DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 44
·16413-16420
·
IF 4
Hankun Tan,Lei Zhang,Kaiyue Gao,Li Sun,Yihe Zhang,Feng Xie
2H phase MoS2 with a two-dimensional nanostructure, high chemical stability and large theoretical capacity has been considered as a potential anode material for lithium-ion batteries. However, some practical problems hinder the direct use of 2H-MoS2 for lithium storage, such as its volume expansion effect that leads to capacity loss and its semiconductor properties that cannot provide sufficient conductivity. Herein, the surface of an MXene with abundant surface groups was modified with CTAB to promote its ability to adsorb MoO42− anions, and then 2H-MoS2 with a few layers was directly grown on the surface of MXene sheets vertically. Thanks to the conductive MXene sheets and the vertically-supported high-capacity MoS2 on them, the as-obtained composite MXene@MoS2 offers enhanced performance in specific capacity, long cycling stability and high rate capability. A reversible specific capacity of 1198 mA h g−1 was retained after 100 cycles at 200 mA g−1 and a specific capacity of 717 mA h g−1 was exhibited at 8000 mA g−1.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
半导体材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Hongxin Tan,Jingren Gou,Xin Zhang,Li Ding,Haihui Wang
The electromagnetic interference (EMI) shielding abilities of MXene-based conductive nanocomposites are promising for ensuring the steady operation of electronic equipment and protecting people from electromagnetic radiation. The development of comprehensive membranes that satisfy all the essential requirements of excellent EMI shielding and infrared (IR) stealth performance remains a significant issue, despite the high EMI shielding capabilities of MXene-based composite membranes . Here, we report a sandwich-structured Ti 3 C 2 T x -MXene/reduced-graphene-oxide (MrG) membrane with high conductivities and abundant interior blowholes for high-performance EMI shielding and IR stealth. Taking advantage of the continuously conductive routes and distinctive porous structures, an 18-μm-thickness MrG membrane shows a high EMI shielding efficiency (EMI SE) of 89.1 dB and a satisfactory absolute EMI SE ( S S E /t) of up to 55282.8 d B ⋅ c m 2 ⋅ g − 1 , which is the best result for MXene-based nanocomposites with similar thickness. Moreover, the MrG membrane also exhibits superior thermal camouflage ability for objects in low-temperature circumstances (like winter) and high-temperature cases (like summer), demonstrating the great promise as high-performance EMI shielding membranes for IR stealth, security protection, and counter-surveillance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhencheng Huang,Tao Huang,Xue Ye,Xingyu Feng,Xiuyuan Yang,Jianneng Liang,Shenghua Ye,Yongliang Li,Xiangzhong Ren,Wei Xiong,Xiaoping Ouyang,Qianling Zhang,Jianhong Liu
Lithium metal is a promising anode material due to its high theoretical capacity and low redox potential. However, lithium metal anode suffers from lithium dendrite, which reduces the cycle stability and reversibility of lithium metal batteries (LMBs). In order to solve this issue, we designed an in-situ polymerization method of organic–inorganic composite materials (methyl methacrylate (MMA)/MXene) to prepare artificial solid-electrolyte interphase (SEI). The as-prepared LMBs exhibit good interfacial contact and high electrochemical performance owing to the charge redistribution effect of MXene layer for decreasing the nucleation energy barrier and on the lithium metal anode. The specific capacity can sustain 106.6 mAh/g even after 1000 h cycles at 1C, and the capacity retention is 80.1 % with LiFePO 4 (LFP) as a cathode material. Therefore, we believe this simple and inexpensive method can effectively restrain the growth of lithium dendrites and improve the cyclic stability and reversibility of the LMBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 10
·3468-3479
·
IF 6.4
Yixin Cao,Chun Zhao,Tianshi Zhao,Yi Sun,Zhengjun Liu,Xianyao Li,Li Yin,Jiangmin Gu,Hao Ren,Xianwei Geng,Jian Yao,Lixing Kang
In the new generation of brain-like optoelectronic visual signal processing and artificial perception systems, floating-gate artificial synaptic devices based on two-dimensional materials represent a feasible route. However, the traditional optoelectronic floating-gate artificial synapse is hindered from further development due to complicated processes, such as the need to fabricate additional tunneling layers and photoresponsive layers. Here, an optoelectronic artificial synapse device based on an MXene floating-gate is fabricated. The self-grown TiO2 layer on the ‘111’ surface of MXene is a natural tunneling layer, enhancing the optical response intensity and memory time of postsynaptic currents. The device responds to photoelectric pulses and simulates basic synaptic properties, including excitatory postsynaptic current, paired-pulse facilitation, and short-term/long-term plasticity. In addition, the neural network based on the properties of the device was used to simulate the process of recognizing and classifying objects in the brain after receiving visual signals. Most importantly, as a proof of concept, simulation analyzes the brain wave signals when the brain receives different external stimuli and identifies the subject's mood by classifying the signals. These results indicate that the optoelectronic artificial synapse based on an MXene floating-gate is promising in the application of next-generation brain-like artificial synapse neuromorphic devices.
研究领域:
神经形态计算
·
材料科学
·
脑科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 45
·455501
·
IF 3.874
Hao Huang,Dan Wang,Ying Zhou,Dongping Wu,Xiaoning Liao,Wanming Xiong,Juan Du,Yanping Hong
Electrochemical sensor has great potential in the detection of small molecules by virtues of low cost, fast response, and easy to miniaturization. However, electrochemical sensing of ochratoxin A (OTA) was seriously hindered by the heavy electrode-fouling effect and poor electrochemical activity inherent from OTA molecular. Herein, two-dimensional titanium carbide (2D Ti3C2) MXene incorporated with carboxylic multiwalled carbon nanotubes (cMWCNTs) was developed as a glassy carbon electrode modifier for rapid and sensitive detection of OTA. Physical characterizations combined with electrochemical techniques revealed that cMWCNTs can not only prevent the restacking of 2D Ti3C2 nanosheets but also facile its electron transfer, leading to a nanohybrid with a high specific surface and good electrocatalytic activity to OTA. Under optimal conditions, the electrochemical sensor showed a good linear response to OTA in a concentration range from 0.09 to 10 μmol·l−1 and a low detection limit (LOD) of 0.028 μmol·l−1. The proposed sensor was impelled successive times to detect OTA, a good repeatability was obtained, indicating the constructed sensor possessed good anti-fouling property. Moreover, satisfactory recoveries between 91.8% and 103.2% were obtained in the real sample analysis of grape and beer, showing that the developed sensing technique is reliable for the screening of trace OTA in food resources.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Yefeng Feng,Li Liu,Hongrong Qiu,Maolin Bo,Wanshan Duan,Qihuang Deng
Utilizing percolation of symmetric MXene filler easily achieves high dielectric constant in polymer/MXene composites. However, percolation leads to low breakdown strength . In present work, we have adopted a new strategy of employing asymmetric bimetallic VTiC MXene filler to fabricate composite dielectrics with highly insulating polyvinyl chloride (PVC) matrix. VTiC filler was prepared via heat-pressing and etching. PVC/VTiC composite films with varied filler contents were prepared via solution cast. Different surface work functions of VTiC were confirmed via density functional theory (DFT) calculations. Compared with several polymer/symmetric monometallic MXene composites in our prior works, PVC/VTiC composites show simultaneously improved dielectric and breakdown properties. In later, high dielectric constant stems from cooperation of filler's asymmetry and polymer/filler interface polarization, and high breakdown strength is rooted in matrix's ultrahigh insulation. Optimized PVC/VTiC composite with 10 wt% filler possesses a high dielectric constant of ∼203, low dielectric loss of ∼0.13 at 100 Hz and high breakdown strength of ∼374 MV m −1 at direct-current field. Innovation of this work is use of asymmetric MXene filler for constructing polymer-based composite dielectrics with promising properties. This work might pave a road for large-scale preparation of advanced dielectrics for capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 15
·2261
·
IF 5.3
Zelin Li,Yang Zhao,Qinglin Deng,Xuhui Zhu,Yipeng Tan,Ziwen Feng,Hao Ji,Shan Zhang,Lingmin Yao
Using natural light energy to convert water into hydrogen is of great significance to solving energy shortages and environmental pollution. Due to the rapid recombination of photogenerated carriers after separation, the efficiency of photocatalytic hydrogen production using photocatalysts is usually very low. Here, efficient CdZnS nanoparticles@Ti3C2TxMXene nanosheet heterojunction photocatalysts have been successfully prepared by a facile in situ growth strategy. Since the CdZnS nanoparticles uniformly covered the Ti3C2TxMxene nanosheets, the agglomeration phenomenon of CdZnS nanoparticles could be effectively inhibited, accompanied by increased Schottky barrier sites and an enhanced migration rate of photogenerated carriers. The utilization efficiency of light energy can be improved by inhibiting the recombination of photogenerated electron-hole pairs. As a result, under the visible-light-driven photocatalytic experiments, this composite achieved a high hydrogen evolution rate of 47.1 mmol h−1g−1, which is much higher than pristine CdZnS and Mxene. The boosted photocatalytic performances can be attributed to the formed heterojunction of CdZnS nanoparticles and Ti3C2TxMXene nanosheets, as well as the weakened agglomeration effects.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Minying Wu,Qian Zhang,Yuanyuan Fang,Chao Deng,Fangzhou Zhou,Yi Zhang,Xingdong Wang,Yi Tang,Yajun Wang
Two-dimensional (2D) nanoreactors with cascade catalytic activity for glucose oxidation and hydrogen peroxide decomposition are prepared via immobilizing glucose oxidase (GOx) on Ti 3 C 2 MXene nanosheets. Amino-rich polypeptide, poly- l -lysine (PLL), is applied to modify the ultra-thin Ti 3 C 2 MXene nanosheets with a compatible surface for GOx immobilization. The PLL-modified Ti 3 C 2 nanosheets possess a positively charged surface and show an excellent GOx loading capacity as high as 50 wt% of the Ti 3 C 2 nanosheets. The physically adsorbed enzymes are then cross-linked with the amine groups in the PLL chains to form a robust GOx-PLL network covered on the MXene nanosheets. The GOx-conjugated Ti 3 C 2 -PLL (Ti 3 C 2 -PLL-GOx) nanosheets showed superior enzymatic activities than the activities of GOx immobilized on an inert porous silica substrate, largely because that the Ti 3 C 2 nanosheets can catalyze the decomposition of the toxic intermediate H 2 O 2 generated from the glucose oxidation. Given the excellent electrical conductivity of Ti 3 C 2 MXene, the Ti 3 C 2 -PLL-GOx nanosheets are further deposited on glassy carbon electrode to construct a high-performance biosensor with a glucose detection limit of 2.6 μM.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenlong Luo,Qianwen Liu,Baozhong Zhang,Jie Li,Ruidong Li,Tingxi Li,Zhiqiang Sun,Yong Ma
MXene nanosheets are susceptible to self-accumulation during operation, which significantly hampers their application. However, this issue can be effectively addressed through the introduction of intercalation materials. In this study, an MXene/reduced graphene oxide (rGO)/carbon nanotubes (CNTs) (MGC) film is prepared using vacuum-assisted filtration. CNTs and rGO nanosheets, as intercalation materials, play a crucial role in forming a stable interlayer structure with MXene nanosheets, resulting in an expansion of the MXene layer spacing and the creation of multi-directional stable ion transport channels. Consequently, a larger number of ion-accessible active sites are exposed. The prepared MGC film exhibits an impressive specific capacitance of 463.5F g −1 at a current density of 1 A g −1 . Furthermore, it is noteworthy that the asymmetric supercapacitor (ASC) assembled with the MGC film as the negative electrode and MnO 2 as the positive electrode demonstrates a large voltage window of 1.7 V, a high energy density of 33.95 Wh kg −1 at a power density of 814.8 W kg −1 , and an outstanding capacitance retention rate of 92.9% after 8000 cycles at 3 A g −1 . The optimization strategy for MGC electrodes not only showcases the feasibility of MXene development but also provides crucial technical support for the application of MXene in the emerging generation of portable and flexible wearable energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ubaid Khan,Yijia Luo,Ling Bing Kong,Wenxiu Que
MXenes are 2D materials dominated by carbides and nitrides , whose properties can be tailored for a wide range of applications. Here, generic method was adopted to etch MAX phases through direct redox coupling strategy between the A element and the cation of Lewis acid molten salt, allowing us to anticipate the MAX phase reactivity in molten salt. Fluorine free Ti 3 C 2 MXenes with halogen terminals, such as -Cl, -Br and -I, were synthesized using the molten salts synthesis method. Ti 3 C 2 Cl 2 , Ti 3 C 2 Br 2 and Ti 3 C 2 I 2 exhibit distinct charge-discharge rates and pseudocapacitive like behaviors in 3 M H 2 SO 4 electrolyte, with significant specific capacity of 92 C g −1 , 29 C g −1 and 63 C g −1 , respectively, corresponding to retention rates of 32%, 85.22% and 49.1%, respectively, after 10,000 cycles. The exceptional supercapacitive performances of the Ti 3 C 2 MXenes as electrodes with aqueous electrolytes are attributed to the high electrochemical activity of Cl, Br or I. This study demonstrates the efficacy of the Lewis-acidic-melt etching technique for fine tuning the surface chemistry and hence extending the applications of MXene family.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Zhaoxi Liu,Yapeng Tian,Jian Yang,Song Xu,Qingyong Tian,Pengfei Yan,Buxing Han,Qun Xu
Regulating the surface termination of a confined space to achieve ultrafast ion transport remains an ongoing challenge. Two-dimensional (2D) MXenes possess adjustable structures and interlayer spacing, which provide an ideal platform for in-depth investigation of ion transport in 2D confined space; however, the strong interaction of the negatively charged terminations in MXenes hinders the transport of intercalated cations. In this work, we proposed a strategy that precisely regulates the surface modification of Ti3C2Tx MXene with the weak polarity of boron atoms (SCB-MXene) via the distinct effect of supercritical CO2. This not only could effectively substitute −OH termination in MXene but also can prevent the loss of −O active sites, and then, both ultrafast ion transport and high volumetric capacitance can be achieved simultaneously. Ideally, a volumetric capacitance up to 742.7 C cm–3 at 1000 mV s–1 for the SCB-MXene film as pseudocapacitive materials that provides an energy density of 66.3 Wh L–1 even at an ultrahigh power density of 132.5 kW L–1 is obtained, which is a prominent record of energy density and power density reported up to now. Subsequently, it can be used in large-scale energy storage and conversion devices.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
·
界面化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Qiang Xue,Wenqiao Meng,Qing Fang,Jinyuan Zhu,Kaisong Zhang
Over the last decade, thin-film nanocomposite (TFN) membranes have been extensively utilized in desalination and wastewater treatment. The most reported nanochannels in the TFN membranes lack sufficient observational evidence. We conducted a systematic study on the TFN membrane that incorporated two-dimensional (2D) MXene nanosheets and provided evidence that nanovoids existed in the polyamide layer surrounding the nanosheets. The nanovoids functioned as nanochannels for water, which led to a significant increase in membrane permeance by 2.8 times compared to the blank membrane. The Na2SO4 rejection of the MXene polyamide membrane is as high as 96.4% and has obvious advantages in seawater desalination. The size of the nanochannels was correlated with the quantity, size, and spreadability of MXene nanosheets. Larger water nanochannels could be formed if there is a considerable amount and size of nanosheets, and they were evenly distributed. After being subjected to a sustained pressure environment, the nanochannels remained intact and the membrane maintained its excellent permeance across varying pressures. Our work could offer a perspective on the generation of internal nanochannels in the TFN membrane and optimize nanochannels to provide better desalination performance.
研究领域:
材料科学
·
环境工程
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）