ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Yujing Liu,Qi Liu,Chengyao Zhao,Liping Liu,Zhongqiu Liu,Anguo Ying,Zhibin Pang,Xuping Sun,Pu Chen,Guang Chen
Owing to the adverse influences of irreversible oxidation, the development of MXene-based materials, especially those with satisfactory performance and longevity for aqueous energy storage, continues to suffer severe challenges. Herein, the strategy of targeted passivation-supported defect-lock-oxygen is conceived, whereby engineered the V 2 CT x material for controllable partial oxidation with enhanced regioselectivity. When the material works, inside the intrinsic defects, the outward diffusion of oxidation is confined by the Lewis bases around the defects, which allows for the controllable progress of oxidation. The defect-locked oxygen oxidizes the exposed carbon, thus forming sufficient amorphous carbons for enhancing the capacitive-type adsorption of K-ions. Then the oxidized defects enabled the fast kinetics via the cross-layer transport of K-ions. Benefiting from the strategy, the electrode assembly V 2 CT x -RTIL (V 2 CT x equipped with room temperature ionic liquid) exhibits high capacity, good rate capability, and ultra-longevity compared with those of the MXene materials so far reported. This work presents the first strategy of targeted passivation-supported defect-lock-oxygen for high-rate capability and super long-cycling aqueous K + storage and hopefully would provide the inspiration for the future design of novel electrodes.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Mimi Han,Wenhao Shen,Xin Tong,Jean-Pierre Corriou
Two-dimensional (2D) MXene provides large surface area for the adsorption and interaction of H 2 O molecules, which is highly desirable for the construction of humidity-sensing materials. However, the drawbacks, involving easy stacking and poor mechanical strength, pose a huge challenge to its practical application. Herein, inspired by nacred “brick-mortar” nanostructure , a nanopaper humidity sensor made of flexible TEMPO-oxidated cellulose nanofibers/MXene/silver nanowires (TOCNFs/MXene/AgNWs) was developed by vacuum-assisted filtration self-assembly strategy. The synergism of 1D TOCNFs, AgNWs “mortar” and 2D MXene “bricks” endows the nanopaper with superb tensile strength (146.3 MPa), modulus (16.9 GPa), and superior bending durability, and the obtained TOCNFs/MXene/AgNWs nanopaper humidity sensor exhibits high response value of 90% at 97% RH with a low MXene addition of 20 wt%. Furthermore, the unique photothermal response property of MXene accelerates the desorption of H 2 O molecules during sensor recovery, realizing the reversible sensing performance. The proposed humidity sensing mechanism lies in the variation of MXene interlayer d-spacing induced by adsorbing ambient H 2 O molecules and the swelling of TOCNFs. Lastly, the sensor demonstrates the possibilities in human respiration monitoring, non-contact sensing, and humidity actuating.
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MATERIALS CHEMISTRY AND PHYSICS
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2025
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IF 4.7
Wenjuan Zhang,Hanhong Xu,Yuheng Li,Yaxian Wang,Xiangyue Yang,Youliang Wang,Henan Jia,Yongqian Shen,Wei Zhang,Tomasz Wejrzanowski
With the rapid advancement of digital and communication technologies, electromagnetic pollution poses an increasingly serious threat to the environment and precision instruments. In this study we report a three-dimensional MXene/PPy/Fe 3 O 4 (3D MPF) composite with an ordered three-dimensional network structure constructed by an in-situ self-assembly method. The porous structure of 3D MPF was adjusted to induce the assembly of MXene nanosheets through different EDA additions. The 3D MPF exhibits cross-linked and interpenetrating conductive networks that facilitate efficient electron transfer and reflection. The multi-layer heterogeneous interfaces and functional groups of the 3D MPF generate more polarization defects, causing significant reflection and scattering of incident electromagnetic waves. Moreover, the inclusion of Fe 3 O 4 supports magnetic loss and optimizes the impedance matching of the 3D MPF. The 3D MPF exhibits a maximum reflection loss of −55.21 dB at a thickness of 3.31 mm when the ratio of MXene to Fe 3 O 4 is 1:1. At a thickness of 1.41 mm, the effective absorption bandwidth reaches 3.44 GHz (from 13.84 GHz to 17.28 GHz). By adjusting the matching thickness, the effective absorption bandwidth of the 3D MPF ranges from 3.44 GHz to 18 GHz, with reflection losses below −10 dB, indicating its significant potential in electromagnetic wave absorption.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
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IF 20.2
Kexuan Gao,Li-an Hou,Lin Hu,Yiran Chai,Satoshi Takizawa,Nigel J.D. Graham,Zhiqiang Sun,Zhenghua Zhang,Jun Ma,Yu Yang
Two-dimensional (2D) catalytic ultrafiltration membranes, tightly assembled with MXene (Ti 3 C 2 T x ) lamellae and significantly dispersed Co single atoms (∼ 2.4 wt%), were prepared by a simple solvothermal and low-temperature reduction method. The Co-MXene membrane overcomes the conventional trade-off between selectivity and permeability, and demonstrated an instant water purification (100 % carbamazepine degradation within 240 ms) and a high membrane permeability (∼900 LMH/bar). It has been confirmed that coordinatively unsaturated Co-N 1 O 2 accelerated electron transfer and activated the formation of 1 O 2 and high-valent Co-oxo species. Nano-confinement channels assembled by the small-sized lamellae facilitated the transport of water molecules. A stable treatment performance with natural surface water was achieved at 3000 L/m 2 . Good anti-fouling capabilities were also demonstrated with a 96 % alleviation of membrane fouling in the presence of Pseudomonas aeruginosa. These comprehensive mechanistic investigations and stable performances provide a valuable basis for preparing SACs-catalyzed membranes with highly dispersed single atoms and high permeability.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
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IF 2.6
Yan Yue,Wu Wenrui,Tian Xinyu,Wei Chengzhi,Xu Tao,Li Xianfu
Optimizing the performance of layered double hydroxide (LDH) electrodes by MXene is of significant importance for high-performance asymmetric supercapacitors. In this paper, CoAl-LDH nanosheet-doped s-MXene composites were prepared by a facile hydrothermal method, and two-dimensional layered microstructured CoAl-LDH/s-MXene electrode materials with excellent performance were prepared. The homogeneous growth of CoAl-LDH on s-MXene successfully hinders the agglomeration of CoAl-LDH and provides more layered channels for electron and ion transfer across the electrode material. In addition, CoAl-LDH can effectively suppress the stacking of s-MXene, which increases the electrochemical active site of the material, resulting in an increase in specific capacity. The CoAl-LDH/s-MXene electrode material has a high specific capacity of 1259.9 C g −1 at 1 A g −1 , which has outstanding specific capacity and rate capability. The assembled asymmetric CoAl-LDH/s-MXene//AC supercapacitor achieves the desired energy density of 104 and 88 Wh kg −1 at 1500 and 6000 W kg −1 . After 5000 laps at 10 A g −1 , CoAl-LDH/s-MXene//AC has a capacitance retention rate of 86.6% and a coulomb efficiency of nearly 100%, demonstrating its splendid cycling stability. Therefore, this paper adopts a simple hydrothermal method to prepare CoAl-LDH/s-MXene active material, which provides an effective strategy for constructing supercapacitors with excellent performance. Graphical abstract
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Materials Today Sustainability
·
2024
·
IF 7.1
Wentao Huang,Jie Xia,Zhigang Li,Xiaoshuan Zhang
The pursuit of simple, cost-effective, and efficient flexible ammonia sensors is an area of keen interest. This study aimed to create a highly sensitive, affordable flexible sensing patch (FDP) for immediate ammonia and impedance monitoring. Using a laser direct writing technique, symmetrical graphene patterns were crafted onto commercial kapton tape. These patterns were folded in half, allowing the lower layer to serve as an impedance sensor and the upper layer as an electrode for ammonia detection. The modified Ti 3 C 2 T x MXene solution was introduced as the sensitive layer in response to ammonia gas, and we also explored how varying thicknesses of this sensitive layer affected the response results. Notably, the results highlighted that FDPs with two thicknesses (50 μL solution) offered optimal ammonia detection. With a detection limit of 150 ppb, impressive sensitivity (18.08%/ppm), exceptional linearity (0.996), and stability within the 0.5 ppm–20 ppm range, the overall performance of the FDP surpassed that of most reported ammonia sensor devices based on graphene materials. FDP was able to better characterize the shelf life of lamb at a cost of no more than $1.5. This study provides solutions for rapid ammonia detection and food quality assessment .
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Hai Jiang,Jiabo Zhang,Zhiwei Weng,Longyan Chen,Yichuan Wu,Xuan Weng
Flexible strain sensors have been widely used in wearable electronics. However, the fabrication of flexible strain sensors with a large strain detection range, high sensitivity, and negligible hysteresis remains a formidable challenge, even after enormous advancements in the field. Herein, a flexible microfluidic strain sensor was fabricated by filling poly(3,4-ethylenedioxythiophene):polystyrenesulfonate–MXene–gold (PEDOT:PSS–MXene–Au) nanocomposites into microchannels in an elastic matrix. Owing to the unique properties of the nanofiller and Ecoflex elastomer microchannel, the microfluidic strain sensor detected a strain of 0%–500% with low hysteresis (2.4%), high sensitivity (guage factor = 25.4), short response times (∼86 ms), and good durability. Moreover, the flexible microfluidic sensor was used to detect various physiological signals and human activities, control a mechanical hand, and capture hand motions in real time. As demonstrated by its good performance, the proposed flexible microfluidic sensor holds great potential in applications such as wearable electronics, physiological signal monitoring and human–machine interactions.
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Small
·
2025
·
IF 12.1
Ruixue Li,Peng Song,Zhenyuan Ji,Hu Zhou,Xiaoping Shen,Lirong Kong,Aihua Yuan
MXene film-derived flexible supercapacitors have shown great application foreground for wearable electronics, but the capacitive characteristics, especially when faced with mechanical deformations, are not satisfactory. Herein, a new kind of flexible electrode, MX/D-MoO 3 , is developed by using Ti 3 C 2 T x MXene film (MX) and defect-rich MoO 3 (D-MoO 3 ) as the “main body” and “spacer-contributor”, respectively. Results indicate that, with D-MoO 3 intercalation, notably enlarged layer spacing of Ti 3 C 2 T x nanosheets and boosted electrochemical active sites are fulfilled, which have facilitated wondrous property increases of 342% and 239% when compared to raw MX and MX/MoO 3 , respectively. Particularly, MX/D-MoO 3 -60 has a high specific capacitance of 2734.3 mF cm −2 at 1 mA cm −2 , which surpasses most of the counterparts reported thus far. The MX/D-MoO 3 -60-based all-solid-state supercapacitor presents the largest energy density of 96.3 µWh cm −2 at 205.9 µW cm −2 and an outstanding power density of 1871.4 µW cm −2 at 18.6 µWh cm −2 . Meanwhile, impressive stability with capacitance retention of 91.8% after 5 000 cycles and great mechanical flexibility with capacitance retention of 90.3% under bending angles from 0 to 180° are also exhibited. The superior properties and facile preparation endow MX/D-MoO 3 -60 with promising applications in wearable energy storage.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
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IF 5.3
Xu Yuying,Chen Lijuan,Guo Xiaohui,Zhang Jian,Guo Xiaobing,He Ziqian,Zhang Jiani,Han Dongxue
A label-free photoelectrochemical (PEC) biosensing strategy was constructed based on a Cu 2 MoS 4 @Ti 3 C 2 T x MXene heterojunction for the sensitive detection of tetracycline (TC) in milk. The Cu 2 MoS 4 @Ti 3 C 2 T x MXene heterojunction substantially facilitates the separation of photogenerated electron–hole pairs, a key element in enhancing the photocurrent response. Cu 2 MoS 4 , renowned for its visible-light absorption and photocatalytic properties, is combined synergistically with Ti 3 C 2 T x MXene, contributing a large surface area and outstanding electrical conductivity. The heterojunction not only elevates photocatalytic efficiency but also provides abundant π–π stacking sites on the surface of Ti 3 C 2 T x MXene. These sites enable the direct immobilization of the TC aptamer without chemical modification, thereby minimizing marker interference and improving the detection accuracy. Furthermore, the heterojunction structure broadens the light-absorption spectrum and enhances charge-transfer efficiency, resulting in a higher photocurrent response. The proposed PEC aptasensor demonstrates a favorable linear response to TC within the concentration range 5 to 300 nM, with a detection limit of 1.24 nM. These results are comparable to those achieved by high-performance liquid chromatography. This study is expected to pioneer a novel approach for the design of a label-free PEC aptasensor applicable to the bioanalysis of food samples. Graphical abstract
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
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IF 5.6
Weixin Wu,Wenyao Feng,Yuanyua Yu,Lu Li,Minsheng Lu,Guangfu Qian,Changzhou Chen,Douyong Min
Flexible sensors based on double-network (DN) hydrogels have become a research hotspot for wearable sensors. However, developing hydrogel-based strain sensors with high tensile properties, sensitivity, and wide detection range remains a great challenge. Herein, a novel highly stretchable, sensitive, and durable strain sensor based on MXene-enhanced polyacrylamide/carboxymethyl cellulose double-network hydrogel (PCM) was prepared, where PAM served as the rigid backbone, while CMC mainly acted as a flexible sub-network structure. MXene was utilized to enhance the mechanical properties of the hydrogel via tight hydrogen bonds between its surface functional groups and the chains of PAM and CMC, while also being applied to build a conductive path in the system. As a result, the prepared hydrogel-based strain sensor featured a wide detection range (0–500%), quick response time (120 ms for loading time and 190 ms for unloading time), high sensitivity (a gauge factor of 16.33), great toughness, and excellent stability. These advantages enable the prepared sensor to be used in dynamically monitoring human movements, such as joint bending, and performing handwriting recognition. This work provides potential development, research and application of double-network flexible hydrogel in wearable materials.
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Advanced Science
·
2024
·Vol. 11
·期 36
·2404889
·
IF 14.3
Ruige Su,Misheng Liang,Yongjiu Yuan,Chaojun Huang,Wenqiang Xing,Xiaomeng Bian,Yiling Lian,Bo Wang,Zheng You,Rui You
Flexible sensors based on laser-induced graphene (LIG) are widely used in wearable personal devices, with the morphology and lattice arrangement of LIG the key factors affecting their performance in various applications. In this study, femtosecond-laser-induced MXene-composited graphene ( LIMG ) is used to improve the electrical conductivity of graphene by incorporating MXene, a 2D material with a high concentration of free electrons, into the LIG structure. By combining pump-probe detection, laser-induced breakdown spectroscopy (LIBS), and density functional theory (DFT) calculations, the morphogenesis and lattice structuring principles of LIMG is explored, with the results indicating that MXene materials are successfully embedded in the graphene lattice, altering both their morphology and electrical properties. The structural sparsity and electrical conductivity of LIMG composites (up to 3187 S m −1 ) are significantly enhanced compared to those of LIG. Based on these findings, LIMG has been used in wearable electronics. LIMG electrodes are used to detect uric acid, with a minimum detection limit of 2.48 µM. Additionally, LIMG -based pressure and bending sensors have been successfully used to monitor human limb movement and pulse. The direct in situ femtosecond laser patterning synthesis of LIMG has significant implications for developing flexible wearable electronic sensors.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Shaokai Hu,Ping Han,Chao Meng,Ying Yu,Shaolong Han,Haoyu Wang,Gang Wei,Zheng Gu
With the huge demand and rapid development of portable, intelligent, and microscale equipment, more stringent requirements are put forward for the thickness, performance, and cost of the electromagnetic interference (EMI) shielding materials. In this work, flexible and ultrathin MXene/nanofiber (MX/NF) composite films with excellent EMI shielding performance are designed and fabricated by self-stacked assembly through vacuum-assisted filtration. 2D MXene nanosheets are utilized as conductive materials to construct a conductive path, and cellulose nanofibers (CENF) and carbon nanofibers (CANF) are applied to improve the flexibility and supportability of the designed composite films. When the mass ratio of MXene to CANF-CENF is 4:1 and the thickness of the composite film is 11 μm, the shielding effectiveness (SE) of the EMI film reaches 43.1 dB. In addition, the ranking efficiency product (REP) sustainability analysis is performed for the MX/NF-0.8 and three other EMI films, and it is found that the MX/NF-0.8 composite film possesses the largest REP value of 0.787. Besides, it exhibits the advantages in terms of degradability and shielding performance. The presented flexible, ultrathin EMI shielding films with layer-stacked structure reveal great application potential in the field of EMI shielding and could be appliable for wearable intelligent devices.
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