Materials Horizons
·
2025
·
IF 10.7
Jian-Hui Zheng,Chang-Long Tan,Ming-Yu Qi,Zi-Rong Tang,Yi-Jun Xu
Harnessing the power of photoredox catalysis for the selective C(sp3)−H activation and oxidation of alkyl aromatics represents a cutting-edge approach to transforming petroleum-derived feedstocks into value-added C(sp3)−C(sp3) coupled chemicals. Herein, we delve into the photocatalytic process that involves the selective dehydrocoupling of ethylbenzene (EB) to access 2,3-diphenylbutane (DPB) alongside H2, employing three sulfur source-varied ZnIn2S4 (denoted as ZIS-x) catalysts. ZIS-TAA, with thioacetamide (TAA) as sulfur source, exhibits exceptional photocatalytic efficiency for DPB and H2 production. The results show the deficiency of charge carrier recombination centers in defect-poor ZIS-TAA is conducive to the separation of photogenerated charge. Additionally, the larger specific surface area and more surface functional groups provide abundant sites for reactant adsorption and activation, facilitating redox process aided by an ideal band-edge structure. This work illustrates a simple and cost-effective paradigm for designing semiconductor-based photocatalysts with tailored surface properties to enhance the efficiency of target cooperative photoredox reaction.
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产品关联
DOI
PubMed
高影响因子
Nano Select
·
2021
·Vol. 2
·期 9
·1770-1778
·
IF 0
Xiaoyan Wang,Axel Funke,Ya-Jun Cheng,Fang Song,Shanshan Yin,Suzhe Liang,Xiuxia Zuo,Jie Gao,Peter Müller-Buschbaum,Yonggao Xia
Continuous fast pyrolysis is developed for in situ synthesis of ultra-small metal oxide nanoparticles embedded into three-dimensional macroporous carbon matrix as demonstrated by the TiO 2 /carbon nanohybrid. The TiO 2 nanoparticles with the average size of 4.6 nm ± 0.6 nm are uniformly distributed in the in situ generated macroporous carbon matrix. When evaluated as an anode in a lithium-ion battery, the macroporous TiO 2 /C nanohybrid exhibits a reversible capacity of 483 mAh g –1 after 500 cycles at a current density of 67 mA g –1 , which is 3.6 times higher than that of the TiO 2 /C calcined in a conventional batchwise way. Besides, the capacity retains 93 mAh g –1 at a high current density of 670 mA g –1 . It reveals that the continuous fast pyrolysis is an efficient method to fabricate carbon composition based metal oxides as lithium-ion battery anode materials.
研究领域:
材料科学
·
能源技术
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DOI
Small
·
2021
·Vol. 17
·期 19
·2100082
·
IF 13.281
Jiatong Wei,Yanping Chen,Yanfu Ma,Xin Shi,Xiaoli Zhang,Chunjing Shi,Ming Hu,Jian Liu
Fischer-Tropsch synthesis (FTS) is an effective route to produce olefins, gasoline, diesel, and oxygenates from syngas (CO + H 2 ). However, it still remains a challenge for regulating the product distribution of FTS. Here, a series of Co/C sub-microreactors with precise designed nanoarchitectures are synthesized for selective syngas conversion. Through a combination of surface protection-assisted etching and following carbonization process, Co/C sub-microreactors with solid cube, double-shelled hollow box, and hollow box architectures, namely, Co/C-Cube, Co/C-DBox, Co/C-Box can be obtained. In FTS, comparing with solid Co/C-Cube, double-shelled hollow structured Co/C-DBox is inclined to grow long-chain hydrocarbon products, whereas hollow structured Co/C-Box avails the formation of short-chain hydrocarbon chemicals. Therefore, shape selective catalysis and controlled product distribution of FTS are realized by tuning the architectures of Co/C sub-microreactors. It is expected to fundamentally unravel the heterogeneous catalytic process via upfront designing and precisely regulating the architectures of micro/nanoreactors.
研究领域:
化学工程
·
材料科学
·
催化科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11013-11025
·
IF 4.682
Luo Guoqiang,Li Peibo,Hu Jianian,Guo Jingwei,Sun Yi,Shen Qiang
The purpose of this paper was to design an Al–Cu–Ag–C material system to address the deterioration of mechanical properties caused by intermetallic compounds generated during Al–Cu sintering. The in situ pyrolytic C layer was encapsulated on the surface of the raw material particles, which prevented Al–Cu diffusion and reduced the generation of intermetallic compounds. The microstructure of the Al–Cu–Ag–C composites illustrates that several alloy phases of Al 2 Cu, Al 4 Cu 9 , and Ag 2 Al are formed. The addition of Ag significantly improved the mechanical properties of the composite due to the formation of the Ag 2 Al phase and Cu–Ag solution. The tensile strength and compressive strength of Al–52Cu–3Ag–C are increased by 123.9% and 64.9% over Al–52Cu–C, and the strain is also considerably improved. The strength enhancement derived from the Orowan strengthening contributed by Ag 2 Al, and the solid solution strengthening contributed by Ag–Cu solid solution, respectively. The presence of Ag 2 Al also enhances the hardness of the composite.
研究领域:
材料科学
·
力学
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DOI
高影响因子
Geopolitics
·
2019
·
IF 2.756
Oliver Dunnett
This paper addresses geopolitical cultures of outer space by examining the selected life and works of Arthur C. Clarke (1918–2008), one of the leading space technology advocates of the twentieth century, in the specific context of his adopted home of Ceylon/Sri Lanka. Within the framework of studies that have connected critical geopolitics and science, further discussions concerning the interface between imperialism, technology and tropicality help demonstrate the relevance of Clarke’s geographical imagination to understanding geopolitical cultures of outer space. Three aspects of Clarke’s life and works are examined: First, his underwater exploration activities in Ceylon from the late 1950s to the early 1970s; second, his 1979 Hugo and Nebula Award-winning novel The Fountains of Paradise; and finally, his promotion of Sri Lanka as a future hub of outer space technologies in the early 1980s. The paper suggests that geopolitical readings of outer space can be understood through investigating diverse aspects of place, landscape and identity.
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Furong Qin,Hongxing Hu,Yongjia Jiang,Kai Zhang,Zhao Fang,Yanqing Lai,Jie Li
A mesoporous MoSe 2 /C composite is synthesized through a nano-casting technique along with heat treatment. Nano-silica particles are used as templates to create mesopores . Homogeneously dispersed Molybdenum and selenium particles in the starch substrate are reacted with each other to formed MoSe 2 nanosheets when subjected to heat-treatment. Meanwhile, the starch is carbonized into carbon. The mesoporous MoSe 2 /C composite is investigated as an anode material for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). It presents good storage capacity for both lithium ions and sodium ions . Under the current density of 200 mA g −1 , the mesoporous MoSe 2 /C composite exhibits reversible capacity of 618 mA h g −1 for LIBs and 360 mA h g −1 for SIBs after 300 cycles. The superior electrochemical performance could be ascribed to the mesoporous structure of MoSe 2 /C composite which provides sufficient space for accommodating huge volumetric expansion and the charge product, selenium.
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DOI
高影响因子
TALANTA
·
2016
·
IF 4.035
Na Bin,Weili Li,Xuehua Yin,Xiaohua Huang,Qingyun Cai
A novel electrochemiluminescence (ECL) aptasensor was proposed for ultrasensitive detection of cytochrome c (cyt c) using CdS:Mn quantum dot-modified TiO 2 nanowires (NWs) as electrode. The Mn-doped CdS was deposited on the TiO 2 NWs by successive ion layer adsorption and reaction (SILAR) as ECL emitter, on which thiol-modified aptamer of cyt c was attached via Cd–S bond. Due to the high photo-electrical transfer efficiency, the as-prepared aptasensor shows high selectivity and sensitivity towards cyt c with a detection limit of 9.5 fM and a linear range from 50 fM to 125 pM.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Junjie Jiang,Dingbang Yang,Yongsong Wang,Xiao Guo,Madoune Yassine,Wenqiang Huang,Tao Xu,Shanshan Wang,Han Huang,Fangping Ouyang,Yongli Gao
Identifying the crystallographic orientations and understanding the growth mechanism of MoO 2 nanocrystals are important for device applications. Here, we investigate the effect of precursor concentrations in chemical vapor deposition on the orientation of MoO 2 nanoflakes with respect to the substrate surface. X-ray diffraction, optical microscopy, (tilted) scanning electron microscopy, high resolution transmission electron microscopy, selected area electron diffraction, and angle-resolved polarized Raman spectroscopy were used to determine the crystal orientations of the nanoflakes and their epitaxial relationship with c- sapphire substrates: lying-down MoO 2 nanoflakes for MoO 2 (0 1 0)∥sapphire(0001) and MoO 2 <0 0 1>//sapphire< 1 1 ¯ 00 >, and standing-up ones for MoO 2 (1 0 0)∥sapphire(0001) and MoO 2 <0 0 1>∥sapphire< 1 1 ¯ 00 >. Tentative atomic epitaxial models are proposed to explain the orientation and alignment. The investigations also demonstrated that angle-resolved polarized Raman spectroscopy is a quick and nondestructive method to identify the crystallographic orientations of nanoflakes.
研究领域:
材料科学
·
纳米技术
·
晶体学
·
薄膜生长
·
拉曼光谱学
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DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Yanan Chen,Yuanbo Zhao,Weijun He,Yanan Liu,Hongna Xing,Xiuhong Zhu,Yanqun Guo,Juan Feng,Chunyan Liao,Yan Zong,Xinghua Li,Xinliang Zheng
Significant volume changes and slow ionic transport during charge/discharge processes restrict the improvement of electrochemical performance for Cu x S (x = 1–2). Herein, a new strategy by introducing Cu-BTC (copper(II)-benzene-1,3,5-tricarboxylate) as a processor to derive three-dimensional Cu 1.81 S@C using green sulfurization and calcination methods is proposed. Benefiting from the high electrical conductivity , multistage pore size structure and stable structure brought by the conductive carbon skeleton after calcination , Cu 1.81 S@C-650 o C exhibits a high specific capacitance of 291.1 F g -1 at a current density of 1 A g -1 and a superior rate capability of 83.6 % at a current density of 10 A g -1 . In addition, the assembled asymmetric supercapacitor (Cu 1.81 S@C-650 o C//AC ASC) also shows impressive performances, such as an energy density up to 16 Wh kg -1 at a power density of 352 W kg -1 and an excellent cycling stability of 93.1 % over 5000 cycles at a current density of 2 A g -1 . This work demonstrates that the Cu-BTC-derived Cu 1.81 S@C is an attractive material with potential applications in energy storage devices.
研究领域:
材料科学
·
能量存储
·
超级电容器
·
金属有机框架（MOFs）
·
纳米材料
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DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Di Wu,Yingguo Yang,Peng Zhu,Xiaoming Zheng,Xiaoliu Chen,Jiao Shi,Fei Song,Xingyu Gao,Xueao Zhang,Fangping Ouyang,Xiang Xiong,Yongli Gao,Han Huang
Molybdenum dioxide (MoO2) has attracted many interests due to its unique properties and potential applications. Here, we report the synthesis of high quality MoO2@MoS2 nanorods on c-sapphire substrates through an atmospheric pressure chemical vapor deposition (APCVD) approach. Optical microscopy (OM), cross-sectional scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and (grazing incidence) X-ray diffraction ((GI)XRD) measurements reveal that these MoO2 nanorods exhibit epitaxial growth behaviors on c-sapphire substrates with the orientation relationship of MoO2(100)∥sapphire(0001) and MoO2 ⟨001⟩ aligned well with sapphire ⟨101̅0⟩. Raman spectroscopy/imaging, energy dispersive spectroscopy (EDS), and GIXRD results disclose that such MoO2 nanorods are wrapped by MoS2 (MoO2@MoS2). Devices based on transferred individual MoO2@MoS2 nanorods show a resistivity of ∼1.65 × 10–4 Ω·cm, comfirming that such nanorods possess higher crystalline degree. Our findings will be helpful for the applications of MoO2@MoS2 in the fields of nanoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
凝聚态物理
·
电子器件
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jieting Ding,Shan Ji,Hui Wang,Vladimir Linkov,Hengjun Gai,Fusheng Liu,Quanbing Liu,Rongfang Wang
Water electrolysis offers a promising approach toward future sustainable energy mix utilizing hydrogen as energy carrier. Bifunctional catalyst which is active in both oxygen and hydrogen evolution reactions can significantly enhance total electrochemical water splitting efficiency and simplify electrolysis systems. In this study, nitrogen doped nickel-containing porous carbon networks were prepared to fulfill this role. Peptone was used as carbon and nitrogen source during the synthesis and NaCl presence as a template resulted in the formation of open mesopores interconnected by thin carbon sheets with nanosized Ni particles encapsulated in the carbon matrix. A low onset potential of 53 mV and a charge transfer resistance of 3.8 Ω with excellent cycling stability were demonstrated when the optimized catalyst Ni-2 was applied in HER. It was also shown that Ni-2 onset potential, charge transfer resistance, and durability in OER were comparable to those of a commercial RuO2 catalyst. During the electrolysis study conducted at 10 mA cm–2, Ni-2 maintained a cell voltage of 1.63 V with remarkable stability during 25 h operation.
研究领域:
电化学
·
材料科学
·
能量转换
·
催化
·
氢能
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DOI
高影响因子
BIOCATALYSIS AND BIOTRANSFORMATION
·
2016
·
IF 0.892
Yanmei Wei,Hui Luo,Yanhong Chang,Huimin Yu,Zhongyao Shen
In this study, a recombinant cephalosporin C acylase (CCA) was covalently or physically immobilized on an epoxy-activated support LX1000-EPC4 (EP) or its derivatives, EP-polyethyleneimine (EP-PEI) and EP-ethylenediamine (EP-EDA) with cationic groups on the surface. Zeta potential was used as a tool for activated carrier analysis and immobilization analysis. The EP-PEI (the cationic polymer PEI grafted support) showed higher zeta potential than EP-EDA (the small diamine EDA modified support) and EP support. Among these three supports, immobilization of CCA on EP-PEI had the highest specific activity according to the range of enzyme loadings. Michaelis constant Km values of EP-PEI-CCA and EP-EDA-CCA were 22 mM and 30 mM, respectively, which were lower than that of the free enzyme (43 mM), suggesting that the support’s zeta potential is related to the affinity of the enzyme for the substrate. The enzyme immobilized on EP-PEI showed a much higher thermal stability (stabilization factor of 32-fold compared with the free enzyme) than that on the EP-EDA (stabilization factor of 5.5-fold) and EP supports (stabilization factor of 1.7-fold). The adsorption of CCA on EP-PEI support was very strong and reversible. The CCA could be thoroughly desorbed using a high concentration of NaCl (e.g., 2 M) at low pH value (pH 3.0). The regenerated EP-PEI support could then be reused for enzyme immobilization.
研究领域:
酶工程
·
生物催化
·
蛋白质固定化
·
应用微生物学
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DOI
高影响因子
危险品化学品经营许可证（带存储）