Nanomaterials
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2022
·Vol. 12
·期 24
·4464
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IF 5.719
Baohui Zhang,Chong Li,Min Li,Chen Fu,Ran Tao,Honglang Li,Jingting Luo
Nitrogen dioxide is one origin of air pollution from fossil fuels with the potential to cause great harm to human health in low concentrations. Therefore, low-cost, low-power-consumption sensors for low-concentration NO2detection are essential. Herein, heterojunction by SnO2quantum wires, a traditional metal oxide NO2sensing material, and Ti3C2TxMXene, a novel type of 2D layered material, was synthesized using a simple solvothermal method for enhancing gas-sensing performance and reducing operating temperature. The operating temperature was reduced to 80 °C, with a best performance of 27.8 and a fast response and recovery time (11 s and 23 s, respectively). The SnO2and Ti3C2TxMXene composite exhibits high speed and low detection limit due to the construction of the heterojunction with high conductive Ti3C2TxMXene. The selectivity and stability of gas sensors are carried out. This could enable the realization of fast response, high-sensitivity, and selective NO2sensing under low operating temperatures.Keywords:Ti3C2TxMXene;SnO2;gas sensor;NO2;nanocomposite
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高影响因子
Advanced Science
·
2022
·Vol. 10
·期 2
·2204041
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IF 17.521
Ningning Liu,Lanlan Yu,Baojun Liu,Fei Yu,Liqing Li,Yi Xiao,Jinhu Yang,Jie Ma
Constructing faradaic electrode with superior desalination performance is important for expanding the applications of capacitive deionization (CDI). Herein, a simple one-step alkalized treatment for in situ synthesis of 1D TiO 2 nanowires on the surface of 2D Ti 3 C 2 nanosheets, forming a Ti 3 C 2 -MXene partially derived hierarchical 1D/2D TiO 2 /Ti 3 C 2 heterostructure as the cathode electrode is reported. Cross-linked TiO 2 nanowires on the surface help avoid layer stacking while acting as the protective layer against contact of internal Ti 3 C 2 with dissolved oxygen in water. The inner Ti 3 C 2 MXene nanosheets cross over the TiO 2 nanowires can provide abundant active adsorption sites and short ion/electron diffusion pathways. . Density functional theory calculations demonstrated that Ti 3 C 2 can consecutively inject electrons into TiO 2 , indicating the high electrochemical activity of the TiO 2 /Ti 3 C 2 . Benefiting from the 1D/2D hierarchical structure and synergistic effect of TiO 2 and Ti 3 C 2 , TiO 2 /Ti 3 C 2 heterostructure presents a favorable hybrid CDI performance, with a superior desalination capacity (75.62 mg g −1 ), fast salt adsorption rate (1.3 mg g −1 min −1 ), and satisfactory cycling stability, which is better than that of most published MXene-based electrodes. This study provides a feasible partial derivative strategy for construction of a hierarchical 1D/2D heterostructure to overcome the restrictions of 2D MXene nanosheets in CDI.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-11
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IF 6.408
Wang Jing,Xu Wei,Zhou Lin,Zhang Tianqi,Yang Na,Wang Min,Luo Xuemei,Jin Lu,Zhu Huaijun,Ge Weihong
The peroxidase-like activity of MXene@Fe 3 O 4 nanocomposites and the relevant colorimetric application have been investigated for the first time. According to a kinetic study, MXene@Fe 3 O 4 nanocomposites displayed higher peroxidase activity than their individual components, and the catalytic process followed a ping-pong mechanism. The improved peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was obtained due to the synergetic impact of the Fe 3 O 4 and MXene phases, the huge ion-accessible interface, and quick electron transfer channels in the nanocomposites. In the presence of hydrogen peroxide (H 2 O 2 ), the MXene@Fe 3 O 4 nanocomposites can catalyze the reaction of the colorless substrate 3, 3, 5, 5-tetramethylbenzidine (TMB) into oxidized TMB which revealed a blue color at 652 nm. After the introduction of glutathione (GSH), the blue color was gradually fading owing to the hydroxyl radical scavenging effect of glutathione. A colorimetric detection platform based on the peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was developed for H 2 O 2 and GSH with a detection limit of 0.4 μM and 0.5 μM, respectively. The calibration plot for glutathione detection is calculated by absorbance difference at 652 nm, which ranged from 0.5 to 10 μM with a detection limit of 0.2 μM. The recoveries of GSH with different concentrations ranged from 93.76 to 108.50% and the relative standard deviation from 0.30 to 5.96%. This work significantly extends the application of MXene@Fe 3 O 4 nanocomposites in the construction of colorimetric sensors and reveals a satisfactory result in real sample analysis. Graphical Abstract
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 44
·23531-23541
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IF 14.511
Fei Yu,Zhengqu Yang,Xiaochen Zhang,Peiyu Yang,Liqing Li,Jie Ma
MXenes have promising applications in capacitive deionization (CDI) due to their excellent electrical conductivity, tunable layer structure and hydrophilic surface. However, the electrochemical performance and water stability of MXenes would be limited by the large number of terminations on their surface. In this work, we obtained VS2/V2CTx nanocomposites by in situ partial derivatization of MXene to enhance electrochemical performance and slow down its own oxidation, and the resulting material was used as a cathode for CDI desalination. The TOPSIS-Entropy weight model was first used to achieve multi-objective optimization, realizing a salt adsorption capacity of 166.83 mg g−1, a salt removal rate of 3.67 mg g−1 min−1 and an energy consumption of only 0.256 kW h kg−1-NaCl. It also showed good stability over 60 CDI cycles. The fast salt removal rate and high desalination capacity of VS2/V2CTx can be explained by the synergy between the pseudocapacitive and battery behaviors of the VS2/V2CTx hybrid material. In situ electrochemical analysis based on electrochemical quartz crystal microbalance (EQCM) demonstrated that the desalination process is reversible and that the deionization mechanism is a combination of faradaic reaction (removal of Na+·4H2O) and intercalation pseudocapacitance (removal of desolvated Na+). This work shows that VS2/V2CTx, as a partially derived MXene material, provides a new solution to improve the stability and electrochemical properties of MXenes.
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Nanoscale
·
2022
·Vol. 14
·期 48
·18133-18142
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IF 8.307
Fushuo Wu,Zhihua Tian,Peiying Hu,Jingwen Tang,Xueqin Xu,Long Pan,Jian Liu,Peigen Zhang,ZhengMing Sun
Lightweight and flexible multifunctional materials with excellent electromagnetic interference (EMI) shielding and Joule heating performances are highly demanded for smart and wearable electronics. In this work, polyacrylonitrile (PAN) nanofiber films are prepared by electrospinning and then coated with polypyrrole (PPy) via vapor deposition, yielding a continuous three-dimensional (3D) conductive network of PAN@PPy. Ti3C2Tx MXene nanosheets with high electrical conductivity are sprayed on the PAN@PPy film to enhance its EMI shielding performance. The as-prepared PAN@PPy/MXene films (55 μm thick) exhibit a high EMI shielding effectiveness (SE) of 32 dB, achieving an extraordinarily high normalized surface-specific SE (SSE/t) of up to 17 534.5 dB cm2 g−1 from 8.2 to 12.4 GHz; simultaneously, the temperatures of PAN@PPy/MXene films can be driven up to 170.5 °C at an input voltage of 4 V, and exhibit fast-response, stable, and long-term Joule heating performance. The high SSE/t and efficient Joule heating ability of the films bode potential applications in smart and wearable devices.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tangdong Feng,Yiwen Hu,Xue Chang,Wanxia Huang,Daoyuan Wang,Hongfu Zhu,Tianyu An,Wenping Li,Kun Meng,Xueguang Lu,Basanta Roul,Sujit Das,Hua Deng,Kirill I. Zaytsev,Li-Guo Zhu,Qiwu Shi
The dynamic control of terahertz (THz) wave transmission on flexible functional materials is a fundamental building block for wearable electronics and sensors in the THz range. However, achieving high-efficiency THz modulation and low insertion loss is a great challenge while maintaining the excellent flexibility and stretchability of the materials. Herein, we report a Ti3C2Tx MXene/waterborne polyurethane (WPU) membrane prepared by a vacuum-assisted filtration method, which exhibits excellent THz modulation properties across stretching. The hydrophilic Ti3C2Tx MXene and WPU enable the uniform 3D distribution of Ti3C2Tx MXene in the WPU matrix. Particularly, the stretchability with the maximum strain of the membranes can reach 200%, accompanied by dynamic tuning of THz transmittance for more than 90% and an insertion loss as low as −4.87 dB. The giant THz modulation continuously decreases with MXene content per unit area, accompanied by a lower density of the MXene interface and diminished THz absorption during stretching. Such a design opens a pathway for achieving flexible THz modulators with a high modulation depth and low insertion loss, which would be used for THz flexible and wearable devices.
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CHEMOSPHERE
·
2023
·
IF 8.8
Langrun Song,Jun Nan,Bohan Liu,Fangmin Wu
Excessive phosphorus in water causes environmental security problems like eutrophication . Advanced two-dimensional material MXene has attracted raising attention in aquatic adsorption, while lack of selectivity and difficult recovery limit its application in phosphate removal . In this study, Ti 3 C 2 -MXene embedded zirconium-crosslinked SA (MX-ZrSA) beads were synthesized and their phosphate adsorption performance under different conditions was assessed. Investigations using SEM/EDS, XRD, BET, TGA and contact angle meter reveal that the addition of Ti 3 C 2 -MXene enhanced the thermal stability, mechanical strength, hydrophilicity, and formed loose network-like mesoporous inner structure with large surface area. The theoretical maximum adsorption capacity was 492.55 mg P/g and was well fitted by Freundlich and optimized Langmuir models. The Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analysis showed that chemisorption was involved, and the formation of Zr–O–P and Ti–O–P complexes accounted for high selectivity and affinity to phosphate. The adsorption experiments in real waters and lab-scale continuous flow Anaerobic-Anoxic-Oxic reactor further indicated the application potential of MX-ZrSA beads. Our study will provide insight into MXene and SA aerogel synergistic adsorption of aquatic contaminants and help with the removal and recovery of finite phosphorus resource.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Xinyu Ma,Aiqi Wang,Jinlei Miao,Tingting Fan
Efficient wastewater treatment under harsh conditions remains a great challenge, while traditional filtration membranes are inefficient to meet the demands due to its poor chemical resistance as well as the “trade-off” effect between high permeability and selectivity. Herein, a chemical-resistant 2D lamellar membrane simultaneously with high flux and rejection for harsh environmental wastewater treatment was proposed, via assembled small sized graphene oxide nanosheets (NGO) layer-by-layer on polyphenylene sulfide (PPS) while hetero-intercalated with MXene. As the performance of 2D laminated membranes is determined by the length/tortuosity of transport channels and interlayer spacing between the flakes, NGO nanosheets were sonicated into small sizes (<500 nm) and intercalated with MXene to engineer shorter/less tortuous transport pathways while tuning the interlayer spacing for fast and selective separation. The membranes exhibit remarkably high-water permeability (up to 136.68 L·m −2 ·h −1 ·bar −1 ) while simultaneously with excellent retention (>99.99 %) for various dyes (molecular weight 288.77–1017.65) at the NGO/MXene ratio of 1/7, which is much higher than most reported membranes. Meanwhile, the Ti-O-C covalent bonding between NGO and MXene nanosheets also enables stable ultrafast water transmission and anti-swelling stability. The PPS-NGO/MXene membranes could still exhibit excellent separation performance even under various harsh environments (strong acids, bases, high pressures, high temperatures, bacteria, organic solvents), which holds great promise for sustainable wastewater treatment under harsh conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Liping Zhang,Xiangchuan Zhao,Zhaoyun Chu,Qing Wang,Yue Cao,Jiao Li,Wu Lei,Jun Cao,Weimeng Si
Rational design of transition metal catalysts with robust and durable electrocatalytic activity for hydrogen evolution reactions (HER) is extremely important for renewable energy conversion and storage, as well as water splitting. Heteroatom doping has emerged as a feasible strategy for enhancing electrocatalytic activity. Here, cobalt nanoparticles (Co-NPs) were coated with nitrogen-doped carbon nanotubes (NCNTs) prepared via an in situ growth on accordion-like Ti 3 C 2 T x -MXene (Co-NCNT/Ti 3 C 2 T x ). Such an intriguing structure showed great features: abundant anchoring sites for NCNT in situ growth, intimate integration of Co-NPs and NCNTs, high-speed electron transfer between 1D NCNTs and 2D Ti 3 C 2 T x -MXenes, and a large number of effective catalytic active sites. This Co-NCNT/Ti 3 C 2 T x hybrid catalyst was demonstrated to possess excellent HER performance with low overpotential ( η 10 , 190 mV), small Tafel slope (78.4 mV dec −1 ), large electrochemically active surface area, and good long-term stability, thus outperforming many reported electrocatalysts . The present strategy provided a facile route for the design of transition metal HER catalysts with NCNT and MXene .
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MATERIALS & DESIGN
·
2022
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IF 9.417
Ningmin Duan,Zhenyu Shi,Zhaohui Wang,Bin Zou,Chengpeng Zhang,Jilai Wang,Jianren Xi,Xiaoshuai Zhang,Xianzhi Zhang,Guilong Wang
It is a challenge to design Ti 3 C 2 T x MXene-based electromagnetic interference (EMI) shielding composites with excellent mechanical properties. Herein, a highly robust, flexible and durable Ti 3 C 2 T x MXene/carbon fiber fabric/thermoplastic polyurethanes (Ti 3 C 2 T x MXene/CFf/TPU) composite was fabricated through simple electrohydrodynamic atomization deposition, layer-by-layer stacking and hot pressing technology. The synergistic strengthening effect of van der Waals forces and covalent bonds can improve the tensile strength of the composite up to170.2 MPa, which is far greater than that of other MXene-based composites previously reported. In addition, the EMI shielding performance of the Ti 3 C 2 T x MXene/CFf/TPU composite also improved with increasing MXene mass fraction, reaching 40.4 dB, which can be attributed to the dielectric loss provided by conductive fillers and the enhanced absorption within the sandwich structure. More interestingly, the composite retained excellent resistance stability, EMI-SE stability and flexibility, even after multiple bending and releasing cycles. This work provides a facile and environmentally-friendly method for preparing composites with excellent EMI shielding properties and mechanical properties, which may provide more possibilities for applications in intelligent wear and electronic wireless communication equipment.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Baolei Shen,Xilin Liao,Xuefei Zhang,Hai-Tao Ren,Jia-Horng Lin,Ching-Wen Lou,Ting-Ting Li
The supercapacitor is a kind of electrochemical energy storage element, has attracted widespread attention, however, it is limited by a lack of ideal electrode materials with excellent cycle stability and high specific capacitance. To address this issue, we prepared Nb 2 CTx MXene-framework coated with Co 3 O 4 to construct a robust 2D cross-linked structure. In this design, the self-assembly of Co 3 O 4 between Nb 2 C MXene layers can effectively prevent the self-stacking of MXene sheets. The high conductivity and abundant active groups on the surface of MXenes provide a large number of active sites for the uniform distribution of Co 3 O 4 on Nb 2 C MXene. The Co-MXene electrode achieves a specific capacitance of up to 1061 F g −1 at the current density of 2 A g −1 , which is higher than the pure Co 3 O 4 electrode and Nb 2 C MXene electrode. The asymmetric supercapacitors (ASCs) of Co-MXene//AC delivers specific energy densities (Es) of 60.3, 42.5, 31.0, 19.7 Wh kg −1 at specific power density (Ps) of 0.67, 2.0, 3.4, and 6.8 kW kg −1 , respectively. The capacitance retention rate of 93% after 1000 cycles at 5 A g −1 . The study provides a valuable guideline for fabricating satisfactory electrochemical energy storage devices by a feasible method.
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JOURNAL OF POWER SOURCES
·
2022
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IF 9.794
Zhaoyang Chen,Wenqiong Li,Xing Yang,Chujun Ke,Hanxue Chen,Qingyu Li,Jiaming Guo,Yun He,Zeping Guo,Xiaoguang Liang
Flexible and rechargeable zinc–air batteries (ZABs) are promising energy sources for wearable electronic devices due to their high energy density and safe operation. However, the performance of quasi-solid-state electrolytes gradually degrades during the ion-exchange process, mainly because of water evaporation on the open cathode side , which reduces the lifespan of ZABs. Thus, a novel electrolyte needs to be designed that can retain water to increase the cycle lifespan of ZABs. Herein, we propose a near-neutral gel polymer electrolyte (GPE) composite comprising polyvinyl alcohol (PVA) and hydroxy-functionalized MXene . Benefiting from the three-dimensional porous network and numerous surface-functionalized hydroxy groups , the network of alkalized MXene inside the PVA matrix serves as a water reservoir , resulting in enhanced water retention, and therefore, a high ionic conductivity of 77.6 mS cm −1 . The molecular dynamic simulations validate stronger hydrophilicity of alkalized MXene surface for water molecular than the pristine MXene. Resultantly, the assembled ZABs show a long cycle lifespan of 160 h at a current density of 2 mA cm −2 and a charging–discharging period of 15 min.
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