SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Haoran Song,Shiting Pan,Yuwei Wang,Yang Cai,Wei Zhang,Yongming Shen,Changping Li
There exists an obvious contradiction between Cu(III) generation and Cu(I) contribution in reductants enhanced Cu(II)/peroxymonosulfate (PMS) process because the involved electron transfer pathways were always ignored in previous studies. This study investigated the MXene-mediated electron transfer mechanism in Cu(II)/PMS for the first time. The introduction of MXene significantly promoted atrazine degradation under acidic condition because the in-situ generation of Cu(I) was an excellent activator for PMS. Under alkaline condition, although addition of MXene generated a large amount of Cu(I), the degradation of atrazine was inhibited due to that the conversion of Cu(I) to Cu(III) was interrupted. The strong metal-support interaction (SMSI) altered the reactive intermediate species from Cu(III) (two-electron transfer) to hydroxyl radical (HO • ) and sulfate radical (SO 4 •- ) (one-electron transfer) under alkaline condition. This work proposed a novel MXene-mediated electron transfer mechanism and improved the understanding of Cu(III)/Cu(I) transformation pathway.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Cheng Han,Huan Zhang,Quan Chen,Tao Li,Lingjian Kong,Hui Zhao,Lirong He
Directional sensors endowed by inherent anisotropic structure have drawn great attention in intelligent sensing systems. Unidirectional lyophilization is the mainstream technique to architect anisotropic structure particularly for water dispersible systems as the ice template can be readily removed at the melting point of water (0 °C). However, it is impractical for water insoluble polymers such as piezoelectric polymer systems as it features extremely low lyophilization temperature (for instance, −61 °C). So far, no piezoelectric polymer derived anisotropic devices has been realized. In this work, for the first time, we succeeded the constructing of anisotropic PVDF/Mxene device with directionally oriented micropores through delicate formulation design which enables the maintaining of oriented template even at temperature above 0 °C. As a result, the as-fabricated PVDF/Mxene composite foam exhibits distinct anisotropic behavior, featuring compressive modulus along the direction of penetrating microchannels being approximately 1.7 times of that in the orthogonal direction. The anisotropic foam is applied as directional sensor with piezo-current as the output signal, which displays a 3.93-fold higher sensitivity difference in the direction perpendicular to the microchannel than in its orthogonal direction. Moreover, the foam exhibits the highest sensitivity of 41.3nA/kPa over pressure range of 2.5–20 kPa, which outperforms state-of-the-art polymer piezoelectric sensors. This novel strategy provides a practical avenue for architecting water-insoluble polymer-derived devices with anisotropic structure in a green and energy-saving manner, which could spur innovations from the fields of electromagnetic interference shielding, energy storage, piezoresistive, thermal insulation and so on wherever anisotropic characteristic is desired.
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CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Jiao Wu,Aihu Feng,Bingbing Chen,Yang Yu,Le Mi,Yun Yu
MXene Ti 3 C 2 T x and Ti 2 CT x were introduced as CDI electrodes to investigate the effect of oxidation on desalination performance. In NaCl solution, Ti 3 C 2 T x maintained 65.6% of initial desalination capacity (14.05 mg/g) after 38 cycles and Ti 2 CT x maintained 23.5% after 12 cycles (10.14 mg/g). However, in deoxygenated NaCl solution, Ti 3 C 2 T x still maintained 87.8% after 134 cycles while Ti 2 CT x maintained 17.9% after 16 cycles. Subsequent analysis indicated that MXene was partially oxidized to TiO 2 , resulting in an increase of electrical resistance, which ultimately reduced cycling stability. This work implied that deoxygenating seawater is a significant method for the industrial application of Ti 3 C 2 T x .
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Jing Liu,Ninglong Zhang,Jiansen Li,Mingyang Li,Guangxian Wang,Wenli Wang,Yuxia Fan,Shui Jiang,Gaole Chen,Yin Zhang,Xia Sun,Yuan Liu
The bioelectronic tongues based on taste receptors have been emerging with human-like taste perception. However, the practical applications of the receptor-based biosensors were restricted by their narrow and low dynamic ranges. Here, a novel immobilization strategy based on [email protected] /Ti 3 C 2 MXene was developed to immobilize the umami ligand binding domain (T1R1-VFT), to fabricate an umami biosensor for umami substances detection. Through the synergic effect of [email protected] and Ti 3 C 2 MXene, the capacity to load T1R1-VFT was effectively increased, and the response signal was also amplified by approximately 3 times. The proposed biosensor showed an ultrawide dynamic range of 10 −11 –10 −3 M, and a high upper limit of detection, which was closer to the human taste threshold and suitable for detecting foods rich in umami substances. Additionally, the biosensor was successfully applied to detect real samples and analyze the synergistic effects of binary umami substances.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bingzhe Jia,Huailin Yang,Lei Wang,Zhiqi Zhao,Xinming Wu
Compared with most transition metal based electrode materials, 2D M n+1 X n T x has high conductivity and good solvent compatibility. However, its low energy density hinders its application as supercapacitior electrode for electrochemical energy storage applications. Herein, the interface-pillared of Fe-MOF (MIL-100(Fe)) onto Ti 3 C 2 T x MXene layer, which provide rich electrochemical active sites, is achieved, and the MOF nanospheres with MXene nanosheets are subsequently converser into three dimensional multilayer porous nanostructures through the chemical bond couping. Therefore, the MOF nanospheres are anchored between the nansheets of MXene, enabling the fast ion transportation in the three dimensional nanostructures. Menanwhile, the MOF nanospheres prevent the aggregation of MXene nanosheets, and the laminar structure is maintained for more redox reaction sites within the hybrid electrodes through fast charge–discharge cycles. As a result, the MIL-100(Fe)/Ti 3 C 2 T x MXene electrode displays superior energy density (85.53 Wh kg −1 ), which is much higher than the other MXene-based electrodes as far as we know. This design strategy of 2D hybrid electrodes opens up a new way for the commercial application of high perfermance supercapacitor.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Liang Zhou,Huimin Qi,Yang Lei,Jiaxin Yu,Baogang Guo,Ding Zhang
Copolymers of polyimide and polyuria with different fractions were synthesized. Furthermore, Ti 3 C 2 MXene two-dimensional material was obtained by etching Ti 3 AlC 2 with hydrofluoric acid. It was demonstrated that the copolymers displayed outstanding tribological performance than that of pure polymers and the as-synthesized Ti 3 C 2 MXene were endowed with outstanding dispersion in above copolymer. Importantly, when used as a solid lubricant additive at different temperatures, the two-dimensional material showed excellent friction reducing and antiwear properties. That is, blending even a small fraction of Ti 3 C 2 MXene into the copolymer dramatically reduced the friction and wear of the friction pair. SEM mappings and XPS analyses revealed that a continuous tribofilm consisting of a high fraction of tribo-chemical products and TiO 2 was established on the rubbed surfaces, which were significant in improving the lubrication performance at different temperatures.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhichao Li,Xinyu Liu,Xuyun Wang,Hui Wang,Jianwei Ren,Rongfang Wang
Despite the existing advances of Ti 3 C 2 T x MXene as supercapacitor electrode material, its capacitance can be further enhanced through the composite strategy. In this work, the nitrogen-doped superhydrophilic carbon cloth (ENCC) was firstly prepared by N-doping of carbon cloth (CC), and then Ti 3 C 2 T x MXene nanosheets were electrophoretically deposited to yield the binder-free Ti 3 C 2 T x(EPD) /ENCC as supercapacitor electrode material. As a result, the composite electrode exhibited an area-specific capacitance of 2080.1 mF·cm −2 at 1 mA·cm −2 current density. The analysis implied that the varying Ti valence states provided certain psedocapacitance to the capacitance of the as-prepared electrode, though the main contribution was still dominantly from the electric double layer capacitance (EDLC). Further, the assembled symmetric supercapacitor yielded a wide voltage window of 1.8 V, and a good cyclic stability with 91% capacitance retention after 10,000 charge/discharge cycles at 20 mA·cm −2 . Overall, the employed composite strategy enabled the good dispersion of the MXene flakes on the surface of the flexible substrate . Meanwhile, the large number of functional groups (-OH, -F, etc.) on the surface of Ti 3 C 2 T x MXene interacted with the carbon layer through hydrogen bonding effects, which endows it as an ideal electrode for electrochemical capacitors .
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International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 1
·251-260
·
IF 2.328
Fada Wei,Qinghua Liu,Heqiang Liu,Guohong Wang,Minghang Li,Mingxing Li,Xingmin Liu
The proliferation of electronic devices and wireless communication is leading to serious electromagnetic (EM) interference. In this work, Ti 3 C 2 /cement composites were developed as high efficiency EM functional materials by introducing exfoliated Ti 3 C 2 T x MXene with cement for green buildings with EM shielding function. In the composites, few-layered Ti 3 C 2 MXene were dispersed homogeneously throughout the cement matrix. The EM properties of the composites were studied as a function of the MXene content. With increasing MXene content, real and imaginary part of permittivity was significantly improved owing to the polarization and electrical conduction caused by the MXene phase. Composites with 15 wt.% MXene showed good EM absorbing properties with a maximum effective absorbing bandwidth of 2.67 GHz. Strong EM shielding can be achieved when MXene content increased to 25 wt.%. The EM shielding effectiveness of such composites was higher than 22.0 dB, and the dominating shielding mechanism was EM absorption. This work finds new materials for the development of advanced green buildings with EM shielding function.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
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IF 7.312
Yongcong Liu,Qingquan Lin,Guangyong Zeng,Liyi Zhang,Yinjie Zhou,Arijit Sengupta
Nature inspired ‘green’ method has been reported for the fabrication of nanoparticles from the plant derived polyphenol tannic acid (TA) and 3-aminopropyltriethoxysilane (APTES). In present investigation, TA-APTES nanoparticles decorated MXene nanosheets were acted as active layers and TA-APTES@MXene composite membrane were constructed by vacuum self-assembly on cellulose acetate support in order to improve membrane performance. The modified membrane showed an excellent hydrophilicity with a water flux of 5990.11 L·m −2 ·h −1 at 0.1 MPa, which is 15 times higher than pure MXene membrane. Moreover, the removal ratios of three different types of oil/water emulsions (petroleum ether, lubricating oil and vegetable oil) were found to be more than 98%. More importantly, the highly oleophobic membrane surface maintained a relatively high separation performances after four consecutive cycles of performances. This investigation achieves a leap of MXene-based membrane materials from nano- to micro-scale, which provides valuable insights in the field of oil/water separation.
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CARBON
·
2021
·
IF 9.594
Chao Zhang,Huifeng Dong,Binling Chen,Tianxu Jin,Jun Nie,Guiping Ma
The development of bifunctional activity and long durability of ORR/OER catalyst is vital for realizing the practical application of Zn–air batteries (ZAB). Herein, 3D-structured bifunctional catalysts , CoFe nanoalloy decorated carbon nanotubes (CNT) anchoring with 2D MXene (Fe/Co-CNT@MXene-T), were prepared and fabricated as the cathode for both aqueous and flexible ZAB. Taking advantages of active sites of CoFe nanoparticles , robust sheath and fast charge transfer provided by CNT and MXene, our optimal catalyst Fe/Co-CNT@MXene-8 exhibited remarkable electroactivities of ORR and OER comparable with the benchmark Platinum carbon (Pt/C) and Ruthenium dioxide (RuO 2 ), respectively. The as-assembled aqueous ZAB with Fe/Co-CNT@MXene-8 as cathode exhibited a high specific capacity of 759 mA h g −1 at a current density of 10 mA cm −2 , and a stable voltage platform in the quick discharge–charge test under a 375h long-lasting operation, superior to those assembled with benchmark commercial catalyst and other reported catalysts. Furthermore, the as-assembled flexible ZAB with Fe/Co-CNT@MXene-8 as cathode also presented excellent durability cycling and showed promising perspectives as future power sources for wearable application. Such high performance was also verified by X-ray absorption near-edge structure (XANES) and supported by density functional theory (DFT) calculation. This work provides a novel view to design highly effective and long-lasting rechargeable ZABs.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 11
·1-9
·
IF 5.833
Xia Yixuan,Ma Yuzhi,Wu Yuntao,Yi Yinhui,Lin Huiyu,Zhu Gangbing
A proof-of-principle concept for free-electrodeposited anodic stripping voltammetry (ASV) sensing of Cu 2+ is proposed by using Ti 3 C 2 T x MXene/carbon black (Ti 3 C 2 T x @CB) nanohybrids as electrode materials. Owing to the high adsorption and reduction capability of Ti 3 C 2 T x towards Cu 2+ , Ti 3 C 2 T x MXene enables Cu 2+ to be immobilized and self-reduced directly to form Cu 0 on the Ti 3 C 2 T x @CB electrode surface. As a result an oxidation peak current appears from the re-oxidation of Cu 0 via differential pulse voltammetry. Carbon black (CB) was introduced to prevent Ti 3 C 2 T x Mxene aggregation and improve the related electron transfer as well as enhance their surface area. After optimizing various conditions, a considerable low limit of detection (4.6 nM) and a wide linear range (0.01–15.0 μM) for Cu 2+ were achieved at the working potential from − 0.3 V to 0.0 V (vs SCE). Relative standard deviation (RSD) of eight individual Ti 3 C 2 T x @CB electrodes is 3.72%, and the recoveries from tap water sample and lake water sample were in the ranges of 97.0–108% and 104–107%, respectively. Graphical abstract
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Yu Fang,Shuang Liu,Xiaolong Li,Xinpeng Hu,Hao Wu,Xiang Lu,Jinping Qu
Encapsulated phase-change materials (PCMs) have been widely studied in the field of solar thermal energy storage due to the advantages of stable shape and repeatability. In this work, a series of potatoes phase-change materials (PPMs) were conceived and synthesized via a common vacuum impregnation method, with biomass porous potatoes (PP) as substrate, polyethylene glycol (PEG) as phase change medium and MXene nanosheets as functional filler . The experimental results show that the introduction of MXene nanosheets not only significantly improve the photo-to-thermal conversion efficiency, but also help to increase the adsorption rate of PEG in PCMs. The PEG percentage of potatoes phase-change material (PPM) increases from 60.9% (PPM-0) to 82.1% (PPM-12.5), melting/freezing enthalpy values are also increases from 94.08 J/g/100.46 J/g of PPM-2.5 to 135.57 J/g/139.88 J/g of PPM-12.5, and its enthalpy efficiency λ and relative enthalpy efficiency η also increase from 57.6%/91.5% to 77.7%/98.3%. The results show that the prepared PPMs can be effectively applied to solar photo-to-thermal energy storage.
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危险品化学品经营许可证（带存储）