Nanomaterials
·
2025
·Vol. 16
·期 1
·
IF 4.3
Yu Zhang,Ying Xin,Lizheng Tang,Shihao Cui,Hongling Duan,Qingshan Zhao
The selective hydrogenation of phenol to cyclohexanone is a pivotal reaction for producing nylon precursors. Conventional Pd/C catalysts, however, suffer from weak metal–support interactions, leading to size heterogeneity and agglomeration of Pd nanoparticles, which degrades their activity and stability. Herein, we report a facile argon plasma treatment to engineer rich defects on an activated carbon (AC) support, resulting in a highly dispersed and stable catalyst (denoted as PL-Pd@ACAr). Characterization results indicate that the abundant carbon defects in PL-Pd@ACArenhance the anchoring of Pd precursors, ensure the uniform dispersion of Pd nanoparticles, and effectively modulate their electronic structure. Consequently, the plasma-enabled PL-Pd@ACArcatalyst achieves 99.9% phenol conversion with 97% selectivity to cyclohexanone at a mild temperature of 70 °C and maintains exceptional stability over six consecutive cycles. This work provides a robust and efficient strategy for the surface engineering of carbon supports to design high-performance hydrogenation catalysts.
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产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 20
·2107650
·
IF 15.153
Yin Xia,Lingyi Zong,Yu Pan,Xinyu Chen,Lihui Zhou,Yiwen Song,Ling Tong,Xiaojiao Guo,Jingyi Ma,Saifei Gou,Zihan Xu,Sheng Dai,David Wei Zhang,Peng Zhou,Yu Ye,Wenzhong Bao
Two-dimentional semiconductors have shown potential applications in multi-bridge channel field-effect transistors (MBC-FETs) and complementary field-effect transistors (C-FETs) due to their atomic thickness, stackability, and excellent electrical properties. However, the exploration of MBC-FET and C-FET based on large-scale 2D semiconductors is still lacking. Here, based on a reliable vertical stacking of wafer-scale 2D semiconductors, large-scale MBC-FETs and C-FETs using n-type MoS 2 and p-type MoTe 2 are successfully fabricated. The drive current of an MBC-FET with two layers of MoS 2 channel (20 µm/10 µm) is up to 60 µA under 1 V bias. Compared with the single-gate MoS 2 FET, the carrier mobility of MBC-FET is 2.3 times higher and the sub-threshold swing is 70% smaller. Furthermore, NAND and NOR logic circuits are also constructed based on two vertically stacked MoS 2 channels. Then, C-FET arrays are fabricated by 3D integrating n-type MoS 2 FET and p-type MoTe 2 FET, which exhibit a voltage gain of 7 V/V when V DD = 4 V. In addition, this C-FET device can directly convert light signals to an electrical digital signal within a single device. The demonstration of MBC-FET and C-FET based on large-scale 2D semiconductors will promote the application of 2D semiconductors in next-generation circuits.
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DOI
高影响因子
POWDER METALLURGY
·
2024
·
IF 1.9
Xiao-Chun Deng,Guo-Hua Zhang
The WC-10Co cemented carbides containing (ZrHfNbTaTiMo)C high-entropy carbide with satisfactory comprehensive mechanical properties were successfully manufactured by conventional vacuum sintering. The influences of (ZrHfNbTaTiMo)C contents (0, 0.5, 1, 5, 10 wt.%) on the densification degree, microstructure, grain size and mechanical properties were investigated. The results showed that the addition of (ZrHfNbTaTiMo)C deteriorated the wettability between Co and WC, leading to a decline in relative density. (ZrHfNbTaTiMo)C inhibited the growth of WC grains, and the average grain size of WC continued to decrease with the increase of (ZrHfNbTaTiMo)C content. After adding (ZrHfNbTaTiMo)C, the hardness and toughness rose first and then descended. When the content of (ZrHfNbTaTiMo)C was 1 wt.%, the hardness and toughness reached the maximum value of 16.77 GPa and 10.45 MPa·m1/2, respectively. Moreover, the structure was a dual-grain structure, with many high-aspect-ratio rectangular grains in the sintered samples added by 0.5 wt.% and 1 wt.% (ZrHfNbTaTiMo)C. This special structure not only enhanced the hardness, but also compensated the loss of toughness. After doping 0.5 wt.% CeO2, the hardness decreased slightly, while the toughness increased to 12.42%.
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DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Zhichao Yu,Xin Liu,Yang Liu,Yuan Li,Zhuohan Zhang,Kangli Chen,Shumin Han
Multiple catalysts have exhibited high activity on improving the hydrogen storage performance of MgH 2 . Herein, the hydrogen ab/desorption kinetics of MgH 2 is significantly improved by using Ni@C@CeO 2 as the catalyst. The results show that 10 wt%-Ni@C@CeO 2 doped MgH 2 can absorb 4.51 wt% hydrogen within 60 min under low temperature 75 °C. Furthermore, the MgH 2 -Ni@C@CeO 2 composites release approximately 4.88 wt% H 2 within 10 min at 325 °C. Moreover, the composites show excellent cycling performance, with negligible decrease in hydrogen storage capacity, hydrogen uptake rate and hydrogen release rate after ten cycles at 350 °C. The Rietveld refinement of X-ray diffraction and transmittance electron microscopy measurements reveal that Mg 2 NiH 4 /Mg 2 Ni and CeH 2.73 phases are in-situ formed. The mutual conversion of “Mg 2 Ni/Mg 2 NiH 4 ” during hydrogen ab/desorption is a well-known “hydrogen pump” effect, which improvs the hydrogen storage performance of MgH 2 . The presence of CeH 2.73 accelerate the conversion of Mg 2 Ni/Mg 2 NiH 4 , which we call ‘facilitated hydrogen pump’ effect. This attempt paves a potential way to achieve high performance Mg-based composites hydrogen storage materials via collaborative action between Ni and Ce species.
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DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2024
·Vol. 18
·期 4
·2300346
·
IF 2.5
Dingbang Yang,Xiao Guo,Junjie Jiang,Yongsong Wang,Yuedong Wang,Jindong Bai,Haipeng Xie,Jin Li,Fangping Ouyang,Han Huang
Interfacial interactions, including interfacial charge transfer and strain, play important roles in the applications of 2D layered materials. Recently, MoO 2 have been widely used as precursors or substrates for growth of high-quality MoS 2 . Herein, photoluminescence (PL) and Raman spectroscopy are used to investigate the dependence of epitaxial monolayer MoS 2 PL properties on MoO 2 nanoflakes in different thicknesses on c-sapphire. On all MoO 2 nanoflakes, the trion exciton of MoS 2 disappears due to the interfacial charge transfer from MoS 2 to MoO 2 . The neutral exciton of MoS 2 exhibits a ≈60 meV redshift on thick MoO 2 nanoflakes compared to those either on c-sapphire or on thin MoO 2 nanoflakes, which is attributed to the relaxation of c-sapphire-induced compressive strain in MoO 2 over a critical thickness. Temperature-dependent PL measurements reveal a stronger electron–phonon interaction in MoS 2 on MoO 2 than on c-sapphire. The findings provide an easy way to tune the properties of MoS 2 via tuning the thickness of MoO 2 buffer layer on c-sapphire.
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DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2012
·Vol. 26
·期 7
·719-727
·
IF 2.79
Yingzhi Liu,Bo Su,Xian Wang
RATIONALE The study of interactions between protein and pharmaceutical molecules including natural extracts has become of increasing interest in biological and biomedical research. An investigation of the interaction between saikosaponins and cytochrome c (Cyt c) by electrospray ionization mass spectrometry (ESI-MS) is described in this study. Saikosaponins are found in Bupleurum falcatum (a flowering plant), and they are glycosides that consist of saccharides and the sapogenins of triterpenoids. METHODS Seven model molecules of saccharides and triterpenes, namely maltose (Mal II), maltotriose (Mal III), raffinose (Raf), and stachyose (Sta), glycyrrhetinic acid (Gly), ursolic acid (Urs) and oleanic acid (Ole), were chosen to perform a series of ESI-MS control experiments for the exploration of the interaction groups in saikosaponins with Cyt c. The dissociation constants of detected noncovalent complexes were determined by using a direct ESI-MS assay. RESULTS We have observed in the ESI mass spectra the formation of Cyt c complexes with saikosaponins a and c, and these saccharides, with 1:1 and 1:2 stoichiometry. Our results showed that no complex ions of triterpenes and Cyt c were detected in the ESI-MS and similar Kd values were obtained for the Cyt c complexes of saikosaponins and saccharides. This demonstrates that the glycosyl moiety in the saikosaponins is the effective interaction group with Cyt c. We propose that saikosaponins and saccharides interact with Cyt c by hydrogen bonds. The binding affinity of these six ligands with Cyt c is shown to be in the order Ssa > Ssc > Raf, Mal III > Sta ≥ Mal II. CONCLUSIONS The ESI-MS methodology presented in this study enables us to investigate the interactions of saikosaponins with Cyt c, and allows the direct determination of binding constants. These results could guide further research for providing insights into the structure-binding relationship of ligands with Cyt c. Copyright © 2012 John Wiley & Sons, Ltd.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Chuanxu Hou,Junye Cheng,Huibin Zhang,Ziheng Lu,Xiuying Yang,Guangping Zheng,Deqing Zhang,Maosheng Cao
With the continuous advances in detection and early-warning technologies, stealth technologies have widely integrated in modern combat systems and armament research. The development of high-performance electromagnetic wave absorbing materials is important for electromagnetic stealth and shielding applications. Herein, biomass-derived carbon (BDC) from glucose is coated on the surface of folded and stacked WS 2 nanosheets, forming WS 2 @BDC via a simple hydrothermal method and subsequent annealing carbonization. The amount of the BDC coating on the WS 2 nanosheets is effectively controlled by the glucose solution concentration, and the electromagnetic wave (EMW) absorption performance in the low-frequency bands can be adjusted by the regulation of annealing temperature. The effective absorption band of WS 2 @BDC is shifted to a lower frequency region and the absorption performance is substantially enhanced, compared to those of pure WS 2 nanosheets. The minimum reflection loss of WS 2 @BDC corresponding to 14 mL of glucose and a carbonization temperature of 800 °C can reach up to −51.40 dB at 5.52 GHz. The study provides a novel and facile method for improving the EMW absorption performance of WS 2 in the low-frequency bands.
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DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 35
·期 6
·065704
·
IF 3.5
Xiaomei Yu,Wei Shi,Jiajiao Wei,Tiantian Liu,Yuanyuan Li,Mengyuan He,Zhengyu Wei,Dehai Ping,Panfei Sun,Jin You Zheng,Songjie Li
Developing non-noble-metal electrocatalysts for hydrogen evolution reactions with high activity and stability is the key issue in green hydrogen generation based on electrolytic water splitting. It has been recognized that the stacking of large CoP particles limits the intrinsic activity of as-synthesized CoP catalyst for hydrogen evolution reaction. In the present study, N-MoxC/CoP-0.5 with excellent electrocatalytic activity for hydrogen evolution reaction was prepared using N-MoxC as decoration. A reasonable overpotential of 106 mV (at 10 mA cm−2) and a Tafel slope of 59 mV dec−1 in 1.0 M KOH solution was achieved with N-MoxC/CoP-0.5 electrocatalyst, which exhibits superior activity even after working for 37 h. Uniformly distributed ultrafine nanoclusters of the N-MoxC/CoP-0.5 hybrids could provide sufficient interfaces for enhanced charge transfer. The effective capacity of the hydrogen evolution reaction could be preserved in the complex, and the enlarged electrocatalytic surface area could be expected to offer more active sites for the reaction.
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DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 45
·8697-8702
·
IF 4.034
Xiaolin Wu,Jiang-Long Wang,Hongrui Zhang,Shufang Wang,Shengjun Zhai,Yaguang Li,Dogheche Elhadj,Guangsheng Fu
c-axis oriented Bi1−xPbxCuSeO (0 ≤ x ≤ 0.8) single crystalline thin films have been successfully epitaxially grown on SrTiO3 (001) substrates via the pulsed laser deposition technique. Detailed X-ray diffraction and transmission electron microscopy measurements reveal the excellent c-axis and ab-plane texture of the films. As the Pb doping concentration increases, both the resistivity and the Seebeck coefficient decrease due to the increase in hole carrier concentration. The highest power factor of about 1.2 mW m−1 K−2 has been achieved in Bi0.96Pb0.06CuSeO single crystalline thin films at 673 K, which is much higher than those of polycrystalline ceramics with random orientation, suggesting that c-axis oriented BiCuSeO-based single crystalline thin films might have great potential for application in thermoelectric thin film devices.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 1
·e20151
·
IF 3.5
Zhitong Xu,Jian Zhao,Malin Liu,Zebing Liu,Xinyu Cheng,Jiaxing Chang,Xu Yang,Bowen Li,Bing Liu,Rongzheng Liu
Developing high strength and tough silicon carbide (SiC) composite ceramics remains a significant challenge. Here, we report the process of synthesizing fully densified SiC/C composite ceramics using SiC@graphene (SiC@G) core–shell nanoparticles as raw materials through spark plasma sintering (SPS) at 1700°C and 45 MPa. The SiC@G nanoparticles were synthesized by the fluidized bed chemical vapor deposition (FB-CVD) method. During the sintering process, graphene coated, the surface of nanosized SiC particles exhibited high electrical and thermal conductivity, facilitating the uniform distribution of pulse current and heat and promoting the densification of SiC/C composite ceramics. For the prepared SiC/C composite ceramic, the carbon content reaches as high as 14.3 wt%, with carbon uniformly dispersed in a particulate form within the SiC matrix and stable interface bonding. Consequently, the introduction of excessive carbon does not compromise the hardness (28.8 GPa) and flexural strength (517.34 MPa) of the SiC/C composite ceramics. Furthermore, the carbon particles effectively enhance the toughness of the SiC/C composite material through mechanisms such as crack branching, bridging, and deflection, resulting in a fracture toughness of 7.38 MPa m 1/2 . The preparation strategy in this study provides a novel route for sintering SiC composites with high-carbon content through nanoscale powder structure design, resulting in the attainment of high-performance lightweight composite materials.
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2014
·Vol. 28
·期 9
·673-677
·
IF 2.017
Limin Ren,Wenyi Chu,Dinghui Guan,Yanjun Hou,Man Wang,Xiaobin Yuan,Zhizhong Sun
A simple and efficient route for the preparation of terphenyl derivatives via palladium-catalyzed sequential directed C―H arylation/Suzuki–Miyaura cross-coupling in ‘one-pot’ has been developed. 4,4′-(Cyclohexane-1,1-diyl)diphenol is an essential ligand. This reaction can tolerate a series of functional groups and provides the terphenyl derivatives in moderate to good yield. Copyright © 2014 John Wiley & Sons, Ltd.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yingqiao Jiang,Gang Cheng,Yuehua Li,Zhangxing He,Jing Zhu,Wei Meng,Lei Dai,Ling Wang
The application of metal oxide is limited due to low conductivity, weak combination, poor dispersion, and hard nanocrystallization in vanadium redox flow battery. Herein, metal–organic framework (MOF) was firstly employed to prepare metal oxide and porous carbon nanocomposite, which was used to ultra-uniformly decorate graphite felt by in-situ growth. Graphite felt was modified with UiO-66 (Zr-MOF) nanoparticle using hydrothermal synthesis followed by conversion into porous nanocomposite (ZrO 2 @C) via high-temperature carbonization. ZrO 2 @C owns large surface area, regular arrangement of ZrO 2 , and high conductivity, which provides large reaction place, high active site density, and rapid electron transfer for redox reaction. Therefore, ZrO 2 @C can boost the electrochemical performance of graphite felt for VO 2+ /VO 2 + and V 3+ /V 2+ reactions by promoting diffusion, charge transfer, and electron transport, systematically. The modified flow cell using ZrO 2 @C/GF has better stability and higher utilization of electrolyte than pristine cell during 500-cycle test. ZrO 2 @C/GF decreases electrochemical polarization of cell at different current densities. At 200 mA cm −2 , voltage efficiency (77.5%) and energy efficiency (75.2%) of modified cell increase by 14.6% and 13.9% respectively compared with pristine cell. The modified cell can operate at a high current density up to 300 mA cm −2 and shows a 62.4% of energy efficiency. The cell performance in this study is superior to that reported in previous metal oxide-related works. This work presents a design allowing MOF-derived catalyst with nano size, high conductivity, good adhesion, and uniform dispersion, simultaneously.
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DOI
高影响因子
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