Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2688-2694
·
IF 6.4
Shengping Dai,Hongwei Hu,Yixin Zhang,Jiang Xu,Yan Zhong,Guanggui Cheng,Jianning Ding
The hydrophobic encapsulation method is one of the common methods to ensure the regular operation of electronics under water. However, the hydrogel underwater sensors prepared by hydrophobic encapsulation still suffer from weak interfacial bonding. Here, we developed a high toughness and low hysteresis, dual-physically cross-linked structure hydrogel that was hydrophobically regulated by an MXene. The introduction of an MXene into the hydrogel can not only enhance the conductivity as a conductive filler, but also improve the mechanical properties as a physical cross-linking point. At the same time, the hydrophobic fluorine groups of the MXene can regulate the hydrophobic properties and enhance the bonding strength with the hydrophobic layer. In this way, a hydrophobic encapsulation structure hydrogel–elastomer hybrid was constructed, which showed a maximum bonding strength of 34.19 ± 1 N m−1, and excellent anti-drying (7d, ≤5.5%), and anti-swelling (7d, ≤0.07) properties. Furthermore, the core–shell structure hybrid fiber sensor exhibited excellent conductivity, sensitivity, and long-term stability performance in harsh environments, such as underwater, acid (pH = 1), alkali (pH = 14), salt solution (1 M NaCl), and alcohol solution. It provides a reliable opportunity for underwater smart wearable sensors using hydrogels with high flexibility.
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ACS Nano
·
2023
·
IF 17.1
Yongfa Cheng,Yimei Xie,Zunyu Liu,Shuwen Yan,Yanan Ma,Yang Yue,Jianbo Wang,Yihua Gao,Luying Li
Among the increasingly popular miniature and flexible smart electronics, two-dimensional materials show great potential in the development of flexible electronics owing to their layered structures and outstanding electrical properties. MXenes have attracted much attention in flexible electronics owing to their excellent hydrophilicity and metallic conductivity. However, their limited interlayer spacing and tendency for self-stacking lead to limited changes in electron channels under external pressure, making it difficult to exploit their excellent surface metal conductivity. We propose a strategy for rapid gas foaming to construct interlayer tunable MXene aerogels. MXene aerogels with rich interlayer network structures generate maximized electron channels under pressure, facilitating the effective utilization of the surface metal properties of MXene; this forms a self-healable flexible pressure sensor with excellent sensing properties such as high sensitivity (1,799.5 kPa–1), fast response time (11 ms), and good cycling stability (>25,000 cycles). This pressure sensor has applications in human body detection, human–computer interaction, self-healing, remote monitoring, and pressure distribution identification. The maximized electron channel design provides a simple, efficient, and scalable method to effectively exploit the excellent surface metal conduction of 2D materials.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Nan Li,Tian-Jiao Lou,Wenyi Wang,Min Li,Li-Chao Jing,Zhi-Xian Yang,Ru-Yu Chang,Jianxin Li,Hong-Zhang Geng
The appearance of the composite membrane provides a new research direction for reducing membrane fouling . In this study, polyaniline (PANI) and Ti 3 C 2 T x (MXene) were combined by the electrostatic assembly method where PANI was used to adjust the distance between MXene layers and construct the conductive network. The conducting mixed ultrafiltration membranes were prepared by the non-solvent induced phase separation method, in which MXene and PANI were mixed into a polyethersulfone (PES) matrix. The permeation flux of pure water of the MXene-PANI/PES membrane was increased by 200.9%, the retention rate of bovine serum albumin (BSA) was kept above 99%, and the retention rate of Congo Red and Methyl blue dyes was 99.1% and 98.4%, respectively, this goes well beyond the PES membrane. In addition, through a series of conductivity tests, it has been proved that the conductive properties of composite membranes were greatly improved, and the conductivity of the MXene-PANI/PES composite membrane can reach 0.5 S m −1 . After applying a negative voltage to the membrane, the negative charge around the surface of the membrane repels the negatively charged contaminant under the action of an electrostatic repulsion force, thereby the enrichment of pollutants on the membrane surface can be effectively reduced, and the FRR reached 93.7%. On the basis of ensuring membrane conductivity, we improved the permeability, selective separation, and anti-fouling ability of the membrane. This research shows great potential for the efficient development of an anti-fouling conductive separation membrane based on MXene.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Liyi Zhang,Yongcong Liu,Guangyong Zeng,Zhaomei Yang,Qingquan Lin,Yanyong Wang,Xiaoguang Wang,Shengyan Pu
MXene-based two-dimensional (2D) material membranes have attracted an increasing number of attentions in the field of separation and purification. However, the easily oil-pollution of MXene membrane still limit its further application for oil/water separation. In this work, Na-Bentonite was embedded into MXene nanosheets and then a series of Na-Bentonite@MXene (NBM) composite membranes were prepared by one-step hydrothermal pretreatment and vacuum self-assembly on polyvinylidene fluoride membrane surface. The modified composite membranes exhibited excellent separation performances with a rejection ratio above 96 % and a flux recovery rate (FRR) higher than 86 % after 8 cycling tests for oil/water emulsion. In addition, the sandwich structure consisting of MXene nanosheets and Na-Bentonite could not only play a positive role in the stability of composite membrane, but also formed a special micro-nano structure on membrane surface, resulting in a switchable wettability of composite membrane. When the membrane surface was pretreated with water or oil, it presented hydrophilic/hydrophobic or hydrophobic/oleophilic surfaces, respectively, which realized the effective separation for different components in oil/water emulsion. This work provides a new method for the design and construction of MXene-based 2D membrane with continuous anti-fouling capacity, which shows a great application potential in the treatment of oily wastewater.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Dekui Song,Mei-Jiao Zeng,Peng Min,Xue-Qin Jia,Fu-Lin Gao,Zhong-Zhen Yu,Xiaofeng Li
Although piezoresistive sensors have wide applications in human motion detection and wearable electronics, it is still a challenge to produce multifunctional and integrated sensors with wide working ranges and linear sensing responses. Herein, electrically conductive, highly compressible, and structurally anisotropic MXene-wood (MW) sponges are fabricated by converting balsa wood blocks to compressible wood sponges with extremely low density and highly anisotropic porous structure, followed by decorating with conductive MXene sheets. The MW sponge is utilized to assemble a piezoresistive sensor with a large working range of 0–25 kPa, wide linear sensing ranges of 5%–50% and 0–180°, and excellent long-term reliability under a bending angle of 30° for 5000 cycles. Additionally, the sensor is suitable for monitoring practical human physiological signals including pulse beating, and finger and wrist bending. An all-MW sponge-based multifunctional and integrated sensing system is constructed by integrating the MW sponge piezoresistive sensor, the MW sponge-based solid-state supercapacitor, and the MW sponge electrophysiological electrodes. The sensing system can concurrently detect surface electromyogram and tactile pressures, and hence realize real-time closed-loop controls. The multifunctional and integrated MW sponge sensing system would have great potentials in real-time pressure recognition and human-machine interfaces.
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Scientific Reports
·
2023
·Vol. 13
·期 1
·1-10
·
IF 4.6
Zhao Xiaojiong,Tian Min,Wei Ruichao,Jiang Saihua
To improve flame retardancy of wood, a novel high-water-retention and self-healing polyvinyl alcohol/phytic acid/MXene hydrogel coating was developed through facile one-pot heating and freeze–thaw cycle methods, and then painted on wood surface. The coating exhibit excellent self-healing property and significantly enhanced water-retention property (water content ≥ 90 wt%), due to the increased hydrogen bonds within the coating system with the presence of MXene nanosheets. Compared to pristine wood, the flame retardancy of coated wood is greatly improved, such as passed V0 rating in UL-94 test, increasing time to ignition (TTI, from 32 to 69 s), and decreased heat release rate and total heat release by 41.6% and 36.14%. The cooling effect and large thermal capacity of high-water-retention hydrogel, and physical barrier effects for flammable gas products, heat and oxygen by MXene nanosheets and the compact char layer formed during combustion play key roles in the flame retardancy enhancements of the wood. High thermal stability of MXene nanosheets is another beneficial factor. The detailed flame-retardant and self-healing mechanisms were proposed.
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高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 9
·2201767
·
IF 6.8
Yan Bai,Yuyuan Lu,Shuaihang Bi,Weikang Wang,Feifei Lin,Fu Zhu,Pin Yang,Ning Ding,Shujuan Liu,Weiwei Zhao,Ning Liu,Qiang Zhao
Wearable human-machine interaction (HMI) is an advanced technology that realizes operations, collaborations, and interactions between human and machines in a co-located or coordinated way. As the core component of wearable HMI electronics, the flexible sensor is desirable to be intelligent, accurate, collaborative, and multifunctional for the feedback control. Here, the multifunctional MXene/polyacrylic acid (PAA) hydrogel is prepared by radical polymerization. As a flexible strain sensor, it exhibits high sensitivity (gauge factor ≈4.94), wide detection range (0–1081%) and stable signal output for 500 cycles. It can also monitor human movement and operate manipulator in real time, exhibiting great potential in wearable artificial intelligence and HMI. Furthermore, the MXene/PAA hydrogel shows photothermal conversion performance with controllable surface temperature regulation ability (RT ≈67 °C) under near-infrared radiation. This work sheds a new light to develop the collaborative and multifunction wearable HMI electronics through integrating the flexible sensor with personal thermal management system.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ning An,Zhen Guo,Chao Guo,Maoqing Wei,Daming Sun,Yuanyuan He,Wenli Li,Lei Zhou,Zhongai Hu,Xiuyan Dong
Covalent organic frameworks (COFs) are an emerging class of crystalline porous polymer due to their well-defined channels, highly accessible surface areas and tunable active sites, showing great application potential in the field of energy storage. However, their low inherent conductivity and poor accessibility (difficult to dissolve or melt) have largely limited their electrochemical performances and practical applications. Here, a cation-driven self-assembly process was used to prepare flexible carbonyl containing COF/MXene composite film electrode (CMFs). The uniform intercalation of porous COFs in layered MXene was realized by electrostatic attraction between negatively charged 2D MXene nanosheets and the protonated DAAQ-COFs. Porous COFs tightly contact with MXene and effectively alleviate the self-restacking of MXene nanosheets. In addition, under the synergistic effect, the ordered one-dimensional pore structure of COFs and excellent intrinsic conductivity of MXene can greatly enhances the electron transfer and ion migration rates and further improves the reaction kinetics for flexible composite electrodes. In the three-electrode system, the integrated CMFs film electrode delivers excellent electrochemical performances (the capacitance of 390 F g −1 at 0.5 A/g), excellent kinetic energy storage characteristics (capacitive contribution can be up to 96.7 % at 50 mV/s) and superb mechanical strength (repeated bending 100 times). By assembling into all-solid-state flexible supercapacitor, CMFs//CCMP asymmetric supercapacitors (ASC) achieves the maximum energy density of 27.5 Wh kg −1 (at a power density of 350 W kg −1 ), maximum power density of 7000 W kg −1 (at an energy density of 19.7 Wh kg −1 ) and the ultrahigh capacitance retention of 88.9 % after 20,000 charging-discharging long cycles, suggesting great potentials for the applications in future flexible and wearable devices.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mengshu Li,Ziquan Zeng,Weicai Liu,Hui Zong,Bo Li,Shijing Gong,Ke Yu,Ziqiang Zhu
In space, electrolysis of water is one of the main methods to generate oxygen (for life support), and its harsh environment places higher demands on the oxygen evolution reaction (OER). Cobalt-based carbonate hydroxides (CCH) have emerged as new candidates for OER catalysts in recent years. However, disadvantages such as poor catalytic activity and easy agglomeration of pristine CCH hinder its application in catalysis. Herein, we synthesized ZnCoCH@Ti 3 C 2 T x heterostructure with a unique structure of grass-like Zn-doped bimetallic carbonate hydroxides grown in situ on MXene by a solvothermal method. The ZnCoCH@Ti 3 C 2 T x electrocatalyst in 1 M KOH shows a low overpotential (280 mV) at 10 mA cm −2 , a small Tafel slope (46.2 mV dec -1 ) and a Faraday efficiency of nearly 100 %. The experimental and DFT calculations show that MXene plays a dual enhancing role as a conductive carrier and a reducing agent in improving the OER performance. As a conductive carrier, MXene alleviates the agglomeration of ZnCoCH and enhances the conductivity and charge transfer ability of the heterostructure. As a reducing agent, MXene provides more redox sites by reducing ZnCoCH and promotes the adsorption of intermediate species on the catalyst. Zn is not only an economical and eco-friendly metal but also may have anti-toxicity. This study provides a reasonable idea for the design of efficient, economical, green and poison-resistant OER catalysts for electrolytic water.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Na Kong,Ke Lv,Wenting Chen,Jie Guan,Pengfei Zhao,Jinlong Tao,Jizhen Zhang
MXenes, two-dimensional (2D) transition-metal carbides and nitrides with high electrical conductivity, show outstanding potential for energy storage applications. However, the aggregation and restacking of 2D MXene nanosheets seriously decrease the performance of MXene-based electrodes. Instead of using high-cost artificial templates, herein, we select natural rubber (NR) latex-containing uniform sub-macroparticles as sacrificial templates and successfully construct three-dimensional interconnected porous MXene foam. This porous structure effectively prevents the restacking of MXene nanosheets and accelerates the transfer of electrolyte ions during charging and discharging, which significantly enhances capacitance and rate performance. By adjusting the loading of latex, we find that MXene foam (MXF)-70% provides both improved specific capacitance of 480 F g–1 at 2 mV s–1 and superior rate performance (42.1% residual at 1 V s–1) with excellent cycling stability of 97.1% capacitance retention after 10000 cycles at 50 mV s–1. Additionally, the low cost of natural rubber latex provides an alternate route to produce foam electrodes on a large scale for portable and integrated supercapacitors.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Yaxin Zhang,Zhuang Chen,Yimei Zhang,Wenwen Gu,Wendy Huang,Jiangshan Xi,Ting Cao,Yingjie Yu,Mingwang Yang,Luoyilang Ke
In this system, a highly-exposed TiO 2 photoanode was prepared as an effectively photoelectrocatalyst peroxymonosulfate (PMS) activator. Especially, we realize the highly-exposed TiO 2 grown on negatively charged MXene nanosheet which could provide dual active sites for stimulating PMS. The catalysts were characterized by XRD, XPS, SEM, UV–vis, Raman, TEM, and BET. The specific surface area for highly-exposed TiO 2 (S-400) is 10 times than Bulk catalyst (B-400), which is displayed in the BET result. The experimental results show that high exposure catalyst has excellent photoelectric activation performance. The degradation efficiency of the PEC + PMS system was 2.94 times higher than the EC + PMS and 2.76 times higher than the PC + PMS process. Compare with free PMS (1.36˚A), PMS adsorbed at the photoanode interface has a high bond angle (2.85˚A) easily to decompose into strong oxidizing SO 4 − . The electrochemical characterization results demonstrated that the highly-exposed TiO 2 had a higher separation rate of photogenerated carriers. From quenching experiments, the holes (h + ) contributed 80 % to BPA degradation in PEC + PMS system, the contribution order of other active radicals was O 2 − >SO 4 − > OH. It will help improving the control of the optimal free radical ratio. The probable mechanism and pathway of BPA degradation were suggested e − reacts with PMS and other substances to generate radicals. The research offers a new strategy for the effective activation about PMS to oxidation of the refractory organics. Besides, the results provide useful theoretical guidance for the development of new high-activity materials.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Krishnan Subramanyan,Sanming Chen,Na Li,Tingting Ma,Yongping Liu,Sundaram Chandrasekaran,Vanchiappan Aravindan
We report an MXene V 4 C 3 T x new low-voltage insertion anode and a comparison of the electrochemical performance with ester and ether-based electrolytes in half– and full–cell configuration with Na 3 V 2 (PO 4 ) 3 @C (NVPC). Though MXene has been explored for Na-ion batteries (SIB), M n +1 X n T x with n = 3 has been hardly explored. Moreover, the ether-based electrolyte has not been used with any MXenes for electrochemical energy storage , especially in the SIB perspective. The initial irreversibility in the carbonate-based half–cell (V 4 C 3 T x –C) is 128 mAh g −1 more than the tetraglyme–based half–cell (V 4 C 3 T x –T). After 100 cycles, V 4 C 3 T x –T maintains 84 mAh g −1 , while V 4 C 3 T x –C shows only 60 mAh g −1 , which shows the better retention ability in the ether-based system. As for the rate performance, though V 4 C 3 T x –T has a higher capacity in low currents, at higher currents, V 4 C 3 T x –C shows higher values. This showed that the carbonate-based system has diffusion and capacitive-based Na–ion storage, which enabled it to have a high–rate performance. An extensive in–situ impedance study revealed significant formation of the passivation layer in V 4 C 3 T x –C by irreversibly consuming Na–ions, which causes an increased initial Coulombic inefficiency, whereas no such significant SEI layer formation is evident for V 4 C 3 T x –T. Full–cells were assembled with NVPC cathode in tetraglyme and carbonate-based electrolytes. The full–cell with ether electrolyte exhibited enhanced capacity, capacity retention, and rate performance compared to ester-based electrolytes. The full-cell displayed an energy density of ∼66 and ∼74 Wh kg −1 for tetraglyme and ester-based electrolytes, respectively.
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