JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Gui Li,Jianjie Hao,Jiayan Li,Pengyu Dai,Bo Wang,Yuanqi Li,Yi Tan,Xueqiang Cao
This work firstly evaluated the effect of temperature on the preparation of SiC coating using Al 2 O 3 as catalyst by pack cementation (PC) method. SiC/ZrB 2 -SiC-Si (ZSS) and SiC/ZrB 2 -SiC-Al 2 O 3 (ZSA) coating were prepared on the surface of C/C composites by PC combined with atmospheric plasma spraying (APS). The objective of this work is to study the influence of Si and Al 2 O 3 additives for ablation performances of ZrB 2 -SiC coating. The coated samples were subjected to ablation test, and the phase composition and microstructure evolution were investigated. The results indicated that SiC/ZSA coating had better ablation resistance because phase transformation and growth of ZrO 2 grain was restrained by Al 2 O 3 .
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2017
·
IF 0
Liping Wang,Lei Zhang,Qingji Wang,Wenjun Li,Bo Wu,Weishang Jia,Yuehui Wang,Jingze Li,Hong Li
Lithium metal is a Holy Grail anode for high energy density lithium ion batteries . While, its high chemical reactivity and high tendency to form dendrites hinder its wide applications. Here, in this study, we stabilize lithium metal by engineering an artificial SEI layer, namely fabricating a conformal nano-meter thickness amorphous Al 2 O 3 thin film via magnetron sputtering technique on its surface. The obtained Al 2 O 3 modified Li metals present robust chemical surface stability and effectively restrain the dendrite growth. 20 nm-thick Al 2 O 3 film modified lithium metal in an all-solid-state battery Li/PEO-LiTFSI/Li ensures a cycle life of 660 h at a current density of 0.1 mA/cm 2 . Contradicting to a traditional belief of lithium plating at the current collector side via crossing the Al 2 O 3 film, it directly plates on the Al 2 O 3 film next to the separator side. Al 2 O 3 film plays a crucial role as a “surfactant” in inducing a layer-by-layer film growth mode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Shuyi Li,Changle Mu,Nianqiu He,Jie Xu,Yanping Zheng,Mingshu Chen
ABSTRACT The surface structures of heterogeneous catalysts significantly impact catalytic performance, especially for structure-sensitive reactions. In this study, we employed surface techniques such as low-energy ion scattering spectroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy with CO as a probe (CO-FTIR) to investigate the surface dynamics of Rh/Al 2 O 3 catalysts for propane dehydrogenation (PDH). We observed a notable induction process for PDH on Rh/Al 2 O 3 catalysts, marked by significant variations in propane conversion, methane, and propylene selectivities. These changes were attributed to substantial coke formation. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy) and CO-FTIR revealed the coexistence of Rh nanoparticles , clusters, and single atoms on the surface. Through various dynamic quasi in-situ characterizations, we found that coke preferentially covered Rh clusters, thereby inhibiting C–C bond breaking and methane formation. Meanwhile, Rh single atoms were less affected by coke coverage and remained exposed as active and selective sites for PDH, favoring propylene production. This work underscores the sensitivity of PDH to the sizes of Rh species, with isolated Rh single atoms promoting propylene formation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
TRIBOLOGY LETTERS
·
2016
·Vol. 65
·期 1
·1-9
·
IF 1.758
Liu Xiaoyan,Wu Yicheng,Yu Zhiqiang
The tribological behaviors of epoxy composites filled with organic functionalized ZrB 2 –Al 2 O 3 were environmentally investigated and compared with those with as-received fillers under both dry and oil sliding conditions in this work. The worn surfaces and the transfer films on the counterparts were characterized by scanning electronic microscope (SEM), and the frictional temperature rising was investigated by infrared thermometer. The results demonstrated that the coefficient of friction (CoF), the wear rate, as well as the frictional temperature rise of the epoxy composites were all decreased due to the introduction of ZrB 2 –Al 2 O 3 fillers. And with the increase in filler content, similar variation tendencies of CoF and wear rate of epoxy composites were observed under the different sliding conditions. Besides, the organic functionalization of ZrB 2 –Al 2 O 3 fillers, which made the epoxy composites exhibit lower CoF and wear rate than those with as-received fillers, lowered the frictional temperature as well. In comparison, the epoxy composites filled with 5 vol% modified fillers presented better tribological properties, suggesting a stronger interfacial bonding between modified fillers and epoxy matrix. The dominant wear mechanisms of filled composites under dry and oil sliding conditions could be inferred as the combination of adhesive wear and abrasive wear and the fatigue wear, respectively, on the basis of SEM images of worn surfaces.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Zhilin Zhang,Guangzhi He,Yaobin Li,Changbin Zhang,Jinzhu Ma,Hong He
Pt/Al2O3 catalysts showing excellent activity and stability have been used in various reactions, including HCHO oxidation. Herein, we prepared Pt–Na/Al2O3 catalysts with a Pt content of 0.05 wt % to reveal the key factors determining the anchoring of Pt as well as the catalytic activity and mechanism of HCHO oxidation. Pt–Na/nano-Al2O3 (denoted as Pt–Na/nAl2O3) catalysts with 0.05 wt % Pt content could completely oxidize HCHO to CO2 at room temperature, which is the lowest Pt content used in HCHO catalytic oxidation to our knowledge. After Na addition, terminal hydroxyl groups (denoted as HO-μter) on nano-Al2O3 were transformed to doubly bridging hydroxyl groups between Na and Al (denoted as HO-μbri(Na–Al)), which atomically dispersed Pt species. Pt anchoring further promoted the regeneration of HO-μbri(Na–Al) by activating O2 and H2O, oxidizing HCHO to CO2 directly by the fast reaction step ([HCOO–] + [OH]a → CO2 + H2O). Our study revealed that the HO-μbri(Na–Al) synergistically generated by HO-μter and Na species provided anchoring sites for Pt species.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2016
·
IF 7.354
Xuelin Zou,Zebao Rui,Shiqi Song,Hongbing Ji
Poor durability and low Pd utilization efficiency are the main drawbacks of supported Pd catalysts for low-temperature methane combustion. Here, we present a facile way to stabilize the performance of Pd/Al 2 O 3 by introducing a spinel NiAl 2 O 4 interface as a promoter at no cost to the activity. The NiAl 2 O 4 interface is formed by impregnation of alumina supports in the nickel-containing solution, followed by high-temperature calcination. A series of 0.4 wt.% Pd/ x NiO/γ-Al 2 O 3 with NiO loading varying among 0.0, 0.5, 1.0, and 9.0 wt.% is investigated. The formation of a NiAl 2 O 4 interface promotes the distribution and crystallization of PdO, suppresses PdO particles aggregation and surface OH − species accumulation during the reaction, and finally leads to the excellent performance of Pd/0.5NiO/γ-Al 2 O 3 . Pd/0.5NiO/γ-Al 2 O 3 demonstrates higher Pd utilization efficiency than the state-of-the-art Pd-based catalysts and better stability than Pd/Al 2 O 3 . Such a spinel interface promotion strategy may bring new insight into the design of highly efficient Pd-based catalysts and their potential technological applications.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Wei Xu,Jichao Wang,Pan Zhang,Nikom Klomkliang,Somboon Chaemchuen,Francis Verpoort
A facile growth of microporous ZIFs , such a s ZIF-67, ZIF-8 into mesoporous alumina to obtain hierarchical micro/mesoporous ZIFs@Al 2 O 3 is achieved. Several analysis techniques, such as powder-XRD, SEM, ICP, and gas adsorption , etc. are applied to characterize the composite materials. The use of a surfactant is the critical parameter to functionalize and assist the nano-crystal ZIFs growth in meso -Al 2 O 3 . To obtain a high crystal density ZIF-growth in meso-Al 2 O 3 different parameters are tuned such as the surfactant (type and concentration), precursor concentration of ZIFs, and synthesis cycle of the composite material. The synthesis strategy is applicable for any ZIFs to be hybridized on supporting media such as m eso -Al 2 O 3 . Furthermore, the application of ZIF-67@Al 2 O 3 as a catalyst is examined and shows a high performance and recyclability for applications such as the Knoevenagel condensation and CO 2 fixation reaction with epoxides. The highly active sites are distributed on a larger particle support (m eso -Al 2 O 3 ) is found to enhance the catalytic performance. Finally, the main advantage of the composite material is the straightforward handling compared to the use of bulk phases MOFs as a catalyst.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Matter
·
2025
·
IF 17.5
Chaoran Liu,Zai Wang,Xin Tong,Zhenhua Wu,Lin Zhou,Haiyang Zou,Ayodeji Ogunjuyibe,Hongjian Lin,Dongfang Yan,Weihuang Yang,Linxi Dong,Gaofeng Wang,Zhong Lin Wang
Harvesting sustainable electricity from natural water evaporation has been attracting attention as a promising alternative to supply power for low-power systems. However, low-current output and rigid materials largely hinder its extensive applications. Herein, we present a water-evaporation-induced high-direct-current electricity generator based on stretchable flexible hydrogel/Al 2 O 3 . This flexible electricity generator forms a porous Al 2 O 3 substrate by dissolving the NaCl from the heat-cured gelatin/Al 2 O 3 /NaCl. It achieves a sustainable and stable direct current of 32 μA, a low internal resistance of 5.18 kΩ, and a maximal output power of 1.76 μW with a maximum output power density of 0.55 mW m −2 by optimizing the electricity generator’s physical dimensions and concentration ratios. The developed water-evaporation-induced electricity generator shows many application prospects, including as a power supply for digital calculators and hygrothermographs and to drive a boat of 5.1 cm. This research provides an in-depth study on a stretchable high-direct-current water-evaporation-induced electricity generator and an efficient approach to power supplies for low-power systems.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Tianyi Huang,Jiajia Wu,Yongqi Pan,Zhiyuan Yu,Fangyu Zhao,Shafqat Ullah,Yang Xu,Yong Chen,Zhehao Sun,Zongyou Yin,Qiangqiang Xue,Sibudjing Kawi,Shuliang Lu,Yujun Wang,Guangsheng Luo
The hydrogenation of the C=C bond in α-β unsaturated aldehydes faces substantial difficulties due to the steric hindrance and the conjugation effects of macromolecular unsaturated aldehydes. Herein, we introduce a novel approach to prepare nanosheet-structured Ni-Al 2 O 3 catalysts featuring exposed {100} crystal planes and hydroxyl groups, utilizing a microfluidic system to easily control crystal plane growth achieve support modification. In-situ characterizations and DFT calculations reveal that the exposed {100} crystal plane, a strong metal-support interaction (SMSI) promotes electron transfer of Ni and significantly reducing the C=C hydrogenation energy barrier from 3.12 eV to 1.79 eV. The hydroxyl environment facilitates effective adsorption of the C=O bond, accelerating the reaction and enabling rapid desorption of the product. Under modified reaction conditions for the preparation of 2-ethylhexanol, the catalyst still achieved a yield of 99.9%. This simple method of support modification enables rapid large-scale preparation, possessing significant potential for industrial applications.
研究领域:
催化化学
·
材料科学
·
理论计算化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Tianyu Zhang,Yang Hong,Jingyang Li,Yang Li,Huiyang Zhao,Kai Cui,Wenjing Wei,Hongjun Kang,Jinzhu Wu,Wei Qin,Xiaohong Wu
The radiation resistance of Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) is of great significance when applied in aerospace. However, it is still challenging to obtain MOSFETs with excellent radiation resistance. In this work, the radiation hardened MOSFETs were realized by GdF 3 -Al 2 O 3 @Bi-Ti 3 C 2 T x /epoxy (MBAG/EP) polymer-based composite coating with function of trapped interfacial electrons. The radiation resistance of resultant packed MOSFET is significantly improved, showing the lower threshold voltage negative drift value (0.41 V) than the bare MOSFET (7.89 V). This is mainly attributed to the introduction of ultra-thin Al 2 O 3 intermediate layer between Bi and GdF 3 , which effectively tailor electron dense and distribution for an effective electron attenuation, and thus improve the radiation resistance of the MOSFET. Theoretical calculations further reveal that the packed MOSFETs present the less shifted voltage and trapped charges compared with the pristine one. This work provides an interface engineering strategy for developing radiation hardened MOSFETs.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Wei-Ming Guo,Zhi-Lin Zhang,Jing-Xi Li,Yang You,Shang-hua Wu,Hua-Tay Lin
Al 2 O 3 –B 4 C ceramics had poor densification, due to the formation of Al 18 B 4 O 33 phase by reaction between Al 2 O 3 and B 2 O 3 on the surface of B 4 C. In the present work, Y 2 O 3 or Ti additive together with ZrO 2 from milling media were introduced into Al 2 O 3 –B 4 C ceramics. Results showed that Y 2 O 3 reacted with B 2 O 3 to produce YBO 3 phase, and removed Al 18 B 4 O 33 phase, resulting in the improved densification and the coarse microstructure. However, Ti and ZrO 2 reacted with B 2 O 3 to produce hard TiB 2 and ZrB 2 phases, removed the most of Al 18 B 4 O 33 phase, refined microstructure by pinning effect of hard particles, and improved densification and mechanical properties .
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Haoyue Fu,Weixin Qian,Haitao Zhang,Hongfang Ma,Weiyong Ying
Unmodified Cr/Al 2 O 3 and Cr/Al 2 O 3 doping with different alkali metals (Li, Na, K) were prepared by the incipient wetness impregnation method. The surface elements of all the catalysts are evenly distributed and well loaded, and the addition of alkali metals does not change the crystal structure and surface texture. Both Cr 6+ and Cr 3+ species exist on all catalysts, and the addition of alkali metals can increase the amount of Cr 6+ species, and Cr 6+ species are basically converted into active Cr 3+ species in the reaction thus increasing the initial propane conversion in the reaction. The addition of alkali metals reduced the amount of total acid sites and the strong acid sites of the catalyst, thus inhibiting the occurrence of side reactions and the formation of carbon deposition , and reducing the deactivation rate of the catalyst. Cr-0.5Na/Al 2 O 3 exhibited the best catalytic performance and the lowest carbon deposition.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）