Journal of Materials Research and Technology-JMR&T
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2023
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IF 6.4
Shangqiao Wu,Yichun Liu,Jie Yu,Qi Zhao,Jingmei Tao,Zhong Wu,Jinfeng Zhang,Yunying Fan,Yanzhang Liu,Caiju Li,Jianhong Yi
In this paper, inhomogeneous copper matrix composite with carbon nanotube reinforced copper foam (CNTs/Cu f ) as the three-dimensional (3-D) skeleton is designed to overcome the paradox between strength and ductility or conductivity. The open cell composite foams with uniformly embedded CNTs are filled with dense copper phase in the foam pores by spark plasma sintering (SPS) to form the inhomogeneous composites. The inhomogeneous composite reinforced with CNTs/Cu f shows a combination of high electrical conductivity (93.4% IACS), tensile strength (366.7 MPa), and fracture elongation (31.78%) with a quite low CNTs content (0.2414 vol%). In addition, the polarization curves and AC impedance (EIS) tests show that the best corrosion resistance is achieved with the CNTs content of 0.2414 vol%, and the corrosion rate is reduced by 71.9% and 49.1% compared with the Cu and Cu f ®Cu samples, respectively.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Jingxuan Zhao,Hongxu Liu,Peng Xue,Yuchao Qi,Ziwei Lv,Ruijia Wang,Yucheng Wang,Shulin Sun
In the process of removing dye wastewater, the membrane surface is susceptible to contamination, resulting in reduced performance and limited dye separation efficiency. A single hydrophilic modification layer is not enough to achieve effective separation of different types of dyes. The present research designed a "double layer protection" method in order to overcome the above deficiencies. A solution of dopamine (DA) coated carbon nanotubes (CNTs-COOH) was covered on the surface of the polyvinylidene fluoride (PVDF) membrane by deposition, followed by grafting a layer of chitosan (CS) polymer brushes on its surface. The spatial double layer structure provides an excellent barrier effect and effectively reduces the contamination of dyes. When filtering different types of dyes, effective filtration of anionic and cationic dyes through the electrostatic effect of the first layer, the adsorption of CNTs in the second layer and the hydration layer of both layers. All membranes have excellent rejection properties. More importantly, the membranes also had good chemical and mechanical stability and their serviceability was not degraded. Therefore, the prepared PVDF-based multi-layer composite membranes behave a potential application prospect in the wastewater purification field.
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PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Huijiao Wang,Lingwei Gao,Yuxin Xie,Gang Yu,Yujue Wang
Singlet oxygen ( 1 O 2 ) has often been identified by the popularly used quenching method as a more important reactive species (RS) than sulfate radicals (SO 4 •− ) and hydroxyl radicals ( • OH) for pollutant abatement during persulfate-based advanced oxidation processes (PS-AOPs), especially those activated by carbon-based catalysts. However, latest studies have demonstrated that the quenching method actually can often mislead the interpretations of the role of RS for pollutant abatement during AOPs due to various confounding effects caused by adding high-concentration quenchers in the system. To clarify the role of 1 O 2 in PS-AOPs, this study developed a probe compound-based experimental and kinetic model to quantify the concentrations and exposures of 1 O 2 , SO 4 •− , and • OH, as well as their relative contributions to pollutant abatement during a cobalt oxide incorporated carbon nanotubes activated peroxymonosulfate (Co 3 O 4 @CNTs/PMS) process. Results show that during the Co 3 O 4 @CNTs/PMS process, the exposures and transient concentrations of 1 O 2 were about 19.6 and 41.3 times higher than those of SO 4 •− and • OH, respectively. However, the relative contribution of 1 O 2 to the abatement of most pollutants tested in this study (e.g., sulfisoxazole, sulfamethoxyprazine, trimethoprim, and metoprolol) is generally negligible ( f 1 O 2 ≤ 8%) compared to that of SO 4 •− and • OH ( f SO 4 • − = 15%−98% and f • OH = 2%−78%) because of the significantly lower reactivity of 1 O 2 with these compounds than that of SO 4 •− and • OH. Reasons for misidentifying 1 O 2 as the dominant RS for pollutant abatement by the quenching method were then analyzed based on reaction kinetics principles. The results of this study highlight that while 1 O 2 can be generated in significant amounts and be present at higher concentrations than SO 4 •− and • OH in PS-AOP systems, 1 O 2 is unlikely to be the dominant RS for the abatement of most pollutants during the PS-AOPs because of its weak and selective oxidation capacity, and caution should be taken when using the quenching method to evaluate the role of RS for pollutant abatement by the PS-AOPs.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
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IF 9.463
Shuai Yang,Yang He,Yanju Liu,Jinsong Leng
In this paper, we synthesized the shape memory poly(aryl ether ketone) (PAEK) and fabricated the radially oriented CNTs enhanced PAEK composite actuators. The introduction of highly aligned CNTs endowed PAEK matrix great thermal stability, good mechanical properties, and excellent shape memory effect. The formation of CNTs conductive path in PAEK matrix was instrumental in improving thermal and electrical conductivity, promoting efficient heat/electric dual triggered shape memory effect with high recovery ratio, rapid shape recovery and low triggering voltage. In addition, we used aligned CNTs/PAEK composites with 15 wt% CNTs as voltage actuators, and designed the two kinds of voltage actuators (angle-mode and time-mode) to achieve the different actuating actions via the applied voltage (range from 8 V to 50 V). These efficient composite voltage actuators exhibited the excellent stability and durability in continuous voltage actuating, which were expected to open door for smart actuators and electronic devices.
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COMPOSITE STRUCTURES
·
2023
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IF 6.3
Xiaoli Wu,Yunyi Li,Ting Yin,Yijun Liao,Site Mo,Wanxia Huang
The aligned CNT-based composite in transverse direction to the alignment is considered as completely insulating and unsuitable for utilization in de-icing system. Here, we have found that the aligned CNT-based composite in transverse direction to the alignment exhibited excellent electrothermal performance at high voltage, for the first time. Furthermore, we compared and investigated the electrical and electrothermal performance of the aligned and random non-percolative CNT/crosslinked polyethylene (XLPE) composites at high voltage. A temperature increase of 7.5–72.7 ℃ at a record high voltage of 900–3100 V is reached for the aligned CNT/XLPE composites. The filed emission at high voltage enables the electron to transfer along the CNTs radial direction , resulting in joule heating for the aligned CNT/XLPE composites in transverse direction to the alignment. Besides, the non-percolative structure contributes a temperature increase of 8.2–40.1 ℃ at a applied voltage of 900–2800 V to random CNT/XLPE composites. The high applied voltages is significantly higher than rGO-based composites. More importantly, effective de-icing and anti-icing performance at high voltage of 900–2800 V are achieved for the random non-percolative and aligned CNT-based composites at −20 ℃. These results demonstrate the potential of applying the CNT/XLPE composites in de/anti-icing system of transmission-lines and other fields requiring joule heating at high voltage.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
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IF 6.019
Bin Xu,Chenghua Chen,Jing Zhou,Zhongjin Ni,Xiaochun Ma
In this study, a novel microencapsulated phase change material paraffin@Cu-Cu 2 O/CNTs was successfully prepared by hydrothermal reduction and in situ deposition method , in which paraffin as the core, Cu, Cu 2 O and carbon nanotubes (CNTs) as the shell. SEM and TEM results proved that the microcapsules have a core-shell structure, the CNTs were irregularly wrapped on the shell, and the diameter of the microcapsules was about 600-800 nm. The melting temperature and latent heat of the paraffin@Cu-Cu 2 O/CNTs microcapsules were 61.17 °C and 81.31Jg -1 , respectively, and the encapsulation rate of the microcapsules was calculated to be 41.53% from the results of the DSC measurement. Due to the shell material, the paraffin@Cu-Cu 2 O/CNTs microcapsules displayed excellent thermal stability, its thermal decomposition temperature is increased by 97 °C compared to paraffin. Moreover, the paraffin@Cu-Cu 2 O/CNTs microcapsules were dispersed in water to form a new kind of slurry, such fluid exhibited great improvement in terms of thermal conductivity , specific heat capacity , light absorption performance and photo-thermal conversion efficiency than that of paraffin@Cu-Cu 2 O microcapsules slurry. Therefore, the high heat storage capability and excellent photo-thermal conversion performance of the paraffin@Cu-Cu 2 O/CNTs microcapsule slurry make it to be the most potential heat transfer fluid for direct absorption solar collector.
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Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 2
·516-526
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IF 8.867
Qichen Wang,Yongpeng Lei,Zhiyan Chen,Nan Wu,Yaobing Wang,Bing Wang,Yingde Wang
3d transition metals or their derivatives encapsulated in nitrogen-doped nanocarbon show promising potential in non-precious metal oxygen electrocatalysts. Herein, we describe the simple construction of a bifunctional oxygen electrocatalyst with a “framework-active sites” structure, namely Fe/Fe3C@C (Fe@C) nanoparticles encapsulated in 3D N-doped graphene and bamboo-like CNTs (Fe@C–NG/NCNTs). The Fe@C structure provides additional electrons on the carbon surface, promoting the oxygen reduction reaction (ORR) on adjacent Fe–Nx active sites. The 3D NG hybrid with a bamboo-like CNTs framework facilitates fast reactant diffusion and rapid electron transfer. The optimized sample displays excellent ORR and oxygen evolution reaction (OER) activity, with a potential difference of only 0.84 V; this places it among the best bifunctional ORR/OER electrocatalysts. Most importantly, Zn–air batteries using Fe@C–NG/NCNTs as the cathode catalyst deliver a peak power density of 101.2 mW cm−2 and a specific capacity of 682.6 mA h g−1 (energy density of 764.5 W h kg−1). After 297 continuous cycle tests (99 h), the rechargeable batteries using Fe@C–NG/NCNTs show a voltage gap increase of only 0.13 V, almost half that of Pt/C + Ir/C (0.22 V) under the same conditions. This work provides new insight into advanced electrocatalysts utilizing the structural features of host nanocarbon materials and guest active species toward energy conversion.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Hui Lu,Hongbo Wang,Changfei Gao,Lifen Liu,Tingting Yu,Yihua Li,Shaoying Lin
Lanthanum and cerium are widely used as important raw materials for energy storage batteries due to excellent natural electrical, magnetic, and optical properties. However, with the explosive growth of new energy generation and the environmental degradation-resistant of lanthanum and cerium, it is difficult to balance environmental sustainability and resource scarcity to achieve lanthanum-cerium removal by conventional chelate salt precipitation. Herein, a laboratory-scale self-powered electro-membrane bioreactor (SPEMBR), integrating high-active nitrogen-doped carbon nanotube-loaded iron and molybdenum bimetallic conductive composite electrode membrane (M−N−CNTs@Fe/Mo) by hydrothermal and phase inversion processes was successfully constructed and evaluated for removing lanthanum cerium from industrial wastewater. The prepared bi-functional M−N−CNTs@Fe/Mo5% electrode membrane exhibited a uniform morphology and excellent hydrophilicity, with nano pore lattice spacing only 0.2637 nm. Electrochemical test results demonstrated that the novel electrode indicated excellent redox properties (i 0 = 8.35 × 10 −3 A cm −2 , C dl = 1.13 mF cm −2 ) and efficient electron transfer efficiency (R ct = 4.69 Ω, n = 3.9). Based on optimized conditions (5)% doping ratio, pH = 10, C = 20 mg/L), the SPEMBR assisted by M−N−CNTs@Fe/Mo catalytic electrode membrane achieved approximately complete removal efficiency of lanthanum and cerium (>99.2 %), superior to most publicly available related studies (86.3 %-99.0 %), but with a calculation cost of only $8.54. Identification of membrane interface products and system precipitates demonstrated that the outstanding removal efficiency was attributed to the combined reaction mechanism of electroreduction, electrocoagulation and electromembrane filtration. This work provides a bright application prospect for low-cost and effective removal of lanthanum cerium metal based on electrode membranes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Cheng Lin,Jilong Tang,Sizhuo Wang,Qun Gao,Yanlin Liu,Wei Wu,Xiaoli Wang,Zhenguo Huang,Limei Yang
Featuring low cost and high theoretical capacity, phosphorus-rich iron diphosphides (FeP 2 ) have emerged as excellent anode candidates for lithium-ion batteries. However, the typical chemical synthses involving high temperatures and toxic gases have restricted the mass production of FeP 2 . We now report a FeP 2 /C/CNTs@3D interconnected graphene aerogel composite synthesized by ball milling and low temperature heat treatment. Because of the unique microstructure and synergistic effect between well-dispersed FeP 2 particles and graphene aerogel , the as-prepared FeP 2 /C/ [email protected] % displays excellent lithium storage performance in terms of reversible capacity (886 mA h g −1 at 0.1 A g −1 ), cycling stability (476 mA h g −1 at 2 A g −1 even after 1000 cycles), and rate capability (685 mA h g −1 at 5 A g −1 ). Machine learning methods (decision tree and random forest algorithms) prove effective in evaluating and predicting electrochemical performance of the electrode materials.
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高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 8
·3342-3349
·
IF 8.867
Yakun Tang,Lang Liu,Hongyang Zhao,Lingbing Kong,Zaiping Guo,Shasha Gao,Yuanyuan Che,Lei Wang,Dianzeng Jia
Robust hybrid porous bamboo-like carbon nanotubes (CNTs), with ultrafine Li4Ti5O12 nanoparticles homogeneously embedded, are synthesized by a facile sol–gel process, combined with subsequent heat treatment. The nanohybrids exhibit a reversible capacity as high as 582.4 mA h g−1 at 0.2 A g−1 after 500 cycles, together with excellent rate capability and long-term cycling stability at high current densities. A high discharge capacity of 114.2 mA h g−1 at 5 A g−1 is attained for up to 3000 cycles. The superior electrochemical performance of the nanohybrids is attributed to their structure rather than their composition. Their exceptional electrochemical performance benefits from the high electrical conductivity of the porous carbon matrix, which not only provides continuous three-dimensional electron transportation routes but also simultaneously solves the major problems of pulverization, loss of electrical contact, and particle aggregation of Li4Ti5O12 anode. In addition, the highly dispersive, ultrafine Li4Ti5O12 nanoparticles greatly shorten the diffusion paths for both electrons and ions. Such a structure not only preserves all the advantages of one-dimensional nanostructures, but also offers potential for a high packing density of electrode materials. Surely, this strategy can be widely extended to other anode materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yang Yu,Ying Xue,Jingxuan Zhao,Ke Ning,Shulin Sun
The global water pollution problem is increasingly severe, and the wastewater separation technology has received high attention. Polyvinylidene fluoride (PVDF) fiber membranes have a great potential in wastewater treatment. However, its large pore size and high porosity lead to low retention rate and high contamination, which make it impossible to reuse. In this study, it was assumed that the modified nanoparticles CNTs-COOH@TA were prepared by modifying CNTs with tannic acid (TA) through π-π conjugation, and were used as the support layer of the PVDF matrix by electrostatic spinning. The chitosan hydrogel was tightly bound to the PVDF-CNTs-COOH@TA nanofiber support through hydrogen bonding and electrostatic interaction to confer the strong hydrophilicity on the surface of the composite fiber membranes, and the composite PVDF-CNTs-COOH@TA-CS membranes should have excellent performance in PVDF water treatment. The PVDF-CNTs-COOH@TA-CS composite fiber membrane should have high hydrophilicity, high retention rate and reusability. Compared to other separation membranes, the composite membranes achieved effective separation of the oil-in-water emulsion and the dye wastewater while maintaining the rapid permeation of the aqueous phase. The pure water flux of the optimum CS3 composite membrane was 1907.8 Lm -2 h -1 bar -1 , which could completely separate oil-in-water emulsion and retain more than 90% of dyes. In addition, the flux recovery rate (FRR) of the CS3 composite membrane was still more than 86.8% after five cycles, and which had a good antifouling ability. The maximum tensile strength of CS3 increased by 279.7% over PVDF fiber membrane. This innovative approach based on synergistic modification of natural materials provides new ideas for the development of efficient and environmentally friendly wastewater treatment technologies.
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Frontiers in Chemistry
·
2019
·
IF 3.782
Hao Guo,Yong Hu,Xiaoping Zhang,Rongliang Zhang,Dong Hou,Yulei Sui,Ling Wu
In this paper, we report a facile one-step hydrothermal method to synthesize tetragonal Na3V2(PO4)2F3@C particles which are connected by carbon nanotubes (CNTs) networks, using water as hydrothermal solvents. In this strategy, the reduction and crystallization of materials are carried out in the hydrothermal process (180°C, 12 h), no additional heat treatment is required. The well-crystallized Na3V2(PO4)2F3 tetragonal grains (5–10 μm) are coated with amorphous nano-carbon and connected by highly conductive CNTs. The addition of CNTs can not only improve the conductivity of materials but also effectively inhibit the Na3V2(PO4)2F3 grains over growth. The Na3V2(PO4)2F3@C/CNTs composite possesses very flat charge/discharge platforms of 3.6 and 4.1 V. The sample exhibits an initial discharge specific capacity of 120.2 and 74.3 mAh g−1 at 0.1 and 10 C rate, respectively, and shows excellent cyclical stability. The composite owns excellent electrochemical performances owing to the three-dimensional highly conductive network which is co-constructed by the CNTs and nano-carbon coating layer.
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危险品化学品经营许可证（带存储）