查找使用阿拉丁产品的科研文献

Enhancing charge density and steering charge unidirectional flow in 2D non-metallic semiconductor-CNTs-metal coupled photocatalyst for solar energy conversion

Xiaojie She,Jingjie Wu,Hui Xu,Zhao Mo,Jiabiao Lian,Yanhua Song,Liang Liu,Daolin Du,Huaming Li

The effective separation of the electron and hole (e-h) pairs plays a key role in enhancing the photocatalytic performance of the semiconductors. The density of electrons participating in the reduction reaction also determines photocatalytic performance. We report here a rational design of a photocatalyst assembly composed of n-type semiconducting two-dimensional g-C 3 N 4 nanosheets (2D-C 3 N 4 ), carbon nanotubes (CNTs), and plasmonic Ag nanocubes, which exhibits enhanced density of electrons and controlled unidirectional change flow to promote the photocatalytic hydrogen evolution reaction. Plasmonic Ag nanocubes inject the hot-electrons into conduction band of 2D-C 3 N 4 to increase the density of electrons while the CNTs act as a power pump of the electrons to steer electron flow from the conduction band of 2D-C 3 N 4 to reactants. The photocatalytic performance of Ag/2D-C 3 N 4 /CNTs assembly was dramatically enhanced for the H 2 evolution from water. The enhanced photocatalytic activity is due to the efficient unidirectional transfer of the electrons with high density and efficient separation of the e-h pairs.

Covalently Interconnected BN/CNTs Hybrid Networks Enhance the Thermal Conductivity and Electrical Insulation of Phase Change Composites for Advanced Thermal Management

Donghao Fan,Minyan Zhao,Shuai Yin,Xiaotian Peng,Guangtai Zhang,Hao Peng

Achieving efficient thermal management in high-power and flexible electronic devices remains a major challenge, particularly in the development of polymer-based phase change materials (PPCMs). Here, we report a PPCMs constructed by embedding covalently bonded boron nitride/carbon nanotubes (BN/CNTs) hybrids into a paraffin wax/ polydimethylsiloxane (PW/PDMS) matrix, which is called PW/PDMS@BN/CNTs (PPBC). The hybrids were synthesized through dopamine-assisted polymerization and amidation between amino-functionalized BN and carboxylated CNTs, forming continuous, chemically connected heat transfer networks. Structural analyses confirm stable amide linkages and homogeneous dispersion of fillers. The optimized PPBC exhibits a maximum thermal conductivity of 5.92 W·m −1 ·K −1 and a maximum latent heat of 92.5 J·g −1 . It also shows excellent cycling stability and leakage resistance with < 2% mass loss after 100 cycles. Thermal management tests reveal that PPBC coatings reduce operating temperatures of lithium-ion batteries and light-emitting diode (LED) chips by 10°C–30°C, achieving uniform heat dissipation and long-term reliability. In active modes, PPBC films deliver solar-thermal and electro-thermal conversion efficiencies exceeding 80%, remaining stable over 50 cycles. This work offers a generalizable strategy for designing flexible, high-performance, and electrically insulating PPCMs for advanced thermal management applications.

Synthesis of in situ grown CNTs on MOF-derived Ni@CNT with tailorable microstructures toward regulation of electromagnetic wave absorption performance

Jun Weng,Yanan Liu,Xiaoxiao Huang

Metal-Organic framework (MOF) derivatives have been applied as electromagnetic wave absorption (EMA) materials in recent years. Carbon nanotubes (CNTs) can achieve in situ growth on the surface of MOF derivatives. However, there is limited research on the EMA performance by regulating the morphology of the in situ grown CNTs. In this work, we prepared MOF-derived Ni@carbon nanotubes (Ni@CNT) with controllable length of CNTs by solvothermal and simple one-step pyrolysis method and revealed the CNT growth mechanism. We further investigated the effect of in situ grown CNT morphology on electromagnetic parameters and EMA performance. In situ grown CNTs of similar length on the surface of MOF derivatives lead to similar electromagnetic parameters. When the length of CNTs is short, the relaxation strength ( Δ ε = ε s − ε ∞ ) is high, leading to excellent microwave absorption performance. For Ni@CNT-600, the reflection loss of −44.4 dB can be achieved at merely 1.72 mm. Finite element (FE) simulation was used to evaluate the EMA mechanism of different samples by calculating electric field and polarization strength. This work has explored the electromagnetic wave absorption performance from the perspective of microstructural tailoring, helpful for understanding the unique role of the in situ grown CNTs on the surface of MOF derivatives and investigating the ultra-thin electromagnetic wave absorption materials.

Nitrogen-Doped Mesoporous Carbon Layer with Embedded Co/CoOx Nanoparticles Coated on CNTs for Oxygen Reduction Reaction in Zn–Air Battery

Chen Xiaowen,Wang Si,Wang Yan,Yang Zheng,Liu Sa,Gao Jingxia,Su Ziqian,Zhu Ping,Zhao Xinsheng,Wang Guoxiang

One-dimension (1D) heteroatom-doped mesoporous carbon is a promising alternative catalyst for oxygen reduction reaction (ORR). This work reported a hybrid ORR electrocatalyst composed of Co/CoO x nanoparticles embedded in N-doped mesoporous carbon layer coated on carbon nanotubes (CNTs@Co–N–C). Owing to the 1D mesoporous architecture with abundant active sites, CNTs@Co–N–C hybrid showed superior ORR activity, high selectivity, and long-term durability. Moreover, as cathode catalyst for primary Zn–air battery, CNTs@Co–N–C also showed excellent performance comparable to Pt/C. Thus, this study can offer a good idea for preparing noble-metal-free electrocatalysts for energy applications. A 1D hybrid electrocatalyst composed of Co/CoO x nanoparticles embedded in N-doped mesoporous carbon layer coated on carbon nanotubes (CNTs@Co–N–C) was prepared for efficient ORR.

Designing hierarchical D-SiOx@NC/C@CNTs/rGO composites via thermal disproportionation and interfacial reconstruction for high-performance lithium-ion batteries

Bowen Li,Haidong Xie,Hui Tian,Haojie Xu,Kaiyi Chang,Li Zhang,Chang Li,Jiao Hou,Xinwei Wang,Beiping Wang,Hui Lu,Shaolin Yang,Chunping Hou

Silicon suboxides (SiO x ) are promising anodes for lithium-ion batteries, but their practical application is hindered by severe volume fluctuation and sluggish (de)lithiation kinetics. Herein, a hierarchical disproportionated-SiO x -based composite, D-SiO x @NC/C@CNTs/rGO-2, consisting of disproportionated SiO x (D-SiO x ) with in situ generated Si/SiO 2 domains, a nitrogen-doped carbon/carbon (NC/C) interphase, and an interconnected CNTs/rGO conductive framework, is constructed through thermal disproportionation, interphase engineering, and multidimensional conductive-network design. Thermal disproportionation induces the in situ formation of Si domains embedded in a SiO 2 buffering matrix, in which Si provides lithium-storage activity while SiO 2 alleviates volume variation and enhances structural stability. Meanwhile, a conformal nitrogen-doped carbon interphase mitigates chemo-mechanical stress and stabilizes the active interface, and the intertwined CNTs/rGO framework builds an efficient conductive network. As a result, the optimized anode delivers a reversible capacity of 876.4 mAh·g −1 after 500 cycles at 0.5 A g −1 , with a capacity retention of 83.7%, while electrode swelling is suppressed to ≈52% versus ≈159% for bare D-SiO x . Operando electrochemical impedance spectroscopy combined with distribution of relaxation times reveals reduced interfacial polarization and faster apparent Li  +  transport. A pre-lithiated LFP||D-SiO x @NC/C@CNTs/rGO-2 full cell also shows an initial Coulombic efficiency of 96.15% and stable cycling over 200 cycles.

A novel hybrid hyperbranched nanowire CNTs for enhancing oil recovery through increasing viscoelasticity and high-viscous emulsions to compensate reservoir heterogeneity

Rui Gou,WanFen Pu,Rui Liu,YongQiang Chen,Tao Zhang,XiaoSha Lin

Polymer flooding was one of the most cost-effective methods for enhanced oil recovery (EOR). It was the key for enhancing oil recovery that studying novel polymer could cope with harsh reservoir conditions. In this work, a hyperbranched nanowire (O-20 @PAM@CNTs) for polymer flooding was synthesized by in situ polymerization with monomers and hybrid carbon nanotubes (CNTs). FT-IR, 1 H NMR, TEM, gel permeation chromatograph (GPC) and rheometer were used to characterize the composition , micro-morphology, MWD (molecular weight distribution) and rheological properties of O-20 @PAM and O-20 @PAM@CNTs. Compared with O-20 @PAM, O-20 @PAM@CNTs showed excellent viscosification, temperature resistance, anti-shear and viscoelastic properties. The hyperbranched nanowire had the best performance with the content of hybrid CNTs of 0.2% w/w and which molecular weight (741999) was about half that of O-20 @PAM (1330629). Enhanced performance of the O-20 @PAM@CNTs could be attributed to the hybrid CNTs provided polymer a hyperbranched structure to build more compact and complex network and boost the association between polymer chains. Besides, the fatty alcohol polyoxyethylene ether(O-20) on the chains of O-20 @PAM@CNTs raised the viscosity of flooding liquid by emulsification and that partly compensated the heterogeneity of the core, thus improved the displacement efficiency markedly. Core Flooding Experiments shown that 0.3 times of pore volume O-20 @ [email protected] increased oil recovery by 17.5% contrasting only 11.6% for 0.4 times of pore volume O-20 @PAM, in the same solution concentration (2000 ppm). O-20 @PAM@CNTs had more obvious advantage in performance and more economical than O-20 @PAM, which indicated a better application of O-20 @PAM@CNTs in EOR.

Rational engineering WO3-X/CNTs@carbon fiber membrane for the high-efficient produce H2O2 via electrochemical two-electron water oxidation route

Lei Ge,Yingjie Ding,Chaoyang Zhu,Zezhong Xu,Hongdian Lu,Kunhong Hu,Ping Chen,Jinsong Xie

The electrochemical two-electron water oxidation reaction (2e-WOR) offers a promising avenue for hydrogen peroxide (H 2 O 2 ) production. It is crucial to design electrocatalysts with high selectivity, yield, resource abundance, and environmental friendliness. In this paper, as a new generation 2e-WOR electrocatalyst, the WO 3-X /CNTs@carbon fiber membrane nanostructure with abundant oxygen-rich vacancy (O V ) has been discovered by a series of test techniques including XRD, FE-SEM, TEM, FT-IR, Raman and XPS, comprising interconnected carbon nanotubes and carbon fibers enveloped in WO 3 nanorods with oxygen-rich vacancies. By comparing the specific surface area of WO 3-x /CNTs@carbon fiber membrane at different temperatures, it was observed that the maximum value is 44.09 m 2 /g when the mass ratio of AMT to PAN was 3:2 at 600 °C. Furthermore, the WO 3-X /CNTs@carbon fiber membrane can be directly utilized as an independent electrode. The electrochemical performance test revealed that the Faraday efficiency of the WO 3-X /CNTs @CF-600-2 can reach 54 % (2.48  V vs RHE (reversible hydrogen electrode)), while the H 2 O 2 yield can achieve 10.3 μmol· min −1 ·cm −2 , nearly ten times higher than that of pure WO 3 . Furthermore, the stability testing demonstrated that after 12 h, the WO 3-X /CNTs @CF-600-2 exhibited excellent stability with minimal change in its Faraday efficiency. This enhancement is attributed to the improved selectivity of WO 3 , excellent electrical conductivity, and mass transfer performance of carbon fiber. Finally, we proposed a mechanism for 2e-WOR and provided some perspectives on this reaction along with summarizing recent discoveries.

Thin film composite reverse osmosis membranes with metal-organic coordination complexes stabilized CNTs interlayer for enhanced removal of trace organic contaminants

Lin Liu,Xiaocheng Lin,Weiyi Li,Xin Liu,Fuqiang Fan,Yi Yang,Ying Mei

Reverse osmosis (RO) has been recognized as a reliable technique for wastewater reclamation. To enhance its rejection of trace organic contaminants (TrOCs), a novel strategy was proposed to improve reverse osmosis (RO) membranes by fabricating thin-film nanocomposite membrane (TFNi) with a TA-Fe 3+ /CNTs interlayer. The TFNi-30 membrane was obtained by optimizing the loading capacity. This optimized membrane gave rise to an enhanced water permeance of 3.2 ± 0.2 L m -2  h -1 bar -1 , which was two times higher than that of the control membrane (1.1 ± 0.2 L m -2  h -1 bar -1 ), while achieving a considerably higher rejection of inorganic salts and trace organic contaminants (TrOCs) thanks to the formation of a denser polyamide rejection layer. In addition, the specific roles of the interlayer structure in determining the separation performance of RO membranes were investigated by tailoring the support-free RO membranes and comparing them with the conventional membranes. This study would provide a peer reference for designing high performance RO membranes for wastewater reclamation via the TFNi strategy.

Flexible Pressure Sensors Based on CB/CNTS at PDMS for Wind Pressure Field Monitoring of Cable-Stayed Bridge Using Machine Learning

Yifeng Huang,Yifan Gao,Xiaoming Wang,Wentao Dong,Daojin Yao,Xiao Cheng,Yong Hu

One-pot hydrothermal in situ growth of In4SnS8@MoS2@CNTs as efficient Pt-free counter electrodes for dye-sensitized solar cells

Mian Gao,Zhitao Shen,Gentian Yue,Chen Dong,Jihuai Wu,Yueyue Gao,Furui Tan

Developing a synthesis method for large-scale preparation of efficient and economical non noble metal counter electrode (CE) electrocatalytic materials with good catalytic ability and stability is an ideal choice for the commercialization of dye-sensitized solar cells (DSSCs). In this paper, a novel micro-nanostructured composite of CE was prepared by fixing the In 4 SnS 8 and MoS 2 on carbon nanotubes (CNTs) and using a one-step hydrothermal strategy. The devices based on the In 4 SnS 8 @MoS 2 @CNTs composite CE performs high power conversion efficiency of 8.72%, far more than that of the device with the control ones (7.57%). The In 4 SnS 8 @MoS 2 composite were homogeneously distributed on the CNTs surface to form a new In 4 SnS 8 @MoS 2 @CNTs composite network heterojunction . This distinctive porous structure can provide greater contact area and electronic transmission channel to ensure fast charge transport of electrolyte. The prefect electrochemical properties of the In 4 SnS 8 @MoS 2 @CNTs CE for the I − /I 3 − electrolyte also have been demonstrated by a series of electrochemical tests. As a result, it can be considered that the In 4 SnS 8 @MoS 2 @CNTs will replace the Pt CE and has broad application prospects in DSSCs.

Layer-by-Layer Assembly of Multifunctional NR/MXene/CNTs Composite Films with Exceptional Electromagnetic Interference Shielding Performances and Excellent Mechanical Properties

Hao Wu,Chuanbiao Zhu,Xiaolong Li,Xinpeng Hu,Heng Xie,Xiang Lu,Jin-Ping Qu

With the rapid advance of electronics, the light, flexible, and multifunctional composite films with high electromagnetic interference (EMI) shielding effectiveness and excellent thermal management are highly desirable for next-generation portable and wearable electronic devices. Herein, a series of flexible and ultrathin natural rubber/MXene/carbon nanotubes (NR/MXene/CNTs) composite films with sandwich structure are constructed layer by layer through a facile vacuum-assisted filtration method for EMI shielding and Joule heating application. The fabricated NR/MXene/CNTs-50 composite film, with NR/MXene as inner layer and NR/CNTs as out layers, not only has high EMI shielding efficiency, but also has excellent comprehensive mechanical properties at the thickness of only 200 µm. In addition, the superior environmental durability, high electrothermal conversion efficiency, hydrophobicity, and fine performance stability after periodic cyclic bending make the film possess more value in practical application.

Chain-tailed dodecahedron structure derived from Zn/Co-ZIFs/CNTs with excellent rate capability as an anode for lithium-ion batteries

Hang Fu,Chonghua Shi,Zhitong Li,Jiajin Nie,Shaowei Yao

Herein, a unique dodecahedron composite material of Zn-Co bimetallic zeolitic imidazolate frameworks (ZIFs) and carbon nanotubes (CNTs) is synthesized by a simple room temperature static precipitation-annealing process. As an anode material for lithium-ion batteries (LIBs), the designed nanomaterials exhibits excellent lithium storage performance and cycle performance. It demonstrates a high discharge specific capacity of 720.9 mAh g -1 at 100 mA g -1 . Besides, a high reversible capacity of 608.7 mAh g -1 at a current density of 500 mA g -1 after 300 cycles. The significant improvement in the electrochemical performance of Zn/Co-ZIFs/CNTs nanocomposite can be attributed to the strong synergy between Zn/Co-ZIFs and CNTs.