ENERGY
·
2020
·
IF 6.082
Fan Zhang,Zirui Jia,Chao Wang,Ailing Feng,Kuikui Wang,Tianqi Hou,Jiajia Liu,Yi Zhang,Guanglei Wu
Silicon has been regarded as a promising anode materials for lithium ion battery . However, large volume change during lithiation/delithiation process impedes its application for energy storage. Two-dimensional titanium carbide or carbonitride nanosheet , known as MXene , possesses layered-stacked structure and high electrical conductivity . So MXene has a great potential to improve the cycle life of silicon anode because its layered-stacked structure can accommodate the volume expansion of silicon. Herein, we present a facile process to prepare sandwich-like silicon/Ti 3 C 2 T x MXene composite directed by electrostatic self-assembly. This unique architecture could accommodate silicon expansion during lithiation and enhance electronical conductivity. The silicon/Ti 3 C 2 T x MXene composite delivers an initial reversible capacity of 1067.6 mAh g −1 at a current of 300 mA g −1 . Moreover, it shows a steady cycling ability of 643.8 mAh g −1 at 300 mA g −1 after 100 cycles. This work may shed lights on the development of high energy density silicon-based anode materials for lithium ion battery.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Yan-Jun Wan,Xing-Miao Li,Peng-Li Zhu,Rong Sun,Ching-Ping Wong,Wei-Hsin Liao
How to obtain high strength while remain the good shielding performance of MXene film is a big challenge, which limits its further application. Herein, we report on fabrication of mechanically strong and high-performance EMI shielding Ti 3 C 2 T x composite film by incorporating of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) and then treatment with concentrated sulfuric acid to remove the insulating PSS. By introducing of 30 wt% PEDOT:PSS into Ti 3 C 2 T x film and with acid post-treatment, the EMI SE of composite film with thickness of ~6.6 μm is up to 40.5 dB while the tensile strength is 38.5 ± 2.9 MPa and the increment in tensile strength is as high as 155% when compared to that of Ti 3 C 2 T x film. It achieves a good balance between shielding performance and mechanical property, which has not been achieved in reported literatures. The combination of mechanical and shielding performances portfolio outperforms the counterpart of other polymer composites filled with MXene.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yitong Guo,Sen Jin,Libo Wang,Pingge He,Qianku Hu,Li-Zhen Fan,Aiguo Zhou
In this study, highly pure Mo 2 CT x MXene was successfully synthesized from Mo 2 Ga 2 C by etching in hydrothermal conditions for 24 h at 140–180°C. The etching solutions were lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF) or ammonium fluoride (NH 4 F) mixed with hydrochloric acid (HCl). The temperature to obtain pure Mo 2 CT x MXene in NH 4 F + HCl solution was 140°C, lower than that in other etching solutions. The thickness of as-prepared monolayer Mo 2 CT x nanosheet was measured to be 1.5 ± 0.3 nm by atomic force microscope. From thermogravimetry and differential thermal analysis, Mo 2 CT x MXene was found to be stable in argon atmosphere at a temperature of up to 500°C. As the temperature increased, Mo 2 CT x MXene gradually transformed, and β-Mo 2 C/MoC/Mo 3 C 2 was eventually formed to coexist with Mo 2 CT x MXene at 700°C. In air atmosphere, Mo 2 CT x MXene was stable at 200°C. At 590°C, Mo 2 CT x MXene was completely oxidized to MoO 3 .
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VACUUM
·
2020
·
IF 2.906
Kehua Han,Ximing Zhang,Peng Deng,Qingjie Jiao,Enyi Chu
In this study, we reported that two-dimensional titanium carbide (Ti 3 C 2 ) MXene has intrinsic catalytic activity for thermal decomposition of high-energy ammonium perchlorate-based molecule perovskite (H 2 dabco)[NH 4 (ClO 4 ) 3 ] (DAP-4). The micro morphology and structure of Ti 3 C 2 MXene were characterized. Thermal catalysis decomposition of DAP-4 using Ti 3 C 2 as a novel catalyst was investigated by Differential scanning calorimetry (DSC). The results showed that with 10 wt% Ti 3 C 2 added, the decomposition temperature of DAP-4 was reduced to 341.2 °C at the heating rate of 10 °C·min −1 , which decreased by 43.8 °C from raw DAP-4 (385 °C). The activation energy of DAP-4 thermal decomposition effectively reduced from 181 kJ mol −1 to 155 kJ mol −1 . A possible mechanism of Ti 3 C 2 MXene for the catalysis thermal decomposition of DAP-4 was proposed. This work provides a proof-of-principle concept for the thermal catalysis decomposition of ammonium perchlorate-based molecule perovskite energetic materials using the titanium carbide MXene as a catalyst.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Na Zhao,Yang Hu,Jinlong Du,Gang Liu,Bowei Dong,Yuying Yang,Jing Peng,Jiuqiang Li,Maolin Zhai
Developing non-noble-metal cocatalysts is essential for the large-scale implementation of solar-driven H 2 production technology, but still remains a great challenge. In this work, Ti 3 C 2 T x MXene coupled CdS nanostructures are fabricated via one-step gamma-ray radiation-induced reduction in ambient conditions. By subsequent alkaline treatment, a novel cocatalyst of carbon supported amorphous TiO 2 nanosheets (denoted as aTiO 2 -C) is derived from Ti 3 C 2 T x /CdS to form aTiO 2 -C/CdS nanocomposites. The prepared aTiO 2 -C/CdS nanocomposites with cyclability achieve a H 2 evolution rate of 1.48 mmol·g −1 ·h −1 under visible-light illumination, which is 6.4 and 7.0 times greater than that of pristine Ti 3 C 2 T x /CdS and P-CdS, respectively. The oxygen vacancies in aTiO 2 -C cocatalysts are revealed to act as electron trapping sites to facilitate the transfer of photoexcited electrons and boost photoactivity. Further, the electronic interaction between CdS and aTiO 2 -C prevents Cd 2+ from leaching and thus enhances photostability. The results of this work may guide the rational design of viable cost-effective cocatalysts in solar-to-chemical energy conversion and beyond.
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Advanced Materials Interfaces
·
2020
·Vol. 7
·期 19
·2000831
·
IF 4.948
Zhilin Zhao,Xinming Wu
Multifarious layered electrode materials are attracting increased attention in the field of energy storage because of their high specific surface and interlayer modifiability. However, the natural tendency to be re-superimposed and the inherent disadvantages of a single layered electrode significantly affect electronic transport and ion migration. Considering the poor electrochemical performance and low structural stability, a novel MXene@PDDA/NiAl-LDHs hybrids as supercapacitor electrode via an electrostatic-assembled approach is elaborately designed. The alternate MXene and PDDA/NiAl-LDHs layers with 3D interconnected networks architectures could ensure intimate contact to efficiently take advantage of high electron conductivity of MXene and high pseudocapacitance activity of PDDA/NiAl-LDHs, thus effectively accelerating the ionic/electronic transport rates and improving the electrochemical storage of hybrid electrodes. As a consequence, as an electrode for supercapacitor, the MXene@PDDA/NiAl-LDHs exhibits a high specific capacitance of 1825.8 F g −1 at a current density of 1.0 A g −1 , a remarkable synergetic effect, leading to a high rate capability after 100 cycles at different current densities and long cycling stability with only 0.9% degradation after 5000 cycles at 5.0 A g −1 . This work provides a strategy for 2D layered materials to design electrodes with excellent electrochemical performance in the field of energy storage.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Krishnamoorthy Rajavel,Suibin Luo,Yanjun Wan,Xuecheng Yu,Yougen Hu,Pengli Zhu,Rong Sun,Chingping Wong
The present study deals with novel, and cost-effective preparation of 2D MXene (Ti 3 C 2 T x ) filled polyvinylidene fluoride (PVDF) polymer nanocomposite for the attenuation of electromagnetic interference (EMI). The obtained nanocomposite showed remarkable shielding effectiveness ( SE ) of 48.47 ± 3.5 dB for 22.55 vol% filler contents at a thickness of 2 mm. Formation of conducting network along with the assembly of micro capacitor network preserved for its high EMI shielding performance. The absorption dominated EMI shielding mechanism explained by the strong resonance, and interfacial polarization favors the loss of incident EM energy confirmed from dielectric measurements. Besides, the enhanced thermal conductivity of MXene-PVDF nanocomposites about 0.767 ± 0.034 Wm −1 K −1 at 22.55 vol% filler content depicts that a large amount of incident EM wave attenuated majorly by dielectric components which would be dissipated as heat quickly. The fabricated MXene-PVDF nanocomposites could be a potential candidate for EMI shielding materials and promising multifaceted electronic utilization.
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RSC Advances
·
2019
·Vol. 9
·期 70
·41038-41049
·
IF 3.049
Yang Wang,Jian Yang,Zhaofeng Chen,Yunlong Hu
A new ultralight carbon foam/Ti3C2TX (CF/MXene) electromagnetic (EM) absorbing hybrid with three-dimensional network structure was fabricated by vacuum impregnation and freeze-drying process. These hybrids display excellent flexibility and steady compression-resilience properties and also the special three-dimensional structure with ultralow density of only 5–7 mg cm−3 shows higher EM absorption than most foam-based EM absorbers. Studies have shown that the minimum reflection loss of CF/MXene-N2 reaches −45 dB at 8.8 GHz with the Ti3C2TX nanosheets content of 9.8%. In the meanwhile, the effective absorption bandwidth of CF/MXene-N2 can also reach up to 5 GHz (from 6.9 GHz to 11.9 GHz) with the thickness of 4.5 mm. Moreover, the fundamental EM absorption mechanism of CF/MXene hybrids involved to impedance matching, conductive loss and polarization loss is carefully analyzed. Thus, it is expected that the new ultralight carbon foam/Ti3C2TX hybrids with three-dimensional network structure will have great application prospects in the fields of EM absorption.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 5
·2210063
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IF 19.924
Ruijia Zhang,Zengqi Huang,Weipeng Chen,Benzheng Lyu,Hong Zhang,Xinjun He,Xiaotian Hu,Yanlin Song,Wallace C. H. Choy
Advancing hole transport layers (HTL) to realize large-area, flexible, and high-performance perovskite solar cells (PSCs) is one of the most challenging issues for its commercialization. Here, a self-assembled gradient Ti 3 C 2 T x MXene incorporated PEDOT:PSS HTL is demonstrated to achieve high-performance large-area PSCs by establishing half-caramelization-based glucose-induced MXene redistribution. Through this process, the Ti 3 C 2 T x MXene nanosheets are spontaneously dispersed and redistributed at the top region of HTL to form the unique gradient distribution structure composed of MXene:Glucose:PEDOT:PSS (MG-PEDOT). These results show that the MG-PEDOT HTL not only offers favorable energy level alignment and efficient charge extraction, but also improves the film quality of perovskite layer featuring enlarged grain size, lower trap density, and longer carrier lifetime. Consequently, the power conversion efficiency (PCE) of the flexible device based on MG-PEDOT HTL is increased by 36% compared to that of pristine PEDOT:PSS HTL. Meanwhile, the flexible perovskite solar minimodule (15 cm 2 area) using MG-PEDOT HTL achieve a PCE of 17.06%. The encapsulated modules show remarkable long-term storage stability at 85 °C in ambient air (≈90% efficiency retention after 1200 h) and enhanced operational lifetime (≈90% efficiency retention after 200 h). This new approach shows a promising future of the self-assembled HTLs for developing optoelectronic devices.
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CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Ke Wang,Miao Cheng,Nan Wang,Qianyi Zhang,Yi Liu,Junwei Liang,Jie Guan,Maochang Liu,Jiancheng Zhou,Naixu Li
Ascribing to incremental fossil fuels emissions, the utilization and conversion of CO 2 and development of renewable energy is globally essential and significative. Ultrathin 2D/2D heterojunctions with fast photo-generated electrons transmission channels illustrate a better strategy to improve photocatalytic activity. Herein, combing La 2 Ti 2 O 7 with metallic few-layered Ti 3 C 2 MXene to construct inter-plane 2D/2D heterojunction was in situ self-assembled through solvothermal method. Benefiting from the advantages including stability, conductivity, abundant active sites and formation of Schottky junctions, as expected, the ultrathin 2D/2D La 2 Ti 2 O 7 /Ti 3 C 2 MXene nanosheets presented much improved photocatalytic ability for CO 2 reduction to CO and CH 4 , which is about 4.6 and 11.4 times higher than that of mechanical mixed La 2 Ti 2 O 7 and Ti 3 C 2 MXene. fs-TAS and XPS provided direct evidence that the prominence of La 2 Ti 2 O 7 /Ti 3 C 2 MXene in photocatalytic CO 2 reduction reaction over other opponents should be attributed to the synergetic effect of efficient charge carrier mobility and formed 2D/2D Schottky heterojunction interfacial contact between La 2 Ti 2 O 7 and Ti 3 C 2 MXene. Intermediates revealed by in-situ DRIFTS and corresponding atomic-level DFT calculations confirmed the mechanism, pathways and selectivity for photocatalytic CO 2 conversion. This work expanded promising prospects arouses new impetus for deepening the prehension of the mechanism of photocatalytic CO 2 reduction, designing and fabrication of Schottky heterojunctions for application in conversion and utilization of CO 2 .
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Suzhou Xu,Can Liu,Xuping Jiang,Xinyu Wang,Shijin Zhang,Yanting Zhang,Qingguo Wang,Weiling Xiong,Jing Zhang
The performance and mechanisms of a titanium carbide (Ti 3 C 2 ) MXene modified Fe 3+ /hydrogen peroxide (H 2 O 2 ) system were compared in detail under dark and visible light conditions, with a new mechanism proposed for the reaction and reduction of MXene by Fe 3+ . Using Bisphenol A (BPA) as the target pollutant, the degradation of BPA by the Fe 3+ /H 2 O 2 system was improved after adding MXene in the dark, and the degradation rate of BPA was ≥ 95 % within 12.5 min under visible light, six times higher than that in the dark. Fe 2+ was ascertained to be the effective component responsible for H 2 O 2 activation to produce ·OH. SEM , XPS, ICP, XRD, and FTIR spectroscopy , analyses show that MXene and Fe 3+ form a complex, and then MXene reacts with Fe 3+ by breaking the Ti–C bonding to accelerate the Fe 3+ /Fe 2+ cycle. MXene uses photogenerated electrons to promote this reaction under visible light. In addition, quenching experiments and electron spin resonance spectroscopy results show that ·OH and O 2 •− are the main reactive oxygen species under visible light, while ·OH is the main active species in the dark. MXene thus effectively uses O 2 to form O 2 •− under visible light and promotes the Fe 3+ /Fe 2+ cycle. This study provides a theoretical basis for the combination of visible light catalysis and the advanced oxidation process of a Ti 3 C 2 MXene.
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ACS Nano
·
2022
·
IF 18.027
Dekui Song,Guo Ye,Yan Zhao,Yan Zhang,Xincun Hou,Nan Liu
Muscle fatigue is a common symptom experienced by many people and associated with less maximal force production of fatigued muscle. It is highly desirable to simultaneously and imperceivably diagnose muscle fatigue and restore muscle function using one skin electrode, yet no such electrode has been developed so far. Herein, we report an all-in-one, bioderived, air-permeable, and sweat-stable MXene electrode that can concurrently and comfortably record electromyographic (EMG) signals and achieve electrostimulation and electrothermal therapy for muscle theranostics. Leveraging the structural arrangement of perennial herbs and ion cross-linking of MXene in sweat, MXene-based electrodes (MBE) exhibit high breathability, are ultralightweight (∼0.25 mg/cm3), and have low and stable electrode–skin interfacial impedance at a variety of environments, facilitating the long-term reliable monitoring of electrophysiology. Taken together with electrostimulation and electrothermal therapy at the skin surface, MBE can diagnose muscle fatigue and restore muscle function by stimulating blood circulation. In addition, it can also be used for muscle rehabilitation training and prosthesis control via human–computer interaction. Our all-in-one, bioderived, air-permeable, and sweat-stable MXene electrode has a great potential for daily wearable healthcare of muscle fatigue.
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