx(Ni0.5Mn0.5)1–xO2 (x = 0, 0.02, 0.06, 0.1) can effectively alleviate these issues. Among these materials, materials with x = 0.02 exhibited the best electrochemical behavior with improved capacity and better cycling property than other materials. Specifically, the discharge capacity of a 2 mol % Al-doped material possesses 63.2% capacity retention after 200 cycles at a current density of 240 mA g–1, which is 21.4% higher than that in NaNi0.5Mn0.5O2. In addition, a 2 mol % Al-doped electrode also shows outstanding rate capability and delivers 90 mAh g–1 at a high rate of 480 mA g–1, compared to only 67 mAh g–1 for that of the pristine one. X-ray diffraction (XRD), cyclic voltammetry (CV), and galvanostatic intermittent titration technique (GITT) analysis elucidated that the introduced Al dopant can effectively improve the structural stability and promote kinetics of Na+ diffusion mobility. Therefore, the strategy of doping inactive aluminum elements for optimizing the electrochemical performance of NaNi0.5Mn0.5O2 was verified, which could also open an avenue for the design of other O3-type sodium cathode materials.
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高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Yujie Li,Yixing Wang,Zhenying Liu,Luyao Jiang,Hu Yang,Zhenliang Xu
Molecular separation of dye mixtures containing the same charge remains a challenge. In the present study, we prepared a composite membrane that could efficiently separate anionic dye mixtures. Briefly, Al-Metal-organic framework (Al-MOF) nanoparticles synthesized by the ion-exchange method were used as fillers during the in-situ synthesis of ethanolamine (ETA) grafted polyacrylonitrile (PAN) membrane. The optimized composite membrane showed a high rejection of congo red (CR) from a single solution (96% rejection) and the CR/methyl orange (MO) mixture (93%/18%) solution. The flux of dye mixture solution reached 180 L m −2 h −1 , higher than many reports in the literature. The further modification on pore size (heat treatment) or surface charge (hydrolysis treatment) improved the membrane performance to separate smaller dye mixture of methyl blue (MB)/MO. Both modified membranes showed a good MB rejection (93%) and flux of 70–85 L m −2 h −1 . While for the separation of the MB/MO mixture, the heat-treated membrane showed the lowest flux and a middling rejection. The surface hydrolyzed membrane showed a better selectivity (96% MB/32% MO) and a higher flux (127 L m −2 h −1 ) than that of the entirety hydrolyzed membrane (93% MB/58% MO and flux of 78 L m −2 h −1 ), which was attributed to their different charge distribution.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Zhaohui Han,Yang Xu,Shenggang Zhou,Peixian Zhu
Electrode materials with an Al-based coating and a Ti 4 O 7 ceramic interlayer were prepared by plasma spraying to obtain improved electrochemical properties . RuO 2 –TiO 2 coatings doped with Sn, Ta and Ir, or La were prepared by thermal decomposition. The results indicate that good bonding between Al and Ti 4 O 7 was obtained by plasma spraying . The dopants affected the electrochemical performance by changing the surface morphology of the active coatings. The addition of Sn not only improved the electrocatalytic activity in the chlorine evolution reaction but also inhibited the electrocatalytic activity in the oxygen evolution reaction . The electric potential distribution on the surface of the electrode materials with an Al-based coating and a Ti 4 O 7 ceramic interlayer was more uniform than that of a Ti/RuO 2 –TiO 2 anode. The results of electrowinning tests revealed that an Al/Ti 4 O 7 /RuO 2 –TiO 2 –SnO 2 anode exhibited the best anodic performance with lower energy consumption, a longer accelerated lifetime, more deposition of Co as a product, and greater efficiency.
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高影响因子
ELECTROANALYSIS
·
2010
·Vol. 22
·期 10
·1136-1142
·
IF 2.63
Huanshun Yin,Yunlei Zhou,Shiyun Ai,Lin Cui,Lusheng Zhu
A glassy carbon electrode (GCE) modified with Mg-Al-SDS hydrotalcite-like clay (SDS-HTLC) was used for the sensitive voltammetric determination of 2-nitrophenol (2-NP) utilizing the oxidation process. The results indicate the prepared modified electrode has an excellent electrocatalytic activity toward 2-NP oxidation, lowering the oxidation overpotential and increasing the oxidation current. Under optimal conditions, the oxidation current was proportional to 2-NP concentration in the range from 1.0×10 −6 to 6.0×10 −4 M with the detection limit of 5.0×10 −7 M by DPV ( S / N =3). The fabricated electrode was applied for 2-NP determination in water samples and the recovery for these samples was from 95.6 to 103.5%.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Zhi-Rong Li,Jing Liu,Jing-Yi Sun,Zhi-Yi Hu,Wan-Ying Li,Ting-Ting Shen,Mei-Tong Wei,Zhi-Wen Yin,Si-Ming Wu,Gustaaf Van Tendeloo,Yu Li,Bao-Lian Su
The Ni/Al layered double oxide (Ni/Al-LDO) is a promising photocatalyst because of the high surface area and abundant active sites. However, the application of Ni/Al-LDO for photocatalytic hydrogen evolution is hindered by the unclarity of the optimized microstructure and limited light absorption. In this work we report the structural evolution from Ni/Al layered double hydroxides (Ni/Al-LDH) to Ni/Al-LDO, which is able to achieve a precise regulation of the layered structure with abundant acid sites for photocatalysis. Further, CdS quantum dots (QDs) are in-situ grown on the sheet-like Ni/Al-LDO to obtain a close contact 0D/2D CdS-Ni/Al-LDO heterojunction. CdS-Ni/Al-LDO exhibits a hydrogen evolution efficiency of 20.3 mmol/g/h and an apparent quantum yield (AQY) of 22.2 % at a wavelength of 450 nm. The superior performance is attributed to the synergistic effects of abundant Lewis and Brønsted acid sites of Ni/Al-LDO, the layered structure with a high specific surface area and the heterojunction between Ni/Al-LDO and the CdS QDs.
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产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
An Chen,Bo Wu,XiaoDong Li,Jinpeng Shen,Lu Tian,Yong Zhou,Chonghua Pei
Thermites are a class of significant energetic materials widely used in aerospace propulsion, explosion, pyrotechnics, thermal batteries, and power generation. Although nanothermites exhibit fast reaction rates and high energy density, micron-sized thermites remain of practical importance over nanothermites due to their low electrostatic discharge (ESD) sensitivity, lower cost, and smaller dead mass. Herein, we develop micron-sized core–shell gallium-based liquid metal-modified Al@Fe2O3 (GLM-Al@Fe2O3), which exhibits high energy density and low laser ignition energy. At an equivalence ratio of 1.3, the differential scanning calorimetry results show that the total heat release of GLM-Al@Fe2O3 reaches 2555 J·g–1, which is much higher than that of the control sample (1424 J·g–1) prepared by a similar process. The density of GLM-Al@Fe2O3 (φ = 1.3) was characterized by a gas pycnometer analyzer, and its volumetric energy density could reach 9.96 kJ·cm–3. Laser-ignited combustion performance of GLM-Al@Fe2O3 was markedly reinforced in terms of the decreased ignition energy. Additionally, the ESD ignition threshold of GLM-Al@Fe2O3 is higher than 1 J, which revealed that the as-prepared GLM-Al@Fe2O3 was insensitive to electrostatic discharge. The facile and efficient strategy in this work provides inspiration to enhance the energy output performance and maintain the ESD safety of micron-sized thermites, which could show great potential in various civilian and military applications.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 32
·18940-18949
·
IF 10.733
Xiaohao Liu,Linbin Tang,Zhi Li,Jianhua Zhang,Qunjie Xu,Haimei Liu,Yonggang Wang,Yongyao Xia,Yuliang Cao,Xinping Ai
The low energy density and the unsatisfactory cycling stability of cathode materials in sodium-ion battery systems have restricted their wider application. Here, a representative high voltage cathode of Na4Co3(PO4)2P2O7 (NCPP) was modified through Al doping. The as-prepared Na3.85Co2.85Al0.15(PO4)2P2O7 (Al0.15-NCPP) can deliver a discharge capacity of 99.5 mA h g−1 at 0.5C. A superior rate capability (80.3 mA h g−1 at 20C and 73.4 mA h g−1 at 50C) as well as excellent ultralong cycling stability (96.3% capacity retention after 900 cycles at 10C and 82.7% capacity retention after 8000 cycles at 30C) can be obtained. The excellent sodium storage properties are benefited from the advantages of Al doping. Al doping not only enhances ionic conductivity, but also improves the structural stability. Al0.15-NCPP, which has outstanding electrochemical properties, has been proposed as a very attractive high voltage cathode material for sodium-ion batteries. More impressively, a full cell assembled with an Al0.15-NCPP cathode and hard carbon (HC) anode exhibits distinguished rate/cycling performances (70.6 mA h g−1 at 30C and 95% capacity retention after 200 cycles at 1C) and an extremely high output voltage of 4.36 V, thus providing a preview of its practical application. In addition, our research can be used to enhance the electrochemical properties of other polyanion-based high voltage electrode materials.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Chao Yu,Zhanfang Cao,Shuang Chen,Shuai Wang,Hong Zhong,Xin Ma
For many advanced energy technologies, it is essential to produce non-precious metals, high activity, and low charge transfer resistance electrocatalysts through low cost and simple methods. In this work, MoSe 2 -CoSe 2 @CoAl-LDH composite was synthesized by a one-step hydrothermal method. Compare with the CoAl-LDH catalyst, the prepared MoSe 2 -CoSe 2 @CoAl-LDH composite exhibits an excellent OER performance with a low overpotential (320 mV at 10 mA·cm −2 ), a small Tafel slope (71 mV·dec −1 ). The prominent OER performance of the MoSe 2 -CoSe 2 @CoAl-LDH composite can be mainly attributed to the fast electron transfer from the CoAl-LDH to MoSe 2 -CoSe 2 and the catalytic activity promoted by the energy change of Co 2+ due to the introduction of Se, which can be confirmed by EIS and XPS results, respectively. The strategy of this work may provide a low-cost and facile way for large-scale synthesis of non-precious metal modified hydrotalcite composite.
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高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 5
·955
·
IF 4.324
Xiaogang Guo,Qi Sun,Taotao Liang,A. S. Giwa
Film-forming techniques and the control of heat release in micro-energetic chips or devices create challenges and bottlenecks for the utilization of energy. In this study, promising nano-Al/MoO3metastable intermolecular composite (MIC) chips with an uniform distribution of particles were firstly designed via a convenient and high-efficiency electrophoretic deposition (EPD) technique at room temperature and under ambient pressure conditions. The mixture of isopropanol, polyethyleneimine, and benzoic acid proved to be an optimized dispersing agent for EPD. The kinetics of EPD for oxidants (Al) and reductants (MoO3) were systematically investigated, which contributed to adjusting the equivalence ratio of targeted energetic chips after changing the EPD dynamic behaviors of Al and MoO3in suspension. In addition, the obtained nano-Al/MoO3MIC energetic chips showed excellent heat-release performance with a high heat release of ca. 3340 J/g, and were successfully ignited with a dazzling flame recorded by a high-speed camera. Moreover, the fabrication method here is fully compatible with a micro-electromechanical system (MEMS), which suggests promising potential in designing and developing other MIC energetic chips or devices for micro-ignition/propulsion applications.Keywords:nano-Al/MoO3MIC;stable suspension;electrophoretic deposition;kinetics;micro initiator
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PubMed
高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 70
·期 1
·123-134
·
IF 2.574
Xiaomu Wen,Keke Chen,Chao Sang,Shen Yuan,Yunjun Luo
Composite solid propellants demand fine and stable mechanical properties, creep resistance and stress relaxation performance during their long storage and usage time. In this study, modified hyperbranched polyester (MHBPE) was prepared and introduced into HTPE/AP/Al/RDX (HTPE, hydroxyl-terminated polyether; AP, ammonium perchlorate; RDX, cyclotrimethylenetrinitramine) solid propellant as an effective additive. The static tensile and dynamic mechanical properties of this propellant before and after the introduction of MHBPE were evaluated. The elevated interfacial interaction by using MHBPE between the binder and RDX fillers improved the toughness and elasticity of the propellant. The enhancement mechanisms were also confirmed by the influence on the fracture surface morphology of the binder which was investigated by SEM. In addition, some influence on the dynamic mechanical properties of HTPE/AP/Al/RDX propellant caused by MHBPE was investigated by dynamic mechanical analysis. The creep behaviors of the HTPE/AP/Al/RDX propellants with and without MHBPE were also investigated at different stresses and temperatures. Reduced creep strain rate and strain were obtained for the modified propellant, implying enhanced creep resistance performance. The creep properties were quantitatively evaluated using a six-element model and the long-term creep performance of the propellant was predicted using the time–temperature superposition principle. A creep behavior of nearly 10 6 s at 30 °C could be acquired in a short-term experiment (800 s) at 30–70 °C. Moreover, the stress relaxation investigation of the propellants with and without MHBPE at −40 °C, 20 °C and 70 °C suggested that MHBPE/HTPE/AP/Al/RDX propellant possessed better response ability to deformation. Thus, the application of MHBPE provides an efficient route of reinforcement to enhance the creep resistance and stress relaxation properties. © 2020 Society of Chemical Industry
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