Cell Reports Physical Science
·
2023
·
IF 8.9
Qinan Wang,Sixuan Duan,Jiahao Qin,Yi Sun,Shihang Wei,Pengfei Song,Wen Liu,Jiangmin Gu,Li Yang,Xin Tu,Hao Gao,Chun Zhao
Dynamic deep learning is considered to simulate the nonlinear memory process of the human brain during long-term potentiation and long-term depression. Here, we propose a photoelectrically modulated synaptic transistor based on MXenes that adjusts the nonlinearity and asymmetry by mixing controllable pulses. According to the advantage of residual deep learning, the rule of dynamic learning is thus elaborately developed to improve the accuracy of a highly homologous database (colorimetric enzyme-linked immunosorbent assay [c-ELISA]) from 80.9% to 87.2% and realize the fast convergence. Besides, mixed stimulation also remarkably shortens the iterative update time to 11.6 s as a result of the photoelectric effect accelerating the relaxation of ion migration. Finally, we extend the dynamic learning strategy to long short-term memory (LSTM) and standard datasets (Cifar10 and Cifar100), which well proves the strong robustness of dynamic learning. This work paves the way toward potential synaptic bionic retina for computer-aided detection in immunology.
研究领域:
神经网络
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2025
·Vol. 37
·期 9
·e70046
·
IF 2.3
Wei Liu,Yanhua Sun,Songfeng Yin,Hao Li,Miao Yang,Pingping Huang,Zi Li,Nannan Wang,Deming Li
In this study, carbon nitride-multiwalled carbon nanotubes/ MXenes (CN-MWCNTs/Ti 3 C 2 ) nanocomposites with excellent properties were synthesized by a convenient method and characterized using various methods. By modifying the CN-MWCNTs/Ti 3 C 2 composites on glassy carbon electrode, an electrochemical sensor capable of sensitive and rapid detection of hesperidin (HPD) was established. Under the optimal conditions, the sensor showed excellent detection performance for HPD (0.1 M PBS (pH 7.0)). The linear range was 0.05–503 μM, and the detection limit (S/N = 3) was 0.017 μM. In addition, the sensor has the advantages of good immunity to interference, stability and reproducibility.
研究领域:
分析化学
·
纳米生物技术
·
电化学传感
·
药物分析
·
天然产物检测
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 19
·3902
·
IF 5
Jianyang Shi,Shuang Wang,Haibo Wang,Jun Gu
Hydrogels with flexible and stretchable properties are ideal for applications in wearable sensors. However, traditional hydrogel-based sensors suffer from high brittleness and low electrical sensitivity. In this case, to solve this dilemma, a macromolecular polyurethane crosslinking agent (PCA) was designed and prepared; after that, PCA and two-dimensional (2D) MXene nanosheets were both introduced into a covalently crosslinked network to enhance the comprehensive mechanical and electrochemical properties of the hydrogels. The macromolecular polyurethane crosslinking agent promotes high-tensile strength and highly stretchable capacity by suitable covalent crosslinking. The optimized hydrogel, which exhibited maximum tensile strength and maximum elongation at break, had results of 1.21 MPa and 644%, respectively. Two-dimensional MXene nanosheets provide hydrogel with high electrical conductivity and strain sensitivity, producing a wearable device for the continuous monitoring of human movements and facial microexpressions. This study demonstrated an efficient structure design strategy for building mechanically tough, highly stretchable, and sensitive dual-mode MXenes-based wearable sensors.Keywords:strain sensor;mechanical tough;highly stretchable;sensitive;MXenes;macromolecular crosslinking agent
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Haizhen Liu,Chenglin Lu,Xinchun Wang,Li Xu,Xiantun Huang,Xinhua Wang,Hua Ning,Zhiqiang Lan,Jin Guo
Two-dimensional vanadium carbide (V2C) and titanium carbide (Ti3C2) MXenes were first synthesized by exfoliating V2AlC or Ti3AlC2 and then introduced jointly into magnesium hydride (MgH2) to tailor the hydrogen desorption/absorption performances of MgH2. The as-prepared MgH2–V2C–Ti3C2 composites show much better hydrogen storage performances than pure MgH2. MgH2 with addition of 10 wt % of 2V2C/Ti3C2 initiates hydrogen desorption at around 180 °C; 5.1 wt % of hydrogen was desorbed within 60 min at 225 °C, while 5.8 wt % was desorbed within 2 min at 300 °C. Under 6 MPa H2, the dehydrided MgH2–2V2C/Ti3C2 can start to recover hydrogen at room temperature, and 5.1 wt % of H2 is obtained within 20 s at a constant temperature of 40 °C. The reversible capacity (6.3 wt %) does not decline for up to 10 cycles, which shows excellent cycling stability. The addition of 2V2C/Ti3C2 can remarkably lower the activation energy for the hydrogen desorption reaction of MgH2 by 37% and slightly reduce the hydrogen desorption reaction enthalpy by 2 kJ mol–1 H2. It was demonstrated that the combination of V2C and Ti3C2 promotes the hydrogen-releasing process of MgH2 compared with addition of only V2C or Ti3C2, while Ti3C2 impacts MgH2 more significantly than V2C in the hydrogen absorption process of MgH2 at ambient temperatures. A possible mechanism in the hydrogen release and uptake of the MgH2–V2C–Ti3C2 system was proposed as follows: hydrogen atoms or molecules may preferentially transfer through the MgH2/V2C/Ti3C2 triple-grain boundaries during the desorption process and through the Mg/Ti3C2 interfaces during the absorption process. Microstructure studies indicated that V2C and Ti3C2 mainly act as efficient catalysts for MgH2. This work provides an insight into the hydrogen storage behaviors and mechanisms of MgH2 boosted by a combination of two MXenes.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 16
·8020-8027
·
IF 5.8
Qin Zhao,Yue Zhang,Changwang Ke,Weilin Yang,Jianshu Yue,Xiaofei Yang,Weiping Xiao
The improvement of the hydrogen evolution reaction (HER) performance of nanomaterials is associated with the interfacial synergistic interaction and their hydrogen adsorption kinetics. Nevertheless, it is still a challenge to accelerate the proton transfer and optimize the HER kinetics by constructing Pt-supported heterostructures based on the hydrogen spillover phenomenon. Herein, oxygen vacancies on the surface of MXene nanosheets were constructed via a high-temperature annealing method, which was employed to anchor/stabilize Pt nanoparticles and fabricate a Pt/MXene heterostructure. EPR and XPS analyses verified the presence of oxygen vacancies, which could enhance the intrinsic HER activity of the MXene. The HER catalytic performance was investigated by taking into account the surface structure of the MXene affected by the annealing temperature, the concentration of Pt and the number of deposition cycles. Electrochemical results showed that Pt/MXene with higher utilization of Pt was obtained at 900 °C and 0.05 mgPt mL−1. The 0.05-Pt/MXene-900 obtained at deposition of 60 cycles in 0.5 M H2SO4 solution exhibited the optimized HER activity. The overpotential was 22 mV at a current density of 10 mA cm−2 and the Tafel slope was 42.41 mV dec−1. Furthermore, the accelerated HER kinetics was mainly due to the electron trapping ability of the MXene, small particles of Pt, as well as the enhanced charge transfer between the oxygen vacancies of the MXene and Pt. This strategy for constructing Pt-supported heterostructures based on the vacancy anchoring effects provides new ideas for the design of well-defined electrocatalysts toward the HER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Guiying Tian,Shuxiao Yan,Runye Mao,Yuze Cui,Mengyue Tian,Denghui Yang,Penggao Cheng,Jianping Zhang,Jun Xiang,Na Tang
Concerns regarding the raw cost and energy density of lithium-ion batteries have sparked significant interest in LiMn₁₋ ₓ Fe ₓ PO₄ (LMFP) cathodes. However, their poor electronic conductivity with low Li + diffusion coefficient hinders the practical application. In this study, a LMFP/C@MXene heterostructured cathode with dual coating modification with amorphous sucrose and conductive Ti₃C₂T x is prepared via solid-state method with stepwise heating. Electrochemical tests demonstrate that the optimal LMFP/C@MXene cathode retains a reversible capacity of 120 mA h g −1 after 100 cycles at 1C rate. Also, and it maintains a capacity retention rate at 5C rate as high as 91.26% after 600 cycles, which is significantly superior to the unmodified LMFP material (87.7%). Thus, the composite LMFP/C@MXene material achieves the synergistic improvement of rate performance and cycling stability by constructing conductive paths for charge transport with rapid diffusion kinetics. It also buffers volume deformation of cathode electrolyte interphase (CEI) by adding crown ether in the electrolyte, thus inhibitig surficial Mn dissolution for the robust protection of the crystalline LMFP grains.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fanfan Liu,Aiguo Zhou,Jinfeng Chen,Jin Jia,Weijia Zhou,Libo Wang,Qianku Hu
Here we reported the preparation of Ti 3 C 2 MXene and Ti 2 C MXene by etching Ti 3 AlC 2 and Ti 2 AlC with various fluoride salts in hydrochloric acid (HCl), including lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), and ammonium fluoride (NH 4 F). As-prepared Ti 2 C was further delaminated by urea, dimethylsulfoxide or ammonium hydroxide. Based on theoretical calculation and XPS results, the type of positive ions (Li + , Na + , K + , or NH 4 + ) in etchant solution affect the surface structure of prepared MXene, which, in turn, affects the methane adsorption properties of MXene. The highest methane adsorption capacity is 8.5 cm 3 /g for Ti 3 C 2 and 11.6 cm 3 /g for Ti 2 C. MXenes made from LiF and NH 4 F can absorb methane under high pressure and can keep methane under normal pressure, these MXenes may have important application on capturing methane or other hazardous gas molecules. MXenes made from NaF and KF can absorb methane under high pressure and release methane under low pressure. They can have important application in the adsorb storage of nature gas.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·
IF 13.3
Hao Liu,Biao-Qi Chen,Chang-Yong Li,Cun-Jiong Fang,Ranjith Kumar Kankala,Shi-Bin Wang,Ai-Zheng Chen
2D MXene-Ti 3 C 2 T x holds great promise in various electronic applications, especially for electromagnetic interference (EMI) shielding devices and supercapacitors. Ti 3 C 2 T x synthesis typically involves the use of hazardous fluorine-containing chemicals that can result in the formation of inert fluoride functional groups on the surface of Ti 3 C 2 T x , severely degrading its properties and posing a threat to the performance of electron transfer among electrical devices. Herein, a supercritical carbon dioxide-based ternary solution (scCO 2 /DMSO/HCl) to produce fluoride-free Ti 3 C 2 T x in mild conditions (via 0.5 m HCl, 20 MPa, 32 °C) is reported. The fluorine-free Ti 3 C 2 T x films electrode presents an excellent gravimetric capacitance of 320 F g −1 at 2 mV s −1 in 1 m H 2 SO 4 . Besides, it is demonstrated that fluorine-free Ti 3 C 2 T x films exhibit outstanding EMI shielding efficiency of 53.12 dB at 2.5 µm thickness. The findings offer a mild and practical approach to producing fluoride-free Ti 3 C 2 T x and open opportunities for exploring MXenes’ potential applications in various fields.
研究领域:
材料科学
·
电子工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 49
·34808-34816
·
IF 3.9
Zishan Hu,Yuanlin Li,Aijun Li,Hai-Hua Wang,Xiao-Feng Wang
Establishing stable and efficient Pt-free counter electrodes (CEs) is an important challenge for dye-sensitized solar cells (DSSCs). Ti3C2Tx MXene, with its high catalytic activity and conductivity, has gained attention as a CE in DSSCs. The focus of this paper is on the preparation of Ti3C2Tx decorated carbon nanotubes (CNTs) composite electrode materials (CNTs/Ti3C2Tx), and testing their performance as CEs in DSSCs. Through a series of electrochemical tests, a CNTs/Ti3C2Tx CE exhibits good electrocatalytic activity toward iodine-based electrolytes with low charge transfer resistance, which is close to the performance of a Pt CE. The photoelectric conversion efficiency (PCE) of the CNTs/Ti3C2Tx (1.0 wt%) CE-based DSSCs reaches 5.83%, which is much higher than that of the CNTs CE (3.70%), and approximates that of the Pt CE (6.61%). We attribute the improved performance to the synergistic effect of the excellent conductivity and unique two-dimensional chemical structure of Ti3C2Tx MXene. Moreover, the photostability test of continuous light exposure shows that the CNTs/Ti3C2Tx-1.0 wt% (C/T-1.0 wt%) CE exhibits good stability to the electrolyte. Therefore, CNTs/Ti3C2Tx composites can be used as an efficient Pt-free CE for DSSCs in the future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xiao-Rui Wang,Wen-Jie Shi,Ai-Jun Jiao,Zhen-Hai Fu,Min-Peng Li,Hong-Yan Li,Cai-Xia Zheng,Yu-Xia Hu,Hong-Tao Xue,Mao-Cheng Liu
MXenes is considered as one of the most potential sodium ions storage materials due to its superior metallic conductivity, abundant surface functional groups, extensive specific surface area, and tunable interlayer spacing. Nevertheless, its practical application is hindered by severe volumetric expansion/shrinkage and slow sodium ions diffusion during sodium ions insertion/extraction process. Herein, a novel organic acid molecules bridging strategy is reported to stabilize layered structure and adjust the interlayer spacing of Ti 3 CN, which is realized by bridging organic acid molecules (named as TOAA) into Ti 3 CN interlayers (named as Ti 3 CN-TOAA) to form strong amido (HN C=O) bonds. The carbonyl groups of TOAA molecules can not only provide active sites for sodium ions storage, but also inhibit volumetric expansion/shrinkage by providing strain/pillar effects within the Ti 3 CN interlayers, achieving stable and rapid sodium ions storage. Consequently, the interlayer spacing of Ti 3 CN-TOAA (1.42 nm) is enlargered compared with that of Ti 3 CN (1.22 nm), while the sodium ions migration barrier of Ti 3 CN-TOAA is reduced by 0.09 eV Ti 3 CN-TOAA demonstrates superior cycling stability (the capacity retention remains at 83.2% after 2000 cycles at 0.5 A g -1 ) and rate capability (2.5 times the capacity of pristine Ti 3 CN at 5.0 A g -1 ). Significantly, the Ti 3 CN-TOAA||AC sodium ions capacitor (SIC) exhibits excellent cycling stability, retaining 79.3% of its capacity after 8000 cycles at 1.0 A g -1 . This work presents a novel approach to achieving stable and rapid sodium ions storage by stabilizing layered structure and adjusting interlayer spacing.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2019
·Vol. 62
·期 7
·1202-1209
·
IF 2.18
Xie XiaoJing,Zhu YuMei,Li Fang,Zhou XiaoWei,Xue Tao
During the preparation of MXenes, the control of the amounts of metal atoms and functional groups has a great influence on the properties of Surface Enhancement Raman Scattering (SERS) substrate materials. A freestanding Ti 3 C 2 T x membrane with good uniformity was prepared by HF etching of Ti 3 AlC 2 . The effect of etching time on the removal of Al atoms and the functional groups bonded to Ti 3 C 2 was precisely characterized by XRD. In addition, by using Ti 3 C 2 T x as the SERS substrate, a quadratic relationship between the enhancement intensity and concentration of the dye molecule rhodamine was achieved.
研究领域:
材料科学
·
纳米技术
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 8
·3414-3422
·
IF 2.7
Di Wang,Deyang Zhang,Binhe Feng,Jinbing Cheng,Zuxue Bai,Zhaorui Wang,Jin Chang,Paul K. Chu,Yang Lu,Yongsong Luo
MXenes have gained significant recognition due to their outstanding electrical conductivity, abundant surface functional groups, and distinctive two-dimensional layered structure. However, restacking of nanoflakes hinders the electrochemical performance of Ti3C2Tx-based supercapacitors. Herein, a Ti3C2Tx/VN composite is fabricated using a one-step in situ nitriding method. The presence of VN within the Ti3C2Tx nanoflakes results in an increased interlayer spacing, providing additional electrochemically active sites for charge storage. In addition, the Ti3C2Tx nanosheets form a continuous metallic skeleton that suppresses the formation of soluble salts from VN during charging and discharging resulting in better cycling stability. As the negative electrode in supercapacitors, Ti3C2Tx/VN demonstrates an outstanding specific capacity of 382.1 F g−1 at a current density of 1 A g−1 and exceptional cycling endurance, retaining 93.5% of its capacity after 5000 cycles. An asymmetric supercapacitor comprising Co3O4 and Ti3C2Tx/VN as the positive and negative electrodes, respectively, shows high energy and power densities of 69.1 W h kg−1 (1 A g−1) and 7.6 kW kg−1 (8 A g−1). The results reveal a promising strategy to design composite anodes with high energy and power densities for supercapacitors.
研究领域:
材料科学
·
电化学
✓ 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）