COMPOSITES PART B-ENGINEERING
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2021
·
IF 9.078
Jiajia Li,Jiaqi Qian,Xiaoyu Chen,Xiaoxi Zeng,Ling Li,Bo Ouyang,Erjun Kan,Wenming Zhang
A novel Co/Ni metal-organic framework (MOF)-derived three-dimensional (3D) nanoarchitecture in which graphene carbon-coated CoNi alloy nanoparticles grow on the tips of N-doped carbon nanotubes that are vertically-aligned on carbon nanofibers (Co/Ni@GC/NCNTs/CNFs) is fabricated. The Co/Ni@GC/NCNTs/CNFs electrode has a half-wave oxygen reduction reaction (ORR) potential of 0.80 V, a superior standing stability with 84.8% current retention after 175 000 s. The oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) reach a lower overpotential of 0.395 V and 0.15 V, respectively. Moreover, the resultant sample is an air cathode catalyst in a microbial fuel cell and indicates an utmost power density of 2100 ± 45 mW cm −2 , which is much better than that of the Pt/C electrode (1334 ± 61 mW m −2 ). The density functional theory calculation demonstrates that the designed Co/Ni@GC/NCNTs/CNFs catalyst can remarkably promote OER, ORR, and HER performance.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Yanhua Yao,Changhai Liu,Linlin Luo,Dingwei Ji,Wenchang Wang,Zhidong Chen
To enhance the intrinsic activity and the density of active sites of the electrocatalyst for the hydrogen evolution reaction (HER), the microwave-assisted synthesis is adopted to prepare hierarchical Ce-doped MoSe 2 @CNTs as highly-efficient catalysts for HER in both acidic and alkaline conditions. The well-defined hierarchical nanostructure of Ce-doped MoSe 2 on multiple carbon nanotubes (MWCNTs) with few layers of MoSe 2 nanostructure. The Ce-MoSe 2 @CNTs sample with an optimal proportion of Ce:Mo (1:5) exhibits outstanding activity and long-term stability in both acidic and alkaline electrolyte. It shows an overpotential of 108 and 166 mV at 10 mA cm −2 in acidic and alkaline electrolyte, respectively. This study offers a prospective opportunity to design and fabricate the highly-effective catalysts coupling with multiple synergistic effect for efficient electrocatalysts.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Jingyun Zhao,Zexu Chi,Heng Dong,Changfu Sun,Han Yu,Hongbing Yu
This study explored the depth treatment of desphenly chloridazon (DPC) wastewater by a novel synergetic dual-electrodes electrocatalytic (SDEs) system which consisted of Ni–Sb–SnO 2 /Ti anode (NSSTA) and PEDOT/PSS-CNTs modified activated carbon air diffusion cathode (PP-CNTs AC ADC). NSSTA exhibited an enhanced capability to produce reactive oxygen species (·OH and O 3 ), its O 3 production increased to 6.54 mg/L. PP-CNTs AC ADC was observed to have improved activity of catalyzing oxygen reduction reaction (ORR) with 648.23 mg/L H 2 O 2 generated. Owing to the synergetic effect of O 3 and H 2 O 2 , additional ·OH was obtained in SDEs system through the electro-peroxone reaction. Compared with the single-electrode electrocatalytic (SE) systems, the SDEs system showed superior pesticide degradation performance , higher mineralization current efficiency (MCE) and lower energy consumption (EC). In the SDEs system, the optimal 91.7% of DPC removal efficiency and 90.7% of DPC mineralization efficiency were obtained within 150 min by electrocatalytic oxidation of 17.5 ppm and 25 ppm pesticide wastewater at the current density of 11.94 mA/cm 2 , respectively. The treated water showed reduced acute toxicity than that of the raw wastewater, which suggested that the SDEs system is a promising technology for depth treatment of the pesticide industry effluent with simultaneous decontamination and detoxification realized.
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JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Jingjing Zhao,Yu Yang,Jiazheng Jiang,Satoshi Takizawa,Li'an Hou
This study evaluated the impacts of cross-linking agents with different molecular weight (MW) on the structure of graphene oxide (GO)/carbon nanotubes (CNTs) layers and fouling mechanisms. The GO/CNTs-modified membrane was fabricated by chemical activation and vacuum filtration methods and exhibited excellent stability in antifouling performance and rejection rates. Increasing the external diameter of CNTs and MW of cross-linking agents improved the water flux through enlarging the interlayer spacing of GO/CNTs layers, showing the highest water flux of about 1280 kg/m 2 h. The large external diameter of CNTs deteriorated the antifouling performance and removal efficiency. The small cross-linking agents, i.e. ethanediamine with 60.1 Da or polyethyleneimine with 600 Da, maintained the regular lamellar structure of GO/CNTs layers, causing the high flux and DOC rejection. However, polyethyleneimine with 1800 Da promoted GO/CNTs aggregation and created non-uniform lamellar structure with high surface roughness , resulting in the severest flux decline and the lowest DOC rejection. The fouling model was also influenced by the MW of cross-linking agents; the small agents caused complete blocking while the large agent caused intermediate fouling for humic acid (HA) solution. The bridging effect of Ca 2+ resulted in intermediate fouling for all the membranes in the case of HA + Ca 2+ solution.
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高影响因子
Small
·
2023
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IF 13.3
Wei Yang,Qi Liu,Lijuan Hou,Qiang Yang,Daobin Mu,Guoqiang Tan,Li Li,Renjie Chen,Feng Wu
Iron-based sulfate cathodes of alluaudite Na 2+2 δ Fe 2− δ (SO 4 ) 3 (NFS) in sodium-ion batteries with low cost, steady cycling performance, and high voltage are promising for grid-scale energy storage systems. However, the poor electronic conductivity and the limited understanding of the phase-evolution of precursors hinder obtaining high-rate capacity and the pure phase. Distinctive NFS@C@ n %CNTs ( n = 1, 2, 5, 10) sphere-shell conductive networks composite cathode materials are constructed creatively, which exhibit superior reversible capacity and rate performance. In detail, the designed NFS@C@2%CNTs cathode delivers an initial discharge capacity of 95.9 mAh g −1 at 0.05 C and up to 60 mAh g −1 at a high rate of 10 C. The full NFS@C@2%CNTs//HC cell delivers a practical operating voltage of 3.5 V and mass-energy density of 140 Wh kg −1 at 0.1 C, and it can also retain 67.37 mAh g −1 with a capacity retention rate of 96.4% after 200 cycles at 2 C. On the other hand, a novel combination reaction mechanism is first revealed for forming NFS from the mixtures of Na 2 Fe(SO 4 ) 2 · n H 2 O ( n = 2, 4) and FeSO 4 ·H 2 O during the sintering process. The inspiring results would provide a novel perspective to synthesize high-performance alluaudite sulfate and analogs by aqueous methods.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 24
·9345-9353
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IF 3.069
Yuheng Zhang,Qi Li,Qing Gao,Jiawei Li,Yongxuan Shen,Xiashi Zhu
In this paper, the ionic liquid (IL), 1-octyl-3-methylimidazolium hexafluorophosphate ([Omim][PF6]), was employed to synthesize β-cyclodextrin (β-CD)-functionalized carbon nanotubes/TiO2 (IL–CD-CNTs/TiO2) nanocomposite via a one-pot solvothermal process. The as-prepared product was characterized by SEM, TEM, XRD, TG, FT-IR, EIS, and so forth. Coupled with an aspirated in-syringe device, IL–CD-CNTs/TiO2 could yield the rapid removal of water contaminants within 8 min. In addition to the excellent adsorption capacity, this dual-functional photocatalyst also showed enhanced photocatalytic activity under visible light at a degradation rate of 97% within 180 min. The photocatalytic mechanism based on the formation of the inclusion complex, density functional theory, and electronic structure of IL–CD-CNTs/TiO2 was comprehensively discussed. The IL not only served as the reaction medium but also played a crucial role in improving the adsorption capacity and photocatalytic activity. By exhibiting a strong electron-donating character, IL could promote efficient charge transfer, inhibiting the recombination of photogenerated electron–hole pairs. The as-prepared photocatalyst—capable of rapid adsorption and photodegradation—can meet the requirements of practical applications and reveals a promising direction toward wastewater treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Jingxuan Zhao,Hongxu Liu,Yuanhang Zhao,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun,Yiming Wang,Aihua Xie
Currently, the most effective way to improve the anti-fouling performance of water treatment separation membrane is to enhance the hydrophilicity of the membrane surface, but it can still cause contamination, leading to the occurrence of flux reduction. The construction of a strong hydration layer to resist wastewater contamination is still a challenging task. In this study, a defect-free hydration layer barrier was achieved by grafting chitosan polysaccharide derivatives (CS-SDAEM) on the membrane, which achieved in effective fouling prevention and low flux decline rate. A layer of tannic acid-coated carbon nanotubes (TA@CNTs) has been uniformly deposited on the commercial PVDF membrane so that the surface was rich in -COOH groups, providing sufficient reaction sites. These reactive groups facilitate the grafting of amphiphilic polymers onto the membrane. This modification strategy achieved in enhancing the antifouling performance. The modified membrane achieved low contamination rate with DR of 16.9 % for wastewater filtration, and the flux recovery rate was above 95 % with PWF of 1100 (L·m −2 ·h −1 ). The membrane had excellent anti-fouling performance, which provided a new route for the future development of water treatment membrane.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Wenjie Zhang,Jing Zhao,Linfeng Wang,Guofu Liu,Dekui Shen,Huiyan Zhang
The pyrolytic reforming of toluene to hydrogen and CNTs over the commercial and self-prepared Al 2 O 3 loaded with Fe through the impregnation method is investigated in a fixed bed reactor under the temperature from 600 °C to 800 °C. The physicochemical properties of Fe–Al 2 O 3 catalysts and Al 2 O 3 supports were characterized by XPS, H 2 -TPR, HRTEM and H 2 -pulse chemisorption . The reforming process over the catalyst of Fe loaded on self-prepared Al 2 O 3 gives the excellent H 2 yield of 27.8 mmol/(g-Fe) and graphite yield of 82.6 wt%, which is much higher than those from that over the catalyst of Fe loaded on the commercial Al 2 O 3 . It is evidenced by H 2 -pulse chemisorption that 5.1 % of Fe 0+ dispersion over the commercial Al 2 O 3 with mainly-exposed (110) facet while 11.2 % of Fe 0+ dispersion over self-prepared Al 2 O 3 with mainly-exposed (111) facet were obtained. The adsorption energy of iron cluster (Fe 4 ) with Al 2 O 3 (111) facet was estimated to be −14.5 eV through the DFT simulation, which is notably higher than that of iron cluster (Fe 4 ) with Al 2 O 3 (110) facet as −9.1 eV. With regard to the MD simulation along with XRD analysis of the Fe 3 C crystallite , Fe 0+ particles can be prominently molten at the high Fe 0+ dispersion over Al 2 O 3 facet, promoting the carbon solubility for the assembly of multi-wall CNTs without the deposition of unwanted amorphous carbon .
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Journal of Materials Chemistry C
·
2024
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IF 5.7
Sheng Zhang,Junyin Cheng,Bo Song,Shun Linghu,Yijun Tang,Qing Li,Lei Chen
Winter sports have gained popularity in recent years. These sports and activities, however, come with some health concerns, particularly in harsh and extremely cold conditions. A self-heating, flexible, and smart conductive material that can monitor body health in extreme conditions would thus be highly desirable. Inspired by the structure of a spider-web, a flexible pressure sensor was developed by depositing a CNTs/CuS composite coating on a fabric surface with a cellulose-entangled structure constructed by hydroxypropyl methyl cellulose (HPMC). The obtained flexible pressure sensor demonstrated stable physiological signal detection and temperature insensitivity during photothermal heating, attributed to the water-retention capacity of HPMC. In addition, it exhibited excellent electrical conductivity (resistance of 10 Ω cm−1), deicing (181s), sterilization (≈99.99%), UV resistance (UPF ≈ 13 926), environmental adaptability (−78 °C to 50 °C) and high sensitivity (13.25 ± 0.123 kPa−1). This coating process can be applied to various garments, offering new possibilities for designing and preparing wearable multifunctional sensors.
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APPLIED THERMAL ENGINEERING
·
2026
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IF 7.5
Xiaoyu Song,Xuenong Gao,Ziye Ling,Zhengguo Zhang,Yuyuan Zhuang
This study proposes the combination of copper sulfide‑carbon nanotubes (CuS-CNTs) photothermal material with paraffin/expanded graphite. A flat-plate collector based on this material is also designed. Unlike traditional collectors that integrate phase change materials, the composite phase change material in this design can directly absorb sunlight and store heat. The goal is to reduce heat loss from the collector and improve system stability and efficiency. The novelty of this study lies in the preparation of a composite phase change material with high photothermal conversion efficiency, high thermal conductivity, and good shape stability. This material can realize the integration of photothermal conversion and thermal energy storage inside the collector. Key results show that when the CuS-CNTs content is 10%, the photothermal conversion efficiency of the composite phase change material increases from 61.07% to 94.03%. The total efficiency of the solar water heating system reaches as high as 56%. These results indicate that the addition of CuS-CNTs can significantly improve the photothermal conversion efficiency of the material. The prepared composite phase change material has great application prospects in the field of solar energy. In addition, this work uses numerical simulation for analysis. The optimal parameter combination for the collector is determined as an upper layer material density of 0.8 g/cm 3 , a lower layer material density of 0.8 g/cm 3 , and a thickness ratio of 1:1. These findings provide reference and guidance for the structural design of high-performance flat-plate collectors.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
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IF 5.4
Juanjuan Wang,Yang Cao,Shaoyi Li,Yunxiao Wen,Jian Yang
Carbon-based electrocatalysts exhibit excellent oxygen reduction reaction (ORR) activity. Their abundant porous structures and diverse active sites provide accessible mass transfer channels and high current densities during electrocatalysis. Herein, a series of polyhedral porous carbon materials integrated with N-doped carbon nanotubes (CNTs) were fabricated by pyrolyzing precursors under an Ar atmosphere. These precursors were obtained by selectively pre-etching ZIF-8, followed by immersion in Fe ions. The amount of etching agent and Fe during precursor preparation significantly influenced the morphologies and the abundance of CNTs. The optimized sample, denoted as FeN x /Fe@NC-20:6, displayed abundant CNTs intimately connected to the polyhedral porous carbon. It delivered a half-wave potential of 0.92 V ( vs . RHE) and a limiting current density of 5.2 cm −2 for ORR. Furthermore, Zn-air batteries assembled with the FeN x /Fe@NC-20:6 catalyst demonstrated outstanding discharge performance, with an open-circuit voltage of 1.522 V, a specific capacity of 803 mAh g −1 , and a peak power density of 197.4 cm −2 . Therefore, the pre‑etching strategy represents an effective route to design high‑performance, non‑precious‑metal ORR catalysts, thereby facilitating the development of sustainable energy devices. Download: Download high-res image (248KB) Download: Download full-size image Acid-etching of ZIF-8 is an interesting strategy for promoting the CNTs growth via the Fe ions injecting in the precursor. The obtained hybrid catalyst with polyhedral porous and CNTs exhibits excellent ORR performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
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IF 5.518
Xiaoyin Cao,Lijuan Yang,Jie Cui,Qibiao Feng,Chengjun Wang,Zhaoqi Zhu,Hanxue Sun,Jiyan Li,Weidong Liang,An Li
The fabrication of composite phase change material (CPCM) with splendid light-to-thermal conversion efficiency and enhanced thermal conductivity is of significance for solar energy storage and transition. Hence, we report the creation of a novel CPCM prepared by impregnating 1-hexadecanamine (HDA) into nickel foam (NF) bearing with carbon nanotubes (CNTs) nanoarray via simple vacuum impregnation for photothermal conversion. The NF bearing with CNTs nanoarray employed in this study show outstanding light absorption of higher than 97% originated from its vertical aligned CNTs nanoarray which makes it possible for trapping the light to the most extent. Moreover, the metal nature of NF coupled with the carbon nature of CNTs nanoarray endow it excellent thermal conductivity, e.g. the thermal conductivity of CPCM is improved by 46.3% compared to that of the pure HDA. Thanks to the high latent heat of HDA (240 J/g), the latent heat of the CPCM are measured to be 132.2 J/g. In addition, it shows excellent thermal stability, e.g. the latent heat of the CPCM remains nearly unchanged after 50 times of melting/freezing cycles. Beneficial from their outstanding light absorption, excellent thermal conductivity and high latent heat, the as-prepared CPCM is an ideal platform solar energy harvesting , storage and transition. Under 1sun irradiation, the light-to-thermal conversion efficiency of the CPCM was measured to be 80.10%. Moreover, we detected the temperature-time curve of the CPCM under 30 V voltage, the result show that the CPCM also has great potential in the electro-to-thermal conversion application.
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高影响因子
危险品化学品经营许可证（带存储）