Nanoscale
·
2022
·Vol. 14
·期 48
·18010-18021
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IF 8.307
Guanshun Xie,Chuang Han,Fei Song,Yisong Zhu,Xuanyu Wang,Jialin Wang,Zhenjun Wu,Xiuqiang Xie,Nan Zhang
Engineering the spatial separation and transfer of photogenerated charge carriers has been one of the most enduring research topics in the field of photocatalysis due to its crucial role in determining the performances of photocatalysts. Herein, as a proof-of-concept, Ti3C2Tx MXene is coupled with a typical heterojunction of TiO2@CdS through a co-assembly strategy to boost electron pumping towards improving the photocatalytic efficiency. In addition to the band alignment-mediated electron transfer in TiO2@CdS–Ti3C2Tx heterojunctions, the plasmon-induced electric field enhancement of Ti3C2Tx is found to cooperate with the electron-reservoir role of Ti3C2Tx to extract photoinduced electrons. The synergistic dual functions of Ti3C2Tx promote multichannel electron transfer in TiO2@CdS–Ti3C2Tx hybrids to improve the photocatalytic efficiency. These results intuitively show that there is a wide scope to manipulate the spatial separation and transfer of photoinduced electrons by cultivating the fertile ground of Ti3C2Tx toward boosting the efficiency of solar-to-chemical conversion.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Junmei Liang,Qicheng Zhang,Haibo Zhao,Shaolei Zhao,Yulong Wu,Xiaobin Fan
Hydrodeoxygenation (HDO) of fatty acids to alkanes is key to convert renewable resources into biofuels. Here, we design a new Ti3C2Tx MXene-confined Ni catalyst with extraordinary catalytic performance in the HDO of palmitic acid. Due to the large two-dimensional surface and chemical activity, Ti3C2Tx MXene is able to disperse and anchor Ni particles through strong synergistic coupling. As a consequence, the obtained Ni/Ti3C2Tx catalyst exhibits excellent catalytic performance with a complete conversion of palmitic acid. It can be recycled in five runs without activity reduction, demonstrating good stability of the as-prepared catalyst. The facilitated catalytic performance can be ascribed to the synergic effect of metal Ni and Ti3C2Tx MXene. Ti3C2Tx MXene facilitates the adsorption and conversion of palmitic acid to aldehyde. The dispersed Ni particles benefit from the hydrogenation of hexadecanal intermediate with the cleavage of C–C bonds and the dehydration–hydrogenation of hexadecanol to form alkanes.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xiangrui Bu,Fa Ma,Qiang Wu,Haiyang Wu,Yubin Yuan,Long Hu,Chuanyu Han,Xiaoli Wang,Weihua Liu,Xin Li
Volatile organic compounds (VOCs) detection in ultra-low concentrations is highly demanded in industry and daily life. Ethanol is one of the most encountered VOCs. Through calcining the precursor of metal-organic frameworks (MOFs), which are in situ grown on 2D Ti 3 C 2 T x sheets, Co 3 O 4 /Ti 3 C 2 T x nanocomposites with the mesoporous structure were synthesized for ethanol sensing. The results showed that the Co 3 O 4 /Ti 3 C 2 T x sensor has an ultra-high response ( (190 towards 50 ppm ethanol), fast response/recovery speed (50 s/45 s to 50 ppm ethanol), a low detection limit (<1 ppm), ideal selectivity and long-term stability. Compared to the pure Co 3 O 4 and Ti 3 C 2 T x sensors, the Co 3 O 4 /Ti 3 C 2 T x nanocomposites sensor significantly improves ethanol-sensing performance. Within the nanocomposites, the 2D Ti 3 C 2 T x nanosheet acts as a favorable platform for the uniform nucleation and growth of Co 3 O 4 , while the mesoporous Co 3 O 4 can provide more adsorption sites for gas sensing. In addition, the formation of hybrid heterojunction is also an essential factor for enhanced sensing behaviors. This work provides a new avenue to develop nanocomposites based on metal oxide and 2D materials for VOCs sensing.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lin Yang,Pengfei Hou,Baoning Wang,Chunxiang Dall'Agnese,Yohan Dall'Agnese,Gang Chen,Yury Gogotsi,Xing Meng,Xiao-Feng Wang
Cs 2 AgBiBr 6 is considered an emerging candidate for lead-free inorganic double perovskite solar cells (PSCs). However, the photovoltaic performance of Cs 2 AgBiBr 6 is restricted while the reported power conversion efficiencies (PCEs) are almost lower than 3%. Here, we employed D149 indoline dye to sensitize the TiO 2 electron transport layer (ETL) and introduced Ti 3 C 2 T x MXene nanosheets into Cs 2 AgBiBr 6 to enhance its crystallization. Both Cs 2 AgBiBr 6 and D149 indoline dye could contribute to the photocurrent. Moreover, the calculations of the interface properties and electron structure were carried out based on density functional theory. Weak van der Waals forces between the interfaces of Cs 2 AgBiBr 6 and Ti 3 C 2 T x allow the perovskite to retain its semiconductor properties, while effectively weaken the Fermi level pinning (FLP). The high work function of Ti 3 C 2 T x adjusts the valence band of Cs 2 AgBiBr 6 through the Fermi level to improve carrier mobility. As a result, PCEs of 4.47 % under 1 sun illumination and 7.23 % under 200 lx indoor light illumination with enhanced long-term stability were achieved. Hence, this work demonstrates the great potential of Ti 3 C 2 T x for double PSCs and predicts other MXenes with higher work function for further applications.
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Small Science
·
2022
·Vol. 2
·期 7
·2200018
·
IF 0
Yajun Zhang,Long Pan,Peigen Zhang,ZhengMing Sun
High-performance electromagnetic (EM) absorbing materials are in urgent need due to severe EM pollution caused by fast development of communication technology and electronic devices. Gradient structure benefits EM absorbing performance. However, the relevant study is very limited, and the relationship between component layers and overall performance is unclear. Herein, a gradient structure containing impedance matching layer, lossy layer, and reflective layer is built via repeated casting-drying method using Ti 3 C 2 T x MXene and polyvinyl alcohol. With optimized gradient structure, the minimum reflection loss (RL) reaches −74.8 dB with effective absorbing bandwidth (EAB) covering the whole X-band. The good absorbing performance is ascribed to the good impedance matching, which is derived from the stepwisely increased permittivity of each layer. Moreover, it is found that RL reaches the lowest value when lossy layer permittivity is close to the average permittivity of impedance matching layer and reflective layer. In addition, the decrease of lossy layer permittivity causes the decrease of total thickness of the gradient structure. This work demonstrates the effectiveness of gradient structure toward strong and broadband microwave absorption and provides rules for designing proper gradient structures to satisfy different requirements.
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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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Surfaces and Interfaces
·
2023
·
IF 6.2
Caiqin Wang,Tingting Zhou,Cheng Qian,Lili Chen,Liyuan Hao,Shumeng Fu,Bingguo Feng,Xiaofei Yang
Ti 3 C 2 T x MXene nanonets (MNNs) with 3D fibrous architecture were obtained from Ti 3 C 2 T x MXene nanoplates (MNPs) via surface modifying of alkalization in concentrated KOH solution, which was further combined with carbon nanotube and used as catalyst supports for Pt nanoparticles. By controlling the treatment time of alkalization, the lamellar surface of MNPs was getting into fibration in different extent. The catalytic performances toward hydrogen evolution reaction (HER) of a series of Pt-loaded MNNs catalysts were investigated, in which 1 %Pt-MNNs-9 composite catalyst presented the best hydrogen evolution performance. In detail, 1 %Pt-MNNs-9 with 1 wt.% of Pt loading exhibits an overpotential of 60 mV at 10 mA·cm −2 , which is much lower than 1 % Pt-MNPs (274 mV). It also keeps stable performance for long term stability. The enhanced catalytic activity is probably due to the fact that, Ti 3 C 2 T x MNNs with 3D architecture not only possesses abundant sites to anchor Pt nanoaprticles, but also facilitates the mass and charge transfer, which are significantly beneficial to catalytic reaction. The 3D architecture MXene fibers are expected to have widespread applications including but not limited to energy storage/conversion, and catalytic fields.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
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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ACS Applied Materials & Interfaces
·
2021
·
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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Surfaces and Interfaces
·
2024
·
IF 5.7
Yanling Jin,Jiahui Geng,Yilan Wang,Zirui Zhao,Zhengyan Chen,Zhengzheng Guo,Lu Pei,Fang Ren,Zhenfeng Sun,Peng-Gang Ren
As the emerging 2D materials, MXenes have been regarded as promising electrode materials in supercapacitor as power supply for wearable and portable electronic devices due to their metallic conductivity, hydrophilic feature, abundant functional groups, and large theoretical specific surface area etc. The capacity and rate capability of MXene-based electrodes is limited by the sheet restacking, hindering their further development. Herein, Ti 3 C 2 T x MXene/graphene/carbon nanotubes (MXene/graphene/CNTs) flexible film was successfully fabricated by vacuum assisted filtration. Intercalation and confinement of graphene and carbon nanotubes between the Ti 3 C 2 T x MXene nanosheets could increase the spacing and specific surface area, alleviate the stacking of MXene nanosheets, thus enhancing the electrochemical properties. The prepared MXene/graphene/CNTs film possesses increased specific surface area, average pore size, pore volume (112.259 m 2 g −1 , 9.982 nm, 0.276 cm 3 g −1 ), compared to MXene (93.088 m 2 g −1 , 3.786 nm, 0.088 cm 3 g −1 ). Consequently, MXene/graphene/CNTs delivers high area specific capacitance of 1862.5 mF cm −2 at 1 mA cm −2 and excellent rate capability (1525 mF cm −2 , 81.88 % at 20 mA cm −2 ). Flexible asymmetric supercapacitor constructed with MXene/graphene/CNTs film and active carbon as positive and negative electrodes, and PVA/H 2 SO 4 gel as solid electrolyte, achieves an energy density of 133.75 μWh cm −2 at the power density of 750 μW cm −2 . In addition, there is still 94.9 % of the initial performance after cycling 8000 charge/discharge cycles at 10 mA cm −2 , corresponding to a single-turn decay rate down to 0.00019 %. Besides, this flexible supercapacitor manifests outstanding electrochemical stability at different bending times. These advantages make the flexible supercapacitor device very promising for wearable electronics applications.
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ACS Omega
·
2024
·
IF 3.7
Huiqin Li
Soft electro-ionic actuators have received extensive research and attention due to their advantages such as low voltage response and adjustable deformation. However, they have not been able to enter the actual industry application like traditional rigid actuators; one of the reasons may be that the kinematic properties of actuators have been less studied. The electro-ionic actuator based on Ti3C2Tx MXene-CNT/PPy electrode prepared in this paper shows good bending displacement (18.8 mm) and strain (0.63%) under 4 V voltage. In this article, the overlapping nature and exponential function relationship of the actuator end-point trajectories are preliminarily discussed, and the morphology change and cubic polynomial function relationship of the actuator body are considered. Moreover, in application, a novel proof-of-concept model of smart wearable finger straps is proposed. This study is a unique attempt and is hoped to provide a new research perspective in the field of soft electro-ionic actuators.
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Materials Today
·
2025
·
IF 22
Bin Chen,Nan Jian,Junping Hu,Dianlun Wu,Yue Jiang,Xiaofeng Zhang,Jiatao Xie,Li Guo,Tao Song,Jiaen Huang,Shaojuan Luo,Wei Wei,Dongfeng Diao,Lina Li,Yingguo Yang,Deliang Zhu,Lei Wang,Yang Huang,Feng Rao
Two-dimensional (2D) MXenes are renowned for the unique feature of strong metallic conductivity, whereas the lack of semiconductive nature has become a crucial bottleneck that impedes MXenes’ rapid development in electronic devices. The challenge mainly comes from the stringent requirements for specific 2D compositions, whose synthesis and/or exfoliation techniques are too difficult to succeed. Here we proposed a facile and universal approach for fabricating semiconductive MXenes. Our demonstration showed that through hydrothermal-assisted intercalation treatment of the prototypical MXene-Ti 3 C 2 T x , shallow and deep Ti-lattice vacancies can be generated in its 2D nanosheets, weakening the original strong metallicity and even facilitating the wide-bandgap semiconductivity. Reciprocating bias polarization on the semiconductive 2D-Ti 3 C 2 T x nanosheet can induce reversible electrochemical-like migration of the surface anionic ligands, which enables high-nonlinearity and ultralow-current electrical switching capabilities for potential volatile selector applications. Our idea opens a new avenue for tuning the physical and chemical properties of MXenes, promoting their wide applications, especially in the field of 2D electronics.
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