ENERGY & FUELS
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2021
·
IF 3.605
Zefeng Fu,Feixiang Bian,Junkai Ma,Wenkui Zhang,Yongping Gan,Yang Xia,Jun Zhang,Xinping He,Hui Huang
Silicon is considered as an ideal anode material for the next generation of lithium-ion batteries (LIBs) owing to its high specific capacity, low lithiation potential, and high natural abundance. However, its potential application is greatly restricted by poor electrical conductivity and large volume expansion during lithiation/delithiation processes. Herein, a novel solid-state reaction route is developed to synthesize a silicon/carbon nanotubes/carbon (Si/CNTs/C) composite by directly reacting magnesium silicide (Mg2Si) with lithium carbonate (Li2CO3). This method realizes synchronous formation of Si, CNTs, and amorphous carbon with a good interfacial configuration. Transmission electron microscopy (TEM) reveals that MgO may be responsible for the in situ growth of CNTs during the chemical reaction process. The crystalline Si particles are encapsulated by CNTs and the amorphous carbon matrix, which not only accommodates the volume expansion of Si but also enhances the integral electronic conductivity. Consequently, the Si/CNTs/C composite exhibits a high reversible capacity (702 mA h g–1 at 0.2 A g–1), excellent rate performance (420 mA h g–1 at 5 A g–1), and long cycling life (over 1500 cycles) when used as an anode for LIBs. Notably, this research might provide a new strategy for large-scale synthesis and utilization of Si/C composites in high-performance LIBs.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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锂离子电池
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2026
·
IF 4.4
Shaoqing Geng,Xuehui Zhao
Membrane separation technology is a selective physical separation method that is widely used in the fields of wastewater reuse and recycling. However, its separation effect on small molecules in pollutants is not ideal. In this study, the negative pressure filtration method was adopted, combining membrane separation with photocatalytic technology to prepare a sandwich-structured WO 3 /g-C 3 N 4 /CNTs curtain hollow fiber photocatalytic membrane module with. By changing the experimental conditions, membrane anti-pollution property, stability and self-cleaning ability of the membrane module were studied under visible light irradiation. Through characterizations, it was found that when WCN/CNTs = 2:1 and pH = 12, the degradation rate of MB by the membrane module after 4 h of using was still 89.47%, which was 42.60 times higher than that of pure PVDF membrane module, and the water flux recovery rate (FRR) was as high as 98.21%. Stability experiments show that the degradation rate and flux of this membrane module remain stable at various pH levels, and the FRR values are all above 96.80%, while the FRR value of pure PVDF membrane modules is only 72.94%. This study provides a new idea for the preparation of semiconductor-based composite photocatalytic membranes with high self-cleaning ability and photocatalytic activity in the field of wastewater treatment.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yabo Gao,Hang Li,Huicong Lei,Xin Wang,Ling Zhang,Haijun Zhang,Zhong Huang,Shaowei Zhang
Low-carbon MgO-CaO-C refractories are promising for clean steel refining, but their application is limited by CaO hydration and the deterioration of high-temperature performance caused by reduced carbon content. In this work, a CNTs/CaCO 3 co-coated MgO-CaO powder (CC-MCP) was successfully fabricated via a densified micro-zone deposition process employing MgO-CaO particles, polyethylene powder, and starch as materials. The as-prepared CC-MCP were incorporated into low-carbon MgO-CaO-C refractories to achieve a “two birds with one stone” effect, simultaneously enhancing both hydration resistance and high-temperature service performance. Compared to the control sample prepared with flake graphite as carbon source, the counterpart containing CC-MCP exhibited superior hydration resistance and high-temperature performances, including a 286% improvement in water vapor resistance, an increase of up to 209% in oxidation resistance, a 36% improvement in thermal shock resistance, and a reduction in slag penetration depth from 654 μm to 435 μm. This “two birds with one stone” strategy provides an effective and scalable route for developing high-performance ultralow -carbon MgO-CaO-C refractories for clean steel production, while simultaneously offering a practical solution to the hydration challenges faced by CaO-containing refractories under harsh storage and service conditions.
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POLYMER COMPOSITES
·
2025
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IF 4.7
Guangyu Zhu,Jinping Guo,Xi Lu,Yanxia Cao,Yanyu Yang,Jianfeng Wang,Wanjie Wang
Basalt fiber (BF) has been regarded as a promising reinforcement material for high-strength composites because of its good mechanical properties, thermal stability, and eco-friendliness. However, the inherent interfacial incompatibility between inorganic BF and organic polyphenylene ether (PPO) resin severely limits the properties of basalt fiber-reinforced polyphenylene ether (BF/PPO) composites. This work employs maleic anhydride-grafted polyphenylene ether (PPO-MAH) and carboxylated multi-walled carbon nanotubes (CNTs-COOH) as a dual-functional hybrid sizing to improve the interfacial interaction of BF/PPO composites based on synergistic chemical bonding and mechanical interlocking. Compared with the unmodified BF/PPO composite, the interlaminar shear strength, flexural strength, and tensile strength of modified BF/PPO composites increase by 64.0%, 39.8%, and 63.4%, respectively. Furthermore, these modified BF/PPO composites exhibit excellent flame retardancy and display rapid self-extinguishing behavior and no dripping due to CNT-induced carbonization and a dense char layer. These results provide a practical, eco-friendly, and efficient approach to simultaneously improve the interfacial adhesion, mechanical properties, and flame retardancy of BF/PPO composites and enlarge their applications for aerospace, automotive, and defense applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yuanchuan Ren,Jun Wang,Guangfei Qu,Nanqi Ren,Ping Lu,Xiuping Chen,Zuoliang Wang,Yuyi Yang,Yan Hu
Three-dimensional electrochemical reactor (3DER) is an efficient technology for the treatment of printing and dyeing wastewater. The particle electrode between anode and cathode is the core unit of 3DER, which determines the treatment efficiency of wastewater. However, the deactivation of the particle electrode caused by the coverage of the catalytic sites seriously hindered the continuous operation of 3DER. In this work, γ-Fe 2 O 3 @CNTs particle electrode was prepared by immersion calcination , and its performance was evaluated by degradation of Rhodamine B (RhB) wastewater in 3DER. The study showed that in γ-Fe 2 O 3 @CNTs/Mn@FNE-3DER, the removal rate of RhB reached the best of 99.16% within 7 min under the conditions of γ-Fe 2 O 3 @CNTs dosage of 1.00 g·L -1 , initial RhB concentration of 100 mg·L -1 , pH 7.0, and current density of 20 mA·cm −2 . The superior catalytic activity of the system is mainly due to the charge transfer channel in γ-Fe 2 O 3 @CNTs structure, which improves the mass transfer efficiency of electrons. According to LC-MS analysis, the degradation process of RhB can be divided into five stages: deethylation, chromophore cracking, debenzylation and deamination, ring opening and mineralization. Hydroxyl radicals play an important role in this process. After the reaction, most RhB is converted into CO 2 and H 2 O. In addition, the study also showed that the Fe 3+ /Fe 2+ circulating system formed between the anode and cathode was the important reason for the high degradation efficiency of RhB. After five cycles of experiments, the degradation efficiency of 92.55% was still maintained, indicating that the particle electrode has significant stability and reusability in the catalytic process. To sum up, the excellent performance of γ-Fe 2 O 3 @CNTs particle electrode in three-dimensional electrochemical system provides a promising idea for the actual treatment of printing and dyeing wastewater.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Danyang Li,Qiaomei Luo,Hongqiang Xin,Chen Wang,Yiwei Zhao,Huizhong Bai,Fei Ma
Controllable fabrication of high-performance and inexpensive heterogeneous catalysts is crucial for the electrochemical hydrogen evolution reaction (HER) and renewable energy. Wood-derived electrodes provide new opportunities. Herein, N-doped carbon nanotubes (CNTs) encapsulating metal particles are in situ generated on graphitized wood (GW)-derived porous carbon frameworks and molybdenum disulfide (MoS2) nanoflakes are dispersively anchored on CNTs, resulting in hierarchical structures as a hybrid electrode (M/CNT@MoS2@GW, M = Fe, Co, and Ni). The wood matrix hybrid electrodes with abundant microchannels and hierarchical pores could supply electrolytes for continuous reaction and boost gas diffusion. Consequently, the hybrid electrocatalyst Fe/Fe3C/CNT@MoS2@GW exhibits superior HER activity with an overpotential as low as 66.79 mV at 10 mA cm–2 in an alkaline solution. The activity of the hybrid structure is reduced only by 10.18% at 20 mA cm–2 after 48 h electrolysis, with nearly no decay after 5000 cyclic voltammetry (CV) cycles, suggesting good stability and durability. Density functional theory calculations illustrate that a thermodynamically favorable hydrogen adsorption free energy (ΔGH* ≈ 0.07 eV) promotes the catalytic reactions. The results hold great potential in the exploration of wood-derived catalysts for high-performance HER.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Xiaoyu Cui,Chengjing Miao,Shaowei Lu,Xingmin Liu,Yuxuan Yang,Jingchao Sun
Designing flexible wearable sensors with a wide sensing range, high sensitivity, and high stability is a vulnerable research direction with a futuristic field to study. In this paper, Ti3C2Tx MXene/carbon nanotube (CNT)/thermoplastic polyurethane (TPU)/polysulfone (PSF) composite films with excellent sensor performance were obtained by self-assembly of conductive fillers in TPU/PSF porous films with an asymmetric structure through vacuum filtration, and the porous films were prepared by the phase inversion method. The composite films consist of the upper part with finger-like “cavities” filled by MXene/CNTs, which reduces the microcracks in the conductive network during the tensile process, and the lower part has smaller apertures of a relatively dense resin cortex assisting the recovery process. The exclusive layer structure of the MXene/CNTs/TPU/PSF film sensor, with a thickness of 46.95 μm, contains 0.0339 mg/cm2 single-walled carbon nanotubes (SWNTs) and 0.348 mg/cm2 MXene only, providing functional range (0–80.7%), high sensitivity (up to 1265.18), and excellent stability and durability (stable sensing under 2300 fatigue tests, viable to the initial resistance), endurably cycled under large strains with serious damage to the conductive network. Finally, the MXene/CNTs/TPU/PSF film sensor is usable for monitoring pulse, swallow, tiptoe, and various joint bends in real time and distributing effective electrical signals. This paper implies that the MXene/CNTs/TPU/PSF film sensor has broad prospects in pragmatic applications.
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2023
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IF 4.6
Shuolei Wang,Wenjun Wang,Zhangyi Chi,Zhaomeng Long,Huaizhong Xu,Yubing Dong
Generally, the shape memory polymers (SMP)-based information carriers are strongly dependent on the integrity of their bodies, and once the information carriers are damages, their information is lost. In this study, the carbon nanotubes/ethylene-co-vinyl acetate (CNTs/EVA) SMP composite based information carriers with electric- and light-driven modes were prepared by hot-pressing and swelling ultrasonic method. The embedded CNTs layer on the surface of the composites provided condition for Joule effect , which enabled the composites to achieve electric-driven recovery at 50 % pre-strain and could lift 857 times their weight. Since the composites had crystallization-induced elongation and melt-induced contraction performance, the strain range could be accurately controlled by the programmed control of the power supply to achieve information transmission . Combined with the function of strain sensing, the strain signals were generated by the electric-driven and the resistance signals were generated by the light-driven were used as the communication symbol, which are not limited by their physical integrity. This study provides an experimental reference for SMP with multiple driving modes and driving-sensing integration functions, enriches the SMP-based information carrier's processing and transmission modes, and expands the function and application field of SMP.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 31
·15175-15184
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IF 3.925
Hai Wang,Jinxia Huang,Xiaobo Wang,Zhiguang Guo,Weimin Liu
Transition metal nitrides have good metallic conductivity and high pseudocapacitance, which have drawn extensive attention in the research of Zn-ion energy storage systems. In this paper, we present a novel fabrication of carbon cloth-supported TiN-coated carbon nanotube composites (TiN/CNTs@CC and TWC) via a CVD–ALD method using ethanol, TiCl4 and H2O as precursors. The prepared TWC composites can be used as self-supported electrodes with good flexibility and conductivity. Electrochemical performance tests show that the TiN/CNTs@CC electrode has a high specific capacitance of 363.5 F g−1 at 0.5 A g−1, good rate capability and excellent cycling stability with 92.9% capacity retention over 10 000 charge/discharge cycles. Impressively, the assembled zinc ion hybrid capacitor can achieve a high energy density of up to 81.8 W h kg−1 at a power density of 137.7 W kg−1. Even at a power density of 3013.7 W kg−1, a high energy density of 26.4 W h kg−1 is still achieved. This study provides a new insight into the application of nitride-derived carbon materials in zinc-ion hybrid capacitors.
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Analytical Methods
·
2023
·Vol. 15
·期 35
·4494-4505
·
IF 3.1
Chao Sun,Lizheng Wang,Naiyu Guo,Runze Hu,Li Ye,Zhiming Hu,Jianjun Ding
Surface-enhanced Raman scattering (SERS) has a unique fingerprint spectrum, which allows for rapid, highly sensitive, and non-destructive detection without the need for sample pretreatment. However, SERS substrates have disadvantages such as short storage time and poor reproducibility. In this study, carbon nanotubes, gold, and silver were combined to take advantage of their inherent structural and characteristic properties that enhance the Raman effect. A new type of SERS composite substrate, CNTs/Ag@Au/SiO2, was prepared using a hydrothermal method and seed growth method. The substrate was characterized using transmission electron microscopy (TEM), and the average distance between the core–shell nanoparticles was found to be 3.1 nm, which is more suitable than other gold–silver combined core–shell structures and significantly improves the SERS enhancement factor. The substrate demonstrated high sensitivity even at low concentrations of probe molecules and good uniformity at five randomly selected locations. After storage for 45 days, the substrate still exhibited good stability. In most gold–silver combined core–shell structures, the detection limit for Rhodamine 6G (R6G) is 10−9 mol L−1, while in this substrate, the detection limit for R6G is 10−11 mol L−1. Furthermore, the contribution of the substrate's enhancement was deeply investigated using finite-difference time-domain (FDTD), which revealed that the substrate's hotspots were present in two forms: the “hotspots generated between Ag@Au nanoparticles” and the “hotspots generated between Ag@Au nanoparticles and carbon nanotubes”. These two forms of hotspots also demonstrated that the performance brought about by the preparation of the substrate structure was reliable. The simulation results were compared with the experimental results, and the analysis showed that the real environment would have an impact on the substrate's structure during the actual substrate preparation process. Finally, the substrate was used for detecting the pesticide fipronil, and the results showed clear peaks even at a concentration of 0.1 mg L−1. The results indicated that the Raman intensity was linearly exponential with the fipronil solution concentration, with a determination coefficient of R2 = 0.991. This study provides a new SERS substrate for pesticide residue detection and further explores the improvement of pesticide detection limits.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Bo Song,Zhide Liu,Tingting Wang,Li Wang
To improve the interfacial adhesion and mechanical performance of PBO fiber composites, CNTs were uniformly grafted onto them at a high-density. The grafting of CNTs with massive reactive groups can improve the surface wettability and interfacial interaction of PBO fibers with epoxy resin. The IFSS and ILSS values of the modified composites (PBO-CNT-3) increased by 103.09 and 62.73%, respectively. As CNTs can strengthen interfacial regions of the composites, the mechanical properties (hardness and modulus) of the interphase were enhanced significantly. This led to the effective transfer of interfacial load, elimination of stress concentration, and improvement in the structural stability of the composites. As a result, the impact strength of the modified composites (PBO-CNT-3) was up to 103.76 kJ/m 2 (an increase of 56.24%) compared to the original composites. The surface morphology and deformation behavior of the fractured composites indicate that the interfacial failure mode of the composites grafted with CNTs changes from adhesive failure to both cohesive and substrate failure. This strategy of grafting CNTs at a high-density opens a new avenue for the interfacial regulation of structural composites, ultra-capacitor, sensor, and catalytic materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Fanghui Wang,Yajun Zhang,Yimeng Luo,Yanan Wang,Hong Zhu
A dandelion-like CNTs-Ni foam composite carrier supported Co–Mo–P ternary alloy catalyst (Co–Mo–P/CNTs-Ni foam) was prepared by electroless plating . The structure of Co–Mo–P/CNTs-Ni foam catalyst is characterized by XRD , SEM, XPS and EDS . The particle size of Co–Mo–P ternary alloy nanoparticles is about 80 nm. The Co–Mo–P/CNTs-Ni foam completely retains the tubular structure of carbon nanotubes and the gaps between carbon nanotubes of CNTs-Ni carrier, which increases the specific surface area of the catalyst and the flow space of reactants and products. Co–Mo–P/CNTs-Ni foam catalyzes sodium borohydride alcoholysis to produce hydrogen at a maximum rate of 2.64 L ·min −1 ·g −1 , and the reaction activation energy is 47.27 kJ ·mol −1 , which is far lower than that of the spontaneous alcoholysis reaction of sodium borohydride. After the Co–Mo–P/CNTs-Ni foam catalyst was reused 8 times, the catalytic hydrogen production rate was reduced by 23% compared with the initial rate.
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