SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Markos Medhin Ashebo,Ningning Liu,Fei Yu,Jie Ma
MXene, show a promising electrode material for capacitive deionization (CDI) due to their elevated conductivity and hydrophilic surface characteristics. Despite optimal electrochemical reaction conditions, MXene still exhibits unsatisfactory capacity. Enhancing capacitance in Nb 2 CT x MXene poses a key challenge, and addressing this involves leveraging pseudocapacitance through increased active site concentration. This study reports a method to notably improve the capacitance by incorporating cation intercalation and surface modification. After alkali treatment and thermal annealing, the obtained 400-KOH-Nb 2 C as a cathode in capacitive deionization, exhibiting notable salt adsorption capacity of 104.2 mg g −1 at 1.6 V and an efficient removal rate of 1.73 mg g −1 min −1 , cyclic stability maintained over 200 cycles. This optimized electrochemical and desalination performance is due to the large interlayer spaces of Nb 2 CT x and the surface with lowest termination of -F and –OH group, promoting the delicate surface of Nb 2 CT x MXene and accelerating ion transport. Furthermore, the derivation of KNbO 3 nanowires on 400-KOH-Nb 2 C surface further expands the layer spacing of MXene and enhances the active sites, and also acts as a protective layer to improve the stability of Nb 2 C, this effectively addressing challenges associated with desalination. This study offers a novel solution for improving Nb 2 CT x MXene electrochemical properties in CDI.
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Small
·
2025
·
IF 12.1
Mingli Qin,Jiale Ai,Artem V. Kuklin,Ruijun Zhang,Jiahui Hou,Yiming Zhao,Han Zhang,Jian Zhang,Hans Ågren,Lingfeng Gao,Youju Huang
As a typical hetero-MXene, Ti 3 CN MXene has attracted great attentions owing to its ultrafast carrier dynamic and unique nonlinear optical response. However, the photo-response of pristine Ti 3 CN is unsatisfied due to the fast carrier recombination. Herein, multi-layer Ti 3 CN MXene is modified with well-dispersed Bi quantum dots, where the Ti 3 CN@Bi heterojunction can not only tune the optical absorption but also introduce energy transfer channels. The built-in electric field endows Ti 3 CN@Bi self-powered response behavior and the performance can be further enhanced by tuning external conditions. As demonstrated, the Ti 3 CN@Bi-based photodetectors exhibit high photocurrent density (18.24 µA cm −2 ) and excellent photoresponsivity (18.32 mA W −1 ). In addition, the device shows fast response and outstanding stability (0.002% for each cycle), holding great potentials for practical applications. Hence, this work not only highlights the broad prospects of MXene-based heterojunction, but also provides great value for other optoelectronic device applications.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Mengjie Wang,Yang Hong,Wenbin He,Qixiang Zhang,Gengchen Yu,Jia Liu,Chen Chen,Li Wen,Dan-Dan Wu,Yongfa Cheng,Chaofeng Zhang,Yanan Ma,Siliang Wang,Yang Yue
Achieving efficient ion transport in thick electrodes remains a fundamental challenge in electrochemical systems with high energy density, primarily due to prolonged diffusion pathways and poorly integrated architectures. Leveraging the nanoconfinement effect, (sub)nanoscale channels can significantly accelerate ion transport kinetics to maximize electrochemical performance. Inspired by the hierarchical network structure of bamboo membrane, a gradient nanoconfined MXene electrode (GNC-MX) is designed, where multiscale interlayer spacing is coupled with in-plane mesopores that bridge adjacent nanoconfined channels, enabling synergistic vertical and horizontal ion migration. Finite element simulations and density functional theory calculations reveal the synergistic optimization mechanism of ion transport via the gradient nanoconfined channels and in-plane mesopores. Compared to pristine MXene, GNC-MX electrodes exhibit substantially enhanced ion transport kinetics and charge storage performance. To optimize the nanoconfined channels, an in situ deprotonation-reprotonation strategy is introduced to strengthen electrostatic repulsion and weaken hydrogen bonding and van der Waals interactions of the MXene interlayer, enabling quasi-permanent expansion of ion transport channels. Furthermore, a scalable group-welding method is developed to fabricate 400 µm-thick electrodes with an ultrahigh areal capacitance of 20.7 F cm −2 , surpassing current MXene-based electrodes. This work provides a scalable and tunable biomimetic platform for advanced ion nanoconfinement in energy storage systems.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-12
·
IF 5.3
Chen Jing,Xue Wenli,Shi Yaqin,Liu Wenjing,Ma Rongfang
An electrochemical sensor based on MXene/PANI/SnO 2 nanomaterials was developed for the detection of 4-aminophenol (4-AP). In situ oxidative growth of PANI on the MXene surface effectively hindered the stacking of the lamellae and increased the specific surface area of the composites. Further complexation of tin dioxide with swelling properties of the structure provided adsorption and catalytic sites for 4-AP. The prepared electrochemical sensor displayed good Linearity in the concentration range 0.50 ~ 115.38 µM and low detection limit (LOD = 0.19 µM). The sensor also had good reproducibility and stability. The MXene/PANI/SnO 2 /GCE sensor was applied to the determination of tablets and Yellow River water, and expressed high recoveries and low relative standard deviations. Graphical
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lianshi Qu,Zhihao Zhao,Zhenyuan Li,Rao Zhang
MXene is a novel two-dimensional nano material with exceptional performance, which can be applied in the fields of energy storage structural materials, optics, catalysis, and sensors etc. However, its synthesis is a challenge to date. From the perspective of environmental friendliness, the method of Lewis salt etching can effectively avoid the use of dangerous reagents and has been seen as a pollution-free economic approach. In this article ZnCl 2 molten salt was chosen as corrosive agent to etch Ti 3 AlC 2 MAX phase and investigated the synthesis mechanism of Ti 3 C 2 Cl x MXene. The influence of main process factor, like raw materials, sintering temperature , and holding time on synthesis product were studied and discussed. The synthesis route was investigated by XRD and thermal analysis. SEM and TEM technology was used to analyze the microstructure and lattice of synthesis product. The results showed that the optimal process conditions: the molar ratio of raw materials was 1:6 (Ti 3 AlC 2 : ZnCl 2 ), the synthesis temperature and holding time were 600～700 °C and 4 h, respectively. Ti 3 C 2 Cl x MXene material prepared by this method has a complete layered structure and uniform composition, and its synthesis mechanism can be concluded to two steps: the first step was the reaction between Ti 3 AlC 2 MAX phase and ZnCl 2 to generate Ti 3 ZnC 2 MAX phase; In the second step, the Ti 3 ZnC 2 MAX phase reacted with the remaining ZnCl 2 to generate Ti 3 C 2 Cl x MXene material.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Wenlong Pan,Lin Xu,Samuel C. Lamont,Yifan Zhang,Jianning Ding,Franck J. Vernerey
We developed a multifunctional wearable sensor that can monitor temperature and take anisotropic strain measurements in real time. The material used in this study consisted of covalently cross-linked N-isopropylacrylamide (NIPAM), Ti3C2Tx MXene nanosheets, and Nanoclay particles. The conductivity of the material was then significantly improved (up to 4.762 S/m) by the addition of Fe3+ ions, which interact with the surface of MXene nanosheets. Moreover, the secondary physical networks created by the nanoclay particles, MXene, and Fe3+ ions provided energy dissipation and improved the critical strain and toughness by 75 and 250%, respectively. After incorporating the hydrogel into a flexible sensor, we discovered and characterized a unique anisotropic resistance when taking measurements at different angles with respect to loading. The developed sensor has great strain sensitivity (gauge factor of 1.28), a fast response time (120 ms), and a broad working strain range (≈ 400%), thus, illustrating promise as a versatile sensor for human signal monitoring.
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Nano-Micro Letters
·
2024
·Vol. 17
·期 1
·1-14
·
IF 31.6
Wang Jiaen,Ming Wei,Chen Longfu,Song Tianliang,Yele Moxi,Zhang Hao,Yang Long,Sarula Gegen,Liang Benliang,Yan Luting,Wang Guangsheng
The introduction of MoS 2 generates a “kill three birds with one stone” effect to the original binary MXene/ANF system: lubrication toughening mechanical performance; reduction in secondary reflection pollution of electromagnetic wave; and improvement in the performance of photothermal conversion.
After the introduction of MoS 2 into MXene/ANF (60:40), the strain and toughness were increased by 53.5% (from 18.3% to 28.1%) and 61.7% (from 8.9 to 14.5 MJ m −3 ), respectively. Fortunately, the SE R decreases by 22.4%, and the photothermal conversion performance was increased by 22.2% from ~ 45 to ~ 55 °C.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lili Cao,Yuxiang Chen,Shane Feng,Yanli Su
To reduce the dielectric loss of MXene/PVDF composites near the percolation threshold, a MnO 2 /MXene hybrid structure was successfully synthesized via an ultrasonic-assisted solution process, and MnO 2 /MXene/PVDF composite films were prepared by a solution casting method. The effects of different amounts of MnO 2 nanorods on the microstructure, thermal stability, dielectric properties and mechanical properties of the composite films were investigated. At 1 kHz, the dielectric constant of 7 wt% MnO 2 /MXene/PVDF is 37.3, and the dielectric loss is as low as 0.05. The electric modulus curve, Nyquist curve and equivalent analog circuit of the composites revealed strong interface polarization and microcapacitance effects in the composites. In addition, the composite films exhibit excellent mechanical properties, and the storage modulus of the composite film loaded with 10 wt% MnO 2 is 1990.5 MPa, which is 3.44 times that of pure PVDF. This study confirms that incorporating MnO 2 nanorods into MXene/PVDF composites is an effective approach for fabricating high-performance dielectric composites.
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Advanced Materials Interfaces
·
2025
·
IF 4.4
Hui Yang,Na Kong,Mia Angela Judicpa,Ken Aldren S. Usman,Jinlong Tao,Joselito M. Razal,Jizhen Zhang,Yanqiu Shao
Real-time tracking of metabolites, ions, and biomarkers in sweat using wearable sensors is crucial for advancing point-of-care testing, where improving the stability of these technologies is a major focus. In this research, a compact, highly sensitive, and stable real-time electrochemical sweat sensor capable of monitoring changes in hydrogen ion concentration is developed. By surface functionalizing Ti 3 CNT x and combining it with a polyaniline film, a small, flexible pH sensor is fabricated to track biochemical reactions by examining sweat pH during exercise and wound healing. The fluorinated alkyl silane-modified surface significantly increases the contact angle, enhancing the sensor's performance. The assembled pH sensor demonstrates pH-sensitivity of −42.91 (pH 11–1) and −40.15 mV pH−¹ (pH 1–11), comparable to transition metal oxide-based sensors. Additionally, it shows good selectivity through continuous addition and separated solution methods. The modified Ti 3 CNT x exhibited excellent durability in different ionic solutions for over 30 days. The flexible, precise sensor, developed via scalable screen-printing, can be applied in water quality monitoring, food preservation, product processing, biomarker monitoring, and human health.
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ACS Sensors
·
2025
·
IF 9.1
Wenbin Ren,Jinfeng Luan,Liang Yin,Huijuan Chen,Changchun Wang,Pinhua Zhang,Guangliang Cui,Li Lv
The development of real-time trace-level NO2 quantification platforms that can be operated at room temperature constitutes a critical advancement for occupational safety and public health monitoring systems. This study demonstrates a room-temperature NO2 sensor using MXene–Cu2O composites prepared via a hydrothermal method. Systematic evaluation of MXene-introduced effects identified the 0.84 wt % MXene–Cu2O composite as optimal, exhibiting 4-fold enhanced sensitivity and shorter response (55 s)/recovery (35 s) time compared to pure Cu2O. Additionally, the sensor exhibits a low detection limit (10 ppb), high selectivity, great reversibility, and long-term stability. The enhanced sensing performance originates from precisely engineered interfacial architectures between MXene and Cu2O, which effectively adjust the charge-transfer behavior through the conduction tunnel in the sensing material. Furthermore, oxygen vacancy engineering creates defect-mediated adsorption centers that promote selective NO2 chemisorption through charge polarization effects. This research offers a novel strategy for designing optimized structures to enhance the sensitivity of MOS-based materials for NO2 gas detection.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Rongming Xu,Jingyue Zhang,Yuan Kang,Hang Yu,Weiming Zhang,Ming Hua,Bingcai Pan,Xiwang Zhang
Artificial ion channel membranes hold high promise in water treatment, nanofluidics, and energy conversion, but it remains a great challenge to construct such smart membranes with both reversible ion-gating capability and desirable ion selectivity. Herein, we constructed a smart MXene-based membrane via p-phenylenediamine functionalization (MLM-PPD) with highly stable and aligned two-dimensional subnanochannels, which exhibits reversible ion-gating capability and ultrahigh metal ion selectivity similar to biological ion channels. The pH-sensitive groups within the MLM-PPD channel confers excellent reversible Mg2+-gating capability with a pH-switching ratio of up to 100. The mono/divalent metal-ion selectivity up to 1243.8 and 400.9 for K+/Mg2+ and Li+/Mg2+, respectively, outperforms other reported membranes. Theoretical calculations combined with experimental results reveal that the steric hindrance and stronger PPD-ion interactions substantially enhance the energy barrier for divalent metal ions passing through the MLM-PPD, and thus leading to ultrahigh mono/divalent metal-ion selectivity. This work provides a new strategy for developing artificial-ion channel membranes with both reversible ion-gating functionality and high-ion selectivity for various applications.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Xiaoyu Jia,Yuan Du,Fanyu Xie,Binze Lin,Hui Cao,Hongwei Li,Mei Zhang
Fiber-typed supercapacitors are promising energy storage devices for wearable electronics, and the microstructure of graphene fiber electrodes for flexible supercapacitors plays a significant role in the ion diffusion efficiency and energy density improvement. In this paper, we report a coaxial microfluidic spinning technology, ammonium bicarbonate solution as the core flow, and graphene oxides and MXene quantum dots (MQDs) composite spinning dispersion as the sheath flow to fabricate the hierarchical porous MQDs/graphene composite fibers (MQDs@PGF). 0D MQDs as electrochemically active materials were intercalated into graphene nanosheets; the ammonium bicarbonate solution acts as a foaming agent to realize a hierarchical porous structure of micro-meso-macroporous and a large specific surface area (68.8 m2 g–1), which greatly shorten the ion diffusion channels and provide more electrochemically active sites. The assembled fiber-typed supercapacitors (MQDs@PGF FSCs) exhibit a high specific areal capacitance of 1288 mF cm–2 and maintain a high capacitance retention of 95% after 9000 cycles. The MQDs@PGF FSCs achieve an excellent energy density of 147.5 μWh cm–2 under a wide operating voltage window of 0–2.5 V and successfully power small electronic devices. This method provides a strategy for the controllable design of high-performance fiber electrode materials and promotes energy storage applications in wearable portable devices.
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