Small
·
2023
·Vol. 19
·期 48
·2303924
·
IF 13.3
Taotao Zhou,Wenhao Tang,Junwen Lv,Yirui Deng,Qiang Liu,Lei Zhang,Ruiping Liu
Commercial polymer separators usually have limited porosity, poor electrolyte wettability, and poor thermal and mechanical stability, which can deteriorate the performance of battery, especially at high current densities. In this work, a functional polyethylene (PE) separator is prepared by surface engineering a layer of Ti-doped SiO 2 @Al 2 O 3 particles (denoted as ST@Al 2 O 3 -PE) with strong Lewis acid property and uniform porous structure on one side of the PE separator. On the other hand, ST@Al 2 O 3 particles with abundant pore structures and large cavities can store a large amount of electrolyte, providing a shortened pathway for lithium-ion transport, and the Lewis acid sites and porous structure of the ST@Al 2 O 3 can tune Li plating/stripping behavior and stabilize the lithium metal anode. The ST@Al 2 O 3 -PE separators exhibit better ionic conductivity (5.55 mS cm −1 ) and larger lithium-ion transference number (0.62). At a current density of 1 mA cm −2 , Li/Li symmetric cells with ST@Al 2 O 3 -PE separator can be stably cycled for more than 400 h, and both lithium iron phosphate /Li cells and lithium cobaltate/Li cells with ST@Al 2 O 3 -PE separator have good cycling and rate performance. This work provides a new strategy for developing functional separators and promoting the application of lithium metal batteries.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 2
·488-496
·
IF 8.067
Min-Hang Huang,Qiang-Qiang Zhu,Shuxing Li,Yue Zhai,Hong Zhang,Le Wang,Rong-Jun Xie
The key to developing laser-driven solid-state lighting lies in high-performance color converters, which must be thermally robust under the high-power density excitation of a laser. Phosphor-in-glass (PiG) films are considered as a kind of promising color converter for laser lighting, but the poor thermal dissipation of the glass matrix will cause large thermal quenching of the PiG films and hence low luminous flux of lighting sources. In this work, Al2O3 particles, acting as a heat transfer medium, are introduced into the La3Si6N11:Ce3+ (LSN:Ce3+) PiG film to form a composite color converter for realizing high-brightness laser lighting. By optimizing the ratio of glass frits to Al2O3 as well as the film thickness, the Al2O3–LSN:Ce3+ composite PiG film shows a luminance saturation threshold of 23.08 W mm−2, which is 26.3% higher than that of the Al2O3-free LSN:Ce3+ PiG film (18.27 W mm−2). The luminous flux of the composite PiG film under blue laser excitation is improved by 51.4% and reaches 3120 lm, and the luminous flux of the laser-driven white light can reach up to 2886 lm. It indicates that the Al2O3–LSN:Ce3+ composite PiG film would be an interesting color converter for producing high-brightness laser-driven white light.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Bingying Gao,Xuzhang Sun,Chao Yao,Linqiang Mao
High–temperature resistant aerogel coating usually prevents damage to walls and equipment in a harsh high–temperature environment, but these coating still has some disadvantages in practical application, such as short time of high–temperature resistance or low stability. In this work, ZrO 2 –Al 2 O 3 composite aerogel coating with prominent high–temperature resistance and rapid heat dissipation was successfully fabricated by employing (Al(H 2 PO 4 ) 3 , AHP) as high–temperature adhesive to form stable phosphates products. The thermal conductivity and thermal diffusivity of the obtained ZrO 2 –Al 2 O 3 composite aerogel coating are 0.1602–0.1623 W/mK and 0.3488–0.4702 mm 2 /s, respectively. The resultant aerogel coating with a thickness of 1.4 cm showed good performance in heat resistance with tolerance of flame up to ∼1300 o C for 15 min, and rapid heat dissipation that can be cooled to 32.7–38.4 o C within 60–70 s. Phosphate products, such as AlPO 4 and ZrP 2 O 7 , are mainly formed at high temperature with the introduction of AHP, which fundamentally improves the high–temperature resistance and flame retardant of aerogel coating. Different microstructure and pore structure are responsible for the heat dissipation performance of the aerogel coating, which shows high thermal diffusivity of 0.3488–0.4702 mm 2 /s. Overall, this work provides a new strategy for preparing aerogel coating with high–temperature resistance, flame retardant, thermal stability and rapid heat dissipation suitable for harsh conditions.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 26
·20518-20531
·
IF 2.779
Luo Huan,Li Hao,Yuan Shengxu,Li Jinchao,Zhang Yaping,Duan Hao,Li Jing
In this work, the Li-rich manganese layered oxide Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNC in short) is coated with a novel Al 2 O 3 –ZrO 2 layer for lithium-ion battery application. Three modified LMNC materials including AZ1, AZ2 and AZ3 with different mass ratios between Al 2 O 3 –ZrO 2 coating and LMNC are successfully prepared. Al 2 O 3 –ZrO 2 coating layer inhibits the side reactions, restricts the transformation of layered structure and enhances the stability of LMNC. The coated LMNC shows the most excellent electrochemical performance for application in lithium-ion battery, when the mass ratio between Al 2 O 3 –ZrO 2 coating layer and LMNC is 2 wt% (AZ2). The specific discharge capacity of AZ2 (111.0 mAh g −1 ) is significantly higher than that of pristine LMNC (i.e., AZ0) (85.6 mAh g −1 ) at the 10 C rate. Moreover, the AZ2 shows outstanding durability during the 200 times cycling charge and discharge tests at 1 C, whose capacity retention rate and voltage decay are 81.6% and 370.1 mV after 200 cycles, respectively. Specifically, the voltage decay rate of AZ2 is much lower than those of most reported Li-rich manganese layered oxides. Therefore, the as-prepared AZ2 cathode material with excellent electrochemical performance has a bright future for lithium-ion battery application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jin Liu,Hongyu Chen,Chaosheng Zhu,Songfang Han,Jun Li,Sijia She,Xiaoyong Wu
Advanced oxidation processes (AOPs) based on photo-Fenton reaction has been widely used in refractory organic wastewater treatment . However, the mineralization rate and H 2 O 2 utilization in AOPs is relatively low. Herein, a photothermal-assisted photocatalytic-Fenton-like process with CuO x /γ-Al 2 O 3 catalyst was designed to solve the above issues. The utilization rate of H 2 O 2 and mineralization rate of tetracycline hydrochloride (TC) in the 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 /full spectrum light system were significantly increased to 72.0% and 74.3%, respectively, which were ascribed to the synergy of photothermal effect and photocatalytic-Fenton-like reaction. During the simultaneous removal of TC and Cr(VI), the reaction efficiency of 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 /light system was much higher than that of 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 system. In addition, the 3%-CuO x /γ-Al 2 O 3 /H 2 O 2 /light system was not only active in wider pH range (3–9), but also effective in various organic pollutants and Cr(VI) coexisted solutions as well as different water conditions. More importantly, a possible photothermal-assisted photocatalytic-Fenton-like reaction mechanism for the simultaneous removal of TC and Cr(VI) in the CuO x /γ-Al 2 O 3 /H 2 O 2 /light system was proposed. This work may pave a new way for efficient simultaneous removal of refractory organic pollutants and heavy metals in wastewater.
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高影响因子
FUEL
·
2022
·
IF 8.035
Qiangqiang Xue,Huilin Yi,Zhengwen Li,Zhao Jiang,Meng Chen,Yujun Wang,Binhang Yan,Guangsheng Luo
Surface modification of 600-µm-sized monodisperse gamma-alumina microspheres into magnesium–aluminum spinel, and co-impregnation-based loading of Rh–Ni (0.46 wt% Rh, 9.03 wt% Ni) were performed to synthesize catalysts for diesel-steam-reforming to hydrogen. The intimate interactions between Rh and Ni, the formation of the Rh–Ni alloy, and the Rh-doping-induced decrease in the particle size of Ni were determined. The DFT calculations results revealed that Rh-doped Ni(1 1 1) established remarkably weak bonds with oxygen-containing intermediates, and the reaction barrier of the rate-limiting step (CH 2 * + O* → CH 2 O*) on Rh–Ni(1 1 1) (0.76 eV) was lower than those of Ni(1 1 1) (1.14 eV) and Rh(1 1 1) (1.56 eV). The bimetallic catalyst shows the enhanced activity and resistance of sintering and carbon deposition compared with those of Ni-based (9.33 wt% Ni) and Rh-based (0.47 wt% Rh) catalysts. The catalytic performance of Rh–Ni-based catalyst was superior to that of physically mixed Ni-based and Rh-based catalysts at similar active metal loadings, which further confirmed the synergistic effect of Rh–Ni.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Guolong Sang,Chao Wang,Yi Zhao,Ge He,Qifan Zhang,Minghao Yang,Shihui Zhao,Pei Xu,Xiaoqing Xi,Jinlong Yang
Ingenious microstructure design and appropriate multicomponent strategies are still challenging for advanced electromagnetic interference (EMI) shielding materials with excellent shielding effectiveness (SE) and reliable mechanical properties in harsh environments and low filling levels. In this study, nickel@multiwalled carbon nanotubes/alumina (Ni@CNTs/Al2O3) ceramic composites with segregated structures and electric/magnetic-coupling networks anchored by CNTs and magnetic Ni nanofillers were prepared by hot-press sintering. CNTs/Al2O3 ceramic composites exhibit a percolation threshold of only about 0.32013 vol %, which is lower than those of other reported CNTs/Al2O3 composites with segregated or uniformly dispersed structures. The electrical conductivity and EMI SE of 9CNTs/Al2O3 ceramic composites with 9 vol % (4.76 wt %) CNT content were 103.1 S/m and 33.6 dB, respectively. In addition, EMI SE and toughness were both enhanced by the synergistic effect of Ni nanoparticles and CNTs. In the unit of a segregated structure, a three-dimensional (3D) electric/magnetic-coupling network effectively captures and attenuates electromagnetic wave energy by electrical conduction, dielectric loss, and magnetic loss. On the other hand, the pull-out of CNTs and deflection of cracks distributed along the segregated structures synergistically enhance the fracture toughness of Ni@CNTs/Al2O3 ceramic composites. High-performance 3Ni@5CNTs/Al2O3 ceramic composites with 5 vol % (2.64 wt %) and 3 vol % (0.76 wt %) CNT contents have been achieved, whose EMI SE is 41.8 dB, density is 90.99%, flexural strength is 197.83 ± 18.62 MPa, and fracture toughness is 6.03 ± 0.23 MPa·m1/2. This efficient method provides a promising way to fabricate EMI shielding ceramic composites with high mechanical properties.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Lina Zhou,Xingwang Zhang,Lecheng Lei
The δ-FeOOH/γ-Al 2 O 3 composite were prepared under mild conditions by the activated alumina absorption of Fe 2+ followed by rapid oxidation by H 2 O 2 . The δ-FeOOH growing on γ-Al 2 O 3 was composed of nanoneedles , forming a 3D flower-like morphology with a diameter of ~10 nm to provide a large number of active sites. The effects of Fenton reaction conditions, such as catalyst dosage, H 2 O 2 concentration, phenol concentration, initial pH value and temperature, on the catalytic activity of δ-FeOOH/γ-Al 2 O 3 were investigated. Under the optimal conditions, about 97.4% of phenol and 81.6% of total organic carbon (TOC) were removed in 5 min and 2 h, respectively. In addition, with γ-Al 2 O 3 as macroscopic size carrier (the diameter of 1–2 mm), the catalyst could be easily reused 10 runs with no significant reduction in catalytic activity. The possible mechanism was discussed, and it revealed that OH· was the main active species for degradation of phenol into intermediates and further into CO 2 and H 2 O. The δ-FeOOH/γ-Al 2 O 3 also showed high catalytic activity and reusability in the treatment of real industrial wastewater , making it a promising catalyst for industrial application.
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CATALYSIS LETTERS
·
2018
·Vol. 148
·期 7
·1893-1903
·
IF 2.911
Wang Ying,Shen Shuguang,Li Meina,Sun Yujuan,Li Binbin
Abstract Magnesium aluminum layered double hydroxide (MgAl–LDH) was first successfully deposited in situ on η -Al 2 O 3 applied to catalyze urea hydrolysis. Characterization by AAS, XRD, SEM, EDS, DSC, FT-IR, N 2 -BET, determination of base strength and basicity and experiments on hydrolysis activities of in situ MgAl–LDH catalysts show that the crystallinity and coverage degree of MgAl–LDH on η -Al 2 O 3 gradually increase with increasing initial c (Mg 2+ ). When initial c (Mg 2+ ) = 2 mol L −1 , η -Al 2 O 3 is completely covered and the smallest particle size, the highest crystallinity, basicity and urea degradation rate of in situ MgAl–LDH are obtained. The basicity is mainly from Mg–OH at the edges of MgAl–LDH on η -Al 2 O 3 . The highest basicity corresponds to the highest urea degradation rate, Mg–OH is the active sites for catalytic hydrolysis of urea. The specific surface area, basicity and catalytic activity of MgAl–LDH by in situ synthesis are evidently higher than MgO and MgAl–LDH purchased. The urea concentration is 8.162 mg L −1 at 165 °C after 120 min with in situ MgAl–LDH ( c (Mg 2+ ) = 2 mol L −1 ) as catalyst, which is below the effluent standard. In situ MgAl–LDH also shows excellent recycling ability and the slight loss of activity should be due to the reduction of basicity, which is caused by hydrothermal conditions. In addition, a possible catalytic mechanism of urea hydrolysis over MgAl–LDH is proposed. Graphical Abstract
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Shan Huang,Zhichun Si,Duan Weng
Highly stable Ag:AgBr/γ-Al 2 O 3 photo-catalyst was obtained by dispersing AgBr sol on hollow γ-Al 2 O 3 microsphere. Metallic Ag nanoparticles were in situ generated on AgBr crystals by a photo-reduction method. The activity of catalyst was characterized by MO and phenol decomposition. The light irradiation response, the life times of the photo-induced charges, and the charge separation and transition were determined by the UV–vis diffuse reflection spectra, open circuit voltage decay spectra and transient photocurrent responses. The as-prepared Ag:AgBr/γ-Al 2 O 3 catalyst can response to visible light irradiation. Charge separation was clarified to correlate with electrons transferring from Ag to AgBr surface and the consequent reaction with ads-O 2 to generate O 2 − species. It was found that the O 2 − rather than OH played a dominant role in the photocatalytic oxidation of MO and phenol in water. However, the electrons trended to transfer from AgBr to Ag intrinsically without light irradiation. Therefore, the electron transfer between Ag and AgBr reaching the dynamic equilibrium was the key factor for obtaining a high stable Ag/AgBr catalyst which can be obtained by optimizing the Ag:AgBr ratio. Loading amount of Ag:AgBr on γ-Al 2 O 3 was optimized to 30 wt.% and the metallic Ag content was stabilized at 9 wt.% of Ag:AgBr catalyst.
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FUEL
·
2023
·
IF 7.4
Zhusong Xu,Haoze Wang,Huanqi Kang,Luyuan Zhao,Xiaodong Liu,Wenbing Huang,Yasong Zhou,Qiang Wei
This article proposes a novel organic additive 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) for the preparation of NiW/Al 2 O 3 efficient hydrodesulfurization (HDS) catalysts. The effects of HEDP on the nature of the tungsten and nickel species supported on the support surface after drying and calcination steps were revealed by employing ultraviolet–visible spectroscopy (UV–Vis), Raman spectroscopy, N 2 adsorption–desorption and H 2 temperature programmed reduction (H 2 -TPR). While the slab morphology and the proportion of NiWS phases were determined by X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). Finally, dibenzothiophene (DBT) was used as a probe to evaluate the effects of HEDP modification on the catalytic performance of the prepared catalyst. The results indicate that the addition of HEDP can facilitate the formation of more polymerized tungsten oxide species and improve the availability of surface nickel atoms. The weakened interaction between active metals and support generate higher stacking numbers and shorter slab lengths among WS 2 crystals on the corresponding catalyst, promote the sulfidation of both Ni and W species and enhance the proportion of NiWS phase. The catalytic evaluation results show that the HEDP-modified catalyst exhibits efficient HDS activity and higher DDS selectivity compared to the phosphoric acid-modified reference catalyst, which is attributed to a large number of accessible NiWS active sites. The present work relates the addition of organic additives with the formation of NiW species and the catalytic activity. The results highlight that the addition of HEDP is an effective strategy to improve the performance of HDS catalysts.
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ENERGY CONVERSION AND MANAGEMENT
·
2023
·
IF 10.4
Liangyong Chen,Daocheng Liu,Guoqiang Wei
Integrated Capture and Methanation of CO 2 (ICCM) with H 2 produced from renewable energy is a novel Power-to-Gas technology. The combination of ICCM with CO 2 point source, such as coal-fired power plant, is anticipated, which greatly motivates the investigations into the influences of coal ash on the key performance of dual function material (DFM) used in ICCM process. Via the experimental study on the coal ash impacts, this work explored the adaptability of DFM and ICCM to coal-fired power plant. Na-Ru/Al 2 O 3 DFM and two ashes collected from the electrical precipitators of supercritical coal-fired power plants were used for experiments. It showed that fly ashes contaminated CO 2 adsorbents and active sites of DFMs, and caused successive drops in carbonates conversion and CH 4 selectivity upon cyclic ICCM reactions. The CO 2 -TPD and H 2 -TPSR tests revealed that the declined supply capability of hydrogen atoms by Ru sites, and the increased rate gap between CO formation and the following CO hydrogenation were responsible for the declined methanation ability of ash-contaminated DFMs. The roles of SiO 2 and Fe 2 O 3 phases in ashes were identified, indicating that SiO 2 reacted with adsorbent components and masked Ru sites, and then induced DFM deactivation by affecting the transport processes of key reactants; Fe 2 O 3 successively invaded both Ru sites and Na 2 CO 3 /γ-Al 2 O 3 interface, leading to successive losses in methanation ability and CO 2 desorption capacity with cyclic ICCM reactions.
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