INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Long Chen,Junmei Liang,Qicheng Zhang,Xuewen Hu,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Developing advanced noble-metal-free electrocatalysts for the hydrogen evolution reaction (HER) is still a great challenge. Herein, a novel HER catalyst with quasi zero-dimensional (0D) MoS 2 quantum dots (QDs) supported on two-dimensional (2D) Ti 3 C 2 T x MXene nanosheets is facilely synthesized. The MoS 2 QDs/Ti 3 C 2 T x nanohybrid retains the unique layer structure, and the MoS 2 QDs are in situ formed and distributed uniformly. The obtained MoS 2 QDs/Ti 3 C 2 T x catalyst exhibits superior electrocatalytic activity due to its excellent conductivity, abundant of active sites exposed and a high percentage of 1T metallic phase (∼76%) of MoS 2 QDs. Remarkably, an early HER overpotential of 220 mV at 10 mA cm −2 and a small Tafel slope of 72 mV dec −1 of MoS 2 QDs/Ti 3 C 2 T x are achieved in 0.5 M H 2 SO 4 solution. In addition, the exchange current density of MoS 2 QDs/Ti 3 C 2 T x is ∼5 times larger compared with pure MoS 2 , thus demonstrating an accelerated charge transfer during the electrocatalytic process.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yawen Yang,Jinyu Zhu,Kaiming Hou,Limin Ma,Zhangpeng Li,Weihong Jia,Honggang Wang,Jinqing Wang,Shengrong Yang
In this work, a surprisingly simple and versatile strategy was developed to construct organic/inorganic bi-layer coating, and excellent lubricating properties and long service life are achieved simultaneously. The PTFE/Al 3+ -MXene coating was fabricated by a two-step strategy including self-assembly of Al 3+ -induced MXene coatings and in-situ transfer of PTFE under the induction of friction force and heat, which are designed to promote the molecular interaction and mechanical properties of composite coating, respectively. The ratio of Al 3+ /MXene concentration and pre-friction time against PTFE ball were regulated and optimized. It was found that the interaction exists between the transferred PTFE layer and MXene layer. Molecular dynamics simulations confirmed that the PTFE molecular chains could be anchored at the oxidation site of MXene sheets through friction-induced molecular welding, slowing MXene’s oxidation diffusion from the edge to the surface. The research results show that PTFE/Al 3+ -MXene coating after 1.0 h of pre-friction time presents the best service life among the prepared coatings, approximately 9 times longer than the PTFE transfer layer-1.0 h, and also much better than the Al 3+ -MXene 10 raw coating without transferring PTFE. It was further found that the obtained PTFE/Al 3+ -MXene/T-1.0 composite coating facilitates the easy formation of secondary transfer film on the upper counterpart, which is critical in extending the wear-resisting life of PTFE/Al 3+ -MXene/T-1.0 bi-layer coating.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Guangyong Zeng,Yongcong Liu,Qingquan Lin,Shengyan Pu,Size Zheng,Micah Belle Marie Yap Ang,Yu-Hsuan Chiao
Industrial development resulted to an increase in discharge of hazardous oily wastewater with multi-component, which gravely threatens human health and the ecosystem. This is a huge challenge ushered in membrane technology. Recently, two-dimensional material, MXene has been demonstrated as a potential candidate for the construction of functional membranes. A novel TA-ZIF-8@MXene metal–organic framework (MOF) composite membrane has been fabricated and exploited for oily wastewater treatment. The composite membrane (T-M4) exhibited an excellent water flux (5347.36 L·m −2 ·h −1 ) after the incorporation of ZIF-8 modified by tannic acid (TA) nanoparticles. Moreover, the MOF-MXene composite membrane possessed an excellent chemical stability and high oil/water emulsion separation performance. The experimental results showed that the rejection ratios of T-M4 composite membrane for three different oil/water emulsions reached more than 98%. Furthermore, the chemically stable TA-ZIF-8@MXene/CA composite membrane showed an excellent performance having more than 84% flux recovery ratio (FRR) during multi-cycle oil/water emulsion filtration with neutral, acidic, alkaline, and salty media. In addition, molecular dynamics simulations were used to reveal the separation mechanism of the composite membrane. The investigation successfully applied MXene membrane materials to micron-level separation, which provided the reference for the application of MXene in O/W separation.
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Jie Wang,Xiaoyan Ma,Jiale Zhou,Fanglin Du,Chao Teng
High-strength, flexible, and multifunctional characteristics are highly desirable for electromagnetic interference (EMI) shielding materials in the field of electric devices. In this work, inspired by natural nacre, we fabricated large-scale, layered MXene/amarid nanofiber (ANF) nanocomposite papers by blade-coating process plus sol–gel conversion step. The as-synthesized papers possess excellent mechanical performance, that is, exceptional tensile strength (198.80 ± 5.35 MPa), large strain (15.30 ± 1.01%), and good flexibility (folded into various models without fracture), which are ascribed to synergetic interactions of the interconnected three-dimensional network frame and hydrogen bonds between MXene and ANF. More importantly, the papers with extensive continuous conductive paths formed by MXene nanosheets present a high EMI shielding effectiveness of 13188.2 dB cm2 g–1 in the frequency range of 8.2–12.4 GHz. More interestingly, the papers show excellent Joule heating performance with a fast thermal response (<10 s) and a low driving voltage (≤4 V). As such, the large-scale MXene/ANF papers are considered as promising alternatives in a wide range of applications in electromagnetic shielding and thermal management.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 24
·期 9
·2200098
·
IF 4.122
Qiguo Chen,Kai Zhang,Li Huang,Yibin Li,Ye Yuan
The electromagnetic interference (EMI) shielding performance of reduced graphene oxide (rGO) foam is restricted to its poor conductivity and macro-monotonic structure. In this work, highly conductive MXene nanosheets are introduced into graphene oxide (GO) solution and multilayer structures were designed to improve the EMI shielding performance of graphene foam. The multilayer rGO/MXene composite foam shows an excellent EMI shielding effectiveness of more than ≈28 dB in C and ≈35 dB in X band. Meanwhile, it reveals an outstanding heat insulation performance equaling to air (0.025 W m −1 K). The macro multilayer and microporous structure plays a prominent role in the EMI shielding and heat insulation performance. This work provides valuable ideas for designing multifunctional EMI shielding materials for the next generation of smart electronic devices.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Hongwei Wang,Fang Wu,Zhiheng Wang,Yang Wang,Shufang Zhang,Haijun Luo,Zhiqin Zheng,Liang Fang
Chromium (VI) removal is crucial to the safety of water resources, but there is still a lack of effective and fast dislodge methods, especially the on-site rapid remediation and emergency removal technology . Herein, the monolayer (ML) Ti 3 C 2 T x nanosheets (NSs) were prepared to remove Cr (VI) from water. The solution sample of the two-dimensional (2D) Ti 3 C 2 T x NSs demonstrate ultrafast adsorption kinetics (the concentration decreasing from 300 to 3 mg L −1 in 10 min) and impressively high capacity (1483 mg g −1 ), which is several times higher than that of the most reported Cr (VI) adsorption by Ti 3 C 2 T x . The analysis of the adsorption kinetics and isotherm models indicates that the adsorption reaction is endothermic, with physical and chemical adsorption coexisting (mainly monolayer chemical adsorption). The joint study of the experimental analysis and theoretical calculation based on the density functional theory (DFT) demonstrates that the extraordinary removal performance of Cr (VI) is due to the synergetic effect of reduction reaction removal and electrostatic adsorption. It is found that the Cr (VI) is mainly reduced by the OH- terminals on Ti 3 C 2 , and the detoxified Cr (III) is anchored on the surface of Ti 3 C 2 T x through complexation reaction with O terminal. The advantages of ultrafast adsorption kinetics and extra-high adsorption capacity of the single-layered Ti 3 C 2 T x for Cr (VI) removal make it a remarkable candidate for rapid and urgent removal of Cr (VI) wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 12
·2200158
·
IF 8.856
Weijia Liu,La Li,Chuqiao Hu,Di Chen,Guozhen Shen
The delamination of 2D Ti 3 C 2 T x MXene endows the injection of various ions and small organic molecules into its layers, thus leading to a tunable distance between layers and adjustable electrochemical properties. A suitable selection of intercalators needs to be considered according to the relevant metal-ion-based energy storage device because of the different radii of metal ions such as Li + , Na + , Mg 2+ Zn 2+ , etc. Herein, the intercalation of N , N -dimethylacetamide (DMAC), acetonitrile (ACN), dimethyl sulfoxide (DMSO), LiCl (H 2 O) into Ti 3 C 2 T x cathodes and their electrochemical performance comparisons by fabricating Zn-ion microsupercapacitors (MSCs) is reported. Studies found that an increased calculated interlayer space of 3.42, 7.47, 7.79, 8.3 Å is obtained for the H 2 O, DMSO, ACN, DMAC intercalated Ti 3 C 2 T x cathodes, and a decreased calculated binding energy of −0.03, −0.78, −1.91, and −3.06 eV is obtained for the Ti 3 C 2 T x -H 2 O, Ti 3 C 2 T x -DMSO, Ti 3 C 2 T x -ACN, and Ti 3 C 2 T x -DMAC, respectively. The highest interlayer space, lowest binding energy, and amide groups make the DMAC intercalated Ti 3 C 2 T x - based MSC exhibit volumetric capacitance of 1873 F cm −3 at a scan rate of 5 mV s −1 , much higher than 1103 F cm −3 for Ti 3 C 2 T x -H 2 O, 1313 F cm −3 for Ti 3 C 2 T x -ACN, 544 F cm −3 for Ti 3 C 2 T x -DMSO. The superior flexibility that results in invariable capacitance under 5000 bending cycles, together with the lighting test of the fabricated MSC, demonstrates its application in the wearable integrated system.
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2022
·
IF 5.395
Tianhui Du,Shanshan Zhao,Wenying Dong,Wendi Ma,Xingyu Zhou,Yilong Wang,Mei Zhang
Ideal bone implant materials need to provide multiple functions such as biocompatibility, non-cytotoxicity, and bone tissue regeneration guidance. To tackle this challenge, according to our previous work, carbon fiber (40 mm)-reinforced polyetheretherketone (CFPEEK) composites were developed by using 3D needle-punched CFPEEK preform molding technology. Because of the excellent mechanical properties, the CFPEEK needled felt matrix composites have a broad application prospect in orthopedic internal fixation and implant materials. In order to expand the application range of composite materials, it is very necessary to improve the surface bioactivity of composite materials. The surface modification of CFPEEK with 2D titanium carbide (MXene) nanosheets (sulfonated CFPEEK (SCFPEEK)-polydopamine (PDA)-Ti3C2Tx) for enhanced photothermal antibacterial activity and osteogenicity was explored in this study. Here, the new composites we constructed are composed of Ti3C2Tx nanosheets, PDA, and biologically inert SCFPEEK, which gave the bio-inert composites bimodal therapeutic features: photothermal antibacterial activity and in vivo osseointegration. To our knowledge, this is the first time that a CFPEEK implant with a bioactive surface modified by Ti3C2Tx nanosheets was demonstrated. Due to the synergistic photothermal therapy (PTT) treatment of Ti3C2Tx/PDA, SCFPEEK-PDA-Ti3C2Tx (SCP-PDA-Ti) absorbed heat and the temperature increased to 40.8–59.6 °C─the high temperature led to bacterial apoptosis. The SCP-PDA-Ti materials could effectively kill bacteria after 10 min of near-infrared (NIR) irradiation at 808 nm. SCP-PDA-Ti (2.5) and SCP-PDA-Ti (3.0) achieved a 100% bacteriostasis rate. More importantly, the multifunctional implant SCP-PDA-Ti shows good cytocompatibility and an excellent ability to promote bone formation in terms of cytotoxicity, diffusion, alkaline phosphatase activity, alizarin red activity, real-time polymerase chain reaction analysis, and in vivo bone defect osteogenesis experiments. This provides a more extendable development idea for the application of carbon fiber-reinforced composites as orthopedic implants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS
·
2022
·
IF 2.552
Ying Lv,Kai Wang,Dongyang Li,Ping Li,Xuelian Chen,Weiwei Han
MXene has gradually become hot photocatalyst in recent years due to its unique properties. This work successfully synthesized rare Ag-doped partial etched Ti 3 C 2 T x /Ti 3 AlC 2 composite nanosheets via a reduction process. The obtained ternary Ti 3 C 2 T x /Ti 3 AlC 2 @Ag can be deemed a promising photocatalyst in photodegradation fields. Ti 3 C 2 T x /Ti 3 AlC 2 @Ag-50 exhibited excellent catalytic degradation performance towards methylene blue (MB), Rhodamine B (RhB) and methylene orange (MO), with the obtained degradation efficiency of 99.7%, 98.9% and 99.3%, respectively. Furthermore, there is a synergistic effect between Ag nanoparticles and partial etched Ti 3 C 2 T x /Ti 3 AlC 2 nanosheets, as demonstrated by the transfer of photogenerated carriers and the generation of reactive oxygen species, which can improve the catalytic degradation performance of the three organic dye molecules.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Rong Luo,Zhenyu Li,Ruixiang Li,Chunli Jiang,Ruijuan Qi,Mengqin Liu,Hechun Lin,Rong Huang,Chunhua Luo,Hui Peng
It is meaningful to search high-efficient and inexpensive electrocatalysts for hydrogen evolution reaction (HER) due to the energy crisis and environmental pollution. Here, we report the preparation of ultrafine Ru nanoparticles from a hybrid of ZIF-L(Co) MOF and polydopamine coated few-layered Ti 3 C 2 T x MXene (FL-Ti 3 C 2 T x ). FL-Ti 3 C 2 T x is used as a template to grow regular leaf-shaped ZIF-L(Co) nanosheets through the reaction of Co ions anchored on the MXene surface with 2-methylimidazole. The obtained hybrid is then doped with Ru ions through ion exchange between Ru and Co ions, followed by thermal annealing at a temperature of 350 °C in an Ar atmosphere to produce ultrafine Ru nanoparticles. The obtained Ru@ZIF-L(Co)/FL-Ti 3 C 2 T x nanocomposite shows outstanding HER performance with a low overpotential of 16.2 mV at a current density of 10 mA cm −2 , a small Tafel slope of 21.0 mV dec −1 and excellent stability in 1.0 M KOH solution. This work provides a new strategy for the design and synthesis of highly efficient HER catalyst via MOFs with tunable composition and structure.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Fudong Zhang,Penggang Ren,Zhengzheng Guo,Jin Wang,Zhengyan Chen,Ze Zong,Jie Hu,Yanling Jin,Fang Ren
Flexible, lightweight, robust and versatile properties are essential for the next generation of wearable as well as intelligent electromagnetic interference (EMI) shielding materials. In this work, multilayered films containing cellulose nanofiber (CNF) layers, CNF/MXene layers, and CNF/silver nanowires (CNF/AgNWs) layers were fabricated by an efficient and easy-to-use vacuum filtration method. Compared with a uniformly mixed film, the resultant layered composite films that loaded with a low MXene and AgNWs content exhibit superior mechanical properties with a tensile strength of 137 MPa, a strain at break of 5.7%, excellent EMI shielding effectiveness (EMI SE) of 61.9 dB, and higher EMI SE/t of 20,653 dB cm −1 . This is attributed to the high-performance CNF substrate, the highly efficient layered structures, and extensive hydrogen-bonding interactions. In particular, a high degree of ohmic loss of multiple interfaces and polarization relaxation of local defects, as well as an abundance of terminal groups, favor the loss of electromagnetic waves (EMW) within the material. In addition, the prepared multifunctional layered composite films also show good antibacterial properties. As a result, the obtained new kind of flexible layered structure EMI shielding composite films with excellent EMI shielding performance, and mechanical properties present promising application prospects in the fields of EMI shielding and protection for aerospace, portable, and wearable flexible electronic devices.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Ting Liu,Na Zhang,Kaili Zhang,Yan Wang,Yiming Qi,Meng Zong
Two-dimensional layered metal carbides (MXene) have a broad application prospect in electromagnetic absorption, but suffer from poor impedance matching, which limits the absorbing performance. Herein, an efficient nanocomposite absorber was successfully prepared via loading Co-substituted β 2 -keggin-type polyoxometalate doped with polypyrrole and Fe 3 O 4 on the surface of MXene . Polyoxometalate and HCl as a proton acid doped polypyrrole, with anions attached to the main chain, could adjust the electromagnetic parameters, making the nanocomposites material easily achieve the best conductivity and impedance matching; Fe 3 O 4 introduced magnetic loss, and the freedom of movement of Fe 2+ and Fe 3+ caused multiple polarization; dipole polarization was induced by defects, dipoles and dangling bonds in nanocomposites; the charge accumulated at the three phase interface and led to interfacial polarization. We had conducted research on the absorbing properties of nanocomposites with different as-prepared unitary to ternary products, loading rates and component proportion. When the filling level was 45 wt%, an optimal reflection loss value of MXene/PPy@β 2 -SiW 11 Co/Fe 3 O 4 nanocomposites at only 1.7 mm reached up to −62.6 dB, and the effective absorption bandwidth of 9 GHz could be obtained at the low thickness range of 1.5–2.9 mm. These results demonstrated that the prepared nanocomposites were expected to be a promising electromagnetic wave absorber with thin thickness and high absorption intensity.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）