CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 4
·694-698
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IF 1.063
Li La,Chen Di,Shen Guozhen
Flexible on-chip microsupercapacitors(MSCs) are highly desired for integrated wearable or portable electronics due to their advantages of small size, high power density, easy integration, long lifespan, high security, and flexibility. The output voltage of MSCs can be improved by designing MSC arrays, which could further expand their application fields. In this work, we proposed a facile laser direct cutting method to prepare an on-chip flexible MSC array using Ti 3 C 2 T x MXene as both current collector and electrode materials. The designed MSC in PVA/H 2 SO 4 all-solid-state gel electrolyte exhibits a large volume/areal capacitance of 770.72 F/cm 3 (46.24 mF/cm 2 ) at a scan rate of 20 mV/s, a high energy density of 68.51 mW·h/cm 3 at a power density of 6.16 W/cm 3 , excellent cycling stability with capacitance retention of 98.50% after 10000 charge/discharge cycles. The MSC also shows superior flexibility and stability even after repetition of charge/discharge cycles under the convex and concave bending states. In addition, the assembled MSC array(4 in series) provides a high voltage of 3.2 V, which could easily power a purple light-emitting diode more than 10 min, demonstrating its potential application in integrated portable/wearable devices.
研究领域:
材料科学
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能源存储
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纳米技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Guan Sheng,Yudong Jiang,Zirong Yan,Jinshu Tian,Shaobo Tu
MXenes represent exceptionally promising electrocatalytic materials for ammonia synthesis, owing to their outstanding electrical conductivity, modifiable surface functional groups, exceptional hydrophilicity, high specific surface area, and electronegative surface characteristics. In this investigation, we systematically demonstrate that the persistent challenge of Cu and Co nanoparticle agglomeration can be effectively addressed through the in-situ growth of bimetallic CuCo nanoparticles on Ti 3 C 2 T x MXene nanosheets. This innovative approach significantly enlarges the electrochemically active surface area, maximizes the exposure of catalytically active sites, and optimizes mass transport properties, consequently leading to substantially enhanced electrocatalytic performance for ammonia synthesis. Among the series of Cu x Co y /MXene composites developed, the Cu 2 Co 1 /MXene hybrid catalyst demonstrates superior nitrate reduction reaction (NO 3 RR) activity, achieving remarkable performance metrics including: An exceptional ammonia yield rate of 2.73 mg cm −2 h −1 at an applied potential of −0.85 V versus RHE, a high Faradaic efficiency of 72.05 %, and outstanding selectivity reaching 90.6 %. These breakthrough results establish new benchmarks for MXene-based electrocatalysts in sustainable ammonia production.
研究领域:
材料科学
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电化学
·
催化
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纳米技术
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 6
·1330
·
IF 5
Kun Hou,Yafeng Yang,Hu Zhou,Xiangmeng Chen,Shengbo Ge
Water pollution has spurred the development of membrane separation technology as a potential means of solving the issue. In contrast to the irregular and asymmetric holes that are easily made during the fabrication of organic polymer membranes, forming regular transport channels is essential. This necessitates the use of large-size, two-dimensional materials that can enhance membrane separation performance. However, some limitations regarding yield are associated with preparing large-sized MXene polymer-based nanosheets, which restrict their large-scale application. Here, we propose a combination of wet etching and cyclic ultrasonic-centrifugal separation to meet the needs of the large-scale production of MXene polymers nanosheets. It was found that the yield of large-sized Ti3C2TxMXene polymers nanosheets reached 71.37%, which was 2.14 times and 1.77 times higher than that prepared with continuous ultrasonication for 10 min and 60 min, respectively. The size of the Ti3C2TxMXene polymers nanosheets was maintained at the micron level with the help of the cyclic ultrasonic-centrifugal separation technology. In addition, certain advantages of water purification were evident due to the possibility of attaining the pure water flux of 36.5 kg m−2h−1bar−1for the Ti3C2TxMXene membrane prepared with cyclic ultrasonic-centrifugal separation. This simple method provided a convenient way for the scale-up production of Ti3C2TxMXene polymers nanosheets.Keywords:Ti3C2TxMXene;yield;polymers nanosheets;cyclic ultrasonic-centrifugal separation
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 13
·4243
·
IF 4.927
Weisong Zhao,Hong Chi,Shiyun Zhang,Xue Zhang,Tianduo Li
Ti3C2TxMXene has attracted considerable interest as a new emerging two-dimensional material for environmental remediation due to its high adsorption capacity. However, its use is greatly limited by its poor mechanical properties, low processability and recyclability, and the low dispersity of such powder materials. In this work, a porous adsorbent (C–CMP) containing cellulose nanocrystals (CNC), Ti3C2TxMXene and polyvinyl alcohol (PVA) was prepared by a simple and environmentally-friendly foaming method. Glutaraldehyde was used as crosslinker to improve the mechanical properties and boost the adsorption efficiency of methylene blue (MB) molecules. Fourier transform infrared (FT–IR), elemental analysis (EDX) and thermogravimetric analysis (TGA) further confirmed that the preparation of the C–CMP foam and cross-linking reaction were successful. Scanning electron microscope (SEM) indicated that the macropores were distributed homogeneously. The adsorption experiment showed that maximum adsorption capacity of MB can reach 239.92 mg·g−1which was much higher than anionic dye (methyl orange, 45.25 mg·g−1). The adsorption behavior fitted well with the Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. Based on FT–IR, EDX and X-ray photoelectron spectroscopy (XPS) analysis, the adsorption mechanism between C–CMP and MB molecules was attributed to electrostatic interaction.Keywords:foam;Ti3C2TxMXene;polyvinyl alcohol;cellulose nanocrystals;methylene blue;adsorption
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Crystals
·
2023
·Vol. 13
·期 8
·1234
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IF 2.7
Zhiwei Liu,Zhaobo Liu,Guanlong Li,Yan Zhao,Kai Wang,Xiangbao Chen
At present, the rapid development of electronic devices such as batteries, sensors, capacitors and so on is creating a huge demand for lightweight materials with a designed structure and function. Ti3C2TxMXene, a lightweight two-dimensional (2D) nanomaterial with excellent electronic properties, has been favored in this field. In this work, Ti3C2TxMXene was annealed under an inert gas (N2, Ar and CO2) atmosphere to design the crystal structure and interface of the nanosheets, and then the modified nanosheets with specific changes in dielectric properties were obtained. Among them, the key temperature points (100 °C, 300 °C, 500 °C and 800 °C) in the thermogravimetric (TG) test under an air atmosphere were used as the annealing temperature. When annealing under an air atmosphere, with the increase in temperature, the Ti layer gradually oxidized and evaporated, and the original two-dimensional structure was partly destroyed with some of the C atoms reacting with O2to form CO2. In the inert gas atmosphere, however, the 2D structure is preserved, except that the surface end groups and layer spacing are changed. In addition, some N element doping was introduced into the nanosheets after N2atmosphere treatment, which changed the original lattice structure. After the Ar atmosphere treatment, some Ti atoms on the surface were oxidized in situ to form TiO2grains with different crystal forms, which increased the interfacial area. The C-TiO2structure of the nanosheets was more complete after treatment with the CO2atmosphere. All the nanosheets after heat treatment with an inert gas atmosphere retained the characteristic morphology of 2D materials, and different changes in the micro-structure caused changes in dielectric properties, thereby meeting the needs of 2D nanomaterials Ti3C2TxMXene in different scenarios.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 24
·3135
·
IF 5.3
Yanqi Li,Xianhe Huang,Qiao Chen,Yao Yao,Wei Pan
MXenes, as a typical graphene-like material, excels in the realm of humidity sensing owing to its two-dimensional layer structure, high electrical conductivity, tunable chemical properties, hydrophilicity, and large specific surface area. This study proposed a quartz crystal microbalance (QCM) humidity sensor using a nanochitin/Ti3C2TxMXene composite as a humidity-sensing material. The morphology, nanostructure, and elemental composition of nanochitin, Ti3C2TxMXene, and nanochitin/Ti3C2TxMXene composite materials were characterized using transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Compared to the pure Ti3C2TxMXene-coated QCM humidity sensor, the nanochitin/Ti3C2TxMXene-coated QCM humidity sensor exhibited a higher sensitivity (20.54 Hz/%RH) in the humidity range of 11.3% to 97.3%. The nanochitin/Ti3C2TxMxene-coated QCM humidity sensor also demonstrated low humidity hysteresis (2.12%RH), very fast response/recovery times (4.4/4.1 s), a high quality factor (37 k), and excellent repeatability and sustained stability over time. Eventually, a bimodal exponential kinetics adsorption model was utilized for the analysis of the response mechanism of the nanochitin/Ti3C2TxMXene composite material-based QCM humidity sensor. This study provides new ideas for optimizing the moisture-sensitive performance of MXene-based QCM humidity sensors.Keywords:humidity sensor;quartz crystal microbalance (QCM);nanochitin;Ti3C2TxMXene;high quality factor
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Miaomiao Zhang,Chen Du,Shixin Xu,Jinxin Zhang,Junbo Jiang,Zhiyi Gao,Jierui Li,Bo Li,Li Xie,Wen Zhao
Current research primarily focuses on the effects of conductive fibrous membranes mediated electrical stimulation (ES) on stem cell behaviors. The role and mechanism of conductive fibrous membranes-mediated ES in regulating the paracrine function of adipose-derived stem cells (ADSCs) for tissue repair remain unexplored. This study aims to investigate the impact of ES mediated by poly (ε-caprolactone)/gelatin/Ti 3 C 2 T x MXene (PGM) fibrous membranes on the paracrine function of ADSCs. Our findings demonstrated that ES mediated by PGM fibrous membranes promoted the adhesion, spreading, proliferation, and migration of ADSCs. Furthermore, ES significantly enhanced the secretion of immunomodulatory and angiogenesis-related genes ( e.g. , hepatocyte growth factor (HGF) and transforming growth factor-β (TGF-β) and proteins ( e.g. , HGF and TGF-β) in the paracrine of ADSCs. Notably, the PGM@ES-CM group exhibited the highest secretion levels of factors promoting macrophage polarization and pro-angiogenic activity, with these secreted factors demonstrating functional efficacy in vitro assays and therapeutic potential in a full-thickness skin defect model. Mechanistically, the focal adhesion kinase (FAK)/extracellular-signal-regulated kinase (ERK) signaling pathway has been identified as a key regulatory pathway underlying ES-mediated modulation of paracrine function. Furthermore, an increase in intracellular Ca 2+ concentration, which mediated the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT) signaling pathway, serves as another critical regulatory mechanism in the ES-mediated modulation of paracrine function. This study provides novel insights into developing advanced wound dressings that leverage biomaterial-mediated electrical signaling to orchestrate stem cell paracrine activity for tissue regeneration.
研究领域:
生物医学工程
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组织工程
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再生医学
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干细胞生物学
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生物材料
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伤口愈合
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信号转导
✓ 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）