CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Yang Wang,Liweng Ma,Feng Xu,Rongkai Ren,Jianzhi Wang,Chen Hou
The novel photocatalytic advanced oxidation catalyst, ZIF-67@MXene-TA-CNF (ZIF-67@MTC) aerogels , was prepared via introducing tannic acid-coated cellulose nanofibril (TA-CNF), two-dimensional layered MXene, and ZIF-67 into a composite aerogel network. Specially, TA assisted the crosslinking of CNF through hydrogen bonds to construct the flexible aerogel skeleton, accompanied by assembly of MXene and ZIF-67. MXene not only provided sufficient attachment sites for the anchoring of ZIF-67, but also can be used as a repository for electron transfer to facilitate the separation of photogenerated electrons and holes. In the peroxymonosulfate (PMS)/aerogels/visible light system, the SO 4 - , OH and 1 O 2 were generated, and 1 O 2 was the main reactive species. As a result, 99.9 % of Tetrabromobisphenol A (TBBPA) can be degraded and the total organic carbon (TOC) removal efficiency reached 81.8 % within 40 min in this system. The results might provide a new concept for the design of biomass aerogels for applications in organic pollutant removal.
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Nano Energy
·
2023
·
IF 17.6
Mingyuan Chao,Pengju Di,Yue Yuan,Yajin Xu,Liqun Zhang,Pengbo Wan
Multifunctional flexible wearable epidermic sensors have gained enormous attention for their promising potential applications in personal health management, electronic skins and intelligent human-machine interaction. However, it remains a critical challenge to realize a flexible breathable sensing device with reliable sensing performances for comfortably wearable human motion detection and ultrasensitive human-machine interfacing with the integrated functional capability of disease diagnosis and subsequent photothermal therapy simultaneously. Herein, a flexible breathable epidermic sensor is fabricated by delicately assembling conductive MXene nanosheets and silver nanowires (AgNWs) onto electrospun elastomeric substrates for ultrasensitive sensing and on-demand photothermal therapy. The as-prepared flexible breathable electronic sensor presents a broad sensing range (up to ∼120 %), ultrahigh sensitivity (gauge factor (GF) up to 4720), extremely low detection limit, remarkable reliability, and robust biocompatibility for serving as the electronic skin to monitor human physiological signals and wearable human-machine interaction. Moreover, it exhibits brilliant photothermal properties for enhanced antibacterial effect and timely photothermal therapy after healthcare monitoring and disease diagnosis. This work provides a facile way of developing flexible breathable multifunctional electronic sensors featured with excellent sensing ability, brilliant breathability and reliable photothermal properties for long-term healthcare monitoring, ultrasensitive wearable human-machine interfacing, smart disease diagnosis and treatment.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jinghua Liu,Xuejie Meng,Fan Dong,Suyu Ren,Bo Wang,Feng Tan
Flexible sensors require good tensile properties, flexibility, and enough sensitivity for monitoring and transmitting subtle strain changes in motion. Here, the MXene-sodium alginate-acrylamide (MSA) composite hydrogel was synthesized by polymerization of acrylamide (AM), Ti3C2Tx MXene nanosheets, and sodium alginate (SA). Scanning electron microscopy, energy dispersive spectroscopy, and elemental mapping demonstrated a uniform dispersion of Ti3C2Tx MXene nanosheets in the composite hydrogel regime. The strong hydrogen bonding interactions between Ti3C2Tx MXene nanosheets and SA–AM polymers were verified by Fourier transform infrared spectroscopy and differential scanning calorimetry analysis. The prepared M20S2.5A hydrogel had 4350% limited tensile strain and fractured energies up to 359.51 J m–2 and significant hysteresis in cyclic loading–unloading experiments, indicating its excellent energy dissipation performance. The conductivity of the M20S2.5A hydrogel had a good linear response (1300–3500%) with the stretch distance and a fast response time of 0.27 s. At the same time, MSA hydrogels have high sensitivity (GF = 2.31). These advantages allowed it to real-time monitor the random motion of the human body such as throat swallowing, finger bending, and knee flexion and extension. The present study showed great potentials of the MSA hydrogel in flexible wearable devices.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Fuqiang Guo,Cheng Feng,Zheng Zhang,Lili Zhang,Chang Xu,Congting Zhang,Shuang Lin,Huanxing Wu,Baohua Zhang,Aersi Tabusi,Yineng Huang
In this paper, the Ti 3 C 2 T x /CuO nanocomposites were successfully prepared by an environment-friendly and simple hydrothermal method . The synthetics are evaluated using a series of characterization techniques, such as XRD , SEM, TEM , XPS , FTIR, UV–vis, and BET techniques. The results show that Ti 3 C 2 T x /CuO nanocomposites are mesoporous and have a higher specific surface area than Ti 3 C 2 T x , confirming the presence of more gas adsorption/diffusion regions. Furthermore, the Ti 3 C 2 T x with the introduction of CuO has rich oxygen vacancies and adsorbed oxygen. In particular, the response of Ti 3 C 2 T x /CuO sensor (56.99%) is 5 times higher than that of Ti 3 C 2 T x (11.17%) sensor to 50 ppm NO 2 at room temperature (RT). Especially, the Ti 3 C 2 T x /CuO sensor exhibits ultra-fast response/recovery time (16.6/31.3 s to 20 ppm NO 2 ), great reversibility , outstanding selectivity to NO 2 , and desirable long-term stability (over 40 days). The enhanced gas sensing performance may be attributed to the formation of hybrid heterojunctions between CuO and Ti 3 C 2 T x that provide carrier migration channels to hasten the redox reaction . At the same time, Ti 3 C 2 T x /CuO possesses more oxygen vacancies and adsorbed oxygen than Ti 3 C 2 T x , which will reduce the required energy for gas adsorption to further enhance the gas sensing performance. Hopefully, the above improved gas sensing performance indicators modified with CuO are expected to become the advantage of constructing Ti 3 C 2 T x -based sensor, which will be put into commercial NO 2 detection in the future.
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ADVANCED ENGINEERING MATERIALS
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2023
·Vol. 25
·期 8
·2201425
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IF 3.6
Lingling Liu,Hongdie Yin,Wei Guo,Bi Jia,Hanmei Jiang
Ti 3 C 2 T x MXene is one of the most promising electrode materials for supercapacitors, but it often suffers in poor experiment gravimetric capacitance, which limits practical applications in industry needs. Herein, etched Ti 3 C 2 T x MXene with high gravimetric capacitance is prepared by chemical etching of MXene with concentrated alkaline solution. The intercalation of K + and the scissor role of OH − can simultaneously enlarge the interlayer spacing and cut the size of sheets, which lead to the high active-site concentration and cation diffusion. As a result, the etched Ti 3 C 2 T x MXene displays high gravimetric capacitance of 368.1 F g −1 at 2 A g −1 and outstanding cycling stability without capacitance loss over 5000 cycles at 6 A g −1 ,and the surface capacitance contribution in etched Ti 3 C 2 T x MXene occurs to a greater extent compared with the pristine MXene. Moreover, the effect of chemical etching on the supercapacitor performance and energy-storage mechanism indicates that the active-size concentration and cation diffusion could be maximized when the chemical etching conditions are appropriate, leading to the highest performance of etched Ti 3 C 2 T x MXene. Herein, it is demonstrated that the chemical etching approach is applicable to design MXenes with high gravimetric capacitance to maximize their potential applications in energy-storage applications and other fields.
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ENVIRONMENTAL POLLUTION
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2022
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IF 9.988
Di Zhang,Lijie Liu,Bing Zhao,Xiangxue Wang,Hongwei Pang,Shujun Yu
Uranium mainly exists in the form of uranyl carbonate in seawater. [UO 2 (CO 3 ) 3 ] 4- has strong stability, which increases the difficulty of uranium extraction from seawater. Meanwhile, the complex marine environment, a large number of coexisting competing ions and biological pollution are all non-negligible disturbing factors. Herein, we introduced amidoxime (AO) groups into the surface of Ti 3 C 2 and grafted polyamides (PA) by a simple one-step hydrothermal method to produce an efficient seawater uranium extraction adsorbent Ti 3 C 2 -AO-PA. Owing to the amidoxime groups, the material was highly selective for uranium. And the large number of amino groups in the polyamides gave it ideal resistance to biofouling. The possibility of Ti 3 C 2 -AO-PA as an adsorbent for uranium extraction from seawater was confirmed by various characterization techniques, numerous adsorption batch experiments, simulated seawater experiments and antibacterial performance tests. It was demonstrated that the uptake of [UO 2 (CO 3 ) 3 ] 4- by Ti 3 C 2 -AO-PA showed fast reaction kinetics (about 120 min), brilliant absorption capacity (81.1 mg·g −1 at pH 8.3), significant high selectivity (32.8 mg-U/g-Ads) and outstanding anti-biological contamination performance (92.9% antibacterial rate). XPS and DFT further indicated that the high extraction ability of Ti 3 C 2 -AO-PA for uranium was mainly attributed to the strong complexation of AO and –NH 2 with [UO 2 (CO 3 ) 3 ] 4- . These conclusions showed that Ti 3 C 2 -AO-PA not only had an ideal application prospect for uranium extraction from seawater, but also provided an available strategy for rapid and selective uranium adsorption from real seawater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Xiaodong Wang,Shuang Wang,Chenglong Li,Yinghe Cui,Zhipeng Yong,Dan Liang,Yue Chi,Zhe Wang
Recently, hydrogel materials have been widely used in flexible energy storage devices due to their excellent electrical conductivity and nearly solid mechanical properties. But, due to the plenty of water in the traditional hydrogel electrolyte, the disadvantages of high temperature water loss and low temperature icing are inevitable. In order to solve this problem, we have fabricated an organic gel electrolyte (OGE) and assembled it with activated carbon electrode into flexible organic gel electrolyte supercapacitors (OGESCs). In terms of gel design, the MXene crosslinked polyacrylic acid-N-hydroxyethyl acrylamide (PAA-NHEA-MXene) hydrogel network is replaced by a mixture of lithium chloride and ethylene glycol solvent, showing excellent electrical conductivity (3 and 19.8 mS/cm at −20 and 25 °C, respectively) and good mechanical properties . Due to the replacement of the solvent, the operating temperature of OGESCs is extended (-20-80 °C) and meets the needs of flexible wearable devices . In addition, OGESCs exhibit cyclic stability at both low and high temperatures (capacitance decreases by 3.2% after 10,000 cycles), laying a solid foundation for its application in complex and varied environments.
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Green Energy & Environment
·
2023
·
IF 13.3
Yi Wang,Yangyang Wang,Chang Liu,Dongjian Shi,Weifu Dong,Baoliang Peng,Liangliang Dong,Mingqing Chen
Negatively thermo-responsive 2D membranes, which mimic the stomatal opening/closing of plants, have drawn substantial interest for tunable molecular separation processes. However, these membranes are still restricted significantly on account of low water permeability and poor dynamic tunability of 2D nanochannels under temperature stimulation. Here, we present a biomimetic negatively thermo-responsive MXene membrane by covalently grafting poly (N-isopropylacrylamide) (PNIPAm) onto MXene nanosheets. The uniformly grafted PNIPAm polymer chains can enlarge the interlayer spacings for increasing water permeability while also allowing more tunability of 2D nanochannels for enhancing the capability of gradually separating multiple molecules of different sizes. As expected, the constructed membrane exhibits ultrahigh water permeance of 95.6 L m −2 h −1 bar −1 at 25 °C, which is eight-fold higher than the state-of-the-art negatively thermo-responsive 2D membranes. Moreover, the highly temperature-tunable 2D nanochannels enables the constructed membrane to perform excellent graded molecular sieving for dye- and antibiotic-based ternary mixtures. This strategy provides new perspectives in engineering smart 2D membrane and expands the scope of temperature-responsive membranes, showing promising applications in micro/nanofluidics and molecular separation.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Lun Zhang,Huiyuan Zhang,Xiangtian Yu,Liqiang Xu,Dong Wang,Xingyuan Lu,Aimin Zhang
Two-dimensional transition metal carbides (Ti3C2Tx MXene) have emerged as new candidates for applications in multifunctional devices owing to their outstanding performance. However, these electronic devices are easily disturbed by water, breakage, oxidation during use, and limited energy resources. To solve these problems, herein, inspired by nature, a novel superhydrophobic, healable photothermal deicing and photodetector (SHPP) with a “papillary structure” is successfully fabricated for the first time, by a simple layer-by-layer assembly spraying process with 0D/1D/2D nanomaterials. As a result, the superhydrophobic modified 2D MXene coating (FM coating) on the SHPP sensor exhibits outstanding self-cleaning, long-term durability (>20 days), as well as excellent photothermal deicing performances under near-infrared light. Meanwhile, the unique semiembedded nano-ZnO/1D silver nanowire supports the sensor with desirable photoelectric performance with UV light and a fast response time (∼1 s), and good cycle stability. Moreover, benefiting from the transparent self-healing substrate, the photothermal deicing and photodetector properties can be restored at room temperature. The bioinspired structures and function mechanisms offer SHPP sensors great potential for the utilization of clean light energy, sensing, self-cleaning, anti-icing, and so forth.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Rongting Guo,Wei Li,Ruiqin Huang,Mengqi Chen,Zheng Liu,Guo-Cheng Han
Herein, sandwich-like Ti 3 C 2 T x MXene/SnO 2 quantum dots composites were synthesized as sulfur host, aiming to alleviate the shuttle effect of polysulfides present in lithium-sulfur batteries. SnO 2 quantum dots (SnO 2 QDs) were introduced into the interlayer of MXene through a simple electrostatic self-assembly method, and the mass fraction of SnO 2 QDs was controlled to construct sandwich MXene/SnO 2 QDs. While SnO 2 QDs effectively alleviating the stacking tendency of MXene, Ti and Sn co-chemisorb polysulfides and the interlayer structure physically confines polysulfides. Significantly, the synergistic effect between MXene with SnO 2 QDs effectively alleviates the shuttle effect of polysulfides and buffers the volume expansion. Meanwhile, with the help of the catalysis of SnO 2 QDs, the liquid-solid reaction kinetics of lithium polysulfides converting to Li 2 S 2 /Li 2 S is accelerated. Electrochemical test results showed that the MXene/SnO 2 QDs/S cathode has a high initial discharge specific capacity (1147.6 mAh g −1 at 0.1 C, while MXene/S is only 615.4 mAh g −1 ), as well as excellent rate performance and cycling stability in Li-S batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Beibei Ma,Fu Chen,Yongzhi Cheng,Xian Wang,Shuoqing Yan,Rongzhou Gong,Hui Luo
High-performance microwave absorption materials are considered to be an effective solution to the increasing electromagnetic pollution. In this work, Ti 3 C 2 T x MXene@NiFe-layered double hydroxide (NiFe-LDH) derived multi-interfacial FeNi 3 /TiN@nitrogen-doped carbon (NC)@magnetic multiwalled carbon nanotube composites were prepared by a hydrothermal process and subsequent carbothermal reduction. The phase compositions, morphology, defects and electromagnetic parameters of the composites can be regulated by the thermal treatment temperature. The reflection loss value of the composite with a thickness of only 1.6 mm can reach − 43.75 dB when the heat treatment temperature is 900 °C, and the effective absorption bandwidth is 5.5 GHz with a thickness of 2.12 mm when the heat treatment temperature is 700 °C. The synergistic effects among the associated dielectric loss, magnetic loss and the impedance matching of the samples are also systematically investigated. This work provides a new perspective and an effective approach for acquiring MXene hybrids derived high-performance microwave absorbing materials.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Chuang Wang,Qin-Chao Wang,Ke-Xin Wang,Michiel De Ras,Kaibin Chu,Liang-Liang Gu,Feili Lai,Sheng-You Qiu,Hele Guo,Peng-Jian Zuo,Johan Hofkens,Xiao-Dong Zhu
Ambient electrocatalytic nitrogen fixation is an emerging technology for green ammonia synthesis, but the absence of optimized, stable and performant catalysts can render its practical application challenging. Herein, bimetallic NiCo boride nanoparticles confined in MXene are shown to accomplish high-performance nitrogen reduction electrolysis. Taking advantage of the synergistic effect in specific compositions with unique electronic d and p orbits and typical architecture of rich nanosized particles embedded in the interconnected conductive network, the synthesized MXene@NiCoB composite demonstrates extensive improvements in nitrogen molecule chemisorption, active area exposure and charge transport. As a result, optimal NH 3 yield rate of 38.7 μg h −1 mg cat. −1 and Faradaic efficiency of 6.92% are acquired in 0.1 M Na 2 SO 4 electrolyte. Moreover, the great catalytic performance can be almost entirely maintained in the cases of repeatedly-cycled and long-term electrolysis. Theoretical investigations reveal that the nitrogen reduction reaction on MXene@NiCoB catalyst proceeds according to the distal pathway, with a distinctly-reduced energy barrier relative to the Co 2 B counterpart. This work may inspire a new route towards the rational catalyst design for the nitrogen reduction reaction.
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