ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Qingqing Li,Xinrong Zhi,Yifan Xia,Shilei Han,Wenyu Guo,Mingyuan Li,Xin Wang
Conductive hydrogels as promising candidates of wearable electronics have attracted considerable interest in health monitoring, multifunctional electronic skins, and human–machine interfaces. However, to simultaneously achieve excellent electrical properties, superior stretchability, and a low detection threshold of conductive hydrogels remains an extreme challenge. Herein, an ultrastretchable high-conductivity MXene-based organohydrogel (M-OH) is developed for human health monitoring and machine-learning-assisted object recognition, which is fabricated based on a Ti3C2Tx MXene/lithium salt (LS)/poly(acrylamide) (PAM)/poly(vinyl alcohol) (PVA) hydrogel through a facile immersion strategy in a glycerol/water binary solvent. The fabricated M-OH demonstrates remarkable stretchability (2000%) and high conductivity (4.5 S/m) due to the strong interaction between MXene and the dual-network PVA/PAM hydrogel matrix and the incorporation between MXene and LS, respectively. Meanwhile, M-OH as a wearable sensor enables human health monitoring with high sensitivity and a low detection limit (12 Pa). Furthermore, based on pressure mapping image recognition technology, an 8 × 8 pixelated M-OH-based sensing array can accurately identify different objects with a high accuracy of 97.54% under the assistance of a deep learning neural network (DNN). This work demonstrates excellent comprehensive performances of the ultrastretchable high-conductive M-OH in health monitoring and object recognition, which would further explore extensive potential application prospects in personal healthcare, human–machine interfaces, and artificial intelligence.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 7
·3262
·
IF 4.6
Shuya Xue,Min Shi,Jinye Wang,Jiapeng Li,Guanwei Peng,Jingkun Xu,Yansha Gao,Xuemin Duan,Limin Lu
In this work, TiO2-MXene/poly (3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) composite was utilized as an electrode material for the sensitive electrochemical detection of baicalein. The in-situ growth of TiO2nanoparticles on the surface of MXene nanosheets can effectively prevent their aggregation, thus presenting a significantly large specific surface area and abundant active sites. However, the partial oxidation of MXene after calcination could reduce its conductivity. To address this issue, herein, PEDOT:PSS films were introduced to disperse the TiO2-MXene materials. The uniform and dense films of PEDOT:PSS not only improved the conductivity and dispersion of TiO2-MXene but also enhanced its stability and electrocatalytic activity. With the advantages of a composite material, TiO2-MXene/PEDOT:PSS as an electrode material demonstrated excellent electrochemical sensing ability for baicalein determination, with a wide linear response ranging from 0.007 to 10.0 μM and a lower limit of detection of 2.33 nM. Furthermore, the prepared sensor displayed good repeatability, reproducibility, stability and selectivity, and presented satisfactory results for the determination of baicalein in human urine sample analysis.Keywords:TiO2-MXene;oxygen vacancy;PEDOT:PSS;baicalein;electrochemical sensor
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SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Haifeng Bian,Yanyan Du,Yilun Ren,Hao Wu,Yujie Ma,Beibei Yang,Shaochun Tang,Duan Bin,Hongbin Lu,Xiangkang Meng
Polypyrrole (PPY) coating is promising for the anticorrosion of stainless steel (SS) bipolar plates (BPs) in virtue of its good conductivity and corrosion resistance . However, the poor adhesion and pore defects of pure PPY coating limit its application. In this work, a PPY/Ti 3 C 2 T x MXene composite coating was synthesized on 304SS BPs by one-step electrodeposition , which is a facile method to realize the polymerization of PPY and the doping of MXene at the same time. The PPY/MXene coating exhibits better long-term immersion stability in simulated proton exchange membrane fuel cell (PEMFC) environment than pure PPY. The enhanced corrosion resistance is mainly benefited from the enhanced barrier effect, anodic protection effect and adhesion by the introduction of MXene. Meanwhile, the introduction of MXene significantly improves the conductivity of the coating and decreases the interfacial contact resistance at 1.4 MPa from 108.16 mΩ·cm 2 to 55.24 mΩ·cm 2 .
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jie Yang,Jianli Cheng,Guicai Qi,Bin Wang
The ability of a flexible strain sensor to directly adapt the complicated human biological motion or combined gestures and remotely control the artificial intelligence robotics could benefit the wearable electronics such as intelligent robotics and patient healthcare. However, it is a challenge for the flexible strain sensor to simultaneously achieve high sensing performances and stretchability and long sustainability under various deformation stress or damage. Herein, a dual-cross-linked poly(acrylic acid–stearyl methacrylate)/MXene [P(AA–SMA)M] hydrogel with enhanced mechanical stretchability and self-healability is fabricated by importing reversible coordination and hydrophobic interaction into polymer networks. As a result, the hydrogel film not only exhibits high tensile strength (525 kPa) and stretchability (∼2600%) but also achieves repetitive healable property with 843% elongation even after the 20th broken/self-healing cycle. More importantly, the resultant strain sensor delivers a low detection limit, wide sensing range, fast response time, and repeatability of 1000 cycles even after repeated self-healing. So, the sensor can monitor subtle human motions and recognize different handwriting and gestures, which reveals potential applications toward health-care devices, flexible electronics, and human–machine interfacing.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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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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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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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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JOURNAL OF MEMBRANE SCIENCE
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2022
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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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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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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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Juanjuan Yin,Kuo Wei,Yuwei Bai,Ying Liu,Qingrui Zhang,Jing Wang,Zhihui Qin,Tifeng Jiao
Two-dimensional (2D) MXenes-based nanostructures have recently emerged as effective electrocatalysts because of their excellent electrical conductivity and superior hydrophilicity. Nevertheless, the low electrocatalytic activity and the poor stability have hampered their applications in practical hydrogen production. Herein, a novel method to modulate the electronic structure and improve the catalytic activity of MXene by integrating amorphous CoSnO 3 onto wrinkled Ti 3 C 2 T x MXene nanosheets is reported, producing a promising electrocatalyst (MXene@CoSnO 3 ) toward alkaline hydrogen evolution reaction (HER). It is found that CoSnO 3 nanocubes are well grown on the surface of Ti 3 C 2 T x MXene, stabilizing MXene nanosheets against spontaneous oxidation. More importantly, the strong interfacial electronic coupling between the two components greatly prompts the redistribution of electrons at the MXene and CoSnO 3 interfaces and alters the electronic structure around Co, which enables the activation of high-potential Sn to have an optimal *H adsorption (ΔG*H), promoting the H* conversion for HER. The fabricated MXene@CoSnO 3 exhibits high alkaline HER performances with an ultralow overpotential of 45 mV at 10 mA cm −2 , a small Tafel slope of 51 mV dec -1 and the long-term stability in 1 M KOH, which even compares with commercial Pt/C catalyst.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Bing Liu,Xia Zhang,Jialong Chu,Fei Li,Caixia Jin,Jing Fan
Co-catalysts can achieve efficient separation of photogenerated carriers and are considered as a promising strategy for solar photocatalytic removal of pollutants. Herein, we reported the synthesis of nanocomposite of BiOIO 3 /Ti 3 C 2 MXene combining two dimensional 2D BiOIO 3 with 2D Ti 3 C 2 MXene co-catalyst. The few-layered 2D Ti 3 C 2 MXene provided more adsorption and reaction sites. Furthermore, the synergism of intimate interfacial contact between the two 2D nanosheets and robust metallic electrical conductivity of Ti 3 C 2 MXene significantly accelerated the separation and migration of photogenerated charge carriers. A variety of organic pollutants were proved to be effectively degraded by 2D/2D BiOIO 3 /Ti 3 C 2 MXene composites. The degradation efficiencies followed the order tetracycline hydrochloride (93.4 %) > diclofenac sodium (87.6 %) > levofloxacin hydrochloride (77.4 %) > 4-nitrophenol (43.3%). Besides, the satisfactory recycling and stability of BiOIO 3 /Ti 3 C 2 MXene for the degradation of organic pollutants in water under solar irradiation predicted its good prospect for practical applications.
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