ACS Applied Nano Materials
·
2023
·
IF 5.9
Sen Jin,Huijuan Jing,Libo Wang,Qianku Hu,Aiguo Zhou
Mo2C MXene is a two-dimensional material, which can be applied as a co-catalyst to significantly enhance the photocatalytic performance of CdS for H2 production. To understand the effect of the synthesis process of Mo2C MXene nanosheets on the catalytic performance, in this paper, Mo2C MXene was made from Mo2Ga2C by hydrothermal etching in different etchants. Diverse cations (Li+, Na+, K+, or NH4+) in etchants resided on the surface of Mo2C MXene nanosheets. Then, the samples were used to construct CdS/Mo2C-MXene composites for photocatalytic H2 evolution. Among them, Mo2C MXene with Li+ shows the best photocatalytic H2 production rate of 22,048 μmol g–1 h–1 under visible light. The remarkable performance arises from the modification at the nanoscale of Mo2C MXene with Li+, thereby resulting in better photoabsorption behavior, high separation efficiency of photogenerated carriers, and fast charge transfer at the heterointerface. Moreover, the energy band structures explain that the changes of band gap and the position of the conductive band in the photocatalyst tuned by cations are also key to affect photocatalytic activities.
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Nano Energy
·
2023
·
IF 17.6
Yixin Cao,Tianshi Zhao,Chenguang Liu,Chun Zhao,Hao Gao,Shichen Huang,Xianyao Li,Chengbo Wang,Yina Liu,Eng Gee Lim,Zhen Wen
Artificial synapses with light signal perception capability offer the ability to neuromorphic visual signal processing system on demand. In light of the excellent optical and electrical characteristics , the low-dimensional materials have become one of the most favorable candidates of the key component for optoelectronic artificial synapses. Previously, our group originally proposed the synthesis of germanium oxide-coated MXene nanosheets . In this work, we further applied this technology into the optoelectronic synaptic thin-film transistors for the first time. The devices exhibited the adjustable postsynaptic current behaviors under the visible light inputs. Moreover, the potentiation and depression operation modes of the devices further improved the application potential of the devices in mimicking biological synapses. Regulated by the wavelength of incident lights, the proposed artificial synapse could effectively help detect the target area of the image. Eventually, we further showed the results of the devices in the projects of neural network computing task. The long-term potentiation/depression characteristics of the conductance were applied to the synaptic weight matrix for image identification and path recognition tasks. By adding knowledge transfer in the process of recognition, the epoch required for convergence has been greatly reduced. The result of high noise tolerance revealed the great potential of the proposed transistors in establishing high-efficiency and robustness hardware neuromorphic systems for in-memory computing.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Rongting Guo,Wei Li,Ruiqin Huang,Mengqi Chen,Zheng Liu,Guo-Cheng Han
Herein, sandwich-like Ti 3 C 2 T x MXene/SnO 2 quantum dots composites were synthesized as sulfur host, aiming to alleviate the shuttle effect of polysulfides present in lithium-sulfur batteries. SnO 2 quantum dots (SnO 2 QDs) were introduced into the interlayer of MXene through a simple electrostatic self-assembly method, and the mass fraction of SnO 2 QDs was controlled to construct sandwich MXene/SnO 2 QDs. While SnO 2 QDs effectively alleviating the stacking tendency of MXene, Ti and Sn co-chemisorb polysulfides and the interlayer structure physically confines polysulfides. Significantly, the synergistic effect between MXene with SnO 2 QDs effectively alleviates the shuttle effect of polysulfides and buffers the volume expansion. Meanwhile, with the help of the catalysis of SnO 2 QDs, the liquid-solid reaction kinetics of lithium polysulfides converting to Li 2 S 2 /Li 2 S is accelerated. Electrochemical test results showed that the MXene/SnO 2 QDs/S cathode has a high initial discharge specific capacity (1147.6 mAh g −1 at 0.1 C, while MXene/S is only 615.4 mAh g −1 ), as well as excellent rate performance and cycling stability in Li-S batteries.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Di Zhang,Lijie Liu,Bing Zhao,Xiangxue Wang,Hongwei Pang,Shujun Yu
Uranium mainly exists in the form of uranyl carbonate in seawater. [UO 2 (CO 3 ) 3 ] 4- has strong stability, which increases the difficulty of uranium extraction from seawater. Meanwhile, the complex marine environment, a large number of coexisting competing ions and biological pollution are all non-negligible disturbing factors. Herein, we introduced amidoxime (AO) groups into the surface of Ti 3 C 2 and grafted polyamides (PA) by a simple one-step hydrothermal method to produce an efficient seawater uranium extraction adsorbent Ti 3 C 2 -AO-PA. Owing to the amidoxime groups, the material was highly selective for uranium. And the large number of amino groups in the polyamides gave it ideal resistance to biofouling. The possibility of Ti 3 C 2 -AO-PA as an adsorbent for uranium extraction from seawater was confirmed by various characterization techniques, numerous adsorption batch experiments, simulated seawater experiments and antibacterial performance tests. It was demonstrated that the uptake of [UO 2 (CO 3 ) 3 ] 4- by Ti 3 C 2 -AO-PA showed fast reaction kinetics (about 120 min), brilliant absorption capacity (81.1 mg·g −1 at pH 8.3), significant high selectivity (32.8 mg-U/g-Ads) and outstanding anti-biological contamination performance (92.9% antibacterial rate). XPS and DFT further indicated that the high extraction ability of Ti 3 C 2 -AO-PA for uranium was mainly attributed to the strong complexation of AO and –NH 2 with [UO 2 (CO 3 ) 3 ] 4- . These conclusions showed that Ti 3 C 2 -AO-PA not only had an ideal application prospect for uranium extraction from seawater, but also provided an available strategy for rapid and selective uranium adsorption from real seawater.
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PubMed
高影响因子
SENSORS
·
2022
·Vol. 23
·期 1
·91
·
IF 3.847
Yanlu Chen,Xinxin Pu,Xinyu Xu,Menghan Shi,Hui-Jun Li,Ding Wang
The traditional self-supported piezoelectric thin films prepared by filtration methods are limited in practical applications due to their poor tensile properties. The strategy of using flexible polyethylene terephthalate (PET) fabric as the flexible substrate is beneficial to enhancing the flexibility and stretchability of the flexible device, thus extending the applications of pressure sensors. In this work, a novel wearable pressure sensor is prepared, of which uniform and dense ZnO nanoarray-coated PET fabrics are covered by a two-dimensional MXene nanosheet. The ternary structure incorporates the advantages of the three components including the superior piezoelectric properties of ZnO nanorod arrays, the excellent flexibility of the PET substrate, and the outstanding conductivity of MXene, resulting in a novel wearable sensor with excellent pressure-sensitive properties. The PET/ZnO@MXene pressure sensor exhibits excellent sensing performance (S = 53.22 kPa−1), fast response/recovery speeds (150 ms and 100 ms), and superior flexural stability (over 30 cycles at 5% strain). The composite fabric also shows high sensitivity in both motion monitoring and physiological signal detection (e.g., device bending, elbow bending, finger bending, wrist pulse peaks, and sound signal discrimination). These findings provide insight into composite fabric-based pressure-sensitive materials, demonstrating the great significance and promising prospects in the field of flexible pressure sensing.Keywords:flexible pressure sensors;MXene;pressure-sensitive;ZnO nanoarrays
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 8
·2201425
·
IF 3.6
Lingling Liu,Hongdie Yin,Wei Guo,Bi Jia,Hanmei Jiang
Ti 3 C 2 T x MXene is one of the most promising electrode materials for supercapacitors, but it often suffers in poor experiment gravimetric capacitance, which limits practical applications in industry needs. Herein, etched Ti 3 C 2 T x MXene with high gravimetric capacitance is prepared by chemical etching of MXene with concentrated alkaline solution. The intercalation of K + and the scissor role of OH − can simultaneously enlarge the interlayer spacing and cut the size of sheets, which lead to the high active-site concentration and cation diffusion. As a result, the etched Ti 3 C 2 T x MXene displays high gravimetric capacitance of 368.1 F g −1 at 2 A g −1 and outstanding cycling stability without capacitance loss over 5000 cycles at 6 A g −1 ,and the surface capacitance contribution in etched Ti 3 C 2 T x MXene occurs to a greater extent compared with the pristine MXene. Moreover, the effect of chemical etching on the supercapacitor performance and energy-storage mechanism indicates that the active-size concentration and cation diffusion could be maximized when the chemical etching conditions are appropriate, leading to the highest performance of etched Ti 3 C 2 T x MXene. Herein, it is demonstrated that the chemical etching approach is applicable to design MXenes with high gravimetric capacitance to maximize their potential applications in energy-storage applications and other fields.
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Nano Energy
·
2023
·
IF 17.6
Mingyuan Chao,Pengju Di,Yue Yuan,Yajin Xu,Liqun Zhang,Pengbo Wan
Multifunctional flexible wearable epidermic sensors have gained enormous attention for their promising potential applications in personal health management, electronic skins and intelligent human-machine interaction. However, it remains a critical challenge to realize a flexible breathable sensing device with reliable sensing performances for comfortably wearable human motion detection and ultrasensitive human-machine interfacing with the integrated functional capability of disease diagnosis and subsequent photothermal therapy simultaneously. Herein, a flexible breathable epidermic sensor is fabricated by delicately assembling conductive MXene nanosheets and silver nanowires (AgNWs) onto electrospun elastomeric substrates for ultrasensitive sensing and on-demand photothermal therapy. The as-prepared flexible breathable electronic sensor presents a broad sensing range (up to ∼120 %), ultrahigh sensitivity (gauge factor (GF) up to 4720), extremely low detection limit, remarkable reliability, and robust biocompatibility for serving as the electronic skin to monitor human physiological signals and wearable human-machine interaction. Moreover, it exhibits brilliant photothermal properties for enhanced antibacterial effect and timely photothermal therapy after healthcare monitoring and disease diagnosis. This work provides a facile way of developing flexible breathable multifunctional electronic sensors featured with excellent sensing ability, brilliant breathability and reliable photothermal properties for long-term healthcare monitoring, ultrasensitive wearable human-machine interfacing, smart disease diagnosis and treatment.
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Green Energy & Environment
·
2023
·
IF 13.3
Yi Wang,Yangyang Wang,Chang Liu,Dongjian Shi,Weifu Dong,Baoliang Peng,Liangliang Dong,Mingqing Chen
Negatively thermo-responsive 2D membranes, which mimic the stomatal opening/closing of plants, have drawn substantial interest for tunable molecular separation processes. However, these membranes are still restricted significantly on account of low water permeability and poor dynamic tunability of 2D nanochannels under temperature stimulation. Here, we present a biomimetic negatively thermo-responsive MXene membrane by covalently grafting poly (N-isopropylacrylamide) (PNIPAm) onto MXene nanosheets. The uniformly grafted PNIPAm polymer chains can enlarge the interlayer spacings for increasing water permeability while also allowing more tunability of 2D nanochannels for enhancing the capability of gradually separating multiple molecules of different sizes. As expected, the constructed membrane exhibits ultrahigh water permeance of 95.6 L m −2 h −1 bar −1 at 25 °C, which is eight-fold higher than the state-of-the-art negatively thermo-responsive 2D membranes. Moreover, the highly temperature-tunable 2D nanochannels enables the constructed membrane to perform excellent graded molecular sieving for dye- and antibiotic-based ternary mixtures. This strategy provides new perspectives in engineering smart 2D membrane and expands the scope of temperature-responsive membranes, showing promising applications in micro/nanofluidics and molecular separation.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Yin Zhang,Yanping Huang,Bingqun Lin,Zupeng Chen,Xinwu Xu,Mingzhu Pan
Photocatalytic degradation is an eco-friendly technology for volatile organic compound (VOC) removal, but searching for a highly efficient photocatalyst system remains a challenge. Here, a novel photocatalyst , ZnO/Ti 3 C 2 T X composite, was developed by the electrostatic deposition strategy, wherein Ti 3 C 2 T X nanosheets serve as a support to provide abundant surface-active sites for loading ZnO spheres and adsorbing VOC molecules. Furthermore, successive catalytic centers are formed to enlarge the photocatalytic reaction interface , thereby minimizing the photogenerated electron transfer distances. Moreover, a Schottky heterojunction was successfully formed between the ZnO spheres and Ti 3 C 2 T X nanosheets , which further suppressed the recombination of photogenerated electron–hole pairs. As a result, the ZnO/Ti 3 C 2 T X composite exhibited enhanced photocatalytic activity , universality and stability in VOCs degradation. The photodegradation efficiencies of formaldehyde, methyl alcohol and acetone were as high as 91 %, 84 % and 80 % by ZnO/Ti 3 C 2 T X composite, respectively. The pseudo-first-order kinetic constant of formaldehyde decomposition on ZnO/Ti 3 C 2 T X was 2.69 times greater than that on pristine ZnO. This work presents a novel photocatalyst system of ZnO/Ti 3 C 2 T X composite and provides an insight for the development of highly efficient photocatalysts for the degradation of VOCs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Beibei Ma,Fu Chen,Yongzhi Cheng,Xian Wang,Shuoqing Yan,Rongzhou Gong,Hui Luo
High-performance microwave absorption materials are considered to be an effective solution to the increasing electromagnetic pollution. In this work, Ti 3 C 2 T x MXene@NiFe-layered double hydroxide (NiFe-LDH) derived multi-interfacial FeNi 3 /TiN@nitrogen-doped carbon (NC)@magnetic multiwalled carbon nanotube composites were prepared by a hydrothermal process and subsequent carbothermal reduction. The phase compositions, morphology, defects and electromagnetic parameters of the composites can be regulated by the thermal treatment temperature. The reflection loss value of the composite with a thickness of only 1.6 mm can reach − 43.75 dB when the heat treatment temperature is 900 °C, and the effective absorption bandwidth is 5.5 GHz with a thickness of 2.12 mm when the heat treatment temperature is 700 °C. The synergistic effects among the associated dielectric loss, magnetic loss and the impedance matching of the samples are also systematically investigated. This work provides a new perspective and an effective approach for acquiring MXene hybrids derived high-performance microwave absorbing materials.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Tianjiao Han,Weidong Zhu,Tianran Wang,Mei Yang,Yuanbo Zhou,He Xi,Peng Zhong,Dazheng Chen,Jincheng Zhang,Chunfu Zhang,Yue Hao
Two-terminal, mechanically-stacked perovskite/silicon tandem solar cells offer a feasible way to achieve power conversion efficiencies (PCEs) of over 35%, provided that the state-of-the-art industrial silicon solar cells and perovskite solar cells (PSCs) are fully compatible with one another. Herein, two-terminal, mechanically-stacked perovskite/silicon tandem solar cells are developed by mechanically interconnecting semitransparent PSCs and TOPCon solar cells with a MXene interlayer. The semitransparent PSCs are made from wide-bandgap perovskite Cs 0.15 FA 0.65 MA 0.20 Pb(I 0.80 Br 0.20 ) 3 films. Furthermore, the co-additives KPF 6 and CH 3 NH 3 Cl(MACl) are employed to reduce grain boundaries and intragranular defects in the perovskite, boosting the PCE of the semitransparent PSCs to a record-high value of 20.96% under reverse scan (RS) through a reduction in non-radiative recombination probability. These optimized semitransparent PSCs are then employed in MXene-interconnected two-terminal, mechanically-stacked tandem solar cells. The enhanced interfacial carrier transportation, with minimal influence on light transmission, imparted by the MXene flakes allows the tandem solar cells to achieve a stabilized PCE of 29.65%. The tandem cells also exhibit acceptable operational stability and are able to retain ≈93% and 92% of their initial PCEs after 120 min of continuous illumination or storage in ambient air for 1000 h, respectively.
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 63
·期 11
·3672-3683
·
IF 3.2
Min Zhang,Qili Yang,Kaiwen Liang,Lu Gao,Peng Lu,Cuicui Ding,Yuan Dang
The application of collagen-based hydrogel is severely restricted due to its poor mechanical strength and functional singleness. In this paper, two-dimensional MXene nanosheets were introduced into collagen/acrylic acid (AA) system, which was polymerized in situ to produce versatile hydrogel (GCol-MX-PAA). The tensile stress and compressive stress values of the resultant hydrogel at the MXene concentration of 5 mg/mL reached 211.5 kPa and 7.8 MPa, respectively, which were approximately 4.0 and 1.4 times higher than those of GCol-PAA. The bonding strength of the hydrogel reached 30.7 kPa in the porcine skin-adhesive model owing to the large number of free phenolic hydroxyl groups on GCol. Furthermore, GCol-MX-PAA could be applied to monitor large and subtle activities of human body due to the excellent electrical conductivity of MXene. Thanks to the outstanding photothermal conversion performance of MXene, the hydrogel could kill E. coli and S. aureus effectively under NIR irradiation. In addition, in vitro cytotoxicity test performed on L929 fibroblasts demonstrated the desirable biocompatibility of GCol-MX-PAA. The design strategy in this work gives guidance for the development of multifunctional collagen-based hydrogel in a wide range of applications. Highlights Versatile hydrogel constructed from GA-modified collagen, PAA, and MXene. The composite hydrogel displays improved mechanical properties. This hydrogel possesses superior tissue adhesion and strain sensitivity. This hydrogel shows desired photothermal antibacterial property and biocompatibility.
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