JOURNAL OF THE ENERGY INSTITUTE
·
2021
·
IF 6.186
Wenbin Li,Jida Wang,Zhen Wang,Jie Chen,Xiaoan Nie,Zhangshuai Ding,Dechao Wang,Zhifeng Zheng,Yunwu Zheng,Jianchun Jiang
Pt–Sn–Ce/γ-Al 2 O 3 catalysts were synthesized by the impregnation method and used to produce aromatic hydrocarbons (AHs)-rich bio-oil via catalytic fast pyrolysis of cellulose . The upgraded products were on-line analyzed by pyrolysis-comprehensive two-dimensional gas chromatography/mass spectrometry (Py-GC × GC/MS). It was found that Pt–Sn–Ce/γ-Al 2 O 3 catalysts were effective for improving the relative content of AHs in bio-oil. Especially, Pt–Sn–Ce/γ-Al 2 O 3 contributed the highest AHs content (85.82%), which was 3 times than that of γ-Al 2 O 3 , and increased 85.44% compared with non-catalytic. In addition, Pt–Sn–Ce/γ-Al 2 O 3 and Pt–Sn/γ-Al 2 O 3 can generate the highest monocyclic aromatic hydrocarbons (MAHs) with the relative content of 60.24% and 51.92%, respectively. Pt–Sn–Ce/γ-Al 2 O 3 catalyst can be reused five times with stable catalytic activity to produce AHs-rich bio-oil.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Shiyong Chu,Xiaojuan Jia,Jie Wang,Kaiming Liao,Wei Zhou,Yong Wang,Zongping Shao
Considering the abundance and low price of sodium , sodium-ion batteries (SIBs) are of particular attractiveness for large-scale electrochemical energy storage . Layered P2–Na 2/3 Mn 1/2 Fe 1/4 Co 1/4 O 2 (NMFC) is a promising cathode material for SIBs because of its large theoretical capacity, however, its high air sensitivity and poor cycling stability seriously limits the practical use. Here, we report nanometre-thick Al 2 O 3 coating of NMFC electrode through atomic layer deposition (ALD) technique can effectively alleviate such deficiencies to obtain an air-insensitive electrode, which was realized by effectively preventing the direct exposure of NMFC to H 2 O and CO 2 present in the air atmosphere. Interestingly, the ultrathin Al 2 O 3 coating did not cause a block for sodium ion intercalation, and a high capacity of 217.9 mA h g −1 at a high cut-off potential of 4.5 V was achieved. More attractively, a capacity retention rate as high as 84.8% was obtained after cycling at a current density of 0.5C over 100 cycles, demonstrating improved electrochemical stability. Based on CV and EIS characterizations, such good cycling stability is associated with the use of the Al 2 O 3 coating layer as well, which effectively avoided the side reactions at the interface of the liquid electrolyte and the active material under high potential.
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高影响因子
MATERIALS LETTERS
·
2019
·
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
Nanoscale
·
2019
·Vol. 11
·期 36
·16781-16787
·
IF 6.97
Na Li,Zheng Yi,Ning Lin,Yitai Qian
The application of Si-based anode materials is hindered by their extreme volume change, poor cycling stability, and low coulombic efficiency. Solving these problems generally requires a combination of strategies, such as nanostructure designing or surface coating. However, these strategies increase the difficulty of the fabrication process. Herein, a simple and one-pot replacement reaction route was designed to produce an Al2O3 layer anchored on mesoporous Si nanospheres (Si@Al2O3) by employing Al nanospheres with a naturally formed Al2O3 layer as a reducing agent and self-sacrificial template. The obtained Si@Al2O3 was mesoporous, with enough porous space to buffer the volume change and provide a fast lithium ion transfer channel. Furthermore, the coated Al2O3 layer could stabilize the structure and SEI layer of the mesoporous Si nanospheres, endowing the Si@Al2O3 nanospheres with improved initial coulombic efficiency, cycling performance and rate capability. As a result, a high capacity of 1750.2 mA h g−1 at 0.5 A g−1 after 120 cycles and 1001.7 mA h g−1 at 2 A g−1 after 500 cycles were delivered for lithium ion batteries. The good performance could be attributed to the mesoporous structure and the outer-coated Al2O3 layer.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Dawei Zhang,Gang Wang,Shudi Zhi,Kaile Xu,Lijing Zhu,Wenwei Li,Zhixiang Zeng,Qunji Xue
To improve the separation efficiency and decrease fouling of the membranes used in oil-in-water emulsions separation, a superhydrophilic and underwater superoleophobic TiO 2 /Al 2 O 3 composite membrane with ultra low oil adhesion was designed. TiO 2 nanorod arrays were prepared on Al 2 O 3 porous ceramic membrane surface by simple magnetron sputtering and hydrothermal oxidation. The microstructure and surface photosensitivity of TiO 2 nanorod array-coated ceramic membrane can effectively increase the efficiency of oil-water separation and reduce the degree of surface fouling. The layer of TiO 2 nanorod arrays not only reduced the pore size of traditional ceramic membrane (enhanced sieving effect of porous structures) but also endowed its superhydrophilicity (enhanced flux) and underwater superoleophobicity (enhanced oil/water selectivity and antifouling). Based on the superhydrophilicity (water contact angle (WCA) of 0°) and underwater superoleophobicity (oil contact angle (OCA) higher than 150°) of ceramic membrane, oil droplets were blocked by the membrane (oil-water separation efficiency 99.1% under gravity) and water will pass (flux is maintained at 41.8 L/(m 2 h) under gravity). It also has excellent anti-fouling ability due to the ultra-low oil adhesion force (0.084 mN) of the TiO 2 nanorod array-coating after UV irradiation. These features, combined with energy-saving, low-cost and easy-to-scale manufacturing schemes will be of great versatility and practicality in environmental rehabilitation and wastewater purification.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 127
·104884-104890
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IF 3.84
Yuan Cai,Huihui Huang,Lei Wang,Xiaojun Zhang,Yuewei Yuan,Rui Li,Hui Wan,Guofeng Guan
Mesoporous γ-AlOOH and γ-Al2O3 with fibrous morphology were successfully synthesized by an ionic liquid ([OMim]Br) assisted low temperature precipitation method using aluminum nitrate and ammonia as aluminum source and precipitant, respectively. The samples were characterized by XRD, TG, FT-IR, TEM, and N2 adsorption–desorption technique. The results showed that the concentration of [OMim]Br had a significant effect on the phase, porous structure, and morphology of γ-Al2O3 due to the strong interactions between [OMim]Br and γ-AlOOH. High purity γ-AlOOH was synthesized at 0.2 M [OMim]Br and γ-Al2O3 with a specific surface area of 243.53 m2 g−1, pore volume of 0.68 cm3 g−1, and average pore size of 11.10 nm was obtained after calcination. Furthermore, the recyclability of [OMim]Br was investigated. The recovery rate of [OMim]Br could reach 95.0 wt%, and the recycled [OMim]Br still had effects on the synthesis of γ-AlOOH and γ-Al2O3.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 107
·105338-105346
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IF 3.289
Deyuan Xie,Ye Sun,Tianle Zhu,Xing Fan,Xiaowei Hong,Wenhao Yang
NH3 synthesis from H2O + N2, H2 + N2 or H2O + H2 + N2 by dielectric barrier discharge combined with an Ru/Al2O3 catalyst is studied at atmospheric pressure and room temperature. Additionally, the effects of reaction gas composition, energy density, and discharge frequency on NH3 yield and by-product formation are investigated. The results show that NH3 can be formed from reaction gases consisting of H2O and N2. The NH3 yield of the reaction gas containing H2 is much higher than that of the reaction gas consisting of H2O and N2. The presence of H2O has a promotion effect on NH3 synthesis from H2 and N2, especially for reaction gases with an H2 content less than 10%. The NH3 yield first increases and then decreases with an increase in the energy density. The maximum yield of 680 mg kW−1 h−1 occurs at the energy density of 1400 J L−1 and in the reaction gas of 0.14% H2O, 40% H2 and N2. The discharge frequency has a great effect on the NH3 yield, and maximum NH3 yield is obtained at the frequency of 13 kHz. Besides NH3, some by-products, such as N2O and NO2, are also formed with reaction gases containing H2O. However, their formation can be suppressed in the presence of H2, which is attributed to the reduction effect of H2 on the by-products.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Lei Li,Guolan Wei,Hengji Liu,Yongde Guo,Yingying Ma
Traditional nanofiber-hybrid proton exchange membranes (PEMs) are limited in their further application due to differences in proton conductivity between vertical and horizontal orientations. In this study, we design and synthesize a novel type aminated flower-shaped ZnO@Al 2 O 3 nanofibers and then filling its three-dimensional interstices with sulfonated polysulfone (SPSF) to obtain a nanofiber composite proton exchange membrane (ZANFs/SPSF). The Al 2 O 3 nanofibers provide long-range and stable proton transport nanochannels in plane, while the flower-shaped ZnO on its surface provide additional vertical transport channels for protons. This combination of 1D and 2D conductive pathways forms a typical 3D hierarchical proton conductive configuration, optimizing the proton transfer pathway. Specifically, the amino groups (-N-H) on the nanofibers surface not only form acid-base pairs with sulfonic acid groups (-SO 3 H), providing a rich hydrogen bonding network for proton hopping, but also have a similar structure to the polyether sulfone groups (–SO 2 –NH-), which significantly improves the compatibility between the nanofibers and SPSF. Additionally, the flower-like pleated surface of the nanofibers has a high contact area with the SPSF, providing more proton hopping sites, improving the utilization efficiency of proton carriers, and also resulting in a more stable structure. Moreover, the crosslinked network of nanofibers serves as a barrier to further inhibit methanol permeation. The ZANFs/SPSF exhibits excellent parallel proton conductivity of 348 mS cm −1 at 80 °C and 100% RH, which is 2.7 times higher than that of SPSF under the same conditions, and achieves a peak power density of 405.7 mW cm −2 . This approach presents a unique perspective for the preparation of high-performance PEMs for methanol fuel cells.
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高影响因子
OPTICAL MATERIALS
·
2024
·
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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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Wenjie Zhu,Yuwei Ren,Minghang Li,Yichun Bi,Ce Zheng,Xiaoqiang Li
Ti 3 SiC 2 MAX phase with a purity of up to 98 vol%, comparable to the purity of commercial Ti 3 SiC 2 prepared by Hot Pressing (HP), was synthesized by Reactive Melt Infiltration (RMI) in this work, overcoming the inherent shortcoming of RMI products' poor purity. Compared with HP Ti 3 SiC 2 , the lower preparation temperature and pressure-free fabrication of high-purity RMI Ti 3 SiC 2 make it promising for applications in the Ceramic Matrix Composites (CMCs), especially for complex shaped CMCs parts. This work systematically studied the generation mechanism of Ti 3 SiC 2 with the help of κ-Al 2 O 3 during the RMI process, which enables the successful production of high-purity Ti 3 SiC 2 . The toughening mechanism of Ti 3 SiC 2 in Ti 3 SiC 2 composites was also characterized and analyzed. This work attempts to provide a new idea for introducing high-purity ceramic phase into CMCs by RMI process.
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高影响因子
Sustainability
·
2024
·Vol. 16
·期 2
·890
·
IF 3.3
Miao Tian,Qiongqiong Wang,Songsong Wang,Xingbang Wan,Qinmeng Wang,Xueyi Guo
Waste electrical and electronic equipment (WEEE) contains various valuable metals, making it a potential secondary resource for sustainable metal usage. Pyrometallurgical smelting is an efficient technique to recycle WEEE by extracting precious metals into copper matte and removing impurities into slags. The impact of WEEE impurities such as CaO and Al2O3on the phase compositions of the smelting products attracts great attention for industrial metal recovery. This study clarified the impact of CaO and Al2O3on the equilibrium phase compositions of copper matte and SiO2-saturated FeOx-SiO2-Al2O3-CaO slags. The high-temperature smelting experiments were taken at a controlled p(SO2) of 0.1 atm and 1300 °C, followed by quenching and electron probe microanalysis. The results showed that the copper and sulfur in the smelting system were highly deported into copper matte, and their distribution in matte was enhanced by increasing CaO and Al2O3concentrations introduced by WEEE. The chemical copper dissolution in slags increased with increasing matte grade but decreased by adding CaO and Al2O3. The iron was preferentially concentrated in slags, and higher matte grades improved the iron distribution in slags. The current experimental results enrich fundamental thermodynamic data and help optimize WEEE smelting operations for efficient recovery of valuable metals.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Tingting Huang,Qingyi Peng,Wenjin Shi,Jundong Xu,Yu Fan
This article proposes a novel sodium dodecylbenzenesulfonate (SDBS)-assisted equilibrium adsorption method for preparing highly dispersed Ni/Al 2 O 3 and Fe-promoted NiFe/Al 2 O 3 thioetherification catalysts. The proposed strategy anchors nickel cations onto the electronegative surface of an Al 2 O 3 support modified by negatively charged DBS − bilayers. As a result, this method achieves highly dispersed Ni nanoparticles without strengthening the metal-support interaction, promoting the reducibility and sulfurization of the supported Ni species. The as-prepared Ni-based catalysts have a smaller size, a higher dispersion of metal nanoparticles, and a greater amount of active metal sulfides than their counterparts prepared by the conventional impregnation method, endowing them with excellent catalytic performance for the highly selective removal of mercaptans. This method provides a new opportunity to prepare highly dispersed metal nanoparticles without a strong metal-support interaction.
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高影响因子
危险品化学品经营许可证（带存储）