ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Jiangzhou Qin,Baojun Liu,Kwok-Ho Lam,Shijie Song,Xinyong Li,Xia Hu
To improve the photocatalytic efficiency of the N2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal–organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type II heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 μmol gcat–1 h–1). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Sainan Zhang,Ying Liu,Min Feng,Bowen Zhang,Tongtong Yu,Shiwei Xu,Guoyun Sun,Daoai Wang
In this study, a new photoelectrochemical material is fabricated by loading two-dimensional leaf-like Ti 3 C 2 MXene nanosheets into the TiO 2 nanorod array to form Ti 3 C 2 nanosheets/TiO 2 nanorod (Ti 3 C 2 /TiO 2 NR) composite photoanode materials. The unique two-dimensional/one-dimensional (2D/1D) composite photocatalytic materials enhance the photoelectrochemical water splitting performance under simulated solar light (100 mW cm −2 ) and yield a high photocurrent density of 1.41 mA cm −2 at 1.23 V vs . reversible hydrogen electrode (V vs. RHE ) and photoconversion efficiency of 0.46% at 0.78 V vs. RHE , which are almost 3.13 and 5.82 times higher, respectively, than those of the pure rutile TiO 2 NRs. The enhanced photoelectrochemical performances are attributed to the photogenerated electrons produced by TiO 2 NR which could be quickly transported by Ti 3 C 2 nanosheets due to their good electrical conductivity and increased specific surface area, which improve the separation efficiency of electrons and holes. These Ti 3 C 2 /TiO 2 NR, as new photocatalytic materials, have promising potential applications in the fields of photoelectrochemical water splitting, solar cells, and other photocatalytic devices.
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MATERIALS LETTERS
·
2020
·
IF 3.204
Qiuguo Wang,Xiangyue Xiao,Xinwen Hu,Liangbin Huang,Ting Li,Minghui Yang
Molecularly imprinted electrochemical sensor for ascorbic acid (AA) detection was prepared based on MXene modified glassy carbon electrode (MIPs/MXene/GCE). MXene with layered structure was synthesized by chemical etching method and the o-phenylenediamine (o-PD) polymer was electrochemically polymerized onto MXene modified electrode surface. With the binding of AA molecules onto electrode, the current response of the sensor was decreased. Under the optimized experimental conditions, the current response change of the sensor was in linear with the concentration of AA in the range from 0.5 μM to 10 μM with detection limit of 0.27 μM. The sensor has good selectivity, which was applied to the determination of AA in vitamin C tablets.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Chang Ma,Qi Yuan,Haishun Du,Ming-Guo Ma,Chuanling Si,Pengbo Wan
Over the past few years, wearable electronics and smart textiles have seen tremendous growth in both academia and industries. However, it is still a challenge to prepare robust, flexible, wearable, and multiresponsive textile electronics. A newly blooming two-dimensional (2D) transition-metal carbide/nitride (MXene) is regarded as an ideal active material to build multifunctional electronics due to its intriguing properties. Herein, a hydrophobic and multifunctional textile composite (Si-MAP) was prepared by decoration of conductive MXene nanosheets onto air-laid paper, followed by wrapping with poly(dimethylsiloxane) (PDMS). These obtained smart textiles exhibited excellent electronic/photonic/mechanical triresponsive properties: Si-MAPs could reach high equilibrium temperatures (104.9 and 118.7 °C) under quite low power illumination (1.25 W cm–2) and working voltage (4 V). The Si-MAP pressure sensor exhibited high sensitivity and rapid response time (30–40 ms), which can capture a wide range of human movements. Moreover, the thin PDMS layer not only rendered the textile composites hydrophobic but also improved the stability and adaptation for daily use. Remarkably, the hydrophobic Si-MAPs have maintained the advantages of breathability and washability, which make them suitable for wearing. Thus, this smart Si-MAP textile provides a reference for the study of the next generation of light, portable, and wearable textile-based electronic devices.
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PubMed
高影响因子
DALTON TRANSACTIONS
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2020
·Vol. 49
·期 27
·9268-9273
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IF 4.174
Lu He,Chuan Tan,Chuanchao Sheng,Yuanzhao Chen,Fengjiao Yu,Yuhui Chen
FeOOH is one of the earth abundant and high-capacity anode materials for lithium-ion batteries (LIBs), but faces problems of inevitable structure collapse and thus poor capacity retention. Herein, we report a composite of β-FeOOH/Ti3C2Tx MXene sandwich by an intercalation of β-FeOOH nanorods within single-layer Ti3C2Tx MXene flakes. After 100 cycles, the β-FeOOH/Ti3C2Tx composite retains a capacity of 937.5 mA h g−1 at 200 mA g−1, and 671.4 mA h g−1 at 1 A g−1. The composite as an anode in LIB delivers improved cyclability and better high-rate performance compared to pristine β-FeOOH, which result from the excellent conductivity of single-layer MXene, facilitating mass transport by the sandwich structure. This work provides a strategy for the design of electrodes, particularly in Na-ion and K-ion batteries, which involve active materials that experience volume change and structural damage during cycling.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
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IF 6.444
Qianfan Zhou,Kunpeng Qian,Jianhui Fang,Miao Miao,Shaomei Cao,Xin Feng
With the mushrooming of smart electronic devices, ultrathin Ti 3 C 2 T x MXene based EMI shielding materials with long term durability have aroused much interest. Herein, 2D Ti 3 C 2 T x /g-C 3 N 4 heterojunction films were firstly assembled using cellulose nanofibrils (CNF) as green binder via a solution-based pressured-filtration process. The heterojunction film with Ti 3 C 2 T x /g-C 3 N 4 mass ratio of 5:1 (28.20 µm in thick) exhibited distinguished performance with EMI shielding effectiveness of 42.99 dB in X-band and high tensile strength of 23.85 MPa. Specially, the generation of photo-electrons from g-C 3 N 4 nanosheets reduced TiO 2 into lower valence states under 365 nm UV light-irritation, resulting in lower loss on electrical conductivity as well as EMI shielding performance compared to their unilluminated counterparts. The reduction on TiO 2 offered by the g-C 3 N 4 enables the heterojunction film to be considered as a promising alternative EMI shielding material for future potential applications, because it can run long time just need UV light modulation.
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Feitian Ran,Tianlin Wang,Siyu Chen,Yuyan Liu,Lu Shao
2D transition metal carbide (MXene) based flexible films have received increasing attention in the application of energy storage for portable and wearable electronic devices. However, the self-restacking caused by Van der Waals interactions between the layers lead to insufficient access to allow the electrolyte ions to contact the active material. Herein, we rationally utilized the freeze-drying technique to prepare MXene film electrode for alleviating its self-restacking and improving the electrochemical performances. Through freeze-drying treatment, the frozen solvent molecules were removed by sublimation, and alleviating the adverse effect of van der Waals forces and contributing to the enlarged layer space. The constructed freeze-dried MXene (f-MXene) films generate unique porous architecture, which can provide highly efficient ion diffusion and transport channels. Consequently, the typical f-MXene-10 film exhibit good specific capacitance (341.5 F g −1 /922.1 F cm −3 at 1 A g −1 ) and desired capacitance retention of 60.4% from 1 to 10 A g −1 . Moreover, the assembled asymmetric device delivered a maximal gravimetric energy density of 6.1 Wh Kg −1 , volumetric energy density of 16.4 Wh L −1 and a good capacitance retention of 89.3% after 10,000 cycles. The rationally designed synthesizing route has attractive promise to promote MXene materials for diverse energy and environmental applications.
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Advanced Materials Technologies
·
2020
·Vol. 5
·期 9
·2000262
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IF 5.969
Yukun Jin,Bo Wen,Zixiong Gu,Xiantao Jiang,Xiaolan Shu,Zhenping Zeng,Yupeng Zhang,Zhinan Guo,Yun Chen,Tingting Zheng,Yutao Yue,Han Zhang,Huijun Ding
Wearable sound detectors require strain sensors that are stretchable, sensitive, and capable of adhering conformably to the skin, and toward this end, 2D materials hold great promise. However, the vibration of vocal cords and muscle contraction are complex and changeable, which can compromise the sensing performance of devices. By combining deep learning and 2D MXenes, an MXene-based sound detector is prepared successfully with improved recognition and sensitive response to pressure and vibration, which facilitate the production of a high-recognition and resolution sound detector. By training and testing the deep learning network model with large amounts of data obtained by the MXene-based sound detector, the long vowels and short vowels of human pronunciation are successfully recognized. The proposed scheme accelerates the application of artificial throat devices in biomedical fields and opens up practical applications in voice control, motion monitoring, and many other fields.
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CELLULOSE
·
2020
·Vol. 27
·期 13
·7475-7488
·
IF 4.21
Song Quancheng,Zhan Zeying,Chen Binxia,Zhou Zehang,Lu Canhui
Polypyrrole (PPy) has received extensive attention in supercapacitor electrodes due to its promising electrochemical activity, while the poor cycling stability and densely packed structure limited its electrochemical performance. Herein, we demonstrate the fabrication of flexible and freestanding PPy@bacterial cellulose (BC)/MXene composite film with significantly enhanced electrochemical performance. PPy nanoparticles were uniformly deposited on BC nanofibers via in situ polymerization, and assembled with highly conductive MXene (Ti 3 C 2 T x ) nanoflakes through strong interfacial interactions. BC as a biological template can effectively disperse PPy nanoparticles. The intercalation of PPy@BC nanofibers into Ti 3 C 2 T x layers constructs hierarchically packed nanofibrous structure, which provides extensive accessible electrochemical active sites. Freestanding PPy@BC/Ti 3 C 2 T x (PBM) electrode exhibits superior specific capacitance (gravimetric and areal capacitance of up to 550 F g −1 and 879 mF cm −2 , respectively) and excellent capacitance retention of 83.5% after 10,000 cycles. In addition, the symmetric supercapacitor assembled by PBM papers present a high energy density of 33.1 W h kg −1 (power density of 243 W kg −1 ) and excellent capacitance retention. The elaborately designed nanostructure and PPy-Ti 3 C 2 T x hybridization make great contribution to the enhanced electrochemical performance, which provide a feasible method for the fabrication of conductive polymer-based high-performance flexible supercapacitor electrodes. Graphic abstract
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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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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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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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