APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Jimei Liu,Fei Wang,Rong Guo,Yuqi Liu,Mengyu Zhang,Jaka Sunarso,Dong Liu
It is desirable to develop electromagnetic (EM) wave absorbers with anti-corrosion property that can suit various electronics, telecommunications, and military applications in harsh conditions. In this work, by varying the Co content in the 3D honeycomb MXene , Co/MXene composites with remarkable EM absorption performance were obtained. In particular, Co/MXene with 0.5 mmol Co displayed a minimum reflection loss (RL) of –54.3 dB at 2.34 mm and broad absorption bandwidth of 5.92 GHz at 2.02 mm. These Co/MXene composites also showed high resistance to corrosion as evidenced by very low corrosion current densities (10 −6 ∼ 10 −7 A cm −2 ) and very large polarization resistances (10 7 ∼ 10 8 Ω) when exposed to various corrosive conditions (acid, neutral, and alkaline conditions). The unique honeycomb architecture and the combined presence of Co and MXene enabled the electron transfer from Co to MXene as revealed by density functional theory simulation and suppressed the contributions from magnetic and conductive losses, thus allowing only polarization loss-originated EM dissipation behavior. Accordingly, this study introduces a simplified model to elucidate the mechanism of EM absorption, offering insights at the nano level.
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FlatChem
·
2023
·
IF 6.2
Chou-Kun Tang,Xi Zheng,Xiao-Liang Chen,Yu-Gang Fu,Qiu-Feng Lü
Electrocatalytic hydrogen production is an effective way to produce hydrogen energy, and the key is to find inexpensive and effective catalysts. Loading transition metal sulfides onto two-dimensional transition metal carbide (MXene) is an effective method to prepare cheap and high-performance hydrogen evolution reaction (HER) catalysts. In this study, Mo 2 TiAlC 2 was etched with hydrofluoric acid to prepare Mo 2 TiC 2 T x MXene, which was then composited with MoS 2 and CoS 2 to prepare defect-rich MoS 2 /CoS 2 @Mo 2 TiC 2 T x composite by a hydrothermal method. MoS 2 /CoS 2 provides a large number of active sites for electrocatalysis, while Mo 2 TiC 2 T x MXene as a carrier not only provides nucleation and growth sites for MoS 2 /CoS 2 , but also increases the rate of electron transfer in HER process, which achieves good synergy between MoS 2 /CoS 2 and Mo 2 TiC 2 T x MXene. Consequently, MoS 2 /CoS 2 -2@Mo 2 TiC 2 T x exhibits an excellent HER performance. When the current density reaches 10 mA cm −2 , the optimal MoS 2 /CoS 2 -2@Mo 2 TiC 2 T x catalyst only requires an overpotential of 80 mV, and exhibits good cycling stability and durability. This work gives a new idea for the preparation of efficient HER catalysts using non-precious metal composites to replace the precious Pt/C.
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LANGMUIR
·
2023
·
IF 3.9
Zhibiao Guo,Mingkun Wang,Lei Qiao,Jianxiang Wang,Zhiwei He
Frequent oil spills and the discharge of industrial oily wastewaters have become a serious threat to the environment, ecosystem, and human beings. Herein, a photothermal, magnetic, and superhydrophobic PU sponge decorated with a Fe3O4/MXene/lignin composite (labeled as S–Fe3O4/MXene/lignin@PU sponge) has been designed and prepared. The obtained superhydrophobic/superoleophilic PU sponge possesses excellent chemical stability, thermal stability, and mechanical durability in terms of being immersed in corrosive solutions and organic solvents and boiling water and being abrased by sandpapers, respectively. The oil adsorption capacities of the S–Fe3O4/MXene/lignin@PU sponge for various organic liquids range from 29.1 to 70.3 g/g, and the oil adsorption capacity for CCl4 can remain 69.6 g/g even after 15 cyclic adsorption tests. The separation efficiencies of the S–Fe3O4/MXene/lignin@PU sponge for n-hexane and CCl4 are higher than 98% in different environments (i.e., water, hot water, 1 mol/L NaOH, 1 mol/L NaCl, and 1 mol/L HCl). More importantly, the introduction of three light absorbers (i.e., Fe3O4, MXene, and lignin) into the S–Fe3O4/MXene/lignin@PU sponge shows a synergistic effect in the photothermal heat conversion performance, and the maximum surface temperature reaches 64.4 °C under sunlight irradiation (1.0 kW/m2). The separation flux of the S–Fe3O4/MXene/lignin@PU sponge for viscous LT147 vacuum pump oil reaches 35,469 L m–2 h–1 under sunlight irradiation, showing an increase of 27.3% compared to that of oil adsorption processes without the photothermal effect. Thus, the rational design of superhydrophobic sponges by introducing proper photothermal heat absorbers provides new insights into facile and cost-effective preparation of sponges for efficient oil/water separation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Tong Wu,Fang Ren,Zhengzheng Guo,Jiale Zhang,Xin Hou,Zhengyan Chen,Yanling Jin,Penggang Ren
The flourishing development of electronic devices and radar detection technologies necessitates the urgent creation of high-efficiency electromagnetic wave (EMW) absorption materials with expansive absorption bandwidths. Although MXene has garnered significant interest in the domain of EMW absorption due to its tunable dielectric properties and structural designability, its high permittivity often results in poor impedance matching and a single loss mechanism, which makes it difficult to realize optimal EMW absorption capabilities. In this work, CoNi bimetallic metal–organic frameworks (MOFs) derived bayberry-like magnetic porous carbon (CoNiMPC)@carbon nanotubes (CNTs)/MXene (CNCM) hybrids were initially synthesized via simple solution precipitation, thermal treatment, and electrostatic self-assembly strategy. As anticipated, excellent EMW absorption characteristics were achieved by adjusting the ratio of CoNiMPC@CNTs and MXene. Multi-heterointerfaces consisting of zero-dimensional porous carbon , one-dimensional carbon nanotubes, and two-dimensional (2D) MXene, electrical/magnetic coupling effects, and polarization loss induced by abundant heterointerfaces endow the prepared CNCM hybrids with high-performance EMW absorption. Notably, the CNCM-7 hybrid material exhibits a minimum reflection loss (RL min ) of − 65.3 dB at 6.8 GHz with a mere 2.7 mm thickness and an effective absorption bandwidth (EAB, RL < −10 dB) of 5.0 GHz at a thickness of 1.27 mm. This study proposes a unique viewpoint and approach towards the design and preparing high-performance MXene-based EMW absorption materials.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Liangliang Zha,Chuanying Wei,Junjun Liu,Yang Yang,Bo Wu,Xianhui Zhang,Jianhua Wu
In recent years, MXene has gained widespread attention in the field of microwave absorption (MA) due to its unique two-dimensional layered structure, excellent electrical conductivity , and chemically active surface. However, the MA mechanism of MXene is limited to dielectric loss alone, which poses a challenge in meeting the performance requirements of new absorbers. Therefore, to enhance the performance of MXene in MA, this paper successfully prepared Fe 3 O 4 /NC@MXene (FNCM) composites by modifying core-shell magnetic nanoparticles of nitrogen-doped carbon coated Fe 3 O 4 (Fe 3 O 4 /NC) on MXene. By adjusting the dose of Fe 3 O 4 /PDA precursor, the impedance matching is further optimized. FNCM-2 demonstrates superior MA performance with a thickness of 2mm, achieving a minimum reflection loss (RL min ) of −54.41 dB and an effective absorption bandwidth (EAB) of 7.32 GHz. Meanwhile, the RL min of the FNCM-1 sample at a thickness of 2 mm can reach −55.65 dB. The remarkable improvement in MA performance can be attributed to the synergistic effect of dielectric and magnetic losses, which optimizes impedance matching. This study is expected to provide insights for the development of efficient and broadband MXene-based MA materials.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Yawen Pan,Meiru He,Jing Wu,Hongbin Qi,Yuanyuan Cheng
Wearable biosensors have gained substantial attention for their capacity to deliver real-time and continuous physiological information through noninvasive and dynamic monitoring of biochemical markers in biological fluids. In particular, wearable and flexible electrochemical sensors have found extensive usage for the detection of biomarkers in human sweat in a quantifiable and noninvasive manner. Herein, we present a novel MXene-functionalized PEDOT:PSS conducting composite hydrogels-based electrochemical biosensor for continuous noninvasive monitoring of human glucose. Ethylene glycol (EG) was added to the hydrogel throughout the preparation process, aiding in the expansion of the polymer chains and resulting in excellent electrical conductivity and porous networks, which helps to increase the film-forming properties, flexibility and stability of the material, and also improves the stacking and peeling problems of powdered materials. The limit of the hydrogel biosensor for glucose detection was as low as 1.9 μM and the sensitivity was 21.7 μA⋅mM −1 ⋅cm −2 . Furthermore, the hydrogel incorporated with screen-printed carbon electrodes (SPCE) was employed to the human body for continuous noninvasive sweat glucose monitoring as the skin patch in vitro. The results of the biosensor showed good correlation with glucose meter readings. We believe that this glucose biosensor lays the foundation for noninvasive wearable monitoring of glucose in diabetic patients.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Jiawei Zhang,Qianjun Ling,Qixuan Wang,Chenxi Xu,Haibing Wei,Richard Espiritu
Combined high ionic conductivity and high mechanical properties are the requirements of the electrolyte membrane for alkaline anion exchange membrane fuel cells. Quaternary ammonium groups functionalized MXene as filler could improve the mechanical strength and ionic conductivity of membrane. In this work, a Quaternized poly(p-terphenylene piperidinium) (QPAP) /Quaternary MXene(NH 4 –Mo 2 Ti 2 C 3 T x )/QPAP triple-layer membrane was fabricated. The OH − ionic conductivity of the triple-layer QPAP/NH 4 –Mo 2 Ti 2 C 3 T x /QPAP membrane is 0.121 S cm −1 at 80 °C, which is around 53 % higher than that of the pristine QPAP. The QPAP/NH 4 –Mo 2 Ti 2 C 3 T x /QPAP membrane exhibits peak power density of 540 mW cm −2 . The improved conductivity and performance of AEM could be attributed to the quaternary ammonium groups on the NH 4 –Mo 2 Ti 2 C 3 T x surface as the vehicle for OH − transport. The QPAP/NH 4 –Mo 2 Ti 2 C 3 T x electrolyte membrane was also observed to exhibit high stability. Moreover, QPAP/NH 4 –Mo 2 Ti 2 C 3 T x /QPAP with a three-layer structure membrane exhibits a high tensile strength (TS, ∼68 MPa) and high elongation at break (EB, ∼21 %), which reach about three times that of the pristine QPAP membrane.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Taian Zhang,Wenjuan Han,Jie He,Xiaofeng Wang,Bo Wang,Chuntai Liu,Changyu Shen
The interfacial solar vapor generator (ISVG) has emerged as a promising solution to address freshwater scarcity. The enhancement of thermal localization and suppression of salt crystallization are recognized as the design key factors for ISVG. In this study, we successfully fabricated a novel double-layer structure degradable interfacial solar vapor generator (DISVG) utilizing chitosan monolith (CM) with honeycomb porous morphology as carrier material, while employing MXene nano-sheets as solar absorber. The fabrication process involved facile chemical crosslinking and dip-coating methods. The incorporation of the double-layer structure in the DISVG plays a significant role in achieving effective thermal localization, thereby minimizing heat transfer to bulk water. Consequently, this feature results in a remarkable improvement in evaporation rate while simultaneously enhancing salt resistance. The DISVG demonstrated an outstanding evaporation rate of 3.88 kg m -2 h - 1 under 1 sun (1 kW m - 2 ) irradiation and effectively removed more than 99% of salt and dyes in water. Interestingly, even without the presence of MXene, the DISVG still achieved efficient evaporation at a rate of 2.63 kg m -2 h - 1 under 1 sun irradiation. Moreover, both DISVGs exhibited stability over extended period of operation without any rate decay. This study not only presents a novel approach for the progress of environmentally friendly and cost-efficient ISVG but also offers valuable insights into overcoming the trade-off between thermal localization and salt resistance in such systems.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 44
·15571-15580
·
IF 6.4
Xinsheng Zhou,Zhuoran Hou,Hua-Yu Zhang,Jie Yu
Layered double hydroxides (LDHs) are promising energy materials due to their considerable theoretical capacity, but they also suffer from inherent poor electrical conductivity and agglomeration problems. In this study, a composite electrode material with a unique structure was synthesized by in situ growth of nanoscale NiVAl-LDH on the surface of few-layered Ti3C2Tx–MXene. The strong interfacial connection and enhanced electronic coupling between the two components enhance the structural stability and electrical conductivity of the material, significantly enhancing its redox kinetics. Moreover, this composite structure effectively prevents the aggregation and restacking of Ti3C2Tx–MXene and NiVAl-LDH nanosheets, ensuring the complete exposure of active sites. Demonstrating exceptional electrochemical capabilities, the composite electrode showcases a distinct capacitance of 186.7 mA h g−1 at a current density of 1 A g−1. Furthermore, it maintains an impressive 84.7% of its capacitance after enduring 5000 charge–discharge cycles at a high current density of 10 A g−1. The assembled asymmetrical supercapacitor device demonstrates a respectable energy density of 51.6 W h kg−1 at a power density of 800.0 W kg−1, as well as excellent cycling stability (89.1% capacitance retention after 10 000 cycles at 10 A g−1).
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 38
·15100-15115
·
IF 4.5
Zhu Yuying,Ling Xin,Dong Qian,Liu Qinglei,Wu Yu,Jin Qingjun,Zhang Wang
The development of advanced microwave absorbing materials with high absorption intensity and broad bandwidth is crucial for applications in electromagnetic interference shielding and stealth technology. In this study, we propose a novel hybrid material composed of porous magnetic nanospindle@poly(3,4-ethylenedioxythiophene) (PEDOT)/MXene (Fe@P/MX), designed to achieve superior microwave absorption performance through impedance matching and electromagnetic loss mechanisms. The conductive PEDOT and MXene, combined with magnetic nanospindles, enable impedance matching and promote dielectric loss, which ultimately enhances microwave absorption. Additionally, the hybrid material contains multiple interfaces that induce interface polarization and strong absorption of electromagnetic waves. Electromagnetic parameters of composites can be easily modulated by adjusting the content of PEDOT, thereby optimizing microwave absorption performance. The results demonstrate improved performance compared to existing materials, with the minimum reflection loss of − 60.6 dB at 17.0 GHz under the thickness of 1.6 mm. Besides, the effective absorption bandwidth extends to 5.4 GHz under the thickness of 1.9 mm. This core–shell hybrid material has significant potential for practical applications requiring efficient microwave absorption. Graphical abstract
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiwen Qin,Changkun Ding,Yingying Tian,Jiankang Dong,Bowen Cheng
The uncontrolled release of nitrophenol and dye pollutants into water systems is an increasingly serious worldwide concern, and thus efficient wastewater treatment technologies are urgently needed. Herein we report a novel two-dimensional (2D) transition metal carbides and/or nitrides (Ti3C2Tx MXene) membrane modified with silver nanowires (AgNWs) by vacuum assisted filtration technology for the ultrafast nitrophenol catalysis and water purification applications. Regular and controllable membrane transport channels were constructed by stacking Ti3C2Tx MXene nanosheets. Furthermore, the intercalation of AgNWs into the Ti3C2Tx MXene interlayer greatly enlarged the interlayer spacing, resulting in more gaps for fast and selective molecular transport. The optimized Ti3C2Tx MXene@AgNWs (M@A) membrane exhibited a water flux up to ∼191.9 L/(m2 h) while maintaining a high bovine serum albumin (BSA) rejection of ∼95.4%. We emphatically used M@A membranes as efficient catalysts for the reduction of 4-nitrophenol (4-NP), and the results indicated that M@A-12% membrane exhibited the greatest catalytic reduction ability, and recycling utilization. M@A-12% membrane also had an antibacterial rate of more than 99% against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). This work provides a possibility to expand the application of 2D multifunctional M@A membranes in wastewater treatment and pollutant catalytic degradation.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xinyu Liu,Qianqian Fu,Zhichao Li,Hui Wang,Jianwei Ren
To address the growing demand for efficient and stable energy storage in the context of green energy, in this study, an acid etching method was employed to in-situ grow Ni(OH) 2 nanosheet arrays on a nickel foam (NF) substrate. Subsequently, negatively charged Ti 3 C 2 T x MXene nanosheets were electrophoretically deposited onto the Ni(OH) 2 /NF surface to result in a MXene/Ni(OH) 2 /NF composite electrode material. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations revealed the homogeneous dispersion distribution of nanosheets on the material surface. The composite material exhibited high electrical conductivity and good hydrophilicity by rapid water infiltration within 150 ms. Furthermore, the Motte-Schottky effect establishes a distinctive pathway for electron transfer , which leads to the creation of electron vacancies or ‘holes’ on the MXene surface. This phenomenon significantly boosts MXene's electrochemical activity and enhances its affinity for OH − ions in the electrolyte, which consequently improves the performance of electrochemical capacitors . Electrochemical tests verified that the prepared MXene/Ni(OH) 2 /NF electrode displayed an areal specific capacitance of 0.223 mAh cm −2 at a current density of 1 mA cm −2 . The electrode displayed excellent rate performance with a capacity retention rate of 71 % when the current density was increased by five times. In addition, the assembled asymmetric capacitor with MXene/Ni(OH) 2 /NF electrode demonstrated an excellent cycling stability with only a 16.38 % capacity loss after 5000 cycles. It also exhibited the remarkable specific capacitance and long-term stability by achieving a high energy density of 43.68 Wh kg −1 and a power density of 424.96 W kg −1 . These results highlight the electrode's exceptional performance in terms of energy storage and power delivery.
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