Materials Today Energy
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2022
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IF 9.257
Hong Zhang,Yao Chen,Xiaofang Liu,Hengyang Wang,Chengzhi Niu,Sikang Zheng,Bin Zhang,Xu Lu,Guoyu Wang,Guang Han,Xiaoyuan Zhou
SnSe-based materials, comprising nontoxic, eco-friendly and abundant elements, have intrinsically low lattice thermal conductivity , which are promising candidates for thermoelectric conversion. However, unmodified, polycrystalline SnSe reveals poor electrical transport properties due to the lower carrier mobility . Herein, two-dimensional Ti 3 C 2 T x MXene has been incorporated into SnSe matrix by solution synthesis and fast consolidation, which efficiently increases the carrier mobility and concentration; accordingly, the electrical conductivity is improved in the temperature range of 323–523 K. Meanwhile, SnSe/Ti 3 C 2 T x composites achieve diminished lattice thermal conductivity, delivering a low value of 0.41 W m −1 K −1 at 773 K. Ultimately, a peak zT of 0.93 at 773 K is attained in SnSe/Ti 3 C 2 T x composite with addition of 0.3 wt% Ti 3 C 2 T x , representing a 66% increase compared to that of SnSe. This work sheds light on the thermoelectric performance improvement of polycrystalline SnSe by controllably incorporating two-dimensional MXene.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Ao Wang,Hang Xu,Jiawei Fu,Tao Lin,Jun Ma,Mingmei Ding,Li Gao
The introduce of a nanomaterial interlayer between the substrate and polyamide is identified as a promising strategy to construct highly performed membranes. Two-dimensional (2D) materials are potential candidates as interlayer for advanced thin-film nanocomposite interlayer (TFNi) membranes. Nevertheless, low permeability, selectivity and long-term stability are still critical issues in TFNi membrane manufacture. Herein, a scalable approach for constructing TFNi membranes was implemented using stacked MXene nanosheets as interlayer, wherein the Fe 3 O 4 nanoparticles worked as the sacrificial template to regulate the interlayer spacing of the 2D channels. SEM , XPS, water contact angle, and zeta potential were used to characterize the physical and chemical properties of prepared TFNi membranes, and the results shows that the presence of MXene interlayer increased the hydrophilicity, thinness and roughness of polyamide layer compared to that of pure TFC membranes. Besides, the enlarged interlayer channel after the sacrifice of the Fe 3 O 4 nanoparticles greatly boosted the transport of the water molecules. The resultant membranes exhibited nearly double fold of water flux (66.4 ± 3.45 L·m −2 ·h −1 ) and higher selective separation factor (48.4) compared with those prepared without interlayer, while the outstanding salt rejection (>97 %) was maintained. This work achieves an innovative strategy for multifunctional polyamide nanofiltration membrane construction.
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Journal of Energy Chemistry
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2022
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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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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Xian Liu,Like Chen,Yang Yang,Liping Xu,Junyong Sun,Tian Gan
Rational tailoring of hollow and porous bimetallic structures with excellent electrocatalytic performance is appealing yet challenging. Further, combining independent bimetallic nanoparticles with flexible two-dimensional substrate by forming stable heterocomplex is still highly desired for electrocatalysis. Herein, hierarchical PtCu alloy octahedrons with hollow interiors and nanosheet-assembled nanoshells were synthesized by a facile and efficient chemical transformation strategy using Cu 2 O as sacrificial templates. Such octahedral PtCu nanocages displayed significantly enhanced electrocatalytic activity owing to their unique hollow and porous architectures which provided easy access for analytes to the catalyst surface. Thereafter, introduction of Ti 3 C 2 T x MXene was realized via simple incubation of Ti 3 C 2 T x in solution containing the 3-aminopropyltriethoxysilane-capped PtCu, and their electrostatic interaction guaranteed the firm adsorption of PtCu nanocages on Ti 3 C 2 T x nanosheets. It turned out that the sensitivity of the hybrid sensor was remarkably improved for electrochemical monitoring of endocrine disrupting pollutants in water, exhibiting ultrawide linear ranges and sub-nanomole detection limits. The eminent electrode performance is attributed to the high specific area, fast electrochemical kinetics, decent electrical catalytic ability, and the synergistic effect between Pt, Cu, and MXene.
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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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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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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Jinglun Guo,Cheng Zeng,Pengxi Wu,Guoqiang Liu,Feng Zhou,Weimin Liu
Low interlaminar shear stress, high mechanical strength, and tunable structure make Ti3C2Tx MXene a burgeoning star as solid lubricants and lubricant additives. Although surface modification strategy can improve its compatibility with base oils, it will eventually settle due to gravity. Additionally, base oils are prone to leakage, creep, and volatilization, which limit their application. To address these issues, supramolecular gels with surface-modified Ti3C2Tx were conceived. Apart from the lubrication effect, the high thermal conductivity of Ti3C2Tx MXene accelerated the phase transition rate of supramolecular gels. The thermal-reversible and creep-resistant properties distinguish them from other conventional lubricants. The tribological tests showed that the 500 solvent neutral (SN) supramolecular gel with 0.10 wt % Ti3C2Tx-octadecylphosphonic acid (Ti3C2Tx-ODPA) reduced the coefficient of friction (COF) by 46.32% and wear volume by 81.18% compared with pure 500SN oil. Moreover, they also performed well in load-carrying capacity, temperature tolerance, and speed adaptability. This work puts forward a new approach to prepare MXene-based lubricants tailored for some severe lubrication conditions. These exceptional features enable their application in rolling bearings, some gears, and other low maintenance mechanisms.
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ACS Applied Materials & Interfaces
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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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ACS Nano
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2022
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IF 18.027
Zhiming Deng,Lulu Li,Pingping Tang,Chenyang Jiao,Zhong-Zhen Yu,Chong Min Koo,Hao-Bin Zhang
Two-dimensional transition metal carbide/nitride (MXene) conductive inks are promising for scalable production of printable electronics, electromagnetic devices, and multifunctional coatings. However, the susceptible oxidation and poor rheological property seriously impede the printability of MXene inks and the exploration of functional devices. Here, we proposed a controllable surface grafting strategy for MXene flakes (p-MXene) with prepolymerized polydopamine macromolecules to protect against water and oxygen, enrich surface chemistry, and significantly optimize the rheological properties of the inks. The obtained p-MXene inks can adapt to screen-printing and other high-viscosity processing techniques, facilitating the development of patterned electromagnetic films and coatings. Interestingly, the printed MXene polarizer can freely switch and quantitatively control microwave transmission, giving an inspiring means for smart microwave modulation beyond the commonly reported shielding function. Moreover, the introduction of polydopamine nanoshell enables the infrared emissivity of MXene coating to be adjusted to a large extent, which can produce infrared anti-counterfeiting patterns in a thermal imager. Therefore, multifunctional antioxidant p-MXene inks will greatly extend the potential applications for the next-generation printable electronics and devices.
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SYNTHETIC METALS
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2022
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IF 4
Yuhua Dong,Yuanyuan Yin,Xueyan Du,Chunmei Liu,Qiong Zhou
A near-infrared (NIR) light-induced shape memory-assisted self-healing coating was developed by incorporating Ti 3 C 2 MXene and polyaniline (PANI) composites into epoxy resin. Ti 3 C 2 thin nanosheets were obtained by etching Ti 3 AlC 2 powders with HCl and LiF and then intercalating with tetramethylammonium hydroxide. Then MXene@PANI composites were synthesized through chemical oxidation . Result of ultraviolet–visible spectroscopy showed two obvious characteristic peaks at visible and NIR light range, indicating that the MXene@PANI composite could be used as photothermal agents to induce shape memory effect of the epoxy resin. Results of electrochemical impedance spectra and scanning vibrating electrode technique indicated that the addition of 5 wt% MXene@PANI to the epoxy resin coating could improve its protection performance, and own 91% self-healing efficiency due to the NIR absorbing ability of MXene and PANI and the passivation of PANI. Linear scanning voltammetry measurements indicated that the shape memory effect and self-healing performance of the epoxy resin matrix were affected by the corrosion product in the scratched area.
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Nano Energy
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2022
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IF 19.069
Jiacheng Fan,Mengmeng Yuan,Libo Wang,Qixun Xia,Haiwu Zheng,Aiguo Zhou
In this work, Ti 3 C 2 MXene supported by cotton fabric was used as electrode layer to construct a novel triboelectric nanogenerator (TENG) as self-powered flexible sensors. The electrode layer was made by immersing cotton fabric in the mixing suspension of Ti 3 C 2 MXene and cellulose nanofibers (CNFs). In the electrode layer, Ti 3 C 2 MXene provides the electrical conductivity and electrical negativity. The fabric substrate provides the strength and flexibility of the electrode layer. The MXene on the surface of electrode layer can lose electrons if it frictionally contacts the friction layer of TENG, silicone rubber. The TENG can produce open-circuit voltage up to 400 V in single-electrode mode during the press-release cycles of a human’s palm. The harvested energy can directly power 32 green light emitting diodes connected in series and charge capacitors. The TENG can sense the mass of touched steel object (2–200 g) with good repeatability and linear relationship. The TENG can be stretched up to 100 % of the original length and can produce different voltage signals according to the bending/folding angles. The TENG exhibits excellent flexibility and sensing performance to be applied as self-powered flexible sensors to monitor various physiological movements of the human body.
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POLYMER DEGRADATION AND STABILITY
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2022
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IF 5.204
Congling Shi,Mei Wan,Zhengbo Hou,Xiaodong Qian,Honglei Che,Yueping Qin,Jingyun Jing,Jian Li,Fei Ren,Bin Yu,Ningning Hong
Thermoplastic polyurethane (TPU) is the most used polyurethane, but its highly flammable characteristic restricts its extensive use. In this work, Co-MOF@MXene hybrids flame retardants were synthesized and incorporated into TPU . The flame-retardant characteristics of TPU composites were investigated by cone calorimeter test and thermogravimetric analyzer. Compared with TPU, the peak heat release rate and total heat release rate of TPU/Co-MOF@MXene composites were reduced by 28.3% and 14.5%, respectively; and the smoke production rate and total smoke production of the composites with only 2 wt% Co-MOF@MXene hybrids were also reduced by 58.8% and 47.5%, respectively. Furthermore, the char residues of TPU/Co-MOF@MXene composites were about 2 times that of pure TPU. Systematical characterizations were then carried out to investigate the flame retardant mechanism of Co-MOF@MXene hybrids, highlighting the barrier effects of MXene combined with the catalytic effect of Ti and Co. The hybrids flame retardants greatly benefit the further development of TPU nanocomposites.
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