CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huajun Xu,Jiaxing Fan,Di Pang,Yingying Zheng,Gang Chen,Fei Du,Yury Gogotsi,Yohan Dall'Agnese,Yu Gao
Ferric vanadate (FeVO 4 ) is a desirable anode candidate for lithium-ion battery (LIB) and sodium-ion battery (SIB) because of its high theoretical capacity, low cost and ease of synthesis. However, its practical application is hindered by its volume expansion during the Li + /Na + insertion/extraction and low electronic conductivity. Herein, flexible and free-standing FeVO 4 /Ti 3 C 2 T x (FVO/MX) films have been made via combining FeVO 4 nanorods and Ti 3 C 2 T x MXene sheets via a simple method of vacuum assisted filtration. In the composite films, Ti 3 C 2 T x sheets act as host and FeVO 4 nanorods are uniformly deposited onto the layers. FeVO 4 nanorods are encapsulated by Ti 3 C 2 T x sheets, forming a three-dimensional network sandwich structure. The binder-free FVO/MX films exhibited superior electrochemical performance due to the synergyy between FeVO 4 and Ti 3 C 2 T x . Specifically, when FVO/MX electrode was used in a lithium-ion battery, it delivered reversible capacity of 1179 mAh g −1 and 1125 mAh g −1 after 250 cycles at a current density of 0.1 A g −1 . Besides, the FVO/MX = 2:1 anode delivered a reversible capacity of 428 mAh g −1 at 5 A g −1 and 69.5% capacity was retained after 2500 cycles. Moreover, the Na-ion storage capacity reaches 129 mAh g −1 at a high current density of 5 A g −1 , showing capacity retention of 81.1% after 5000 cycles. The charging and discharging mechanism of the FVO/MX based lithiumion battery was studied by in-situ XRD technique. Owing to high metallic conductivity and 2D morphology of Ti 3 C 2 T x MXene, 3D networks can be constructed by combining other active agents, suggesting that MXene is a promising host material for the next-generation flexible energy storage devices.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xuelei Feng,Jianguang Yuan,Yujie Lv,Bogu Liu,Haixiang Huang,Bao Zhang,Youhua Yan,Shumin Han,Ying Wu
Magnesium borohydride (Mg(BH 4 ) 2 ) is an attractive materials for solid-state hydrogen storage due to its high hydrogen content (14.9 wt%). In the present work, the dehydrogenation performance of Mg(BH 4 ) 2 by adding different amounts (10, 20, 40, 60 wt%) of two-dimensional layered Ti 3 C 2 MXene is studied. The Mg(BH 4 ) 2 -40 wt% Ti 3 C 2 composite releases 7.5 wt% hydrogen at 260 °C, whereas the pristine Mg(BH 4 ) 2 only releases 2.9 wt% hydrogen under identical conditions, and the onset desorption temperature decreases from 210 °C to a relative lower temperature of 82 °C. The special layered structure of Ti 3 C 2 MXene and fluorine plays an important role in dehydrogenation process especially at temperatures below 200 °C. The main dehydrogenation reaction is divided into two steps, and activation energy of the Mg(BH 4 ) 2 -40 wt% Ti 3 C 2 composite is 151.3 kJ mol −1 and 178.0 kJ mol −1 , respectively, which is much lower than that of pure Mg(BH 4 ) 2 .
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hui Zong,Ruijuan Qi,Ke Yu,Ziqiang Zhu
Hydrogen evolution is of great significance for reducing carbon emissions and realizing carbon-neutral. Hydrogen evolution reaction (HER) by water splitting has no carbon emissions and pollution, but it is still necessary to reduce cost and enhance catalytic activity. Herein, we report an ultra-thin Ti 2 NT x MXene-wrapped metal-organic frameworks (MOFs)-derived CoP composite (Ti 2 NT x @MOF-CoP), which is a bifunctional catalyst with low cost and high activity. We synthesize the Ti 2 NT x @MOF-CoP composite by phosphating the precursor ZIF-67 self-assembled with Ti 2 NT x MXene nanosheets. The Ti 2 NT x @MOF-CoP electrode shows competitive hydrogen evolution performance in a wide pH-range (current density of 10 mA cm −2 ) and has a low overpotential ( η ) of 112 mV in pH = 14 especially. The Ti 2 NT x @MOF-CoP electrode for OER also has a low η = 241 mV at 50 mA cm −2 . Based on the bifunctional activity of Ti 2 NT x @MOF-CoP in alkaline, we set a dual-electrode configuration for HER and OER. It has a bias of 1.61 V at 10 mA cm −2 , with impressive catalytic stability during a 20 h measurement. MOFs-derived CoP has a large specific surface area and strong catalytic activity. Ti 2 NT x as a novel member of the MXene family not only can increase the active sites, but also can improve the stability of heterojunction catalysts. It reveals that the Ti 2 NT x @MOF-CoP composite has great potential in hydrogen evolution and water oxidation, thus reducing carbon emissions and protecting the environment.
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PLASMA SCIENCE & TECHNOLOGY
·
2021
·Vol. 23
·期 11
·115403
·
IF 1.567
Weisheng CUI,Qiaolu LIN,Hongbo LI,Shuai ZHAO,Yunge ZHANG,Yifan HUANG,Shuting FAN,Yiling SUN,Zhengfang QIAN,Renheng WANG
The formation of homogeneous dielectric barrier discharge (DBD) in air is a key scientific problem and core technical problem to be solved for the application of plasmas. Here, we report the effect of two-dimensional (2D) nanomaterial Ti3C2Tx (Tx = –F, –O and/or –OH) on regulating the electrical discharge characteristics. The field emission and weak bound state property of Ti3C2Tx can effectively increase the seed electrons and contribute to the generation of atmospheric pressure homogeneous air DBD. The electron avalanche development for the uneven electrode structure is calculated, and the discharge mode transition is modeled. The comparative analyses of discharge phenomena validate the regulation of Ti3C2Tx on the discharge characteristics of DBD. The light emission capture and the voltage and current waveforms verify that the transition of Townsend discharge to streamer discharge is effectively inhibited. The optical emission spectra are used to characterize the plasma and confirm that it is in a non-equilibrium state and the gas temperature is at room temperature. This is the first exploration of Ti3C2Tx on the regulation of electrical discharge characteristics as far as we know. This work proves the feasibility of Ti3C2Tx as a source of seed electrons to form homogeneous DBD, establishing a preliminary foundation for promoting the application of atmospheric pressure non-equilibrium plasma.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yifei Qu,Xiang Li,Xiu Wang,Hongqi Dai
The electromagnetic interference and heat accumulation pose a significant challenge for the traditional high-density single-function electromagnetic shielding materials in advanced flexible integrated electronics. Herein, nano-silver flakes (AgNFs, reflective layer), MXene (Ti 3 CNTx, loss layer) and silver nanowires (AgNWs, heat conduction and shielding layer) constructed ordered multi heterogeneous layers high-performance flexible electromagnetic shielding functional composites (AMA composites). Especially the composites exhibited outstanding electromagnetic interference shielding efficiency (EMI SE) of 70.96 dB even with an extremely thin coating of 25 g/m 2 , which is 350% higher than that of the commercial standard (20 dB). It is worth noting that the AMA composites also possessed certain qualities such as superior thermal conductivity , flame retardancy, chemical resistance, high-temperature resistance (25 °C–100 °C), and mechanical properties (tensile strength of 44.4 MPa, Young's modulus of 0.6 GPa). The composites display application possibilities in highly integrated advanced flexible electronic products and wearable electronic devices, as well as provide structural design and research ideas for the usage of a new MXene material (Ti 3 CNTx) in electromagnetic shielding composite materials.
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高影响因子
Russian Journal of Physical Chemistry A
·
2025
·Vol. 99
·期 3
·620-628
·
IF 0.8
Lei Bai,Cheng Fangming,Dong Yuting
Antimony sulfide (Sb2S3) possesses a high theoretical capacity and excellent reversibility, making it a promising anode material for lithium-ion batteries (LIBs). However, its poor intrinsic conductivity and significant volume changes during charge/discharge cycles severely limit its cycling stability and rate performance. In this study, a novel composite material was synthesized by electrostatically assembling Sb2S3 nanowires (Sb2S3 nw) onto MXene nanosheets as a potential anode material (SbSMX). The introduction of highly conductive MXene substrates enhances electron transfer between the distinct interfaces of Sb2S3 and MXene. Additionally, the constructed 1D–2D structure promotes ion transport within the electrode, while the mechanical flexibility of MXene effectively mitigates the severe volume expansion of Sb2S3. As a result, the SbSMX composite exhibits a high capacity of 813 mA h g–1 at a current of 50 mA g–1, stable cycling performance with a capacity of 735 mA h g–1 after 100 cycles at 100 mA g–1 (88% retention), and excellent rate capability, achieving 466 mA h g–1 at a current of 3 A g–1.
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高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Ying Yuan,Qiao You,Shunjian Qiu,Zhiming Wang,Yunhua Chen,Chaoyang Wang,Li Zhou,Hongxia Liu
Existing electromagnetic shielding materials often suffer from issues such as high reflectivity, limited adaptability, and a lack of self-healing capabilities when they are applied. This study investigates electromagnetic shielding materials (MNWPA or MNPPA) developed by integrating MXene (Ti3C2Tx), magnetic nickel nanowires (Ni NWs), or Ni nanoparticles (Ni NPs) into a dual network hydrogel of poly(vinyl alcohol) and poly(acrylic acid). This unique network structure imparts excellent self-healing capabilities to the materials through reversible dynamic covalent, ionic, and hydrogen bonds. This grants the hydrogel robust mechanical properties even after undergoing self-healing within 1 h of damage. The incorporation of MXene and Ni not only enhances conductivity but also achieves favorable impedance matching, resulting in effective electromagnetic interference (EMI) shielding properties for the hydrogel. Notably, the observed shielding mechanism is primarily based on absorption. Interestingly, the MNWPA and MNPPA hydrogels exhibit distinct absorption and reflection losses due to the differing morphologies between Ni NW and Ni NPs. Furthermore, after cut-healing treatment, the MNWPA hydrogels show a higher retention rate of EMI shielding effectiveness (EMI SE). Conversely, after undergoing multiple stretching behaviors, the MNPPA hydrogels demonstrate a higher retention rate of EMI SE. These findings further emphasize the impact of the Ni NW and Ni NP morphologies on the EM shielding performances of the hydrogels. Additionally, the MNWPA and MNPPA hydrogels display a sensitive deformation response and can serve as strain sensors to monitor various movements of the human body. Hence, our study offers a valuable reference for exploring composite EM shielding materials incorporating Ni NW or Ni NPs.
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CARBON
·
2024
·
IF 10.5
Liang Yin,Yiqian Wang,Ziqi Zhao,Yuyan Liu,Ningning Cao,Ting Shi,Xiaolong Zhang,Zhen Yu,Jingfeng Wang,Zhimin Fan
MXene (Ti 3 C 2 T x ) nanosheets produced through wet etching are typically obtained as low-concentration (<1 wt%) aqueous dispersions, leading to challenges like easy oxidation, high storage and transportation costs, and difficulties in direct processing. Here, we introduce a rapid and efficient technique to capture and semi-solidify single-layer MXene nanosheets using an erasable capture agent, transforming low-concentration MXene dispersions into high-solid-content (>85 wt%) semi-solids within minutes. This approach preserves the intrinsic properties of the MXene, imparts long-term stability, and enables reversible redispersibility. Importantly, the capture agent is fully removable without special treatment and can be recycled. Moreover, the method generalizes to other MXene compositions (e.g., Ti 2 CT x ) and hydrophilic two-dimensional materials such as graphene oxide. Devices fabricated from semi-solid MXene stored for extended periods exhibit excellent functionalities including infrared stealth, Joule heating, electrochemical energy storage, and electromagnetic interference shielding. This rapid capture and semi-solidification strategy significantly streamlines the transition from MXene synthesis to practical applications, paving the way for industrial-scale utilization of MXene.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hongli Zhang,Yiling Zheng,Hongwei Zhou,Shilin Zhu,Jie Yang
Two-dimensional (2D) nanomaterial-based membranes display attractive properties in molecular separation and transport, which holds their great promise for a host of applications. However, notorious swelling problem of 2D membranes result in unsatisfactory molecular/ions sieving performance, and the enhancement of structural stability for 2D membranes in aqueous solution is still challenging. Herein, we demonstrate how to efficiently stabilize the Ti 3 C 2 T x MXene laminar architecture by the insertion of flexible and hydrophilic carboxylated cellulose nanofibers (CNFs). The importing of CNFs not only acted as a bridge to combine the adjacent 2D Ti 3 C 2 T x sheets and enhance mechanical strength, but also assumed the role of pillar to fix the interlayer distance effectively and improve the anti-swelling properties of Ti 3 C 2 T x membrane. Moreover, the intercalation of nanocelluloses into the interlayer of delaminated Ti 3 C 2 T x is able to distinctly increase the interlayer spacing and create more open gaps for fast and selective molecular transport. When applied in antibiotics separative filtration process, the resultant membrane exhibits outperformed anti-swelling properties in water environment up to 76 h and simultaneously possesses satisfactorily high selectivity of antibiotics (∼99.0 % for azithromycin) with unprecedentedly high pure water permeance (∼26.0 L m −2 h −1 bar −1 ). Such 2D membranes can be easily fabricated by a facile and patternable vacuum-assisted filtration and nanocellulose induced self-assembly strategy, which holds great potential for their scalability that are applicable to many applications such as seawater desalination, industrial wastewater treatment and remediation of aquatic environment.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Shan Xue,Yue Sun,Jing Cao,Haili Lin,Xiaoling Zang,Shifu Chen
MXene is a promising two-dimensional (2D) metal carbides and nitrides materials for energy storage devices, due to its efficient, low-cost and eco-friendly synthesis technology. MXene possesses high mechanical strength , metallic conductivity, and excellent capacitance performance. However, traditional electrode films obtained from 2D nanomaterials suffer from restacking issue, which hinders the transmission of ion and results in slow ion transport dynamics between layers. The improvement of ion transfer rate of MXene electrode materials is a hot spot in the current research of 2D nanomaterials . Herein, we fabricated the Ti 3 C 2 T x MXene/aramid nanofiber (ANF) composite film with high specific surface area via a freezing method. The obtained MXene/ANF composite film presents high specific capacitance (174.3 F g −1 at a current density of 0.05 A g −1 ), excellent rate performance and high cycling stability (∼84.4% capacity retention after 10 000 cycles). The improvement of electrochemical performance is attributed to the smaller size of 2D sheets that effectively shorten ion diffusion path. Thus, both the diffusion rate and storage ability of electrolyte ions increase in the interstitial space between 2D sheets. In addition, ANF obtained from the commercial Kevlar yarns interacted with 2D sheets to enhance the mechanical strength of the composite films. Thus, the self-supporting MXene/ANF composite film with high specific surface area can be used as an electrode material of supercapacitors to present high specific capacitance and excellent cycling stability. This work provides a simple and effective way to construct high specific surface area 2D materials that present huge potential in energy storage fields.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Jun Ma,Yuanyuan Wang,Hang Xu,Mingmei Ding,Li Gao
Per- and polyfluoroalkyl substances (PFAS) are a class of ‘forever chemicals’ that have become a global concern owing to their innate chemical stability on humans and water resources. The separation of PFAS from water resources via membrane technologies are facing huge challenge. High permeance and rejection membrane are required for PFAS. To achieve this goal, herein, we propose an MXene-reinforced interfacial polymerization of negatively charged polyamide (PA) membranes for high rejection of short-chain PFAS. The morphologies and chemical properties were systematically investigated for the fabricated membrane. Attributed to the hydrophilic of MXene , the permeance of MXene-PA membranes increased without sacrificing rejection. Density functional theory (DFT) calculations and various experiments elucidated in detail the underlying mechanism of the interactions between the membrane and PFAS. The enhanced electrostatic interaction and hydrogen bonding leaded to increased PFAS rejection and permeance. Therefore, the MXene-regulated PA membrane effectively solved the trade-off between the selectivity and permeability. This work shows that MXene-regulated interfacial polymerization techniques can be used to tailor the effectiveness of PA nanofiltration membranes to overcome the trade-off phenomenon and pave the way for solving the crisis of short-chain PFAS.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yushun Zhao,Cheng Yan,Tianqi Hou,Hongli Dou,Hao Shen
Although advances in industrial products have brought convenience to our lives, severe weather has increased the safety risks to industrial facilities. Considerable efforts have been made to develop high-performance superhydrophobic anti-icing coatings. Nevertheless, designing a functional coating with both anti-icing properties and self-deicing remains a major challenge. Here, we propose a design strategy to exploit a photothermal superhydrophobic multifunctional coating with excellent anti-icing and deicing properties based on MXene by high-temperature sintering and layer-by-layer coating. Specifically, poly(tetrafluoroethylene) (PTFE) particles provide low surface energy and binding effects. Room-temperature-vulcanized silicone rubber (RTV) enhances the dispersion of the composite particles and the adhesion of the functional coating to a glass substrate. Furthermore, the functional coatings constructed with MXene exhibit outstanding photothermal effects, imparting excellent superhydrophobicity (CA = 160.18°, SA = 1.8°) and efficient photothermal conversion (equilibrium temperature of 109.3 °C). An anti-icing/deicing test is simulated to confirm their efficient anti-icing/deicing performance in practical applications. Overall, the functional coatings designed in this work can be applied in real industrial facilities.
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高影响因子
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