Journal of Water Process Engineering
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2024
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IF 6.3
Hongwei Wang,Xianliang Ren,Fang Wu,Gaobin Liu,Shufang Zhang,Haijun Luo,Zhiqin Zheng,Liang Fang
MXenes have demonstrated exceptional potential in the adsorption of uranium (U(VI)) from wastewater. However, significant challenges remain in the investigation of its adsorption capacity and mechanism. To enhance the adsorption capacity of Ti 2 CT x , this study conducted alkalization experiments on Ti 2 CT x and subsequently prepared Ti 2 C(OH) 0.13 @SA aerogel spheres by combining alkalized Ti 2 C(OH) 0.13 with sodium alginate (SA). The results indicated that alkalization effectively increased the proportion of OH functional groups. After alkalization treatment, Ti 2 C(OH) 0.13 exhibits a significantly enhanced adsorption capacity, reaching up to 951 mg g −1 , which represents more than a twofold increase compared with untreated Ti 2 CT x . The adsorption follows pseudo-second-order kinetics and the Langmuir isotherm model, suggesting chemical and monolayer adsorption, respectively. Thermodynamic studies reveal an endothermic adsorption process. DFT calculations demonstrate that the OH functional group forms chemical bonds with U(VI), promoting reductive adsorption. Aside from electrostatic adsorption, XPS analysis confirms Ti(II) oxidation and U(VI) reduction. This study further investigates the adsorption capacity of Ti 2 C(OH) 0.13 @SA aerogel spheres in simulated seawater environments. It is found that even at an ultra-low concentration of U(VI) as low as 3.3 μg/L, these aerogel spheres still exhibit significant adsorption performance, with an adsorption capacity reaching up to 3.21 mg g −1 , highlighting their substantial potential for applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Applied Nano Materials
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2022
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IF 6.14
Bao Shi,Lu Chen,Tien-Chien Jen,Xinying Liu,La Li,Aibing Chen,Guozhen Shen
Freestanding and flexible MXene electrodes have exhibited great potential in wearable energy device design through over 10 years of rapid development but are yet limited by the restacking of nanosheets and the complex and lengthy ion transport paths that reduce their performance at high charge–discharge rates. Herein, we provide a molten salt method assisted by a selective etching process for the directional vertical growth of Ti2CTx MXene nanosheets on carbon fiber (CF) substrates, showing several advantages: (1) bifunctional CF, which acts as both a self-supported freestanding flexible substrate and carbon source during the synthesis of the Ti2AlC MAX phase, (2) eliminating the need for collecting the powder Ti2CTx MXene from the acid mixture after the selective etching process and filtration steps to obtain freestanding and flexible MXene films, and (3) the directional vertical arrangement of Ti2CTx shortens the ion diffusion path and the integrated structure of nanosheets and carbon fibers speeds up ion transport. As a result, the fabricated Ti2CTx MXene@CF//Zn@Cu@CF hybrid Zn-ion supercapacitor delivers a high areal capacitance of 380 mF/cm2, an energy density of 52.77 μWh/cm2 at 5 mV/s, excellent stability with 90.06% capacity retention after 10 000 cycles, and 89.76% capacity retention after storing in air for 30 days. The directional vertical Ti2CTx MXene nanosheets can be extended to other application areas, such as sensors, catalysts, detectors, electromagnetic shielding, etc.
研究领域:
材料科学
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电化学
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能源存储
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纳米技术
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DOI
高影响因子
NANOTECHNOLOGY
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2024
·Vol. 35
·期 34
·345402
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IF 2.9
Ruixue Liu,Sainan Wei,Bao Shi,Yizhi Ma,Luning Sun,Wei Wang
The continuous advancements in wearable electronics have drawn significant attention toward 2D MXenes materials for energy storage owing to their abundant availability, adaptability, and distinctive physicochemical properties. Two unresolved concerns currently revolve around environmental pollution by F-containing etching and finite kinetics caused because of re-stacking of nanosheets. In this study, Al was electrochemically etched from porous Ti2AlC electrodes without the use of fluorine, through a selective electrochemical etching process in dilute hydrochloric acid. Subsequently, Ti2CTx MXene was vertically grown on carbon fiber (CF) substrates. The resulting Ti2CTx@CF electrodes are lightweight, thin, and flexible, exhibiting a surface capacitance of 330 mF cm−2 at a constant current density of 1 mA cm−2 after 2000 cycles. They display a surface capacitance retention of 96.16% and a high energy density of 45.3 μWh cm−2 at a power density of 0.497 mW cm−2. These metrics underscore the Ti2CTx@CF electrode's commendable multifunctionality, electrochemical performance, ion transport efficiency, and charge storage capacity. Moreover, a flexible energy storage electrode material with a high area capacity was developed by combining Ti2CTx MXene nanosheets, possessing a large specific surface area, with a flexible carbon fabric substrate.
研究领域:
材料科学
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能源存储
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纳米技术
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DOI
PubMed
高影响因子
ACS Applied Electronic Materials
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2025
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IF 4.7
Jianghao Gan,Jinlin Fan,Zongyu Huang,Hui Qiao,Pinghua Tang,Xiang Qi
Two-dimensional transition metal carbides (MXene) show great promise for use in flexible optoelectronics, but they are prone to rapid oxidation and nanosheet restacking, which can degrade the device performance and longevity. In this study, we address this issue by creating a dual-network conductive hydrogel made up of Ti2CTx MXene and reduced graphene oxide (rGO). The rGO nanosheets act as conductive spacers, preventing the restacking and oxidation of the Ti2CTx nanosheets while enabling charge transport. The resulting Ti2CTx/rGO composite hydrogel achieves an impressive photocurrent density of 0.375 μA cm–2 under a 0.4 V bias and 120 mW cm–2 of illumination. This is 68.2% higher than that of a pure MXene hydrogel (0.223 μA cm–2). Furthermore, the composite demonstrates outstanding mechanical and environmental stability. It retains 79.2% of its photocurrent under 200% tensile strain compared to 53.8% for the pure MXene system and exhibits only a 40% decrease in photocurrent after 15 days, significantly outperforming the 70% decay observed in the control device. This work provides an effective strategy for developing stable, high-performance MXene-based hydrogels for advanced, wearable, optoelectronic applications.
研究领域:
材料科学
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纳米技术
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光电子学
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柔性电子学
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能源材料
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Hailong Xu,Xiaowei Yin,Xinliang Li,Minghang Li,Shuang Liang,Litong Zhang,Laifei Cheng
Lightweight absorption-dominated electromagnetic interference (EMI) shielding materials are more attractive than conventional reflection-dominated counterparts because they minimize the twice pollution of the reflected electromagnetic (EM) wave. Here, porous Ti2CTx MXene/poly(vinyl alcohol) composite foams constructed by few-layered Ti2CTx (f-Ti2CTx) MXene and poly(vinyl alcohol) (PVA) are fabricated via a facile freeze-drying method. As superior EMI shielding materials, their calculated specific shielding effectiveness reaches up to 5136 dB cm2 g–1 with an ultralow filler content of only 0.15 vol % and reflection effectiveness (SER) of less than 2 dB, representing the excellent absorption-dominated shielding performance. Contrast experiment reveals that the good impedance matching derived from the multiple porous structures, internal reflection, and polarization effect (dipole and interfacial polarization) plays a synergistic role in the improved absorption efficiency and superior EMI shielding performance. Consequently, this work provides a promising MXene-based EMI shielding candidate with lightweight and high strength features.
研究领域:
材料科学
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电磁功能材料
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纳米复合材料
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聚合物基复合材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2026
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IF 6
Baoji Miao,Liu Qiang,He Huaizhi,Irshad Ahmad Mir,Jinbo Bai,Fengyun Wang,Muhammad Yasir
High-entropy (HE) engineering presents a promising approach to optimizing the electromagnetic (EM) properties of MXenes for enhanced microwave absorption. In this study, a series of tunable configurational entropy MXenes Ti 2 CT x (MC-1), (Ti 1 / 2 V 1 / 2 ) 2 CT x (MC-2), (Ti 1 / 3 V 1 / 3 Nb 1 / 3 ) 2 CT x (MC-3), (Ti 1 / 4 V 1 / 4 Nb 1 / 4 Ta 1 / 4 ) 2 CT x (MC-4), and (Ti 1 / 5 V 1 / 5 Nb 1 / 5 Hf 1 / 5 Ta 1 / 5 ) 2 CT x (MC-5) are synthesized via selective etching and intercalation of their corresponding MAX phases. The structural and morphological characterization confirms the successful formation of accordion-like high-entropy MXenes. The electromagnetic evaluations demonstrate a significant enhancement in absorption performance corresponding to the increase in M-site entropy. The MXenes MC-4 and MC-5 also exhibit remarkably high performance, achieving minimum reflection losses (RL min ) of −48.5 dB at 8.56 GHz (2.85 mm) and −50.7 dB at 17.04 GHz (4.58 mm), along with effective absorption bandwidths (EAB) of 3.68 GHz and 1.92 GHz, respectively, surpassing their lower-entropy counterparts. Their superior stealth capabilities are further validated through radar cross section (RCS) simulations, which reveal that MC-4 and MC-5 coatings maintained RCS values below −20 dBm 2 across a broad angular spectrum (−60 to 60°), significantly outperforming a perfect electric conductor (PEC) baseline. This performance enhancement is essentially attributed to the entropy-mediated optimization of electromagnetic parameters, which improves impedance matching alongside intensified polarization loss resulting from lattice defects and interfaces. This study confirms that high-entropy design is an effective strategy for advancing high-performance wideband MXene absorbers, holding significant potential for applications in stealth and communication technologies.
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高影响因子
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