Molecular Catalysis
·
2024
·
IF 3.9
Lei-Xin Mao,Lin Fu,Xin-Yu Zhang,Zhi-Feng Yan,Zhi-Hua Gao,Lei Liu,Wei Huang,Zhi-Jun Zuo
The direct methanol fuel cells still recognize Pt and Pd as efficient catalysts for the methanol oxidation reaction (MOR). Our previous study demonstrated the high activity and stability of the Mo 2 C/MWCNT catalyst for electrocatalytic MOR. To further enhance the performance of Mo 2 C/MWCNT, the second metals (Ni and Co) are introduced onto Mo 2 C/MWCNT. It is found that Ni-Mo 2 C/MWCNT exhibits the highest electrocatalytic MOR activity, with a current density of 192 mA cm −2 in 1 mol/L(M) KOH + 1 M CH 3 OH electrolyte at 0.6 V (vs. Hg/HgO). Additionally, the stability of Mo 2 C/MWCNT significantly improves after Ni doping (85.61 % vs. 76.19 %). Characterization results reveal a strong interaction between Ni species and Mo 2 C, with some Ni ions doping into Mo 2 C. Furthermore, the Ni-Mo 2 C nanoparticles are evenly dispersed on MWCNT , with nanoparticle sizes ranging from 5 to 10 nm. DFT results indicate a charge transfer from Mo 2 C to Ni, resulting in the shift of the d-band center of the surface away from the Fermi level. Moreover, the interface charge transfer resistances of Ni- Mo 2 C/MWCNT significantly decreased (7.2 vs. 20.0 Ω). As a result, the electrocatalytic MOR activity on Ni- Mo 2 C/MWCNT improved compared to Mo 2 C/MWCNT.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Qing Xuan Shi,Chen Chang,Hui Jie Pei,Xin Guan,Liang Liang Yin,Xiao Lin Xie,Yun Sheng Ye
The lithium–sulfur (Li–S) battery holds great promising for the next-generation energy storage system due to its high theoretical specific capacity and energy density . However, the poor conductivity of sulfur species and the “shuttle effect” of polysulfides (PSs) severely limit the practical application of Li–S battery. Here, a large-scaled covalent triazine framework/multiwall carbon nanotube (CTF/MWCNT) hybrid used as a multi-functional separator modifier combining strong PSs-anchor ability of CTF with high electrical conductivity of MWCNT was proposed. The ordered porous structure and large specific surface area of CTF make it good physical trap ability for PSs shuttle, and the abundant pyridinic nitrogen groups of CTF render it effectively adsorb PSs by chemical sorption , while the high electrical conductivity of MWCNT can facilitate electron transfer . As it turns out that the multi-functional separator applied in Li–S battery shows significant enhancements in the utilization of sulfur, specific capacity, Columbic efficiency, rate capability (982 mAh g −1 at 2 C) and cycling stability (0.045% specific capacity loss per cycle at 1 C along 1000 cycles) as well as suppression of self-discharge and Li dendrite growth. Furthermore, it is practicable to incorporate the slurry cast multi-functional layer onto the commercial separator, which provides ideas for constructing advanced multi-functional separators for commercially viable Li–S battery.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Xi Lin,Chenchen Wang,Chaoqun Zhang,Chuanshuang Hu,Yi Yang,Yonghui Zhou,Xiuyi Lin,Jiangtao Xu
Inadequate interfacial polarization relaxation and insufficient synergy between magnetic and dielectric loss mechanisms constitute a major bottleneck impeding the advancement of wave-absorbing materials. This work proposes a carboxylated multiwall carbon nanotube (c-MWCNT) bridging strategy to construct c-MWCNT@Fe3O4–PPy@BNC composite aerogels (FCPB). Leveraging carboxyl–Fe3+ coordination and synergizing with PEG, c-MWCNT induces the formation of mesoporous Fe3O4. This strategy simultaneously enables the development of a 3D conductive network and improves interfacial compatibility with PPy@BNC, fostering the creation of continuous heterogeneous interfaces. Under microwave/terahertz irradiation, the heterogeneous interfaces prompt electron rearrangement due to differences in electrical conductivity and energy levels among components, thereby strengthening interfacial polarization. The optimal FCPB11 aerogel exhibits exceptional microwave absorption performance in the 2–18 GHz band, achieving a minimum reflection loss (RL) of −68.51 dB at 2.14 mm and an effective absorption bandwidth (EAB) of 6.97 GHz at 1.99 mm. Moreover, in the terahertz range (0.1–4.5 THz), it delivers a maximum RL of 44.2 dB and an EAB of 4.01 THz. Cole–Cole curves and DFT simulations further confirm the presence of multiple polarization relaxation processes, while CST simulations demonstrate a minimum radar cross-section of −44 dB m−2. Importantly, the aerogel maintains high microwave-absorbing performance even after exposure to acid, alkali, and high-temperature treatments. This study provides a new strategy for designing green, broadband, and high-performance microwave absorbers.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2018
·Vol. 22
·期 11
·3485-3491
·
IF 2.509
Su Danyang,Wang Jing,Yang Zhao,Liu Shuang,Yang Jinping,Yao Shaowei,Feng Xiaoxin
The self-assembled hierarchical MnCO 3 /MWCNT nanoarchitectures are prepared by a facile solvothermal method and used as anode material for lithium-ion batteries. The results of SEM and TEM show that the hierarchical nanorods are made of the primary MnCO 3 nanocrystals. The hierarchical nanorods MnCO 3 are heterogeneously distributed among retiform MWCNTs. Those MnCO 3 /MWCNT nanoarchitectures are able to buffer the physical aggregation of the MnCO 3 nanorods and volume expansion of MnCO 3 in the charge/discharge process. The self-assembled hierarchical MnCO 3 /MWCNT nanocomposite delivers a reversible capacity of 704 mAh g −1 after 110 cycles at a current density of 100 mA g −1 . The excellent electrochemical performance is attributed to the self-assembled hierarchical MnCO 3 /MWCNT nanoarchitectures and the high conductivity of MWCNTs.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Xiaoqin Wang,Nana Yang,Qiaoqin Li,Fan He,Yufei Yang,Bohua Wu,Jia Chu,Anning Zhou,Shanxin Xiong
In view of the poor electronic conductivity and inferior structural stability, the direct application of Metal-Organic Frameworks (MOFs) as an electrode material is limited. Herein, the carboxylated multi-wall carbon nanotubes (MWCNT) are utilized as a substrate for the in-situ growth of bimetallic NiCo-based MOFs (NiCo-MOF). The flower-string-like NiCo-MOF/MWCNT composites are successfully synthesized using 4, 4′-biphenyldicarboxylic acid (BPDC) as a ligand via a simple solvothermal approach. In the composites, MWCNT is wrapped with 2D NiCo-MOF nanosheets through some bonds or affinity between MWCNT and NiCo-MOF. Meanwhile, the MWCNT presence does not affect the formation of the NiCo-MOF crystals. Compared with the hydrangea-like NiCo-MOF microspheres , the flower-string-like composite structures are more loosely assembled by NiCo-MOF nanosheets. Owing to the guiding effect of MWCNT on the NiCo-MOF growth, many well-dispersed flower-string-like structures can be achieved by adjusting MWCNT dosages. Due to the unique hierarchical structure and good synergistic effect, the NiCo-MOF/MWCNT composites exhibit excellent capacitance performances. The optimal composites demonstrate a large specific capacitance of 1010 F g −1 at 0.5 A g −1 , a good rate capability (760 F g −1 even at 10 A g −1 ), a good cycling stability and reversibility with the capacitance retention of 828 F g −1 (100% of the initial capacitance) and coulombic efficiency of approximate 98% at 5 A g −1 after 3000 cycles, a low internal resistance and charge transfer resistance. The asymmetric supercapacitor assembled by NiCo-MOF/MWCNT composites as electrode materials has high energy density even at high power density, good rate capability, excellent cycling stability and reversibility. Hence, the as-synthesized NiCo-MOF/MWCNT composites are a promising high-performance electrode material for supercapacitors .
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Jiajia Sun,Sheng Feng,Shanshan Feng
A novel ternary heterojunction MWCNT/N-TiO 2 /UiO-66-NH 2 was synthesized by in-situ solvothermal-hydrothermal approach, showing superior photocatalytic degradation of KET under visible-light irradiation. The optimal MWCNT/N-TiO 2 /UiO-66-NH 2 (3:7) composite exhibits the highest degradation efficiency of KET (96%) in 120 min in comparison with pristine TiO 2 , N-TiO 2 , MWCNT , UiO-66-NH 2 and MWCNT/N-TiO 2 . The improved photocatalytic activity of MWCNT/N-TiO 2 /UiO-66-NH 2 can be ascribed to its improved visible-light absorption range, the large specific surface area based on UiO-66-NH 2 as well as the formation of an effective heterojunction. The formed ternary composite facilitates the separation and transfer of photoexcited charge carrier, which is confirmed from the results of PL. The photocatalytic mechanism is further proposed based on the trapping experiment, and the transfer process of photoinduced electron-hole pairs is discussed. This work provides an effective strategy for designing a new ternary photocatalytic system toward degradation of organic pollutants.
研究领域:
材料科学
·
环境科学
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Nanoscale
·
2015
·Vol. 7
·期 8
·3660-3667
·
IF 7.394
Qikai Guo,Qingzhong Xue,Jin Sun,Mingdong Dong,Fujun Xia,Zhongyang Zhang
Novel core/shell structured multi-walled carbon nanotube/amorphous carbon (MWCNT@AC) nanohybrids were successfully prepared using a simple and novel method. Subsequently, the MWCNT@AC nanohybrids were used as fillers to enhance the dielectric properties of poly(vinylidene fluoride) (PVDF) based composites. It is found that the dielectric constant of the MWCNT@AC/PVDF composites can reach 5910 (the dielectric loss is ∼2), which is considerably better than that of MWCNT/PVDF composites. The uniform amorphous carbon shell provides an insulative layer between adjacent MWCNTs in the polymer matrix, which not only prevents the direct contact of MWCNTs but also improves the dispersibility of the MWCNTs. Therefore, a surprising number of microcapacitors could be formed in the composites before the formation of a conductive network, leading to a gigantic enhancement in the dielectric properties. Our strategy provides a new approach to fabricate excellent dielectric materials for energy storage capacitors. In addition, the design concept used in this work can be extended to other carbon materials.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Kezhong Wu,FeiFei Nie,Hui Zhao,Xin Qi,Ping Li,Mingxing Wu
The doped transition metal oxides (TMOs) substitute for the traditional Pt as the counter electrode (CE) catalyst is a unique way to reduce the cost and improve the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). Herein, four different morphologies and size of Fe 2 O 3 (nanodiscus (ND), nanocubes (NC), nanorings (NR), nanoball (NB)) assisted by multi-walled carbon nanotube (MWCNT) to prepare Fe 2 O 3 @MWCNT composites, and then were further utilized in the encapsulated DSSCs. The obtained different morphologies Fe 2 O 3 @MWCNT composites had been characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and N 2 adsorption-desorption. The significant effects of different morphologies of Fe 2 O 3 on the electrochemical activity of Fe 2 O 3 @MWCNT composites as CEs were confirmed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Tafel polarization experiments. The DSSCs using Fe 2 O 3 @MWCNT composites CEs achieved high PCEs of 6.34 (ND), 6.53(NC), 6.65(NR), and 7.09% (NB) to regenerate traditional I 3 − /I − shuttles by the photocurrent-photovoltage ( J - V ) test, respectively, which is due to the synergistic effect between Fe 2 O 3 and MWCNT to improve electrical conductivity and promote a high number of active catalytic sites, implying a remarkable alternative of Pt-free catalyst that can be applied to the encapsulated DSSCs as CEs.
研究领域:
材料科学
·
能源科学
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 31
·期 7
·2008355
·
IF 16.836
Xuemei Fu,Jiaxin Li,Chengqiang Tang,Songlin Xie,Xuemei Sun,Bingjie Wang,Huisheng Peng
Standard fabrication of soft electronic devices with both high controllability and yield is highly desirable but remains a challenge due to the modulus mismatch of component materials through a one-step process. Here, by mimicking the freeze-section process of multicomponent biological tissues containing low-modulus muscles and high-modulus bones, for the first time, a hydrogel cryo-microtomy method to continuously making soft electronic devices based on a sol-solid-gel transition mechanism is presented. Polyvinyl alcohol (PVA) electrolyte and aligned nitrogen-doped multi-walled carbon nanotube (N-MWCNT) array electrode are demonstrated as low- and high-modulus components to fabricate soft supercapacitors with high performances. Stable interfaces form between frozen PVA electrolyte and N-MWCNT electrodes with matched moduli at subzero temperature and are well maintained during cryo-microtomy process. The resulting soft supercapacitors realize controllable patterns, tunable thicknesses from 0.5 to 600 μm, high yields such as 20 devices per minute even at lab scale, and high reproducibility with over 75% devices in 15% performance fluctuation. This cryo-microtomy method is further generalized to fabricate other soft devices such as sensors with high sensing properties.
研究领域:
材料科学
·
电气工程
·
纳米技术
·
生物医学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hanchen Ye,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
The discharge of large amounts of sewage has caused enormous damage to the environment and human health. There is an urgent need for efficient and environmentally friendly materials to deal with such troubles. Materials with emulsion separation have attracted everyone’s attention. In this study, zeolitic imidazolate framework (ZIF)-8- and Co-polydimethylsiloxane (PDMS)-modified multiwalled carbon nanotube films were fabricated. First, the surface of the nanotube films was modified with ZIF-8 by in situ growth, and then a Co-PDMS layer was added by dip coating. The membrane has excellent wettability, and it is superhydrophobic and superoleophilic in air. The separation efficiency of water-in-oil emulsions reaches more than 99.9%, and it has an outstanding separation ability for corrosive emulsions. Moreover, the membrane has an excellent self-healing ability, and it can rapidly heal at normal temperature after being damaged. This makes the film more suitable for practical oily wastewater treatment. We performed related research and propose a possible self-healing mechanism.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Guoping Wang,Tian Tang,Ruichen Liu,Jingwen Li,Yi Xu,Sen Liao
By utilizing carboxylated multiwalled carbon nanotubes (MWCNT-COOH) to strengthen the interaction between the electrode and the analytes and improve the conductivity of the composite material and in conjunction with the superior catalytic properties of copper-based metal–organic framework (MOFs), a novel electrochemical sensor was fabricated from a Cu-MOF/MWCNT-COOH composite, specifically designed for the simultaneous and distinct detection of ascorbic acid (AA) and dopamine (DA). Electrochemical analyses were conducted on the innovative Cu-MOF/MWCNT-COOH electrode through both CV and DPV, revealing unique electrochemical behaviors for AA and DA. The sensor not only showed exceptional electrocatalytic properties but also distinguished itself by its broad dynamic response ranges, covering concentrations from 3 to 1800 μM for AA and from 2 to 180 μM for DA, with detection limits (S/N = 3) of 3.00 μM for AA and 0.32 μM for DA. Furthermore, this electrochemical detection platform exhibited robust reproducibility and selectivity. Examinations of serum samples yielded the recovery rates of AA and DA which were 101.9% and 102.1%, respectively, confirming the sensor’s capability to perform reliably under varied biological conditions. The findings confirm the sensor’s potential of the proposed method for the simultaneous, sensitive, and reliable detection of AA and DA. In conclusion, the electrochemical sensor has a promising potential for practical applications.
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Jiaying Liu,Guang Nie,Shuai Yang,Yanmin Zhang,Ziyun Li,Sitong Wang,Zijian Song,Shuanli Du,Yingchun Li
Semi-aromatic polyamides (SAPAs) are emerging as promising engineering polymers due to their unique combination of high rigidity, thermal stability, and processability. However, pure SAPAs suffer from limited electrical conductivity and multifunctional responsiveness, hindering their application in smart materials and actuators. In this paper, PA5T/56 copolyamides with varying terephthalic acid/adipic acid molar ratios (3/7–7/3) were synthesized via melt polycondensation and characterized mainly by 1 H NMR, FTIR. PA5T/56 (3/7), with the optimal balance of mechanical performance and processability, was selected as the composite matrix. Composites containing different contents of carboxyl-functionalized multi-walled carbon nanotubes (MWCNT-COOH, 0, 5, 10, 15 wt%) were prepared by solution casting. The effects of MWCNT-COOH on the thermal stability, mechanical properties, and especially thermo- and electro-induced shape memory behaviors of the composites were comprehensively investigated. The results show that MWCNT-COOH markedly improves the thermo-induced shape memory at an appropriate loading, with the shape recovery rate reaching 82.8% and the shape fixity rate exceeding 90% at 10 wt% MWCNT-COOH. 15 wt% MWCNT-COOH/PA5T/56 can achieve electro-induced shape recovery via Joule heating within 44 s. Overall, this work establishes the structure–property relationships of PA5T/56 copolyamide with tailored monomer compositions and demonstrates the effectiveness of MWCNT-COOH in imparting thermo- and electro-responsive functionalities.
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危险品化学品经营许可证（带存储）