APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hongyun Xue,Qiuyang Yan,Lu Chen,Yan Wang,Xiaofeng Xie,Jing Sun
In the research of photocatalytic removal of VOCs, the mineralization rate of organic pollutants has been ignored. High mineralization rate means the reduction of intermediates, which is more conducive to environmental protection and photocatalysts stability. In this work, we successfully compounded conductive Ti 3 C 2 with TiO 2 for photocatalytic degradation of o-xylene. The production of CO 2 by 1 % Ti 3 C 2 -TiO 2 composite was about twice than that of pure TiO 2 . The results of PL and photocurrent response showed that 1 % Ti 3 C 2 -TiO 2 composite had less carrier recombination and higher photocurrent response, which endows its stronger photocatalytic oxidation ability than TiO 2 . The in-situ infrared spectroscopy revealed that more aromatic anhydride species deposited on the TiO 2 surface and led to the less mineralization degree for TiO 2 sample. The four-cycle tests further confirmed the better stability of 1 % Ti 3 C 2 -TiO 2 sample. This work disclosed the role of Ti 3 C 2 in enhancing the mineralization of VOCs, which may provide a new perspective for the design of high-efficiency photocatalysts.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
·
IF 9.463
Yinan Zhao,Jiayun Chen,Xuejun Lai,Hongqiang Li,Xingrong Zeng,Changcheng Jiang,Qingtao Zeng,Kunquan Li,Zhengzhong Wu,Yunkun Qiu
The rapid development of intelligent fire protection technology puts forward higher requirements for the versatility and fire safety of aerogels . Herein, a multifunctional fire-retardant polyimide/MXene/Ag 2 Se nanowires (PMA) composite aerogel was fabricated via freeze-drying and dip-coating. The PMA aerogel demonstrated good strength and flexibility. The improved thermoelectric properties of the PM 1 A 1 aerogels were attributed to the energy filtration effect between the MXene and Ag 2 SeNW, which endowed the aerogels with accurate temperature sensing and sensitive, repeatable, and stable fire-warning performance. Even after 20 fire-warning test cycles, the trigger time was 4–8 s when exposed to the fire. Furthermore, in the vertical burning test, the PM 1 A 1 aerogel demonstrated remarkable flame retardancy with a limiting oxygen index (LOI) as high as 53% and quickly self-extinguished. Meanwhile, the peak heat release rate of the PM 1 A 1 aerogel was reduced by more than 65% compared with that of the PI aerogel . In addition, the PM 1 A 1 aerogel also represented a good performance in thermostability and thermal insulation . And the sensitive piezoresistive sensing and controllable Joule heating performance enabled the aerogels to be used in wearable devices and heat management, respectively. After coated with polydimethylsiloxane (PDMS), the obtained PDMS-coated PMA aerogel exhibited superhydrophobic and self-cleaning performance. This work provides a facile approach to fabricate PI aerogel with high fire safety and multi-functions, showing promising applications in transportation, building, firefighting, and wearable devices.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
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2021
·Vol. 68
·期 12
·2326-2336
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IF 1.967
Yunxiu Sun,Baoli Wang,Ying Deng,Hui Cheng,Xiaoqing Li,Lijun Yan,Guangjiu Li,Wei Sun
In this work, reduced graphene oxide (rGO) and titanium carbide (Ti 3 C 2 T x ) nanocomposite was prepared by the self-assembly method and used for electrode modification. The rGO-Ti 3 C 2 T x nanocomposite was examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Then, an electrochemical hemoglobin (Hb) biosensor was prepared on the nanocomposite-modified electrode and used for the determination of trichloroacetic acid (TCA) and hydrogen peroxide (H 2 O 2 ). Direct electrochemistry of Hb on the modified electrode was examined with the calculations of the electron transfer number, electron transfer coefficient, and the reaction rate constant. The presence of the rGO-Ti 3 C 2 T x nanocomposite on the electrode can improve the effective surface area and biocompatibility of the electrode interface, obtaining a higher electron transfer rate. Furthermore, this electrochemical Hb biosensor exhibited excellent stability, reproducibility, and repeatability in TCA and H 2 O 2 analyses.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Hui Zhi,Xiaobo Zhang,Fengya Wang,Peng Wan,Liang Feng
Flexible pressure sensors made of carbon materials have been used in electronic skins (e-skins), whose performance can be enhanced if composite sensing materials are used. Herein, an MXene/polyaniline/bacterial cellulose (MXene/PANI/BC) aerogel sensor has been fabricated through the self-assembly process between the MXene and one-dimensional active material. Combined with fewer-layer or single-layer MXenes, the as-fabricated aerogel could be used as the active layer of the pressure sensor, monitoring tiny motion signals of finger bending, wrist bending, and pulse beating. Bluetooth wireless transmission could also be realized to monitor the real-time spatial pressure distributions on the mobile phone, making the aerogel-based sensor an ideal candidate in e-skins. Meanwhile, the aerogel-based sensor is sensitive toward NH3 due to the unique three-dimensional (3D) structure of the aerogel and the abundant terminal groups (such as −O, −OH, and −F) of the MXene in the system that ensure efficient electronic transfer for the sensing process and create active sites for the absorption with the target gas. This work offers a versatile platform to develop MXenes to fabricate 3D composite aerogels for high-performance flexible multiple sensors.
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ACS Nano
·
2021
·
IF 15.881
Caiyue Wen,Xiao Li,Ruixuan Zhang,Chunyang Xu,Wenbin You,Zhengwang Liu,Biao Zhao,Renchao Che
Two-dimensional materials, especially the newly emerging MXene, have attracted numerous interests in the fields of energy conversion/storage and electromagnetic shielding/absorption. However, the inherently inevitable aggregation and absence of magnetic loss of MXene considerably limit its electromagnetic absorption application. The introduction of magnetic component and favorable structural engineering are the alternatives to improve the microwave absorption (MA) performance. Herein, we report a spheroidization strategy to assemble double-shell MXene@Ni microspheres, where the commonly lamellar MXene are reshaped into three-dimensional microspheres that provide the substrate for oriented growth of Ni nanospikes. Whereas this structural feature offers massive accessible active surfaces that effectively promote the dielectric loss ability, the introduction of magnetic Ni nanospikes enables the additional magnetic loss capacity. Benefiting from these merits, the synthesized 3D MXene@Ni microspheres exhibit superior MA performance with the minimum reflection loss value of −59.6 dB at an ultrathin thickness (∼1.5 mm) and effective absorption bandwidth of 4.48 GHz. Moreover, the electron holography results reveal that the high-density anisotropy magnetism plays an important role in the improvement of MA performance, which provides an insight for the design of MXene-based materials as high-efficient microwave absorbers.
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Sustainable Energy & Fuels
·
2021
·Vol. 6
·期 2
·299-308
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IF 6.367
Zhe Sun,Mehraj Ahmad,Zongxia Gao,Zhu Shan,Liangmao Xu,Sha Wang,Yongcan Jin
Controllable ion transport in nanofluidic membranes is highly desirable for industrial applications, including energy harvesting, molecular separation, and nanofiltration. However, the nanofluidic materials synthesized using the traditional approach still suffer from complex preparation, insufficient charge density, and poor aqueous stability. Herein, we describe a mechanically robust nanofluidic membrane coupled with highly charged lamellar nanochannels, which is formed through the sequential bridging and alignment of MXene nanosheets and TEMPO-oxidized cellulose nanofibers (MXene/CNF). The ion conductivity of the MXene/CNF membrane reached up to 4 × 10−3 S cm−1 at a low KCl concentration, while its tensile strength was as high as 171.2 MPa. The MXene/CNF membrane also showed prominent aqueous stability and maintained its high ion conductivity over a period of 10 days. Moreover, an osmotic energy generator based on the MXene/CNF membrane yielded the maximum output power density of 0.15 W m−2 at 1000-fold concentration gradient. The results demonstrated that the MXene/CNF-based nanofluidic membrane can be effectively utilized in the development of high-performance osmotic energy conversion devices.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Daotong Zhang,Min Luo,Kai Yang,Pei Yang,Chaozheng Liu,Weimin Chen,Xiaoyan Zhou
Ti 3 C 2 T x (a typical MXene) films can be used as free-standing electrodes due to their ultrahigh electrical conductivity , well flexibility and high electrochemical activity. However, inevitable self-restacking issue of Ti 3 C 2 T x nanosheets largely decreases exposed area and impedes the ion transport in Ti 3 C 2 T x film. Herein, hierarchically porous carbon (HPC) introduced into Ti 3 C 2 T x film can not only act as the pillar for adjacent Ti 3 C 2 T x nanosheets to prevent their typical self-restacking and further accelerate rapid ion transport in the transverse direction, but also ensure rapid ion transport in the longitudinal direction by introducing abundant macro/mesopores. By easily changing the amount of HPC (0–60%), the porosity of the film is well controlled, with adjustable specific surface area (SSA) from 8 m 2 g −1 to 755 m 2 g −1 . The prepared quasi-solid-state supercapacitor fabricated by 60% HPC shows a good stability after different bending angles, high capacitance of 211 mF cm −2 , energy density of 4.68 μW h cm −2 at 19.91 μW cm −2 , and high capacitance retention of 86% after 10,000 charging-discharging cycles. This work will pave a facile route to alleviate the self-restacking phenomenon of Ti 3 C 2 T x film by constructing transverse and longitudinal channels for rapid ion transport.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yu Feng,Meng Zhang,Hong Yan,Yu Zhang,Ruijie Guo,Huifang Wang
MXene , as a promising electrode material, exhibits outstanding performance in supercapacitors because of its excellent chemical and physical properties. However, the conventional inefficient exfoliation methods and the blocked ion transmission channels caused by self-weight accumulation of MXene nanoflakes all severely limit its development. Here, this work reports an efficient microwave exfoliation method that requires only 90s to exfoliate multilayered MXene into few-layer MXene (2–3 nm) with large-size (4∼6 μm). Additionally, to enhance its capacitance and cycling stability, the exfoliated MXene was composited with graphene quantum dots , which shows a larger specific surface area, and importantly performs ultrahigh capacitance (343 F/g at a current density of 1 A/g) and excellent capacitance retention (100% after 10,000 cycles at a current density of 5 A/g). When using composite material as an anode, the assembled supercapacitor exhibits an excellent energy density of 35 Wh/kg at a power density of 384 W/kg with 107% capacitance retention after 10,000 cycles. Not only does this work provide an efficient approach to exfoliate MXene, but it also prepares a highly promising material for energy storage materials .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Qihuang Deng,Yuehao Huang,Binghe Chen,Maolin Bo,Yefeng Feng
Strontium titanate (STO) is a ferroelectric ceramic that shows paraelectric behaviour at room temperature , leading to a low dielectric constant in polymer composites with STO particles for energy storage applications. In this study, to improve the dielectric constant of polymer/STO composites, STO filler was modified via its hybridisation with conductive V 2 C MXene to form high-polarity interphase. The high-polarity mechanism of the V 2 C/STO interphase was analysed using density functional theory (DFT) calculations. An interesting connection between V 2 C and STO through an interfacial single oxygen atom was observed. Polymer composites containing hybrid filler exhibited balanced electrical properties, including a high dielectric constant, low tanδ, and high breakdown strength . The novelty of this study lies in the strategy of improving the dielectric response of a paraelectric ceramic filler through heterojunction modification. Consequently, the composite with 9 wt% hybrid filler exhibited a high dielectric constant of ~87 and low tanδ of ~0.038 at 100 Hz along with a reasonably high breakdown strength of ~233 MV/m. It is expected that this study will contribute to the effective design of high-polarity hybrid ceramic fillers for advanced composite dielectric applications.
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CHEMOSPHERE
·
2021
·
IF 7.086
Mojtaba Mansoorianfar,Khashayar Shahin,Akbar Hojjati–Najafabadi,Renjun Pei
In this study, Ti 3 C 2 MXene nanofragments with a size distribution of about 20 nm were laden on the well-characterized bacteriophages via electrostatic bonding , introducing a new antibacterial agent as a modified virus vector to be used in high-risk bacterial environment. At > MIC of MXene, the MXene-functionalized bacteriophage would be much more active in attacking the bacteria because of the high specificity for host receptors’ recognition and targeting ability of bacteriophage and bacterial surface negative charge when comparing to the phage alone. Also, the induced positive surface moieties drive MXene nanofragments toward the negative surface charge of bacteria. The main mechanisms are the specific targeting capacity of bacteriophages, often by lysing the host and bursting out, and the physical interaction of MXene nanofragments with the bacterial cell membrane, which may rupture the cell wall in microbial death. The results described that the Ti 3 C 2 MXene significantly enhanced the bacteriophage adsorption rate and stability over long-standing cultivation in aquatic environments providing superior antibacterial efficacy against the bacterial cells target. The Ti 3 C 2 MXene-laden bacteriophage demonstrated a fast, efficient attaching to bacterial host cells, high antibacterial potential, and reduced 99.99% of the artificial contamination in water samples. Interestingly, no re-growth of target bacteria was observed in the samples during the experiment period, and the count of bacteria constantly remained below the detection threshold. This research raises attention in proposing a novel antibacterial agent to be synthesized through a simple one-step technique devoid of shortcomings of post-treatments in conventional antibacterial treatments.
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Materials Today Physics
·
2021
·
IF 9.298
Y. Zhang,Y. Xu,L. Gao,X. Liu,Y. Fu,C. Ma,Y. Ge,R. Cao,X. Zhang,O.A. Al-Hartomy,S. Wageh,A. Al-Ghamdi,H. Algarni,Z. Shi,H. Zhang
0D Bismuth nanoparticles (Bi NPs) are grown on the surface of 2D few-layer Nb 2 CT x MXene to form the mixed-dimensional Nb 2 CT x @Bi Schottky heterojunction . The large surface to volume area characteristic of 2D Nb 2 CT x nanosheets can provide the sufficient sites for the growth of Bi NPs, which can not only prevent the aggregation of Bi NPs, but also effectively shorten the length and transmission time of charge transfer. The Schottky heterojunction generated at the interface could lead to the uniflow spreading process of electrons/holes, promotes the separation of photo-induced electron/hole pairs, and suppress the carrier recombination dynamics, thus leading to the enhanced performance of Nb 2 CT x @Bi-based optoelectronic devices. Systematic investigations demonstrate that Nb 2 CT x @Bi-based flexible photoelectrochemical (PEC)-type photodetector shows self-powered photodetection capability with fast response/recovery time (0.08/0.08 s), a photocurrent of 1.56 μA cm −2 , a responsivity of 585.25 μA W −1 , and a specific detectivity of 4.63 × 10 12 Jones. The photodetector exhibits self-powered capability after bending 180° for 1000 cycles. Additionally, the repeatable and reproducible ON/OFF signals can be detected after placing the photodetector in alkaline electrolyte for one month, suggesting the potential of Nb 2 CT x @Bi Schottky heterojunctions for practical applications in flexible optoelectronics.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Kai Hu,Tiantian Pang,Yanmei Shi,Pengzhao Han,Yuanqing Zhao,Wenjie Zhao,Huahui Zeng,Shusheng Zhang,Zhenqiang Zhang
A novel magnetic borate-modified MXene composite was prepared by in situ growth of Fe 3 O 4 particles onto the surface of phenylboronic acid modified Ti 3 C 2 T x nanosheets . The magnetic composite possesses highly selective recognition properties to catecholamines , and high adsorption capacity (up to 319.6 μmol g −1 ) for dopamine. Besides, the adsorption of urinary catecholamines can be accomplished within 2.0 min. The excellent adsorption performance can be assigned to its unique 2D layered structures, which helps to shorten the diffusion path and facilitate molecular transport. In addition, the multilayer adsorption and the synergetic interactions of borate affinity, van der Waals forces , hydrogen bonding and π-π stacking also contribute to the adsorption. By coupling the magnetic boronate affinity composites with high-performance liquid chromatography-fluorescence detection, a sensitive method for the determination of catecholamines in urine samples was proposed. The validation results revealed it can offer good linearities (correlation coefficients higher than 99%). The method detection limits were 0.06, 0.16, 0.03 and 0.14 ng mL −1 for norepinephrine , epinephrine, dopamine and isoprenaline , respectively, and relative recoveries for these catecholamines were in the range of 98.56–108.1%, 92.56–110.0%, 98.79–112.3% and 88.14–97.81%, respectively. The proposed method was successfully applied to analyze the catecholamines in the urine samples from 15 healthy volunteers and 16 patients with Alzheimer's disease. The results indicated that the magnetic borate-modified Mxene composite possesses superior extraction performance, and can be used as an outstanding candidate for the extraction of catecholamines in pre-clinical or clinical studies.
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