Fundamental Research
·
2025
·
IF 6.3
Zhong Wang,Tuo Zang,Ye Ziyu,Siyuan Zhang,Guojian Li,Xiaoming Liu,Qiang Wang,Shuang Yuan
Precise anchoring and high-density utilization of platinum single atoms (Pt SA ) remain critical challenges in advancing efficient hydrogen production via water electrolysis. Here, we present an innovative magnetic-field-assisted electrodeposition strategy for the controllable synthesis of high-density Pt SA on two-dimensional MXene substrates. Application of a 0.6 T magnetic field significantly enhanced Pt SA deposition kinetics, yielding a 2.1-fold increase in the deposition rate. Numerical simulations confirmed that magnetohydrodynamic (MHD) effects induced by the magnetic field were the primary mechanism driving this enhanced deposition efficiency. The optimized Pt SA -0.6@MXene/NF catalyst exhibited outstanding hydrogen evolution reaction (HER) performance in 1 M KOH, achieving an ultralow overpotential of 12 mV at 10 mA cm −2 , along with a Tafel slope of 29 mV dec −1 . Notably, the catalyst demonstrated 66.1-fold higher Pt mass activity (3458.7 A g −1 ) compared to commercial Pt/C (52.3 A g −1 ) at a 50 mV overpotential. Density functional theory (DFT) calculations revealed that the high-density Pt SA configuration synergistically enhances MXene's electrical conductivity while lowering the d-band center, thereby optimizing the energy barrier for hydrogen intermediate (H*) adsorption. This work provides a novel strategy for regulating the magnetic-field-assisted deposition of Pt SA catalysts, offering a new avenue for designing high-performance water electrolysis catalysts.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Si-ruo Chen,Ting Wang,Xinyi Zhuo,Yu-xing Wang,Li-guang Wu
Aiming to enhance permeation and anti-fouling performance of PVDF membrane, IL/PVDF and MXene-IL/PVDF mixed matrix membranes (MMMs) were fabricated by incorporating 1-hexyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ionic liquid (IL) and MXene-IL. The microstructures of IL/PVDF and MXene-IL/PVDF MMMs were characterized by TEM, SEM, FTIR, XRD, and XPS analysis. The performance of the MMMs was evaluated in the dead-end filtration, and results showed that IL addition would increase the pore size and hydrophilicity of IL/PVDF MMMs, thereby enhancing water flux and anti-fouling performance of the MMMs. However, IL would be dissolved out from IL/PVDF MMMs during the filtration process, which would depress the flux recovery rate of the MMMs. For MXene-IL/PVDF MMMs, IL was encapsulated by intercalating into the MXene nanosheets and effectively prevented the loss of IL from Mxene-IL/PVDF MMMs in the running process. MXene-IL/PVDF MMMs had high water flux and antifouling performance, and the maximum flux recovery rate of MXene-IL co-incorporated PVDF MMMs reached 96% after four-cycle filtration, and the corresponding water flux was 129.37 L·m −2 ·h −1 . Compared with PVDF membrane, pure water flux and flux recovery rate of MXene-IL/PVDF mixed matrix membranes increased by 4.37 and 1.83 times, respectively.
研究领域:
材料科学
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环境工程
·
膜技术
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DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Yuhong Cui,Shenghua Xue,Xin Chen,Wei Bai,Shujuan Liu,Qian Ye,Feng Zhou
Herein, the MXene@Cu nanocomposites were prepared via electrostatic adsorption of Cu 2+ and then in-situ reduction. The Cu 2+ is uploaded on the surface of MXene nanosheets via electrostatic adsorption, which was followed by in-situ reduction with NaBH 4 to obtain Cu nanoparticle attached MXene (MXene@Cu) hybrids. The results revealed that the friction coefficient of MXene@Cu decrease from 0.434 to 0.110 and the wear volume loss decreased by 88.1% via changing the loading amount of Cu nanoparticles. The excellent tribological performance of MXene@Cu is attributed to the synergistic effect of MXene nanosheets and Cu nanoparticle , which can adsorb on the surface of friction pair and induce tribochemical reaction. A stable protective film is formed on the worn surface, thereby reducing fiction and wear.
研究领域:
材料科学
·
摩擦学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 193
·期 1
·15
·
IF 5.3
Zhang Yan,Yan Yuting,Huang Yue
An innovative electrochemical biosensor is proposed for the sensitive detection of ofloxacin (OFL) by integrating exonuclease I (Exo I)–assisted recognition-transduction strategy into the MXene/AuNP-enhanced electrochemical platform. Through ingenious design, the presence of OFL triggers the competitive displacement reaction and enables Exo I to hydrolyze the released single-stranded DNA probe containing the sequence of Pb 2+ -DNAzyme, protecting the signal probes on the electrode surface from DNAzyme cleavage, which eventually brings about a remarkable electrochemical signal positively related to the concentration of OFL. MXene/AuNPs with excellent conductivity, large specific surface area, and good chemical stability are employed as the electrode substrate to efficiently accelerate charge transfer and increase the loading capacity for signal probes, leading to the enhancement of signal output and endowing the biosensor with high sensitivity, rapid response, and fine robustness. Taking advantage of OFL recognition–initiated Exo I hydrolysis to DNAzyme, the electrochemical platform with “signal-off/on” mode can detect OFL with good specificity and reduced background interference. Benefiting from the synergistic effect of the involved sensing elements, the developed electrochemical biosensor achieves a low detection limit of 0.47 pg mL −1 with a broad linear range and exhibits satisfactory detection performance in real food samples, indicating potential practical applicability in food safety monitoring. Graphical
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Changhai Li,Guohua Jiang,Tianqi Liu,Zhiyong Zeng,Pengfei Li,Ruofan Wang,Xueya Zhang
The composite electrode materials (rGO/MXene@NiCoO 2 ) have been prepared by tightly wrapping of reduced graphene oxide (rGO) and MXene to NiCoO 2 nanosheets . The specific capacitance of rGO/MXene@NiCoO 2 -5wt% is 1614 F·g −1 at 0.5 A g −1 , maintains at 1257.5 F·g −1 when increasing the current density to 10 A·g −1 . And the capacitance retention is 77.29% even after 10,000 cycles. It is attributed to the special interlayer network structure of the rGO/MXene@NiCoO 2 composite, which promotes more ion intercalation/deintercalation and improves the structure stability. An asymmetric supercapacitor (ASC) is assembled using rGO/MXene@NiCoO 2 as the positive electrode and rGO/MXene as the negative electrode, respectively. The maximum energy density is 45.15 Wh·kg −1 and the power density is 394.52 W·kg −1 . After 10,000 cycles with current density at 5 A·g −1 , the capacity retention rate is 82.69%. These results demonstrate the potential application of rGO/MXene@NiCoO 2 composite networks as electrode materials for supercapacitors.
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yu-yu Yao,Ting Wang,Li-guang Wu,Hua-li Chen
To improve the flux, anti-fouling and dye separation performance of PES-based membranes, PES mixed-matrix membranes (MMMs) blended with ZIF-8@Ti 3 C 2 T x composites were fabricated via a facile one-pot microemulsion strategy. The introduction of hydrophilic components in the microemulsion into the PES matrix enhanced the pore structures and surface polarity of the resulting MMMs, causing them to exhibit high permeation and anti-fouling performance compared to both neat PES and MMMs with ZIF-8. The optimal membrane flux and anti-fouling performance were found to be 280 L·m −2 ·h −1 and 91 % (bovine serum albumin rejection), respectively, at 3 % microemulsion content. The well-distributed ZIF-8@Ti 3 C 2 T x composites in the MMMs interact with dye molecules, which strengthens the dye retention from high-salinity wastewater. Further, the pore size of the MMMs was positively correlated with the flux but negatively correlated with dye retention. In particular, the M-3 membrane exhibited high flux (140 L·m −2 ·h −1 ) and up to 98 % dye rejection in high-salinity wastewater, but its rejection of salt ions was <5 %. In addition, the dye rejection recovery rate of M-3 after each washing exceeded 93 % over 5 fouling/backwashing cycles. These results strongly suggest that MMMs incorporated with ZIF-8@Ti 3 C 2 T x composites have promising application prospects for removing trace dye pollutants from high-salinity wastewater.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-10
·
IF 16.419
Shi Bao,Li La,Chen Aibing,Jen Tien-Chien,Liu Xinying,Shen Guozhen
Highlights
Ti 3 C 2 T x MXene-based coaxial zinc-ion hybrid fiber supercapacitors (FSCs) were fabricated with braided structure, which can be prepared continuously and present excellent flexibility and ultrastability.
A sports watch driven by the watch belts which weaved uses the obtained zinc-ion hybrid FSC and LED arrays lighted by the FSCs under embedding into textiles, demonstrating the great potential application in smart wearable textiles.
Abstract Zinc-ion hybrid fiber supercapacitors (FSCs) are promising energy storages for wearable electronics owing to their high energy density, good flexibility, and weavability. However, it is still a critical challenge to optimize the structure of the designed FSC to improve energy density and realize the continuous fabrication of super-long FSCs. Herein, we propose a braided coaxial zinc-ion hybrid FSC with several meters of Ti 3 C 2 T x MXene cathode as core electrodes, and shell zinc fiber anode was braided on the surface of the Ti 3 C 2 T x MXene fibers across the solid electrolytes. According to the simulated results using ANSYS Maxwell software, the braided structures revealed a higher capacitance compared to the spring-like structures. The resulting FSCs exhibited a high areal capacitance of 214 mF cm –2 , the energy density of 42.8 μWh cm −2 at 5 mV s −1 , and excellent cycling stability with 83.58% capacity retention after 5000 cycles. The coaxial FSC was tied several kinds of knots, proving a shape-controllable fiber energy storage. Furthermore, the knitted FSC showed superior stability and weavability, which can be woven into watch belts or embedded into textiles to power smart watches and LED arrays for a few days.
研究领域:
材料科学
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能源存储技术
·
柔性电子
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chen Zhao,Zengyan Wei,Jie Zhang,Peigang He,Xiaoxiao Huang,Xiaoming Duan,Dechang Jia,Yu Zhou
Commercial graphite anodes show limited capacity in lithium-ion batteries, which inhibits the development of high-energy and high-power devices. Although the theoretical capacity of SnO 2 based anodes is three times higher than that of graphite, their practical application is hindered by the poor cycling stability. In this study, we report a ball-milling assisted exfoliation method for the scalable production of delaminated MXene nanosheets , followed by the preparation of 5 nm SnO 2 nanocrystals anchored on MXene nanosheets through a hydrothermal reaction . SnO 2 /MXenes nanocomposites exhibit long cycling life up to 1000 cycles with a high capacity of 904 mA h g −1 , which can be ascribed to the high conductivity of the MXene substrates, and the anchoring effect between SnO 2 nanoparticles and MXene sheets that can prevent crystal aggregation or collapse during cycling.
研究领域:
材料科学
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能源存储
·
纳米技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 28
·16712-16719
·
IF 10.733
Fanfan Liu,Yongchang Liu,Xudong Zhao,Xiaobin Liu,Li-Zhen Fan
In this paper, we report on the fabrication of MXenes sandwiched by carbon nanospheres (MXenes@C) and their application as an electrode for magnesium-ion storage. The heterostructure synthesis is realized via electrostatic interactions between negatively charged 2D MXene nanosheets and positively charged 3D carbon nanospheres. This approach effectively opens up the interlayer and prevents the restacking of MXene nanosheets, thus promoting the electrolyte transport and shortening the ion diffusion path. Through ex situ X-ray diffraction characterization and density functional theory computations, the magnesiation/demagnesiation mechanism and Mg-migration kinetics of the tailored Ti3C2Tx@C nanospheres are elucidated. Using Ti3C2Tx@C as a cathode for magnesium-ion batteries, a remarkable reversible specific capacity (198.7 mA h g−1 at 10 mA g−1), outstanding rate capability (123.3 mA h g−1 at 200 mA g−1), and impressive cycling stability (∼85% capacity retention after 400 cycles) are achieved. This method can also be applied to other MXenes, such as V2CTx, to prepare a sandwich-structure with nice rate performance and cycle life. The synthesis of MXene@C nanospheres using a simple self-assembly method offers new and feasible avenues to develop promising Mg-storage materials with excellent capacity and long cycle life.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机非金属材料
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhiquan He,Yuhang Wang,Yan Li,Junjie Ma,Yimeng Song,Xiaoxu Wang,Fengping Wang
Two-dimensional (2D) MXene materials have significant potential applications in electrochemical energy storage. A Ti 3 C 2 T x MXene film can be used as a high-performance electrode for a flexible supercapacitor owing to its flexibility and excellent rate capability. However, Ti 3 C 2 T x is usually only used as a negative electrode material because it can be easily oxidized under positive (anodic) potential. Herein, we report a simple filtration method to fabricate a hybrid cathode by mixing a colloidal solution of 2D Ti 3 C 2 T x nanosheets and 1D MnO 2 nanobelts to form an alternating MnO 2 /Ti 3 C 2 T x stacked structure. Compared with pure Ti 3 C 2 T x , the hybrid cathode has higher electrochemical stability toward anodic oxidation. The MnO 2 /Ti 3 C 2 T x hybrid cathode delivers a high gravimetric capacitance of 315 F g −1 at 10 mV s −1 and a good rate capability of 166 F g −1 at 100 mV s −1 . The high stability of the MnO 2 /Ti 3 C 2 T x hybrid cathode is mainly attributed to the charge transfer-induced work function enlargement at the Ti 3 C 2 T x and MnO 2 heterointerface. Furthermore, a flexible asymmetric supercapacitor assembled using MnO 2 /Ti 3 C 2 T x as the cathode and alkalized Ti 3 C 2 T x as the anode delivers a high-voltage window up to 1.9 V. This work provides new insights for designing high-performance MXene-based cathode materials and devices for wearable electronics.
研究领域:
材料科学
·
电化学储能
·
柔性电子
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Xingmin Liu,Boxiong Zheng,Yutuo Hua,Shaowei Lu,Zhisheng Nong,Jijie Wang,Yutong Song
Highly conductive MXene has attracted extensive focus owing to its notable ability for electromagnetic wave dissipation, but it also suffers from impedance mismatch. Herein, flexibly MXene/rGO aerogel frames (MGs) were construct by direct ink writing (DIW) of low concentration emulsion inks. Adjustment of compositional ratio and structural design could effectively regulate their EWA performances. The results indicate that the printed aerogel frame has an effective absorption bandwidth (EAB) of 8.10 GHz (covering the majority of X-band and entire Ku-band) and a minimum reflection loss (RL min ) of −56.85 dB. In addition, the printed ultralight aerogel frames integrate good mechanical performance and thermal insulation capability. The DIW technique for ultralight MXene-based absorber reveals beneficial inspiration and enlightenment for the structural design and potential application of EMA composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Zhe Zou,Mingqiang Ning,Zhenkuang Lei,Xueheng Zhuang,Guoguo Tan,Jianhua Hou,Hui Xu,Qikui Man,Jingbo Li,Run-Wei Li
Ti 3 C 2 T x is considered a candidate for high-efficiency microwave absorption materials due to its adjustable electrical conductivity , low density and high specific surface area in recent years. However, the single absorption mechanism could not meet the practical requirements as the functional microwave absorbers. Herein, 0D/1D/2D architectures of Co@C/MXene with 0D Co nanoparticles , 1D carbon nanotubes (CNTs) and 2D Ti 3 C 2 T x MXene nanosheets were rationally fabricated to enhance the microwave attenuation performance, in which Co@CNTs were in situ grown on Ti 3 C 2 T x MXene nanosheets . By changing the amount of Ti 3 C 2 T x MXene to optimize the impedance matching properties, the Co@C/M − 10 absorber exhibits excellent microwave attenuation performance with a minimum reflection loss of −50.5 dB at 5.9 GHz under a thickness of 4.0 mm. Meanwhile, the maximum effective absorption bandwidth (<−10 dB) of Co@C/M − 10 absorber can reach 5.8 GHz under 2.0 mm. The remarkable absorption performance can be ascribed to the synergistic effects of interface polarizations and magnetic loss. Moreover, the radar cross section (RCS) simulation was also performed via CST. Under the incident angle of 0°, the RCS reduction value of Co@C/M − 10 can reach 33.5 dBm 2 . This work provides a strategy for synthesizing MXene-based composite materials with tunable electromagnetic attenuation and wide absorption bandwidth performance .
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）