ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Cuizhen Yang,Tingyao Wang,Chengcheng Li,Haiyan He,Dongming Liu,Huajie Huang
In this study, we demonstrate a facile soft chemistry strategy for the in situ growth of two-dimensional (2D) ultrathin PdMo bimetallene tightly coupled with Ti3C2Tx MXene nanosheets (PdMo/Ti3C2Tx) using a robust stereoassembly process. The 2D PdMo bimetallene offers numerous unsaturated Pd atoms and simultaneously induces combined bimetallic alloy and strain effects, while the Ti3C2Tx matrix effectively optimizes the electronic structure of PdMo bimetallene via a face-to-face interface interaction and guarantees exceptional electrical conductivity. As a consequence, the newly designed PdMo/Ti3C2Tx nanoarchitecture expresses remarkable electrocatalytic properties for the formic acid and methanol electro-oxidation, in terms of large electrochemically active surface areas, ultrahigh catalytic activity, strong antipoisoning ability, and dependable long-term stability, all of which are better than those of conventional Pd nanoparticle catalysts supported by Ti3C2Tx and carbon matrices.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Linjing Qiao,Jianqiang Bi,Yao Yang,Guandong Liang,Shaoyin Wang,Hongyi Wang
Nowadays, the increasingly severe electromagnetic (EM) wave pollution requires high-performance EM wave absorbing materials. Multi-principal-element materials are acknowledged as promising for broadening the applications owing to their tunable chemistries and structures in many fields, including as EM wave absorbers. Herein, we prepared a high-entropy MXene , (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 C 2 T x . Furthermore, multi-principal-element (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 C 2 T x /FeCoNi and (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 C 2 T x /FeCoNiCu composites were synthesized via an in-situ hydrothermal process by combining high-entropy MXene with medium-entropy magnetic alloys . In contrast with the relatively narrow effective absorption bandwidth (EAB) of (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 C 2 T x MXene (2.56 GHz), (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 C 2 T x /FeCoNi composite with 50 wt% MXene can attain an optimum EAB of 4.88 GHz with the matching thickness of only 1.73 mm. As for (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 C 2 T x /FeCoNiCu composites, both the absorption efficiency and absorption bandwidth are significantly enhanced. The combination of multi-principal-component strategy and composite construction endows the composites with synergistic dielectric and magnetic losses, optimized impedance matching as well as enhanced attenuation ability, thus improving EM wave absorption performances. In addition, radar cross section (RCS) simulation confirms that the prepared composites have broad application prospects as radar stealth materials.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xinyi Wang,Pan Xue,Shaoshuai Ma,Yanan Gong,Xinhua Xu
In nature, living organisms, such as octopuses, cabrito, and frogs, have already evolved admirable adhesive abilities for better movement and predation in response to the surroundings. Inspired by biological structures, researchers have made enormous efforts in developing actuators that can respond to external stimuli, while such adhesive property is very desired, yet there is still limited research in responsive hydrogel actuators. Here, a bilayer actuator with high stretchability and robust interface bonding is presented, which has a smart adhesion and thermoreception function. The system consists of an adhesive passive layer copolymerized of amphoteric ([2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl), SBMA) and acrylic acid (AA), and an active layer hydrogel composed of poly(N-isopropylacrylamide) (PNIPAm) containing polydopamine-modified MXene (P-MXene) and calcium chloride (CaCl2). The coordination of carboxylate and Ca2+ at the interface of the two layers enhances the interfacial bonding from 14 to 30 N m–1, which facilitates withstanding large strain and preventing stratification. The resulting hydrogel actuator can bend approximately 360° in a mere 10 s, exhibiting excellent photothermal effect, a large angle bending deformation, and ultrafast photoresponsive ability. As a proof of concept, the photothermal actuators are programmed to present various shapes and grab objects. Importantly, the hydrogel actuator exhibits remarkable adhesion capabilities toward diverse substrates, with a maximum peel force of up to 280 N m–1. Relying on their own adhesion and the photoresponse properties, these flexible adhesion actuators show outstanding gripping capability, enabling them to grip and release objects of different shapes and weights. More interestingly, the hydrogel exhibits a smart adjustable adhesion capability at different temperatures, which enables it as a gripper to recognize temperature signals through real-time different feedback actions based on its own adhesion. This study presents innovative insights into biomimetic hydrogel actuators, providing new opportunities for developing intelligent soft robots with multiple functions.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Tian-Zhu Shi,Yu-Long Feng,Tao Peng,Bao-Guo Yuan
Fe 2 O 3 is one of promising negative materials for supercapacitors (SCs), because of its low cost and high theoretical value of specific capacitance. However, the inferior conductivity and insufficient ionic diffusion rate of Fe 2 O 3 will seriously hinder the electrochemical performance of Fe 2 O 3 , resulting in limiting its practical application in SCs. Herein, a sea urchin-like 3D Fe 2 O 3 was synthesized via hydrothermal methods. And then, the 2D Ti 2 C 3 T x MXene nanosheets with high conductivity closely self-assemble on the surface of Fe 2 O 3 to provide efficient pathways for the rapid electrons transport. In addition, the sea urchin-like structure of Fe 2 O 3 can facilitate the rapid diffusion of the electrolyte to accelerate faradaic reaction. The optimized Fe 2 O 3 /MXene composite as electrode material exhibits a high specific capacitance of 486.3 F g −1 at current density of 1 A g −1 , and excellent cycling stability with 95.7% capacity retention after 5000 charge/discharge cycles. Furthermore, an asymmetric supercapacitors (ASCs) device was assembled by using Fe 2 O 3 /MXene composite as anode and MnO 2 as cathode, showing a high energy density of 32.2 Wh kg −1 at the power density of 900.6 W kg −1 , and remarkable long-term durability (95.7 % capacitance retention after 5000 cycles). This work demonstrates an effective approach of integrating the sea urchin-like Fe 2 O 3 with 2D MXene nanosheets to fabricate Fe 2 O 3 /MXene composite for high-performance SCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xianhong Zheng,Qiaole Hu,Zongqian Wang,Wenqi Nie,Peng Wang,Changlong Li
Smart wearable electronics have drawn increasing attention for their potential applications in personal thermal management, human health monitoring, portable energy conversion/storage, electronic skin and so on. However, it is still a critical challenge to fabricate the multifunctional textiles with tunable morphology and performance while performing well in flexibility, air permeability , wearing comfortability. Herein, we develop a novel roll-to-roll layer-by-layer assembly strategy to construct bark-shaped carbon nanotube (CNT)/Ti 3 C 2 T x MXene composite film on the fiber surface. The fabricated bark-shaped CNT/MXene decorated fabrics (CMFs) exhibit good flexibility, air permeability and electrical conductivity (sheet resistance, 6.6 Ω/□). In addition, the CMFs demonstrate good electrothermal performance (70.9 °C, 5 V), electromagnetic interference (EMI) shielding performance (EMI shielding effectiveness, 30.0 dB under X-Brand), and high sensitivity as the flexible piezoresistive sensors for monitoring the human motions. Importantly, our CMFs show distinctive EMI shielding mechanism, where a great proportion of incident electromagnetic microwaves are reflected by the bark-shaped CNT/MXene films owing to the multi-interface scattering effects. This work may provide a new strategy for the fabrication of multifunctional textile-based electronics and pave the way for smart wearable electronics.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Wenjing Yuan,Haitao Liu,Xihua Wang,Li Huang,Fuxing Yin,Ye Yuan
With the rapid development of wireless communication and electronic devices, current electromagnetic interference (EMI) shielding materials cannot meet the demands of smart EMI shielding in the next generation of electronic equipment. Herein, we developed an intelligent EMI shielding switch to realize microwave shielding and transmitting functions for one material simultaneously. The EMI shielding switch is composed of MXene/melamine sponge, and 3D printed resin base. The EMI shielding switch can smartly regulate its absorption-dominant EMI SE from ~0 dB to ~43.1 dB in S-band through simply operation, to fully realize microwave transmitting and shielding functions simultaneously. The EMI shielding switch provides a novel way to fabricate efficient EMI shielding materials for actual wireless communication demands.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yaping Cao,Hui Chen,Yupeng Shen,Mei Chen,Yelong Zhang,Lanying Zhang,Qian Wang,Shaojun Guo,Huai Yang
Potassium-ion batteries (KIBs) are emerging as the prospective alternatives to lithium-ion batteries in energy storage systems owing to the sufficient resources and relatively low cost of K-related materials. However, serious volume expansion and low specific capacity are found in most materials systems resulting from the large intrinsic radius of K+. Herein, SnS2 nanosheets anchored on nitrogen and sulfur co-doped MXene (SnS2 NSs/MXene) are creatively designed as advanced anode materials for KIBs. SnS2 NSs/MXene with a unique hierarchical structure can not only provide fast transmission channels for K+ but also avoid the accumulation of K+ and volume expansion. These novel features make SnS2 NSs/MXene electrodes exhibit a superior reversible specific capacity of 342.4 mA h g–1 under 50 mA g–1. Also, they maintain 206.1 mA h g–1 at an even higher current density of 0.5 A g–1 over 800 cycles almost without capacity decay. Moreover, the multistep alloying reaction mechanism of SnS2 NSs/MXene composites and K+ is revealed by the ex situ X-ray diffraction measurement. In addition, the density functional theory calculations confirm the existence of Ti–S bonds between SnS2 nanosheets and MXene, which significantly enhance the structural stability and cycling electrochemical performance of SnS2 NSs/MXene composites.
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Micromachines
·
2021
·Vol. 12
·期 3
·252
·
IF 2.891
Feiyu Fang,Han Wang,Huaquan Wang,Xiaofei Gu,Jun Zeng,Zixu Wang,Xindu Chen,Xin Chen,Meiyun Chen
In this work, a novel flexible electrically resistive-type MXene/Thermoplastic polyurethanes(TPU) based strain sensors was developed by a composite process of electrospinning (ES) and electrostatic spray deposition (ESD). Compared with other deposition processes, the sensing layer prepared by ESD has better adhesion to the ES TPU nanofiber membrane and is not easy to crack during the stretching process, thereby greatly improving the working range of the strain sensor. Furthermore, we obtained the sandwich structure easily by ES on the surface of the sensing layer again. This will help make the stress distribution more uniform during the stretching process and further increase the strain sensing range. The ESD-ES strain sensors were attached on skin to monitor various human motions. The results demonstrate that our ESD-ES strain sensors have wide application prospects in smart wearable device.Keywords:strain sensor;electrospinning;electrostatic spray deposition;MXene
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yanting Wang,Ting-Ting Li,Bing-Chiuan Shiu,Xuefei Zhang,Hao-Kai Peng,Ching-Wen Lou,Jia-Horng Lin
With the increase of electromagnetic radiation pollution, there is an urgent need to develop lightweight, ultra-thin, and high electromagnetic shielding composite film to eliminate unwanted electromagnetic interference. Herein, based on the layer-by-layer assembly strategy, a simple solution dip coating method was used to achieve the combination of two-dimensional transition metal (MXene) and nanofiber film, thereby constructing a conductive composite film with a unique undulating structure. The silicon-containing hydrophobic layer imparted excellent hydrophobic properties to the composite film while maintained the stability of the sandwich structure. The contact angle (CA) of the composite film with ultra-thin thickness (29um) was 125.49° and the conductivity was as high as 71.91 S/cm. The hydrophobic treatment would not damage the flexibility and mechanical properties of the composite film. In particular, the average shielding effectiveness (SE) and SSE/t could as high as 28.82 dB and 12422.41 dB cm 2 g −1 , due to the layered structure formed by the connection of countless MXene nanosheets is beneficial to promote multiple absorption and reflection. This layer-by-layer assembly strategy provides a facile route in fabricating light-weight, flexible and ultrathin composite film for high-performance electromagnetic shielding, which is of great significance for broadening the practical application of MXene-based conductive materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Ke Wang,Xianhe Li,Nan Wang,Quanhao Shen,Maochang Liu,Jiancheng Zhou,Naixu Li
Solar photocatalysis has long relied on the rational design of semiconductor photocatalysts. Herein, a ternary meso-TiO2@ZnIn2S4/Ti3C2 MXene photocatalyst is prepared and demonstrated with a core–shell structure accompanied by few-layered Ti3C2 Mxene on the ZnIn2S4 shell. The success of the synthesis depends on a two-step method consisting of hydrothermal and electrostatic self-assembly procedures. The ternary heterojunction exhibits a good behavior for photocatalytic CO2 reduction. A mechanism study of the photocatalytic reaction indicates that the photogenerated charges transfer in a Z-scheme pathway. Moreover, the construction of the Schottky junction between metallic Ti3C2 and TiO2@ZnIn2S4 is extremely effective for the reduction reaction. Consequently, the photocatalytic rates toward CO and CH4 production are up to 30.5 and 34.0 μmol/g within 3 h of illumination by simulated sunlight, respectively, while the CH4 selectivity reaches 52.7%. This work provides a good strategy to achieve highly efficient photocatalytic CO2 reduction.
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Analytical Methods
·
2021
·Vol. 13
·期 22
·2512-2518
·
IF 2.896
Fenghui Zhu,Xiuyun Wang,Xiaowen Yang,Chenfei Zhao,Yue Zhang,Siqi Qu,Shuo Wu,Wei Ji
Sensitive detection of H2O2 in the nano- to micromolar range is critical for health monitoring and disease diagnosis. Two-dimensional transition metal carbides or/and nitrides (called MXenes, MXs) have excellent potential applications in the electrochemical field due to their outstanding electrical conductivity and catalytic properties. In this work, Ti3C2Tx (MX) was employed for the construction of a sensitive and enzyme-free electrochemical sensing interface for the detection of hydrogen peroxide (H2O2) through a simple and effective method. Prussian blue (PB) was electrochemically deposited on the surface of a glassy carbon electrode (GCE). Chitosan (CS) and MX were sequentially dripped onto the PB modified GCE surface. The reasonable fabrication of the MX/CS/PB/GCE sensing interface presented good electrochemical sensing performance towards H2O2 with a low limit of detection (4 nM), a wide linear range from 50 nM to 667 μM and good selectivity. The proposed MX/CS/PB/GCE has been proven to monitor H2O2 in food samples and biological samples with recoveries between 94.7% and 100.3%. This work has made a beneficial attempt and research for exploring and expanding the application of MXs in the field of electrochemical sensing.
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Polymers
·
2021
·Vol. 13
·期 11
·1820
·
IF 4.329
Lu Liu,Guobing Ying,Yinlong Zhao,Yuexia Li,Yiran Wu,Dong Wen,Meng Wu,Minghui Wang,Qingzhong Zhou,Xiang Wang,Cheng Wang
As a member of two-dimensional (2D) materials, MXene is an ideal reinforcement phase for modified polymers due to its large number of polar functional groups on the surface. However, it is still relatively difficult to modify any functional groups on the surface of MXene at present, which limits its application in enhancing some polymers. Herein, one-dimensional (1D) attapulgite (ATP) nanomaterials were introduced onto the surface of MXene to form ATP–MXene hybrids, which successfully improved the mechanical properties of the epoxy composites. ATP with appropriate content can increase the surface roughness of the MXene lamellae to obtain better interface interaction. Therefore, remarkable enhancement on the mechanical property was achieved by adding M02A025 (0.2 wt % MXene and 0.25 wt % ATP), which is the optimum composition in the hybrids for composite mechanical properties. Compared to neat epoxy, the tensile strength, flexural strength and critical stress intensity factor (KIC) of M02A025/epoxy are increased by 88%, 57%, and 195%, respectively, showing a high application prospect.Keywords:MXene Ti3C2Tx;attapulgite;hybrids;epoxy-matrix composites;mechanical properties
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