Nano Research
·
2021
·Vol. 14
·期 7
·2241-2246
·
IF 8.897
Yang Mingming,Wang Longlong,Hu Guofeng,Chen Xue,Gong Peng Lai,Cong Xin,Liu Yi,Yang Yuanbo,Li Xiaoli,Zhao Xiaohui,Liu Xuelu
The interlayer coupling in van der Waals (vdW) heterostructures (vdWHs) is at the frontier of the fundamental research, underlying many optical behaviors. The graphene/MoS 2 vdWHs provide an ideal platform to reveal the good interfacial coupling between graphene and MoS 2 constituents. Here, three groups of graphene/MoS 2 vdWHs were prepared by transferring 1–3 layers of graphene onto monolayer MoS 2 . The interlayer coupling within graphene/MoS 2 vdWHs were characterized and analyzed by Raman spectroscopy, photoluminescence (PL) spectroscopy and optical contrast (OC) spectroscopy. The upshift of the A 1g peak of MoS 2 and the upshift of the D and 2D peaks of SLG show that the electrons move from MoS 2 to graphene accompanied by the dielectric shielding effect on graphene. The weakened PL intensities and the slight red shift of A peak prove that the electrons move from MoS 2 to graphene meanwhile the recombination of hole and electron pairs is blocked in vdWHs. Our results deepen the understanding of the interlayer coupling of graphene/MoS 2 vdWHs and therefore provide guidelines for the practical design and application of optoelectronic devices based on graphene/MoS 2 vdWHs.
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高影响因子
FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 4
·1177-1191
·
IF 2.2
Peng Hao,Song Xiaolan,Song Dan,Wang Yi,An Chongwei,Luo Chunwang
The nano-boron powder (n-B) exhibits remarkable efficacy as a combustion catalyst, making it a prime candidate for use in solid propellant metal burners. Nevertheless, throughout the storage phase, the surface of n-B powder is prone to oxidation and substantial agglomeration, resulting in challenges with ignition and incomplete energy dissipation when utilizing boron powder. The synthesis of nano-boron/nitrocellulose/ammonium dinitramide@fluorine rubber (n-B/NC/ADN@F 2602 ) is accomplished via the coaxial electrospinning technique, with n-B uniformly dispersed within the core–shell fiber. The n-B is evenly distributed within the core–shell fiber, and as a result of F 2602 encapsulation, the moisture absorption of n-B/NC/ADN@F 2602 has decreased from 191.6 to 10.1%. In the course of combustion, the fibrous composite of n-B/NC/ADN@F 2602 undergoes an escalation in the rates of energy output and energy release, owing to the constraints imposed by external F 2602 . The n-B/NC/ADN@F 2602 demonstrates a 1.3-fold rise in peak pressure and a 1.15-fold increase in maximum pressure rise rate compared to n-B/NC/ADN. Furthermore, the maximum flame temperature is elevated by 150.5 ℃, and the combustion heat is augmented by approximately 8.7%. The findings of the energy performance assessment reveal that the mean molecular weight (MC) of the combustion byproduct of n-B/NC/ADN@F 2602 stands at 27.6 g·mol −1 , markedly surpassing that of n-B/NC/ADN. The aforementioned findings exemplify that coaxial electrospinning is an exceedingly efficacious technique for enhancing nanostructures, thereby amplifying the reactivity of energetic particles and offering novel insights into their application in energetic materials.
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高影响因子
FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 2
·565-575
·
IF 2.2
Li NaiBing,Chen Jiaoyang,Li Jialiang,Wu Huanlin,Li Ziyin,He Xuemei,Cai Lu
In this paper, several novel cotton fabrics (named as PA-0-C, PA-5-C, PA-10-C and PA-15-C) decorated with multi-functions as robust hydrophobicity, self-cleaning and oil–water separation were rapidly fabricated by a eco-friendly dip-coating process, which does not require complex or time-consuming fabrication process. The exceptional water repellency and silver mirror phenomenon could be observed on the surface of synthesized cotton fabrics. Additionally, the effect of cross-linker contents on the washing durability and abrasion stability was fully studied. Results demonstrate that PA-10-C exhibits the best washing durability and abrasion stability. However, the films of PA-15-C are more likely to split away because of its hardness, resulting a sharp decrease of water contact angles from 144.7° to 125.1° after 25 washing cycles. On the other hand, the water contact angles of proposed cotton fabrics are still above 136° after immersing in acid–alkali solutions for 12 h, indicating satisfactory chemical stability. Thermal-gravimetric analysis confirms that the cross-linked polyacrylates can decelerate the thermal decomposition of cotton fabrics. Apart from this, the PA-15-C sample possesses the superior self-cleaning property and outstanding selective absorption of dichloromethane under the water. Overall, the newly fabricated cotton fabrics could be reasonably expected to have widespread applications.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 3
·1-10
·
IF 2.6
You Pingfeng,Zhang Ping,Chen Pengfei,Xie Ruishi,Chen Lin,Xiong Ying
With the rapid development of society, polymer materials are widely used in automotive, construction, and electronic components due to their excellent properties such as easy processing, cheap price, and corrosion resistance. However, most polymers, such as rubber and leather, suffer from poor mechanical properties, susceptibility to micro cracking and flammability. In this paper, an epoxidized natural rubber (ENR)/polylactic acid (PLA)/chitosan (CS)/guanidine phosphate (GP) composites with certain self-healing and flame-retardant properties are successfully prepared. The network structure is constructed by forming thermoplastic elastomers (TVPs) through ENR and PLA, and the amino groups on CS and GP can form hydrogen bonds with ENR, which improves the mechanical properties of ENR/PLA composites and gives the ENR/PLA/CS/GP composites excellent self-healing properties. Meanwhile, CS and GP can also form intumescent flame retardants to improve the flame-retardant properties of ENR/PLA composites. The results show that the mechanical strength of ENR/ PLA /CS/GP composites can reach 4.2 MPa when the addition of CS and GP is 2phr and 4phr, respectively. The self-healing effectiveness of the ENR/PLA/CS/GP composite reaches up to 78% after 3 h at 130 °C. The stress intensity of the original ENR/PLA composite is 3.4Mpa, and that of healing ENR/PLA/CS/GP composite is 3.3Mpa. Meanwhile, the peak heat release rate (HRR) of ENR/PLA could decease 35.8% owing to 2phr CS and 4phr GP.
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高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 3
·788-795
·
IF 6.8
Song Dewen,Zhang Shipeng,Ning Hui,Fei Xiang,Wang Mingwang,Wang Xiaoshan,Wu Wenting,Zhao Qingshan,Li Yongzhe,Wu Mingbo
CO 2 electroreduction is an alluring technology for high-value CO 2 utilization and intermittent electrical energy storage. Self-supporting catalysts with high efficiency have clear advantages over powder ones in electrode construction but still lack effective synthesis methods. In this work, a self-supporting BiCu/carbon hybrid nanofiber membrane (BiCu/CHNM) was synthesized by electrospinning-calcination and employed directly as a working electrode in a flow cell for CO 2 electroreduction to formate with a high Faradaic efficiency of 87.67% at a partial current density of 142.9 mA cm −2 . In stability tests, the Faradaic efficiency of formate remained at 80% for 50 h at high partial current densities (>100 mA cm −2 ). In-situ Raman spectra and density functional theory calculations confirmed that copper doping lowers the energy barrier of HCOO − formation on the Bi (012) plane and increases the conductivity of the carbon nanofiber network. Due to the well-designed conductive framework and the highly dispersed BiCu active sites, this hybrid membrane shows high activity, high selectivity, and long stability simultaneously.
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高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·4753-4763
·
IF 9.5
Yin Leilei,Zhang Shuai,Sun Mingzi,Wang Siyuan,Huang Bolong,Du Yaping
Currently, dual atomic catalysts (DACs) with neighboring active sites for oxygen reduction reaction (ORR) still meet lots of challenges in the synthesis, especially the construction of atomic pairs of elements from different blocks of the periodic table. Herein, a “rare earth (Ce)-metalloid (Se)” non-bonding heteronuclear diatomic electrocatalyst has been constructed for ORR by rational coordination and carbon support defect engineering. Encouraging, the optimized Ce−Se diatomic catalysts (Ce−Se DAs/NC) displayed a half-wave potential of 0.886 V vs. reversible hydrogen electrode (RHE) and excellent stability, which surpass those of separate Ce or Se single atoms and most single/dual atomic catalysts ever reported. In addition, a primary zinc-air battery constructed using Ce−Se DAs/NC delivers a higher peak power density (209.2 mW·cm −2 ) and specific capacity (786.4 mAh·g Zn −1 ) than state-of-the-art noble metal catalysts Pt/C. Theoretical calculations reveal that the Ce−Se DAs/NC has improved the electroactivity of the Ce−N 4 region due to the electron transfer towards the nearby Se specific activity (SA) sites. Meanwhile, the more electron-rich Se sites promote the adsorptions of key intermediates, which results in the optimal performances of ORR on Ce−Se DAs/NC. This work provides new perspectives on electronic structure modulations via non-bonded long-range coordination micro-environment engineering in DACs for efficient electrocatalysis.
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高影响因子
RARE METALS
·
2024
·Vol. 43
·期 5
·2026-2038
·
IF 9.6
Xu Bin,Jia Lu,Yang Hui,Wang Yue,Fan Si-Yu,Yuan Sai-Sai,Zhang Qi-Tao,Zhang Ming,Ohno Teruhisa
In this study, the truncated octahedral CeO 2 (CeO 2 -to) with special morphology was prepared by the solvothermal method with oleic acid (OA) and oleamine (OM) as the morphology-directing agents. High-resolution transmission electron microscopy (HRTEM) results show that CeO 2 -to exposes composite {100} and {111} facets, while CeO 2 cubic (CeO 2 -c) and CeO 2 octahedral (CeO 2 -o) only expose single crystal facets of {100} plane and {111} plane, respectively. Interestingly, this CeO 2 -to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde (CH 3 CHO) degradation, in which CO 2 generation value reaches 1.78 and 7.97-times greater than that of CeO 2 -c and CeO 2 -o, respectively. In addition, the active species trapping experiment signifies that superoxide (·O 2 − ) and holes (h + ) are the main reactive substances during the CH 3 CHO degradation process, and the electron paramagnetic resonance (EPR) spectra indicates that the former is the major contributor. Notably, the electron transfer mechanism between CeO 2 -to {100} and {111} facets and the surface oxygen adsorption ability are revealed via density functional theory (DFT) calculations. It is also confirmed that {100} facets are more conducive to the absorption of acetaldehyde than {111} facets. Finally, a reasonable mechanism for improved photocatalytic CH 3 CHO degradation on CeO 2 -to is proposed based on relevant experiments and DFT calculations. This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds (VOCs). It also offers additional direction for optimizing the photocatalytic activity of other cerium-based photocatalysts. Graphical abstract
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·1-8
·
IF 2.7
Wang Dongyang,Zou Wenhua,Chen Yexin,Duan Junhong
In this work, different percentages of Eu-doped TiO 2 nanoparticles were synthesized by sol–gel method. The bandgap and conduction band minimum (CBM) of TiO 2 nanoparticles doped by 0.075 at% Eu element is reduced from 3.43 and – 3.93 eV to 3.09 and – 4.25 eV, respectively, deduced from the results of ultraviolet–visible (UV–Vis) absorption spectroscopy and ultraviolet photoelectron spectroscopy (UPS) measurement compared with un-doped TiO 2 . As the increase of Eu concentration, short-circuit photocurrent density J sc of CdSe quantum dot-sensitized solar cells (QDSCs) increases from 10.86 to 13.86 mA/cm 2 , while open-circuit voltage V oc is almost invariable. Optimal power conversion efficiency (PCE) of 4.03% is achieved for CdSe QDSCs with 0.075 at% Eu-doped TiO 2 film. Compared with un-doped devices, the decrease of the chemical capacitance C μ and the increase of recombination resistance R rec of QDSCs based on the 0.075 at% Eu-doped TiO 2 photoanodes can facilitate charge extraction and suppress charge recombination at the TiO 2 /electrolyte interface.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 10
·28227-28237
·
IF 5.19
Liu Huan-Huan,Yang Lei,Guo Lin-Kai,Tu Li-Xin,Li Xiao-Tong,Wang Jia,Ren Yong-Xiang
The occurrence of metal oxide nanoparticles (NPs) in wastewater treatment plants (WWTPs) has raised great concerns about their adverse impacts on nitrification performance. In this study, a heterotrophic nitrifying bacterium Pseudomonas putida strain NP5 showed strong resistance against TiO 2 and NiO NPs. Under 5–50 mg/L NP stress, cell viability was still normal, and the final nutrient removal rates, always higher than 80%, were slightly inhibited. Correspondingly, the PO 4 3− -P removal rates were almost the same as those observed in the control test. Although the enzyme assay demonstrated ammonia monooxygenase and hydroxylamine oxidoreductase activities markedly decreased caused by increased reactive oxygen species (ROS) level under 50 mg/L NPs stress. The total antioxidant capability of NP5 could eliminate excess ROS to maintain a balance between oxidants and antioxidants. Besides, in response to the escalating burden of NPs, strain NP5 tended to secrete more extracellular polymeric substances (EPS), which could protect cell from being damaged by binding to ions and coating. Thus, the strong NP resistance of NP5 would help to overcome the vulnerability of the nitrification process in WWTPs.
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高影响因子
Science China-Information Sciences
·
2019
·Vol. 62
·期 12
·1-8
·
IF 2.731
Wang Tao,Shi Xinyao,Wang Jin,Xu Yijun,Chen Jie,Dong Zhuo,Jiang Man,Ma Pengfei,Su Rongtao,Ma Yanxing,Wu Jian,Zhang Kai,Zhou Pu
Vanadium diselenide (VSe 2 ), a typical metallic behaviour material among transition metal dichalcogenides (TMDCs) family, exhibits excellent photoelectric characteristics with a zero band gap, missing applicaiotn in pulse generation. In this work, a high-quality VSe 2 saturable absorber (SA) was synthesized through a liquid-phase exfoliation method. The saturable absorption of obtained VSe 2 -SA was characterized systematically. The measured modulation depth was 9.9%, and the saturated intensity was 533.8 µJ/cm 2 . By incorporating this optical modulator into a ytterbium-doped fiber laser cavity, a stable passively Q-switched laser could be achieved. The pulse had the central wavelength of 1064.03 nm. As the pump power was increased, the repetition rate increased from 24.3 kHz to 35.6 kHz, and the pulse duration decreased from 7.21 µs to 5.27 µs. The output power had the maximum value of 28.55 mW. These results indicated that VSe 2 is an effective candidate to generate pulse laser due to its excellent nonlinear optical properties and universal photoelectric response, which may advance the applications of VSe 2 -based nonlinear optics and photoelectric devices.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 5
·1711-1720
·
IF 2.8
Zhu Min-dan,Zhu Hua-li,Guo Jin-mei,Lu Chao-cao,Ji Yan,Hu Jin,Tan Xin-xin,Chen Zhao-yong
High-nickel cathode material has high specific capacity, but the rapid capacity decay restricts its application. Hereby, three conductive oxides including nano-antimony tin oxide (Sb 2 SnO 5 , ATO), zinc stannate (Zn 2 SnO 4 , ZTO), and antimony-doped zinc stannate (Sb-doped ZTO, AZTO) with high mobility and low resistivity were used as coating materials separately to improve the rate capability and cycling stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811). The conductive oxide was uniformly coated on the surface of NCM811 with the thickness of about 4 nm. The AZTO-coated NCM811 shows the superior rate capability with the initial discharge capacities of 201.35, 197.86, 190.80, and 182.31 mAh g −1 at 0.1, 0.2, 0.5, and 1 C, respectively. The ZTO-coated NCM811 has the best cycling stability with the capacity retention of 85.93% after 100 cycles, while that of the pristine NCM811 is 66.75%. The conductive oxides improve the electronic/ionic conductivity and block the reaction between cathode material and electrolyte, reduce the electrochemical impedance and the side reaction, and further increase the rate capability and the reversibility of the materials.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 15
·12824-12829
·
IF 2.324
Ruan Chengzhi,Tao Jiahua,Zhu Chengyun,Chen Chen
In this work, potassium-containing Cu 2 SnS 3 thin films (K x Cu 2−x SnS 3 ) were fabricated by a simple and low-cost ultrasonic spray pyrolysis method on glass substrates with different potassium doping concentration. Effects of various potassium concentrations on the structural, morphological and optical properties of the films were systematically investigated. The results indicate that potassium doping can well enhance the growth of particle size and decrease the band gap of the film from to 1.55 to 1.26 eV. Solar cell devices with a structure of glass/FTO/K 2−x Cu 2 SnS 3 /CdS/ZnO/AZO have been prepared and obvious solar cell device performance improvement has been observed by 2 at% potassium doping. This potassium-containing Cu 2 SnS 3 thin films could be a promising absorber material for high efficiency solar cell.
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高影响因子
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