JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
·
IF 11.2
Rong Liu,Yan Gao
Preparing metal-organic frameworks (MOFs) film in situ on the surface of the Ti-6Al-4V (TC4) titanium alloy is challenging owing to the dense and stable surface TiO 2 passive film. In this study, titanium-doped zirconium-based MOFs (Zr(Ti)-MOFs) film was constructed in situ on the TC4 alloy in one step at a low temperature and atmospheric pressure, with ZrCl 4 as the source of Zr metal ions. ZrCl 4 attacked and dissolved the TiO 2 film to form Zr-O-Ti bonds on the surface of TC4 to provide nucleation sites for further reactions. At the same time, Zr 4+ and dissolved Ti 4+ combined in solution to form Ti containing Zr-O cluster nodes, which aggregated and grafted to the Zr-O-Ti bonds on the substrate surface, and reacted with organic ligands (terephthalic acid) to form Zr(Ti)-MOFs film. The Ti 4+ dissolved from the TC4 participate in the Zr-MOFs formation, thereby changing the high temperature and high-pressure conditions required for the traditional preparation of Zr-MOFs (UiO-66). The in situ preparation of Zr(Ti)-MOFs on TC4 was achieved at 80°C under atmospheric pressure conditions. This study elucidated the growth mechanism of Zr(Ti)-MOFs on the TC4 surface, providing a reference for the design and in-situ preparation of multifunctional MOFs on the TC4 titanium alloy.
研究领域:
材料科学
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表面工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xin Guo,Zhiyong Ding,Na Kang,Liu Yang,Yuanjiang Wang,Cheng Zhang,Zhaoqiang Li,Tiantian Zhang,Yan Wang,Yu Wang,Hao Qu
The zeolite-based catalyst is a promising option for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) due to its low toxicity. However, the challenge lies in its low-temperature activity. This study developed a multi-component catalytic system consisting of Ce/Mn/Cu-loaded Beta zeolite to reduce NO x . With fixed contents of Cu and Mn, we investigated the NH 3 -SCR process and the mechanism of action of the rare-earth species (i.e., Ce) in the system. Upon optimization of the content of Ce, the Ce/Mn/Cu-loaded Beta zeolite demonstrated enhanced low-temperature activity compared to samples loaded with Cu or Cu/Mn in the temperature range of 150–250 °C. When Ce was loaded in an appropriate proportion, it regulated the oxidation state of Cu, optimizing active adsorption species for NO and strengthening the strength of Brønsted acid sites in the catalyst. These synergetic effects led to improved NH 3 -SCR catalytic performance. This study can contribute to a better understanding of multiple metal-loaded zeolites in the NH 3 -SCR process and inform future design of Beta-type catalysts.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 15
·12061-12067
·
IF 3.289
Junling Zhang,Shimou Chen,Haitao Zhang,Suojiang Zhang,Xue Yao,Zhaohui Shi
Crystalline silicon (Si) is widely used in modern electronics. Si is commonly produced through a series of energy-intensive reactions (>700 °C). It is thus urgent and significant to explore more economically and environmentally-benign synthetic strategies for crystalline Si at low temperature. In this contribution, we report an efficient method to prepare crystalline Si from silicon tetrachloride at the low temperature of 100 °C with an ionic liquid (IL) as electrolyte. Physicochemical characterization revealed that as-deposited crystalline Si with a diamond cubic crystal structure exhibited a dominant (111)-orientation. Moreover, in-depth insights into the growth mechanism of crystalline Si was shed light upon herein. Furthermore, the smart electrodepositing platform of crystalline Si from ILs would open up a new avenue for low-temperature metallurgy of Si.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wei Liu,Ding Gu,Xiaogan Li
A novel chemiresistive-type sensor for detecting sub-ppm NO2 has been fabricated using AuPt bimetal-decorated SnSe2 microflowers, which was synthesized by the hydrothermal treatment followed by in situ chemical reduction of the bimetal precursors on the surface of the petals of the microflowers. The as-prepared sensor registers a superior performance in detection of sub-ppm concentration of NO2. Functionalized by the AuPt bimetal, the SnSe2 microflower-based sensor shows a response of approximately 4.62 to 8 ppm NO2 at 130 °C. It is significantly higher than those of the sensors using the pristine SnSe2 (∼2.29) and the modified SnSe2 samples by a single metal, either Au (∼3.03) or Pt (∼3.97). The sensor demonstrates excellent long-term stability, signal repeatability, and selectivity to some typical interfering gaseous species including ammonia, acetone, formaldehyde, ethanol, methanol, benzene, CO2, SO2, and CO. The remarkable improvement of the sensitive characteristics could be induced by the electronic and chemical sensitization and the synergistic effect of the AuPt bimetal. Density functional theory (DFT) is implemented to calculate the adsorption states of NO2 on the sensing materials and thus to possibly reveal the sensing mechanism. The significantly enhanced response of the SnSe2-based sensor decorated with AuPt bimetallic nanoparticles has been found to be possibly caused by the orbital hybridization of O, Au, and Pt atoms leading to the redistribution of electrons, which is beneficial for NO2 molecules to obtain more electrons from the composite material.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Zhi Liu,Minmin Wang,Shoujie Liu,Zheng Chen,Lingzhi Yang,Kaian Sun,Yanju Chen,Lingyou Zeng,Wenhong Wang,Jinchong Zhao,Guangxun Sun,Bin Liu,Yuan Pan,Yunqi Liu,Chenguang Liu
The biggest challenge for selective catalytic reduction (SCR) of NO by NH 3 at low temperatures is to develop robust catalysts with high resistance to SO 2 . Mn-based catalysts have attracted great attention for their excellent activity, but the poor SO 2 resistance limits their application. Herein, we report a novel assembled composite featuring Mn 3 O 4 nanoparticles embedded in defect-abundant graphitic carbon frame (Mn 3 O 4 @G-A) via a confinement–pyrolysis–oxidation strategy derived from MOF. The Mn 3 O 4 @G-A exhibits excellent activity (reaching over 90 % NO conversion in 100, 000 h −1 GHSV at 160 °C) and significantly improved SO 2 resistance in comparison to pristine Mn 3 O 4 , and all the performance tests were conducted with 5.6 vol.% water vapor. By combining synchrotron radiation-based X-ray absorption spectroscopy and density functional theory calculation, we further discovered the positive role and the origin of graphitic carbon for improving SO 2 resistance. Over the Mn 3 O 4 @G-A sample, the electrons can be transferred from graphitic carbon to Mn 3 O 4 nanoparticles, which can regulate the electronic properties and oxidizing ability of Mn 3 O 4 nanoparticles. The proper oxidizing ability of Mn 3 O 4 @G-A can inhibit the oxidation of SO 2 to SO 3 , thus further avoid the formation of NH 4 HSO 4 and improve the SO 2 resistance. Our work here not only solves the current problem of poor SO 2 resistance of Mn-based catalysts, but also provides new insights into the design and synthesis of MOF-derived graphitic carbon-containing catalysts for SCR applications.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2019
·
IF 7.181
Fan Zhou,Ningyi Pan,Hongyu Chen,Xiang Xu,Chunhao Wang,Yankun Du,Yang Guo,Zheng Zeng,Liqing Li
Ni-Mg-Al hydrotalcite-derived materials promoted with Ce, Zr or Fe were prepared by the co-precipitation method, which exhibited excellent performance in steam reforming of toluene (SRT) at low temperature. Especially, Fe-doped catalyst had higher catalytic activity and stability at 400 °C, which maintained almost 100% toluene conversion during the SRT reaction (3 h). Moreover, it also had higher hydrogen production and better selectivity for hydrogen production. The physico-chemical characterizations and model simulation indicate its high dispersion of active sites and accessibility of reactants to active sites: uniform dispersion of active sites (SEM, TEM and EDX), large specific surface area (151 m 2 /g), pore volume (0.84 cm 3 /g) and average pore diameter (22.1 nm), small crystallite size (34.9 nm), desirable Ni species reducibility (TPR), high basicity (TPD), low metal carbide formation (XPS), and good adsorption affinity with toluene (−18.391 kJ mol −1 , DFT). Moreover, less carbon was deposited on the Fe-containing catalyst through measuring the amorphous carbon and CNTs by the TG-MS method, which was due to the tip-growth mechanism of CNTs. Considering lower toluene conversion temperature, higher hydrogen yield, and better resistance to carbon deposition, this study may be meaningful in development of SRT at low temperature.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Boyan Fu,Leyao Bi,Jiahui Lin,Junsheng Wen,Jiaxing Fu,Binglin Zou,Chunjie Wang,Yue Wang
High-entropy perovskites (HEPs) have attracted significant attention due to their unique design concepts, excellent stability, and cocktail effect, which often endow them with extraordinary properties. However, their applications in the sensing field have been relatively underexplored. In this study, we prepared (La 0.2 Pr 0.2 Sm 0.2 Gd 0.3 Yb 0.1 )FeO 3 ((LPSGY)FO) high-entropy materials with varying A-site configuration entropy for the first time by the ultrasonic sequential precipitation method. This synthesis process is remarkably simple, as it requires neither complex equipment nor tedious steps, and it does not involve any auxiliary or modification treatments. Furthermore, this work primarily focuses on investigating the gas-sensing performance of (LPSGY)FO materials. Experimental results show that the (LPSGY)FO gas sensor responds exceptionally well to acetone (38.44) at lower temperatures (175℃), demonstrating rapid response/recovery time along with outstanding repeatability. Notably, its detection limit can reach as low as 200 ppb. This study demonstrates the promising application of high-entropy materials in gas sensing, showcasing their capability for high-performance detection under low-temperature conditions. The findings contribute to the ongoing development of cost-effective gas sensors and suggest directions for future research in this field.
研究领域:
材料科学
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化学传感器
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Jiaxin Yang,Wenju Tao,Jiaming Li,Lingyu Kong,Shaohua Wu,Jingui He,Zhaoshun Liu,Yu Sun,Chao Fan,Zhaowen Wang
Low-cost and environmentally friendly recycling methods can incorporate strategic elements from discarded lithium-containing aluminum electrolytes (LiAE), which is crucial for alleviating resource shortages and environmental footprint. This study aims to develop a method for the comprehensive utilization of LiAE through low-temperature leaching of calcification. Unlike traditional high-temperature acidification roasting/ transformation processes (320–850 °C), the calcification leaching method only involves one-step leaching and avoids high heat energy consumption. Besides, this low-temperature calcification method chemically destroys the crystal structure of metal fluorides (Li, Na, K, etc.), ensuring a high leaching rate while ensuring an alkaline environment for lithium extraction from the leaching solution without additional alkaline neutralization. The lithium extraction rate exceeds 96 %, with high-purity Li 2 CO 3 and NaOH prepared. The CaCO 3 produced by decalcification has the potential for recycling (in the form of CaO after calcination). Meanwhile, the effects of operating temperature, mass ratio of CaO to LiAE, liquid–solid ratio, and leaching time on the calcium leaching reaction were systematically studied. The economic benefits and creative evaluation of the process were evaluated. Finally, the regenerated LCO prepared from recycled Li 2 CO 3 has been proven to have good electrochemical performance compared to commercial LCO, demonstrating the feasibility of energy storage application. In summary, the comprehensive utilization of LiAE by the calcium leaching method has been proven to be feasible.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yan Qian,Haibang Zhang,Yan Xiong,Yinzuo Wu,Ziyue Fu,Pingchun Guo,Hedong Jiang,Jiake Li,Yanxiang Wang,Shijin Yu,Hua Zhu
The detection of low concentration hydrogen sulfide (H 2 S) gas is of paramount importance for environmental safety and human health, given its colorless, toxic, and flammable nature. In this study, heterostructure material composed of SnO 2 nanorods modified with NiO nanosheets were synthesized, which significantly improved the detection performance of the sensor for hydrogen sulfide (H 2 S) gas at low temperatures by combining the interaction between oxygen vacancies and built-in electric fields. The formation of heterojunctions was verified using X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the existence of oxygen vacancies was further confirmed through electron paramagnetic resonance (EPR) spectroscopy. The heterojunction sensor, when modified with 3 mol% NiO, exhibited an exceptional response value of 386 towards 10 ppm H 2 S at 125 °C, with a rapid response time of 6 s, surpassing that of the pristine SnO 2 sensor. This superior performance can be attributed to the synergistic effect of oxygen vacancies between SnO 2 and NiO, along with the inherent electric field present in the heterojunction. The study showcases the remarkable selectivity and long-term stability of this sensor in detecting hydrogen sulfide gas, offering innovative insights for the advancement of low-temperature and highly sensitive H 2 S gas sensors.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2024
·
IF 2.3
Xu Feifei,Dong Xin,Jia Qian,Chen Ruoyu
Mechanical strength is an important factor that affects and limits the life of surface antireflective (ARC) coatings such as optical lenses, photovoltaic panels, and liquid crystal displays. In this work, a network-structured silica sol was prepared using tetraethyl orthosilicate (TEOS) and methyltriethoxysilane as silicon sources. Triethoxy(1H,1H,2H,2H-nonafluorohexyl)silane (C 4 FTES) was used to modify the acid-catalyzed silica sol. Finally, the mixed sol was plated on the surface of polymethyl methacrylate by impregnation-pulling method. The coating obtained after drying at 100°C showed a maximum transmittance of 97.98% in the visible wavelength range (400–800 nm). The coating still maintained good optical properties after undergoing various wear-resistant tests such as sandpaper abrasion and cotton ball friction. Moreover, the pencil hardness test of the coating improved from 5B to 3H after it was modified by short-chain perfluoroalkyl groups (C 4 FTES). This work required only low-temperature treatment without calcination to prepare a silicon-based ARC coating formed by copolymerization of C 4 FTES and TEOS, and the mechanical properties of the coating meet actual needs. This easy-to-operate preparation method greatly expands the application scope of silicon-based ARC coatings in the field of heat-sensitive materials. Graphical abstract The polymethyl methacrylate (PMMA) substrate is coated with a fluorine-containing coating with a network structure, which greatly improves the transmittance and surface hardness of the substrate.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jianhua Zhu,Qian Xiao,Ting Zhang,Yefeng Yin,Yang Liu
The effects of acceptor dopant (typical Mn 2+ ) and donor dopant (typical V 5+ ) on the reliability of Li 2 ZnTi 3 O 8 based low temperature co-fired ceramics (LTCC, in short) have been investigated. Large difference occurs among different types of dopants. V 5+ doping decreases the breakdown voltage of the multilayer capacitors which were manufactured by low temperature sintered Li 2 ZnTi 3 O 8 ceramics, however, Mn 2+ doping increases the breakdown voltage and lowers down the leakage current significantly. This may very likely due to the fact that donor induces the generation of weak bound electrons while acceptor capture the weak bound electrons. The results suggest that Mn 2+ is a very effective additive for improving the reliability of low temperature sintered Li 2 ZnTi 3 O 8 ceramics.
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
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2013
·Vol. 96
·期 7
·2046-2049
·
IF 2.107
Songping Wu,Qing Ma,Fan He
Zn 2 GeO 4 ceramic materials were synthesized by the solid-state method. Zn 2 GeO 4 powders were investigated with X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Oxygen defects in the Zn 2 GeO 4 ceramics were investigated by photoluminescence, Raman, and EDS spectra. Conductivity of Zn 2 GeO 4 was 0.18 S/cm at low temperature of 773 K, and its activation energy was 0.49 eV. The results showed that Zn 2 GeO 4 was a promising low-temperature electrolyte with high conductivity.
研究领域:
材料科学
·
电化学
✓ 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）