MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Xue Wang,Mengjia Li,Shuang Yang,Xuting Bai,Jiajia Shan
p -Nitrophenol ( p -NP) is an important phenolic environmental pollutant. The development of novel rapid determination methods for p -NP is of significance for environmental monitoring. In this work, a sensitive electrochemical sensor based on Ti 3 C 2 T X MXene/graphene composite was developed to detect p -NP in aqueous samples. Firstly, delaminated titanium carbide (D-Ti 3 C 2 T X ) was successfully prepared via an optimized minimally intensive layer delamination (MILD) method, which was further followed by the self-assembly method to form D-Ti 3 C 2 T X /graphene (D-Ti 3 C 2 T X /GR) composite. The prepared materials were characterized by scanning electron microscopic (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM) and Raman spectroscopy. Then the glassy carbon electrode (GCE) was modified by D-Ti 3 C 2 T X /GR composite to prepare the D-Ti 3 C 2 T X /GR/GCE sensor. The electrochemical behavior of D-Ti 3 C 2 T X /GR/GCE was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronocoulometry. Furthermore, the proposed sensor showed a strong electrochemical response based on the p -NP reduction reaction, benefiting from abundant active sites, fast electron transfer, and excellent electro-catalytic performance of the D-Ti 3 C 2 T X /GR composite. Under the optimal conditions, the D-Ti 3 C 2 T X /GR based electrochemical sensor displayed a linear response in the p -NP concentration range from 1 to 175 μmol·L −1 with a detection limit of 0.16 μmol·L −1 . The anti-interference performance, reproducibility, stability, and recovery in real sample analysis were also further evaluated. This study provided a novel and sensitive method for the rapid determination of p -NP in environmental samples.
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高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Sha Lyu,Te Zhao,Yanjing Wang,He Han,Tao Li,Chentao Zhang,Dandan Li,Jaw-Kai Wang,Jintao Huang,Peng Yu,Dazhi Sun
Effective electromagnetic interference (EMI) shielding materials have garnered substantial interest for their efficacy in attenuating electromagnetic wave energy, ensuring data confidentiality, ensuring the operational stability of fragile electronic systems. To begin, artificially cultured diatom frustules (DF)-derived porous silica (DFPS) skeletons were constructed as templates in this study. Porous ceramics hot-pressed at 800 °C displayed a high compressive strength with a high specific surface area due to their three-dimensional (3D) multilayered and porous structures. Then, mechanically robust Ti 3 C 2 T x /DFPS composites with exceptional EMI shielding performance were fabricated by immersing porous DF-based ceramics into Ti 3 C 2 T x solutions and annealing in an argon environment to increase the materials’ shielding efficiency (SE). The EMI SE of composites hot-pressed at 800 °C achieved the maximum EMI SE of 43.2 dB in the X-band and a compressive strength of 67.5 MPa, establishing a hitherto unreported balance of mechanical characteristics and shielding performance. Prolonged transmission paths, multiple dissipation, scattering and reflection of electromagnetic energy were achieved using a well-maintained hierarchical porous silica framework decorated with MXene , with adsorption caused by surface MXene serving as the primary shielding mechanism for the composites. Due to their superior overall performance, MXene/DFPS EMI shielding composites have a bright future in the aircraft sector as delicate electronic device components.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Di Zhang,Bing Zhao,Lijie Liu,Hao Tang,Xiangxue Wang,Shujun Yu
Although two-dimensional transition metal carbides and carbonitrides (MXenes) are becoming increasingly popular in contaminant remediation field, the preparation of MXene nanosheets that can efficiently eliminate the target pollutants still deserves in-depth investigation. Here we produced amidoxime Ti 3 C 2 T x nanosheets (TC-AO), which were efficient radionuclide adsorbents with high stability and positive affinity, by introducing the amidoxime group into the Ti 3 C 2 T x MXene surface through grafting by diazonium salt. The high stability and abundant functional groups of TC-AO were demonstrated by different characterization techniques such as scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and X-ray photoelectron spectroscopy (XPS). Multiple factors affecting the radionuclide removal performance were explored, including reaction time, temperature, pH, ionic strength, anions and cations. The experimental results demonstrated that the radionuclide uptake by TC-AO was a heat-absorbing, spontaneous single-molecule chemisorption process and was consistent with the pseudo-secondary and Langmuir models. When pH < 6, the mechanism of uranium removal was inner complexation, and as the pH continued to increase, uranium removal shifted to outer complexation. Furthermore, the results certificated that TC-AO exhibited fast reaction kinetics (reaching equilibrium in about 20 min), excellent removal efficiency (279.57 mg U·g −1 and 73.99 mg Eu·g −1 ), outstanding selectivity and good stability. The studies showed that TC-AO had good stability and functionality, which was not only valuable for the design of MXene based adsorbents, but also provided a meaningful option for the extraction of radioactive pollutants from wastewater.
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高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Xuan Jian,Mi-mi Zhang,Rui Li,Jian-xin Liu,Feng Fu,Zhen-hai Liang
The grand challenge in the development of Platinum (Pt)-based electrocatalytic hydrogen evolution reaction (HER) catalyst is their high-cost, low utilization and less controllable, limiting its wide application in hydrogen economy field. Therefore, exploring a new technique to construct catalyst require minimal amounts of Pt and maintain high performance is very necessary. Herein, we first designed a high-efficiency electrocatalyst based ultralow Pt loading (1.27 μg cm ‒2 ) on two-dimensional Ti 3 C 2 T x MXene support by controlling Cu monolayer underpotential deposition (UPD), and then galvanic replacement Cu monolayer with Pt. Due to the energetically favorable metal-support interaction, in acidic media the as-prepared Pt-Ti 3 C 2 T x MXene catalyst achieved a current density of 10 mA cm ‒2 at low overpotential of 30 mV. Furthermore, the Pt-Ti 3 C 2 T x MXene catalyst also exhibited a superior HER activity with high turnover frequency (TOF) of 41.8 s ‒1 and mass activity of 41.3 A mg Pt –1 , which were about nearly 47 times those of commercial 20 wt% Pt/C catalyst, respectively. This work demonstrate the potential of Ti 3 C 2 T x MXene as support for design of ultralow Pt loading electrocatalyst through Cu UPD-Galvanic replacement method that can be used for a wide range of catalytic reaction .
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Linshan Zhang,Deshun Huang,Pengxiang Zhao,Guozong Yue,Luming Yang,Weihua Dan
As a novel two-dimensional material, MXene is considered as a good candidate for pollutants removal. In this report, Ti 3 C 2 T x MXene nanosheets suspension was synthesized by intercalating and delaminating of the multi-layered Ti 3 C 2 T x using tetramethylammonium hydroxide (TMAOH). Given to its unique properties, it showed excellent performances on cationic methylene blue (MB) adsorption. The maximum adsorption capacity was figured to be 1026 mg/g at 318 K, which is much higher than most absorbents reported in previous studies. Mechanistic studies revealed that electrostatic attraction and ion exchange are the main factors for MB removal. Additionally, the Ti 3 C 2 T x MXene nanosheets composite membrane was prepared and applied to the MB removal through filtration, which showed good removal efficiency and dye water flux. The current Ti 3 C 2 T x MXene suspension should be a promising absorbent for MB removal from water.
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高影响因子
Science Bulletin
·
2023
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IF 18.9
Weikang Wang,Yan Bai,Pin Yang,Shuai Yuan,Feiyang Li,Weiwei Zhao,Beibei Jin,Xuan Zhang,Shujuan Liu,Daqiang Yuan,Qiang Zhao
Chemical transformation strategy is capable of fabricating nanomaterials with well-defined structures and fascinating performance via controllable crystallization kinetics in the phase transformation. V 2 CT x MXene has been used as precursors to fabricate vanadium porphyrin metal–organic frameworks (V-PMOFs) via the coordination of deprotonated carboxylic acid ligands. However, the rational and in-depth exploration of synthesis mechanism with the aim of enriching the variety of MXene (i.e., Ti 3 C 2 T x ) and organic ligands (i.e., catechol-based) to design new MOFs is rarely reported. Herein, we have first developed a metal ion assistant transformation strategy to synthesize three-dimensional catechol-based TiCu-HHTP (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) MOFs with a non-interpenetrating SrSi 2 ( srs ) framework using two-dimensional Ti 3 C 2 T x as precursors. The unique synergetic transformation mechanism involves the electron transfer from Ti 3 C 2 T x to electrostatically adsorbed Cu 2+ ion for redox reaction , the subsequent Ti–C bond rupture for Ti 4+ ion release , and the continuous chelation coordination between Ti 4+ /Cu 2+ and HHTP. Ti 3 C 2 T x precursors and auxiliary metal ion could be rationally substituted by V 2 CT x and M n + (e.g., Ni 2+ , Co 2+ , Mn 2+ , and Zn 2+ ), respectively. This strategy lays the foundation for the design and synthesis of innovative and multifarious MOFs derived from MXene or other unconventional metal precursors .
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Dongjie Jia,Xianyu Li,Rongyan Cai,Bochao Ma,Qixian Zhao,Tonglin Chigan,Peipei Yang
Two-dimensional MXene and its composites are among the most attractive electromagnetic wave absorption (EMA) materials due to their unique structure. While previous studies have investigated 2D/2D MoS 2 /Ti 3 C 2 T x heterojunctions for EMA, there is still a need for further adjustments to interface structure to enhance polarized electron density and electron transfer capacity. In this study, Cl-Ti 3 C 2 T x was prepared by Lewis acid molten salt etching of Ti 3 AlC 2 , and S-Ti 3 C 2 T x was prepared by replacing Cl with S. MoS 2 nanosheets were grown on the surface of S-Ti 3 C 2 T x by a simple hydrothermal method, forming a Ti-S-Mo covalent interface. The EMA properties of the composites were further optimized by adjusting the interface oriented polarization and electronic structure through Ni doping. Compared to MoS 2 /TiO 2 /Ti 3 C 2 T x , the electromagnetic wave absorption performance of Ni-MoS 2 /TiO 2 /Ti 3 C 2 T x had been significantly improved. When the Ni doping amount was 0.086 mmol, the minimum reflection loss of Ni-MoS 2 /TiO 2 /Ti 3 C 2 T x could reach −48.04 dB at 8.64 GHz, with an effective absorption bandwidth of 3.28 GHz. This study provides theoretical basis and experimental evidence for the follow-up research of MXene-based composite EMA materials.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
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IF 6.2
Jinglun Guo,Zhenling Shang,Yue Sun,Chenghao Li,Jianyi Xia,Yuxin Zou,Kang Du,Guoqiang Liu,Feng Zhou,Weimin Liu
Perfluoropolyether (PFPE) lubricant is widely used in plenty of cutting-edge technologies because of its extraordinary properties. However, poor boundary lubrication and creep limit their further applications. Here, we demonstrated a PFPE supramolecular gel with surface-functionalized Ti 3 C 2 T x as additives for highly efficient boundary lubrication and prevention of creep. It turned into an oily liquid at 124.5 °C, accompanied by a rapid decrease in viscosity. Additionally, the phase transition could be achieved by shear stress. This kind of gel reduced wear volume by 90.75% compared with pure PFPE oil. Its friction coefficient (∼0.113) varied slightly with time. Notably, its load-bearing capacity exceeded 1500 N. This work puts forward an approach to the preparation of PFPE-based supramolecular gel lubricant with surface-functionalized Ti 3 C 2 T x additive.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2023
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IF 8.9
Yuxuan Zhang,Jun Luo,Biao Feng,Hongxia Xu,Yuanyuan Sun,Xueyuan Gu,Xin Hu,Mu Naushad,Bin Gao,Hongqiang Ren
MXenes are considered as an emerging class of two-dimensional (2D) adsorbent for various environmental applications. In this work, two different morphologies of Ti 3 C 2 T x MXene (multilayer (ML-Ti 3 C 2 T x ) and delaminated titanium carbide (DL-Ti 3 C 2 T x )) were prepared through mild in situ HF etching and further delamination . The structural differences between the two were explored with a focus on their effects on the performance and mechanism of removing heavy metals from water. In comparison to ML-Ti 3 C 2 T x , DL-Ti 3 C 2 T x had more oxygen-containing functional groups, higher specific surface area (19.713 vs. 8.243 m 2 /g), larger pore volume (0.135 vs. 0.040 cm 3 /g), higher maximum Pb(II) adsorption capacity (77.0 vs. 56.68 mg/g), but lower maximum Cu(II) adsorption capacity (23.08 vs. 55.46 mg/g). Further investigation revealed that the removal of Pb(II) by the MXenes was mainly controlled through electrostatic attraction and surface complexation mechanisms, while Cu(II) was removed mainly through surface reduction by Ti-related groups. Because delamination of ML-Ti 3 C 2 T x increased the surface area and surface functional groups, DL-Ti 3 C 2 T x became a better sorbent for Pb(II) in water. During sonication, however, delamination inevitably led to partial oxidation of Ti 3 C 2 T x nanosheets and thus weakened the reducing ability of DL-Ti 3 C 2 T x for Cu(II) in water. Nevertheless, both ML- and DL-Ti 3 C 2 T x not only exhibited excellent heavy metal adsorption capacity under different solution conditions, but also showed good reusability. Findings of this study indicate that Ti 3 C 2 T x MXenes are promising adsorbents for treating heavy metal pollutants in water.
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PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2023
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IF 5.4
Wenhu Jia,Huaijie Cao,Tiange Wang,Yulin Min,Qunjie Xu
Two-dimensional (2D) materials show potential applications in anti-corrosion on metals in aggressive medium. However, it remains a challenge in uniform dispersion, complex functionalization, and structure control of 2D nanosheets in composite coatings . Herein, a Ti 3 C 2 T x /layered double hydroxide (LDH) heterostructured coating for corrosion protection on Al alloy is proposed by in situ growth and dip coating process . Without complex functionalization, dispersion, and structure control, the heterostructured coating provides an enhanced corrosion resistance confirmed by electrochemical tests and microstructure characterization . As a result, the incorporation of Ti 3 C 2 T x MXene can decrease the corrosion current density by ~40-fold and increase the coating resistance by 54-fold compared to bare Al alloy. Furthermore, the Ti 3 C 2 T x /LDH coating still exhibits a self-healing ability after immersion in 3.5 wt% NaCl solution over 3 days, thereby providing long-term corrosion protection on Al alloy for 30 days. The protective behavior is attributed to the blocking effect and the feature of participating in electrochemical corrosion reaction and losing electrons of 2D MXene prior to the metal. This strategy provides a facile and effective approach to designing 2D materials-based anticorrosion coatings on Al alloy used in aggressive environments.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Chunli Hou,Huangzhong Yu,Chengwen Huang
The optimized electron transport layer (ETL) plays a crucial role in the practical application of polymer solar cells (PSCs). Herein, bio-inspired polydopamine (PDA) modified Ti 3 C 2 T x (PDA-Ti 3 C 2 T x ) as a multifunctional additive is dispersed into ZnO to fabricate ZnO:PDA-Ti 3 C 2 T x composite ETL. PDA-Ti 3 C 2 T x passivates the trap states of ZnO via forming strong and stable chelate interactions through Zn 2+ ions and PDA molecules. PDA-Ti 3 C 2 T x also lowers the vacuum level of transport layer by forming interface dipoles between catechol of PDA and Zn 2+ ions of zinc oxide. Moreover, PDA-Ti 3 C 2 T x constructs additional electron transport pathways by connecting the discontinuities among ZnO nanocrystals . As such, ZnO:PDA-Ti 3 C 2 T x composite ETL, with higher conductivity and proper work function, can effectively collect electrons in the PSCs. Compared with ZnO control devices, the performance of PSCs with ZnO:PDA-Ti 3 C 2 T x ETL is obviously enhanced with power conversion efficiencies (PCEs) from 10.34% to 12.07% based on PBDB-T:ITIC, 14.84–16.69% based on PM6:Y6, and 8.14–9.41% for PTB7:PC 71 BM, respectively. The ambient stability of the PSCs with ZnO:PDA-Ti 3 C 2 T x ETLs is significantly improved due to the increased hydrophobicity of ETL and the enhanced crystallinity of active layer. The novel ETLs provide a facile, eco-friendly, low-cost approach to realize the highly performance and stable PSCs.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Niandu Wu,Wenhua Zhao,Boye Zhou,Yizhang Wu,Wentao Hou,Wei Xu,Jun Du,Wei Zhong
Ti 3 C 2 T x (MXene) has intriguing application potential for supercapacitors. However, it usually suffers from self-accumulate and restack, resulting in the decrease of electrochemical active sites and low capacitance. Here, we demonstrated a 3D nitrogen-doped Ti 3 C 2 T x /rGO (NTG) foam which was synthesized through the multistep of gelation assisted with urea, freeze-drying, and thermal treatment processes. The decomposition of urea can not only change the morphology, bringing out more open marco- and microporous structures, but also improve the conductivity due to the nitrogen doping in the matrix. The 3D porous architecture can expose more electrochemical active sites, and thus accelerate the transport/diffusion of electrolyte ions. Consequently, the NTG foam possesses a high specific capacitance of 463 F g −1 , good rate performance, and outstanding cycling stability (90.8% retention after 10 000 cycles) in H 2 SO 4 electrolyte, showing enhanced performance of supercapacitors in comparison with pure Ti 3 C 2 T x and Ti 3 C 2 T x /rGO electrode.
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高影响因子
危险品化学品经营许可证（带存储）