ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Chuanliang Wei,Huifang Fei,Yongling An,Yuchan Zhang,Jinkui Feng
Spinel LiMn 2 O 4 is considered to be a promising cathode for lithium-ion batteries owing to its low cost, safety, environmental friendliness , high operating voltage and natural abundance of manganese. However, the accelerated dissolution of manganese at elevated temperature results in serious capacity fading, which inhibits its further application in energy storage systems. The dissolution of manganese is mainly caused by the attack of trace acidic species (HF) in liquid electrolyte . Here, we report a facile, universal and effective strategy to suppress the dissolution of manganese at 55 °C by encapsulating LiMn 2 O 4 particles in crumpled Ti 3 C 2 T x nanosheets using an electrostatic self-assembly process. With high electronic conductivity and fast Li + transport capability, such protective layer reduces direct contact between liquid electrolyte and LiMn 2 O 4 particles, suppressing the dissolution of manganese. The composite exhibits larger discharge specific capacity, enhanced rate and cycling capabilities. The capacity retention ratio can be improved by 18.3% at 55 °C after 200 cycles at 2 C. This study provides a new strategy for suppressing the dissolution of manganese at high temperature and widens the road for the application of 2D MXene in energy storage field. The electrostatic self-assembly strategy we proposed is universal and can be applied in other cathode materials, which can arouse much interest of relevant researchers.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 39
·1904507
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IF 15.621
Hui Liao,Xuelin Guo,Pengbo Wan,Guihua Yu
Conductive hydrogels are attracting tremendous interest in the field of flexible and wearable soft strain sensors because of their great potential in electronic skins, and personalized healthcare monitoring. However, conventional conductive hydrogels using pure water as the dispersion medium will inevitably freeze at subzero temperatures, resulting in the diminishment of their conductivity and mechanical properties; meanwhile, even at room temperature, such hydrogels suffer from the inevitable loss of water due to evaporation, which leads to a poor shelf-life. Herein, an antifreezing, self-healing, and conductive MXene nanocomposite organohydrogel (MNOH) is developed by immersing MXene nanocomposite hydrogel (MNH) in ethylene glycol (EG) solution to replace a portion of the water molecules. The MNH is prepared from the incorporation of the conductive MXene nanosheet networks into hydrogel polymer networks. The as-prepared MNOH exhibits an outstanding antifreezing property (−40 °C), long-lasting moisture retention (8 d), excellent self-healing capability, and superior mechanical properties. Furthermore, this MNOH can be assembled as a wearable strain sensor to detect human biologic activities with a relatively broad strain range (up to 350% strain) and a high gauge factor of 44.85 under extremely low temperatures. This work paves the way for potential applications in electronic skins, human−machine interactions, and personalized healthcare monitoring.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Ruixiang Deng,Bingbing Chen,Haogeng Li,Ke Zhang,Tao Zhang,Yun Yu,Lixin Song
Microwave absorbers serve the purpose to ensure the transmission efficiency and accuracy in 5G telecommunications. Two-dimensional MXene has great potential in absorbing microwave. In this study, MXene(Ti 3 C 2 T x )/Co 3 O 4 composites are successfully fabricated by a facile and stable hydrothermal treatment in concentrated strong base and Argon environment, followed by a one-step annealing process. Phase composition , chemical state of elements, morphology and structure of the new composite materials are studied by systematical characterization. It is revealed that adsorbed Na + ions and terminations, which are generated at the interface during hydrothermal treatment in concentrated NaOH solution, can protect the Ti 3 C 2 T x from being decomposed. The synthesis mechanism is also proposed for stable fabrication of other MXene-based composite materials. The MXene/Co 3 O 4 composite is able to perform single-band absorption, multiband absorption and even broadband absorption in 2–18 GHz band by tuning its composition and thickness. Particularly, better than 90% absorption in a wide range of 10.8–17 GHz can be achieved with a thickness of just 2 mm. Enhanced wideband absorption originates from the multilayer structure , the surface defects , the conductivity of Ti 3 C 2 T x and the capacitance structure of Co 3 O 4 . Ultrathin and broadband high absorption features make the material a promising candidate for future application.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
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IF 5.16
Huawei Wei,Jidong Dong,Xiaojiao Fang,Wenhui Zheng,Yutong Sun,Yue Qian,Zaixing Jiang,Yudong Huang
MXene , as a new 2-dimensional (2D) material, has excellently potential applications in the field of electrochemistry owing to its high conductivity and fast charge transporting speed. Especially, MXene/polymer composites have attracted widely attentions due to their extensive application in the area of multi-functional materials. Herein, the composites of Ti 3 C 2 T x MXene/polyaniline (PANI) with different PANI contents have been successfully prepared. The microwave absorption mechanism of these materials was investigated. Attributing to the multiple layer structure, the dielectric property of Ti 3 C 2 T x MXene and PANI, and the synergistic effect between the Ti 3 C 2 T x and PANI, the as-prepared composites possessed a specific microwave absorbing behavior. With a proper content of PANI, the MXene/PANI composites in a paraffin matrix exhibited a maximum reflection loss of −56.30 dB at 13.80 GHz with the thickness of 1.8 mm. In addition, the effective absorption bandwidth (>90%) ranged from X-band (8–12.4 GHz) to Ku-band (12.4–18 GHz) with the tunable thickness ranging from 1.5 to 2.6 mm. The results indicate that MXene/PANI composites has great potential to be used in the field of microwave absorption.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 30
·7621-7628
·
IF 5.256
Xinliang Li,Xiaowei Yin,Meikang Han,Changqing Song,Xinnan Sun,Hailong Xu,Laifei Cheng,Litong Zhang
Herein, Ti2CTx MXene and its derivatives with various heterogeneous structures were constructed via etching and a facile oxidation treatment. The effect of different oxidation conditions on their structural evolution and phase composition was studied in detail. Compared with that of pristine Ti2CTx MXene, the improvement in the electromagnetic wave absorption capability of the as-prepared Ti2CTx/TiO2 and C/TiO2 nanocomposites was attributed to their enhanced polarization loss and stronger conductivity loss. The enhanced polarization loss is caused by the generated heterogeneous interfaces and higher specific surface area, and the stronger conductivity loss is due to the completely exfoliated carbon layers. Additionally, the remaining multilayered structure after exfoliation of the carbon layers favors energy dissipation. The C/TiO2 nanocomposites attain a minimum reflection coefficient of −50.3 dB at 7.1 and 14.2 GHz, and an effective absorption bandwidth of 4.7 GHz (covering the whole X-band) with a matching thickness of 2.1 mm; this indicates their excellent electromagnetic wave absorption properties. We believe that these nanocomposites with a heterogeneous structure also hold great promise for application in the fields of photocatalysis, lithium batteries, water purification, etc.
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ACS Sustainable Chemistry & Engineering
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2016
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IF 5.267
Zhiwei Zhang,Hanning Li,Guodong Zou,Carlos Fernandez,Baozhong Liu,Qingrui Zhang,Jie Hu,Qiuming Peng
Differing from graphene, the activated groups on the surface of layered two-dimensional titanium carbide (MXene) materials bestow superiority to self-assemble some novel MXene derivatives with intriguing chemical/physical properties. Here we first report a series of new MXene-Ag composites by directly mixing AgNO3 and alkalization-intercalated MXene (alk-MXene, Ti3C2(OH/ONa)2) solution containing polyvinylpyrrolidone (PVP) at room temperature, in which an analogous urchin-shaped MXene-Ag0.9Ti0.1 bimetallic nanowire composite exhibits unexpected electrocatalytic activity for the oxygen reduction reaction. The addition of PVP solution induces the formation of 5-fold nanotwin Ag seeds, which then grow into Ag/Ti (Ag0.9Ti0.1) bimetallic nanowires. The unique bimetallic nanowires favor a four-electron transfer process, and exhibit high current density and good stability by offering numerous oxygen adsorption sites and shortening the diffusion path of adsorbed oxygen. The results represent a new step for the electrocatalytic applications of MXene materials, and also motivate enthusiasm in the quest for new MXene derivations.
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Nanomaterials
·
2024
·Vol. 14
·期 10
·896
·
IF 4.4
Ching-Wen Lou,Meng-Meng Xie,Yan-Dong Yang,Hong-Yang Wang,Zhi-Ke Wang,Lu Zhang,Chien-Teng Hsieh,Li-Yan Liu,Mei-Chen Lin,Ting-Ting Li
In this study, a Ti3C2MXene@g-C3N4composite powder (TM-CN) was prepared by the ultrasonic self-assembly method and then loaded onto a carbon nanofiber membrane by the self-assembly properties of MXene for the treatment of organic pollutants in wastewater. The characterization of the TM-CN and the C-TM-CN was conducted via X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrometer (FTIR) to ascertain the successful modification. The organic dye degradation experiments demonstrated that introducing an appropriate amount of Ti3C2MXene resulted in the complete degradation of RhB within 60 min, three times the photocatalytic efficiency of a pure g-C3N4. The C-TM-CN exhibited the stable and outstanding photocatalytic degradation of the RhB solution over a wide range of pH values, indicating the characteristics of the photodegradation of organic pollutants in a wide range of aqueous environments. Furthermore, the results of the cyclic degradation experiments demonstrated that the C-TM-CN composite film maintained a degradation efficiency of over 85% after five cycles, thereby confirming a notable improvement in its cyclic stability. Consequently, the C-TM-CN composite film exhibits excellent photocatalytic performance and is readily recyclable, making it an auspicious eco-friendly material in water environment remediation.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2024
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IF 5.3
Deqiong Xie,Kecan Dou,Jiale Huang,Wenqian Zhai,Jing Shi,Lei Zhuang,Weidong Zhu,Fumin Zhang
The development of efficient and robust metal nanoparticle catalysts for the aerobic oxidation of benzyl alcohol is crucial for advancing green chemistry. This study presents a class of ceria nanoparticle catalysts, designated as Ce-NC/CFMX-T, where “T” denotes the pyrolysis temperature. These catalysts are synthesized by pyrolyzing a mixture of Ce-MOF-801/CFMX and dicyandiamide at high temperatures, aimed at the liquid-phase aerobic oxidation of 4-methoxybenzyl alcohol to 4-methoxybenzaldehyde, using molecular oxygen as the oxidizing agent and avoiding harmful additives or bases. Among the synthesized catalysts, Ce-NC/CFMX-973 exhibited exceptional catalytic efficiency, achieving over 99.9% conversion of 4-methoxybenzyl alcohol and complete selectivity for 4-methoxybenzaldehyde. This performance was achieved under moderate conditions, using xylene as the solvent at 373 K over 8 h and an oxygen pressure of 1 atm. Kinetic analysis revealed that the activation energy for oxidizing 4-methoxybenzyl alcohol using Ce-NC/CFMX-973 was 68.5 ± 3.0 kJ/mol, which is lower than the values observed for Ce-C/CFMX-973, Ce-NC-973, and Ce-C-973. The remarkable catalytic performance of the Ce-NC/CFMX-973 catalyst is attributed to the synergistic effects between CeO2 nanoparticles and oxygen vacancies, along with the support’s balanced acidity and basicity properties.
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IEEE SENSORS JOURNAL
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2024
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IF 4.3
Tianqing Liu,Yutao Rong,Gandong Zhou,Guangjian Zhang,Chen Su,Peipei Li,Xiaoqiang Yin,Gang Wang,Weiwei Wu,Lu Zhang
Wearable humidity sensors have attracted extensive interest because of their affordability, high sensitivity, portability, and ease of use in the rapidly developing fields of noncontact medical diagnostics, healthcare monitoring, and environmental sensing. However, achieving a high-performance and stable wearable humidity sensor for healthcare monitoring, such as respiration, is still challenging. In this work, we propose a simple direct-writing method for the in situ fabrication of wearable resistive-type humidity sensors based on Ti3C2Tx metal carbides/nitrides (MXene). The sensing performance of MXene/PP composite-based humidity sensors has been thoroughly investigated, including sensitivity (0.601%/%RH), response/recovery time (17/37 s), and stability (20 h under 84% RH). Moreover, we demonstrate that the proposed wearable humidity sensor can accurately recognize different breathing patterns and monitor human respiration in real time, enabling the evaluation of physiological conditions for early warning. In addition, it can easily monitor sleep quality and rapidly identify any issues with mask use. Even more, an MXene/PP composite-based humidity sensor matrix can be applied for noncontact gesture tracing. Therefore, this work provides a practical solution for the fabrication of wearable, high-performance humidity sensors for individualized healthcare monitoring in real time, which paves a solid path for the creation of personalized healthcare monitoring devices.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 12
·126503
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IF 3.1
Tinghua Li,Shuai Kang,Fan Zhang,Xiong Sheng,Shoubo Li,Wenqiang Lu,Donglai Zhu,Zhiqiang Li
The two-electron oxygen reduction reaction (ORR) using an electrochemical method is considered a viable green technology for generating H2O2. Platinum group metals demonstrate excellent H2O2 generation performance due to their superior ORR activity and stability. However, the high cost of these electrocatalysts is a significant barrier to the widespread adoption of this technology, prompting research into non-precious metal catalysts as alternatives. In this work, Co3O4 nanoparticles with sized from 5 to 10 nm were synthesized on MXene sheets. Compared with Co3O4/C and MXene, the results indicated that Co3O4/MXene exhibited the best electrochemical performances, with an electron transfer number of ∼3.1 during oxygen reduction and an H2O2 selectivity of ∼47%. Co3O4/MXene also demonstrated great stability. After 5000 cycles, the H2O2 selectivity and electron transfer number remained at 50% and 3.0, respectively. After 12 h of continuous testing, Co3O4/MXene exhibited a high Faraday efficiency of 50% and H2O2 yield of 0.14 mol h−1 g−1, with H2O2 selectivity increasing to 68.7% and an electron transfer number of 2.6. The excellent electrochemistry is attributed to the synergistic effect between MXene and Co3O4. This study provides valuable insights into non-precious metal electrocatalysts for H2O2 generation.
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高影响因子
Carbon Energy
·
2024
·
IF 19.5
Xuewen Jiang,Qian Wang,Limeng Song,Hongxia Lu,Hongliang Xu,Gang Shao,Hailong Wang,Rui Zhang,Changan Wang,Bingbing Fan
Material composition and structural design are important factors influencing the electromagnetic wave (EMW) absorption performance of materials. To alleviate the impedance mismatch attributed to the high dielectric constant of Ti 3 C 2 T x MXene, we have successfully synthesized core-shell structured SiO 2 @MXene@MoS 2 nanospheres. This architecture, comprising SiO 2 as the core, MXene as the intermediate layer, and MoS 2 as the outer shell, is achieved through an electrostatic self-assembly method combined with a hydrothermal process. This complex core-shell structure not only provides a variety of loss mechanisms that effectively dissipate electromagnetic energy but also prevents self-aggregation of MXene and MoS 2 nanosheets. Notably, the synergistic combination of SiO 2 and MoS 2 with highly conductive MXene enables the suitable dielectric constant of the composites, ensuring optimal impedance matching. Therefore, the core-shell structured SiO 2 @MXene@MoS 2 nanospheres exhibit excellent EMW absorption performance, featuring a remarkable minimum reflection loss (RL min ) of −52.11 dB (2.4 mm). It is noteworthy that these nanospheres achieve an ultra-wide effective absorption bandwidth (EAB) of 6.72 GHz. This work provides a novel approach for designing and synthesizing high-performance EMW absorbers characterized by “wide bandwidth and strong reflection loss.”
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Cuilian Wei,Haowei Tu,Pengcheng Zhang,Jiafeng Ouyang,Liyong Yuan,Zijie Li,Nannan Wang,Yanqiu Zhu,Kang Liu,Lin Wang,Weiqun Shi
The construction of novel MXene-based composites with superb abilities through functionalization is an effective strategy to enhance the potential of this emerging inorganic lamellar material for environmental adsorption applications. The present work systematically investigated the adsorption performance of Ti 3 C 2 T x MXene modified with phosphate functional groups that facilitate the capture of uranyl ions. After introducing phosphate groups via a two-step modification of 3-aminopropyltriethoxysilane (APTES) and phytic acid (PA), the synthesized Ti 3 C 2 -APTES-PA is significantly superior to pristine Ti 3 C 2 T x nanosheets in terms of adsorption capacity, adsorption selectivity and reusability for uranium. The maximum uptake capacity of Ti 3 C 2 -APTES-PA at pH = 5 reaches 323 mg/g, which is 2.5 times higher than that of unmodified MXene. Furthermore, the large selectivity coefficient (S U/M > 16.2) declares that Ti 3 C 2 -APTES-PA preferentially adsorbs uranium among substantial competing ions. Ti 3 C 2 -APTES-PA also shows good cycling performance that its adsorption capacity remained 92.3 % after 6 cycles. When it comes to treating simulated uranium tailings pond leachate and radioactive wastewater from mines, high U(VI) removal rates of 88.9 % and 96.8 % can be achieved by our ternary composite at a dosage of 0.05 g/L. The underlying adsorption mechanism was unraveled by spectroscopic analysis to be the formation of coordination complexes of uranyl ions with phosphate groups on PA and hydroxyl groups on Ti 3 C 2 T x substrate, as well as the reduction of a small amount of adsorbed U(VI) to U(IV) by MXene. The overall results imply that Ti 3 C 2 -APTES-PA is an effective uranium chelating scavenger for the treatment of environmental radioactive wastewater.
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