ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Kun Li,Chengjie Duan,Weitao Mao,Dongliang Wang,Yumeng Liang,Wenbo Ye,Guangke He,Xiang Liu
A direct and efficient synthesis of N-methyl-1,2,3,4-tetrahydroquinolines (MTHQs) is achieved through the one-pot reductive N-methylation of quinolines. The SnOx-decorated Pt/Al2O3 (Pt-SnOx/Al2O3) catalyst proves to be highly effective in the transformation from quinolines to MTHQs, using methanol as the exclusive source for hydrogen (H) and methyl (CH3), without the addition of additional bases or additives. Mechanistic and kinetic studies reveal a tandem reaction pathway: (1) the dehydrogenation of methanol, (2) reduction of quinolines to 1,2,3,4-tetrahydroquinolines (THQs), and (3) N-methylation of THQs to MTHQs, with the dehydrogenation of methanol identified as the rate-determining step. Characterization and catalytic performance results demonstrate that SnOx modifies the morphology and electronic properties of Pt-based metal active sites, which dramatically facilitates the cleavage of O–H and less reactive C–H bonds in methanol, and maintains a delicate balance between methanol dehydrogenation and reductive N-methylation of quinolines, thus obtaining a high reactivity for the total transformation.
研究领域:
催化化学
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有机合成
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2020
·
IF 2.463
Jing Liu,Weiyan Sun,Jie Bai,Chunping Li
Nitrogen-enriched carbon nanofibers carried Sn and Zn bimetallic composites with outstanding storage capacity and superior mechanical strength were facilely fabricated by electrospinning technology, amidoximation reaction modified polymer fiber, ion coordination technique introduced Zn 2+ and carbonization of composite nanofibers. The introduction of amidoxime groups not only enhanced the coordination ability with Zn 2+ , but also increased the content of nitrogen element. In addition, due to the different thermal stability of amidoxime groups, the regulation of different types of nitrogen content can be achieved by changing the carbonization temperature, and the influence of nitrogen on the electrochemical performance was explained. At the same time, due to the role of carbothermal reduction , tin in different valence ratios was obtained and its contribution to the energy storage performance of supercapacitors was explored. Benefiting from high nitrogen-enriched level, mutation between Sn 2+ and Sn 4+ oxidation state and synergistic mechanism of ZnO-SnO x bimetal, the prepared composite had a high specific capacitance of 810.89 F g −1 at a current density of 0.5 A g −1 , outstanding cycling stability of 119% over 5000 cycles in 4 M KOH electrolyte. What’s more, we conducted a two-electrode test with the energy density of 50 Wh kg −1 at a power density of 374 W kg −1 . In consequence, this novel design is believed to have great potential in high energy and power density of energy storage devices in the future.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
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2020
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IF 2.12
Honglong Ning,Xu Zhang,Shuang Wang,Rihui Yao,Xianzhe Liu,Danqing Hou,Qiannan Ye,JinXiong Li,Jiangxia Huang,Xiuhua Cao,Junbiao Peng
SnO x films were prepared by sol-gel spin coating technology on glass substrates at low temperature. Through the optimization of the solution process, the quality of the film was effectively improved. And the effects of rotating speed, substrate pretreatment and precursor concentration and other parameters on the films were emphatically discussed. It is found that the formation of the impurity particles and holes can be reduced and the film roughness can be decreased by treating the substrate with plasma. Adding a low-speed spin coating process before high-speed spin coating can significantly reduce the roughness of film. The roughness of film decreases, and the edge shrinkage phenomenon of film is improved with the increasing spin-coating speed. The thickness of the film increases linearly with the solution concentration, but the high concentration of precursor is easy to lead to the cracks of films. Based on the optimized solution process, SnO x films with flat, smooth surface (Rq = 0.25 nm) and high transparency (visible light transmittance >90%) can be prepared at low temperature, which is expected to be used in devices based on transparent films.
研究领域:
材料科学
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薄膜技术
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2014
·Vol. 16
·期 24
·12521-12534
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IF 4.198
Quan Gu,Jinlin Long,Huaqiang Zhuang,Chaoqiang Zhang,Yangen Zhou,Xuxu Wang
A variety of ternary nanoheterostructures composed of Pt nanoparticles (NPs), SnOx species, and anatase TiO2 are designed elaborately to explore the effect of interfacial electron transfer on photocatalytic H2 evolution from a biofuel–water solution. Among numerous factors controlling the H2 evolution, the significance of Pt sites for the H2 evolution is highlighted by tuning the loading procedure of Pt NPs and SnOx species over TiO2. A synergistic enhancement of H2 evolution can be achieved over the Pt/SnOx/TiO2 heterostructures formed by anchoring Pt NPs at atomically-isolated Sn-oxo sites, whereas the Pt/TiO2/SnOx counterparts prepared by grafting single-site Sn-oxo species on Pt/TiO2 show a marked decrease in the rate of H2 evolution. The characterization results clearly reveal that the synergy of Pt NPs and SnOx species originates from the vectorial electron transfer of TiO2 → SnOx → Pt occurring on the former, while the latter results from the competitive electron transfer from TiO2 to SnOx and to Pt NPs.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Hua Wang,Yunchuan Tu,Sijun Li,Yimin Jiang,Niandan Zhao,Wenbin Wang,Wei Shen,Ming Li,Rongxing He
Efficient electrocatalytic co-reduction of CO 2 and NO 3 − to urea involves simultaneous generation and stabilization of C- and N-coupling intermediates. Herein, we report positive feedback at the interfaces of an AuPd/SnO x catalyst that enables generation and stable co-adsorption of *CO and *NH 2 OH at low-potential, fostering efficient C-N coupling for urea formation. A combination of in-situ spectroscopic analyses and theoretical calculations show that *CO 2 captures electrons by bonding to the AuPd/SnO x interface, leading to positively charged Pd sites, which promote the NO 3 RR to give the key N-intermediate *NH 2 OH. The adsorbed *NH 2 OH provides electron feedback to the catalyst surface , which not only enhances the adsorption of CO 2 and promotes the conversion of *CO 2 to *CO to accelerate the CO 2 RR, but also enhances the adsorption strength of the catalyst for *CO. Owing to this positive feedback, the Faraday efficiency and yield of urea reached 21.3 % and 1280.5 μg∙h −1 ∙mg −1 at −0.2 V (versus the relative hydrogen electrode), surpassing the performance of most previously reported catalysts. This finding provides new insights into catalyst design for advancing C-N coupling systems.
研究领域:
化学
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材料科学
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催化反应
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Wenyao Feng,Changzhou Chen,Jiahao Zhao,Lu Li,Qinglei Xu,Wenqiang Qi,Jiawei Li,Hui Zhao,Guangfu Qian,Minsheng Lu,Douyong Min
Natural wood, a porous lignocellulosic resource, is an ideal precursor for carbon frameworks owing to its renewability. However, achieving a high electromagnetic shielding effectiveness poses a tremendous challenge for lignocellulose-based carbon framework. Herein, we developed a new material (FeNi-SnOx/CW) by embedding FeNi alloy and SnOx nanoparticles in carbonized lignocellulose framework (CW) from delignified wood using interface engineering modification. The CW acted as a conductive scaffold, while FeNi-SnOx enhanced polarization and magnetoelectric properties. Due to the synergistic effect of multiple mechanisms, the FeNi-SnOx/CW achieved excellent conductivity (437.3 S/m) and high saturation magnetization (13.33 emu/g). It also demonstrated a high EMI SE of 91.2 dB and a high ratio of SE A /SE T up to 85 % across the X-band at 2 mm thickness. Significantly, the interface engineering modification has resulted in a 59.2 dB enhancement in the EMI SE properties of the composite material compared to the pure CW (32.0 dB). Surface hydrophobicity modification with PDMS of the FeNi-SnOx/CW composite had a negligible impact on its EMI SE, thereby highlighting its practical potential. This research shows the benefits of FeNi-SnOx in boosting EMI shielding and offers a way to use renewable wood-based lignocellulose for high-performance EMI shielding materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2019
·
IF 2.983
Yejing Jia,Bing Zhang,Honghong Chang,Feiyan Yu,Zhihuan Zhao
A simple colorimetric immunoassay based on visible light excitation for detection of carcinoembryonic antigen (CEA) was developed. Firstly, visible light photocatalysts of TiO 2 /SnO x -Au ternary heterostructures were prepared by in situ reduction method, which were characterized using transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD) and UV–vis diffuse reflectance spectroscopy (DRS). Then, a novel sandwich-type colorimetric immunoassay for quantitative analysis of CEA by using TiO 2 /SnO x -Au nanoparticle as signal tag was constructed. Under visible light irradiation (λ ≥ 420 nm), the color development of TMB was obtained. And the quantitative analysis was carried out in ABS buffer solution by ultraviolet spectrum scanning. Under optimal conditions, the absorbance values increased with the increasing of CEA levels in samples, which presented linear relationship in the range of 5 pg mL −1 –2.5 ng mL −1 with a detection limit of 5 pg mL -1 . Meanwhile, the colorimetric immunosensor owned acceptable specificity, stability and reproducibility.
研究领域:
生物医学工程
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免疫学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Qinglong Liu,Mingsheng Luo,Zhen Zhao,Qiuna Zhao
Sn-containing dendritic mesoporous silica nanoparticles (Sn-DMSNs) were successfully prepared by the in-situ co-assembly method. Sn-DMSNs preserve original structural characteristics with three-dimensional and center-radial pore structure. The nanoparticle sizes of Sn-DMSNs can be controlled systematically from 170 nm to 360 nm depending on the molar ratio of NaSal/CTAB. Sn species are incorporated into the matrix of silica and the highly dispersed SnO x species are achieved. Sn-DMSNs catalysts exhibit excellent catalytic performance and stability in the propane dehydrogenation. The highly dispersed SnO x species rather than polymeric SnO x or crystalline SnO 2 species contribute to the activation of propane and formation of propylene. The molar ratio of NaSal/CTAB also shows an important role in the structure of support and SnO x species. The excellent stability of Sn-DMSNs catalysts can be ascribed to the good ability to restrain coke formation and strong interaction between SnO x species and silica. The effect of potassium on Sn-DMSNs catalyst is also investigated.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Xiao Wang,Wenjing Liu,Tongkai Wang,Yuli Zhao,Gang Zhao,Shouwei Zhang,Jinzhao Huang,Xijin Xu
Amorphous/crystalline heterophase composites possess expansive reaction interfaces and abundant oxygen vacancy defects, providing novel electron-hole transmittal mode and significantly facilitating the surface adsorptions and redox reactions . Herein, galvanic replacement reaction (GRR) was used to construct amorphous SnO x / crystalline Co 3 O 4 multishell heterostructures . Characterizations indicated the continuous transition from Co 3 O 4 to amorphous SnO x on each shell, generating abundant amorphous/crystalline interfaces. Moreover, the oxygen vacancy defects concentration also increased with the GRR proceeding. Benefitting from theses, the surface oxygen adsorption was facilitated due to more surface active sites and enhanced carrier densities. However, with further increasing the reaction time, decreased adsorbed oxygen concentrations were detected, owning to the unexpected high potential barriers induced by excessive heterojunctions . Gas sensing results showed that the sensors with 1 h GRR exhibited the best sensing performance with an exceptional response (1268) to 100 ppm formaldehyde gas and low detection limit (21 ppb) at low working temperatures (100 °C). The synergistic effects between oxygen vacancy defects and amorphous/crystalline heterophase interfaces on the superior gas sensing behaviors were also investigated. Most importantly, results presented will shed lights on the rational design of highly sensitive gas sensors through amorphous/crystalline interfaces constructions.
研究领域:
材料科学
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传感器技术
·
表面化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Ke Wang,Armin Rezayan,Linqi Si,Yongsheng Zhang,Renfeng Nie,Tianliang Lu,Jianshe Wang,Chunbao Xu
Catalytic conversion of glucose to 5-hydroxymethylfurfural (HMF) is a highly desirable routine for producing value-added chemicals. Herein, by using glucose as carbon source to fabricate porous carbon support, SnCl4 and citric acid were selected for forming Lewis acidic/basic SnOx and Brønsted −COOH over support, respectively, bifunctional solid acid tin oxide/carbon catalysts were prepared by a hydrothermal-pyrolysis strategy. It is found that the acid density of SnOx/C could be tuned by adjusting SnCl4 dosage and pyrolysis temperature. In a H2O-NaCl/THF biphasic system, 92.1% glucose conversion and 84.1% HMF yield were achieved over an optimized 3.0-SnOx/C-500 catalyst at 180 °C for 2 h. This catalyst demonstrates excellent recyclability in this reaction for five times and is also versatile for one-pot transformation of cellulose to HMF with 39.9% yield. The superior performance of 3.0-SnOx/C-500 could be ascribed to its highly dispersed SnOx nanoparticles, a suitable ratio of Brønsted to Lewis acids, as well as accessible pore-structure of the catalyst.
研究领域:
化学工程
·
催化
·
可再生能源
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Jing Liu,Tong Xu,Xingwei Sun,Jie Bai,Chunping Li
Flexible and portable supercapacitors as a variety of energy storage devices are used in wearable electronic devices. However, the practical application of flexible supercapacitors is still restricted by comparatively poor performance. Herein, we have successfully prepared porous carbon nanofibers supported Sn and Zn bimetallic composites as flexible and freestanding electrode material in supercapacitors. Sn element encapsulated in nano-fiber films were prepared by electrospinning technique, the SnO x -ZnO/MCNFs composites were formed by immersion of different proportions of Zn 2+ , and further high temperature carbonization process. In addition, on the basis of comparative experiments, a possible mechanism for effective synergy between the two metals were raised. The specific capacitance of SnO x -ZnO/MCNFs-10 mmol/L at 0.5 A g −1 is 783 F g −1 with the retention rate of 87% after 5000 cycles, which is higher than their respective counterparts SnO x /MCNFs (599 F g −1 ) and ZnO/MCNFs (429 F g −1 ). Moreover, a flexible all-solid-state asymmetric supercapacitor (ASC) was further assembled with the energy density of 37.7 Wh kg −1 at the power density of 374.9 W kg −1 , and long-term cyclic stability (76.2% after 5000 cycles). The reason for the remarkable electrochemical performance could be the reasonable combination of the two electrode materials, which provides a new idea for the application of composite materials in supercapacitors.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wen Guo,Lixin Song,Jinhuan Jiang,Tianguang Guo,Chenyang Shi,Xin Yin,Jie Xiong
The enhancement in efficiency and stability of air-processed perovskite solar cells (PSCs) have garnered increasing attention. Carbon-based composite materials additives, due to their excellent electrical conductivity, outstanding stability and high flexibility, provide a novel idea for improving the performance of perovskite films as well as PSCs. In this study, the superfine SnO x /carbon composite nanofibers (SnO x /C NFs) with the average diameter of 26 nm was doped into perovskite films and modulating perovskite crystallization. The SnO x /C NFs provided a uniform heterogeneous nucleation site, regulate the crystal morphology of perovskite films via Sn-I coordination and O/(MA + , FA + ) electrostatic coupling, passivated the organic cations and Pb 2+ vacancy defects within the perovskite structure, and enhanced the overall quality of the films. The distinctive one-dimensional structure of SnO x /C NFs provides additional channels for charge transport, thereby facilitating more efficient charge extraction and effectively alleviating device defects. In addition, the flexible nanofibers released the residual stress and enhanced the stability of the devices. The power conversion efficiency (PCE) of the champion device with low hysteresis prepared under open-air conditions was 22.32 %. The champion device maintained initial PCE of 80.3 %, 90.6 % and 86.6 % under 55 ± 5 % RH for 1200 h, 85 °C for 500 h and AM 1.5 light illumination for 500 h, respectively. In addition, the SnO x /C NFs-based flexible-PSCs (f-PSCs) achieved a champion efficiency of 19.84 % and retained 92.13 % of their initial PCE after 300 cycles (radius = 7 mm).
研究领域:
材料科学
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纳米技术
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光伏技术
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化学工程
·
固体物理
✓ 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）