Nanoscale
·
2022
·Vol. 14
·期 48
·18010-18021
·
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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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Jingran Huang,Mingyuan Wang,Xiangzhao Zhang,Junnan Tao,Lei Lu,Guanjun Qiao,Guiwu Liu
To produce high energy density , clean hydrogen fuel by photocatalytic water splitting has become one of the important strategies for solving the shortage of fossil fuels in the future, so it is of great significance to improve photocatalytic performance. MXene with high conductivity and layered nanostructure is an excellent charge transport layer material, which can effectively enhance the photocatalytic performance of composites. Here, a novel 2D CdS/2D Nb 2 CT X composite was successfully prepared by a combination of electrostatic self-assembly and solvothermal reaction. The addition of Nb 2 CT X greatly hinders the agglomeration of CdS nanosheets , and the optimized CdS/Nb 2 CT X -40 composite presents a high photocatalytic H 2 evolution rate of 5040 μmol/g/h, which is 4.3 times higher than that of pristine CdS nanosheets. In particular, the formation of Schottky heterojunction leads to a significant redistribution of charges on the CdS/Nb 2 CT X composite, which can accelerate the photo-generated charge separation and transfer of CdS nanosheets, allowing more photo-generated electrons to drive the water splitting reaction. Moreover, the photoelectrochemical measurements, electron spin resonance (ESR) detection and the first-principles calculations confirm the effective charge transfer and more active free radicals of the CdS/Nb 2 CTx composite.
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Aggregate
·
2022
·Vol. 4
·期 1
·e248
·
IF 0
Yan Gao,Zhaodi Tang,Xiao Chen,Jiamin Yan,Yu Jiang,Jianhang Xu,Zhang Tao,Lei Wang,Zhimeng Liu,Ge Wang
Inherent weak photon-capturing ability is a long-standing bottleneck for pristine phase change materials (PCMs) in photothermal conversion application. To conquer this difficulty, herein, magnetic Fe 3 O 4 nanoparticles were in situ anchored between the layers and the surface of two-dimensional MXene for the infiltration of myristic acid (MA) by an in situ chemical anchoring strategy. Benefiting from the synergistic localized surface plasmon resonance effect of MXene and Fe 3 O 4 nanoparticles, our designed MXene@Fe 3 O 4 -MA composite PCMs harvested an ultrahigh photothermal conversion efficiency of 97.7%. During the photothermal conversion process, MXene can capture photons and convert solar energy into heat energy efficiently, and the in situ anchored Fe 3 O 4 nanoparticles further enhanced the photothermal conversion efficiency. Moreover, the introduction of Fe 3 O 4 nanoparticles improved the thermal energy storage density (144.17 J/g) of MXene-MA composite PCMs since Fe 3 O 4 nanoparticles provided more heterogeneous nucleation sites for MA. Simultaneously, MXene@Fe 3 O 4 -MA composite PCMs were endowed with excellent paramagnetism, and realized efficient magnetic-thermal conversion. Additionally, MXene@Fe 3 O 4 -MA composite PCMs exhibited excellent energy conversion stability, thermal stability, and reliability after undergoing multiple thermal cycles. Therefore, high-performance MXene@Fe 3 O 4 -based energy conversion composite PCMs are promising candidates to accelerate efficient utilization of the practical solar energy and magnetic energy
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SENSORS AND ACTUATORS B-CHEMICAL
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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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INTEGRATED FERROELECTRICS
·
2022
·
IF 0.836
Ran Wang,Qi Li,Juanjuan Yin,Zhiwei Liu,Lili Gao,Tifeng Jiao
Cubic fluorite CeO2 has band gap energy similar to that of TiO2, exhibiting a certain photocatalytic activity, and it can be widely used to adsorb and degrade various organic dyes. Herein, self-assembled MXene-CeO2 composites with CeO2 nanoparticles uniformly loaded on the surface and between the layers of MXene was prepared by the hydrothermal method. Through the microstructure analysis of MXene-CeO2 composites, it was proved that the MXene could not only effectively prevented the accumulation of CeO2 nanoparticles during the production process but also provided a large attachment site for the generation of nanoparticles. In addition, the self-assembled MXene-CeO2 exhibited good adsorption efficiency for adsorption of the cationic dyes rhodamine B (RhB) and methylene blue (MB) under ultraviolet light irradiation. Therefore, the prepared MXene-CeO2 composite nanomaterial has significantly higher performance in degrading dyes and can be widely used in wastewater treatment.
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Materials Today Chemistry
·
2022
·
IF 7.613
S. Chen,X. Li,P. Jiang,W. Peng,J. Tang,L. Li,L. Ye,S. Pan,C. Peng
High-performance catalytic reactions and easy-to-recycle property of noble metal catalysts are desirable in chemical productions, and a suitably combined pathway of both homogeneous and heterogeneous catalysis is promising in this regard. Herein, a novel thermoresponsive nanocomposite catalyst is designed through the “grafting-from” reaction of the thermoresponsive motifs and the “self-reduction” reaction of the noble metal ions at transition metal carbides (MXene) surface. The prepared catalyst with Au nanoparticles as active catalytic species, poly(N-isopropylacrylamide) as thermoresponsive switch, and MXene as catalyst-carrying substrate has a superior thermoresponsiveness of phase transitions (i.e., between suspended and aggregated states in aqueous conditions), which facilitates to the control of heterogeneous catalysis by surrounding temperatures. A high turnover frequency of up to 11.73 min −1 can be achieved for the 4-nitrophenol reduction at room temperature. Notably, the reaction can be easily terminated at elevated temperatures (e.g., 40 °C), with the catalysts being separated and recovered (i.e., by precipitation) in the meantime. The nanocomposite therefore combines both merits of the homogeneous catalysts (e.g., high-performance) and the heterogeneous catalysts (i.e., easy-to-recycle) and display tunable catalytic activity at low/high temperatures. The design principle and the smart ON/OFF control of the catalytic process demonstrated in this work are promising for industrial applications.
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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
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Junhuang Xu,Lin Zhang,Xuejun Lai,Xingrong Zeng,Hongqiang Li
Flexible piezoresistive pressure sensors may exhibit excellent sensing performances to be applied in wearable electronics, medical diagnosis, and electronic skin. Herein, we report a multi-layer and phased-responsive reduced graphene oxide/MXene-based piezoresistive pressure sensor with hierarchical microspines constructed by sandpaper as the template. Thanks to the multi-level and multi-layer structure, the obtained sensor realized phased response and showed wide detection range (up to 70 kPa), fast response (response/recovery time of 40/80 ms), and excellent working stability (1000 fatigue cycles). Furthermore, the sensor was successfully applied for detecting various human motions including pulse beats, cheek bulging, nodding, finger bending, speech recognition, handwriting, and other pressure signals. Besides, a 6 × 6 sensing matrix integrated by the sensors was able to sensitively perceive the distribution of plane pressure. The findings in this work conceivably stand out as a new strategy to fabricate high-performance piezoresistive pressure sensors in the fields of intelligent healthcare and medical diagnosis, wearable electronic devices, electronic skin, and human–machine interaction.
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Materials Today Communications
·
2022
·
IF 3.662
Yuanbo Tan,Mingjie Yi,Zhenye Zhu,Xueting Zhang,Ke Qin,Jiaheng Zhang,Zhu Rongshu
Despiting the technological promise and environmental friendliness of sodium-ion batteries (SIBs), relatively large sizes of Na-ions and moderate oxidation-reduction response slows down their wider-spread industrial implementation. To overcome this obstacle, we developed carbon-coated MoSe 2 /MXene heterostructures , in which MXene was covered on the MoSe 2 particles and the loose carbon linked all the coated particles while providing porosity. The density-functional theory was used to understand the electronic structure of the carbon-coated MoSe 2 /MXene (MoSe 2 /Mo 2 CT x /C) and the mechanism of exchanging charge between MoSe 2 and MXene. MoSe 2 /Mo 2 CT x /C as active anode material showed exceptional stability even after 2200 cycles in SIBs. Specifically, the capacities and retention rates observed for the batteries containing MoSe 2 /Mo 2 CT x /C and cycled at 0.5, 1, and 2 A g −1 rates were equal to 652.2, 484.4, and 238.4 mAh g −1 and 102.5%, 103.9%, and 86.3%, respectively. Thus, carbon-coated MoSe 2 /MXene can be utilized as active SIB anode materials.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jie Yang,Chen Wang,Liyuan Liu,Hongli Zhang,Jianhua Ma
Flexible and wearable pressure sensors have gained great popularity in consumer electronics due to their potential applications in human healthcare, E-skin, and artificial intelligence interactions. MXene is regarded as one of the most ideal candidate sensing materials due to its high electrical conductivity and controllable interlayer space. However, the easy-to-oxidize characteristic of MXene materials greatly restricts the sensitivity and reliability of sensor devices, especially in wet climates. Herein, a highly sensitive and waterproof flexible pressure sensor using a free-standing hydrophobic bacterial cellulose/Ti3C2Tx MXene (HBT) hybrid film as a sensing layer is fabricated by facile and effective nanocellulose intercalation and fluorine modification strategies. The obtained pressure sensor delivers high sensitivity (65.5 kPa–1), fast response (50 ms), wide linear sensing range (0.002–30 kPa) with a low detection limit of 0.57 Pa, and excellent repeatability over 50,000 cycles. Meanwhile, owing to the highly hydrophobic surface of the HTB film, the outstanding sensing features could be well retained, although immersed in water several times. Benefiting from the excellent sensing properties and water resistance, the HBT sensor serves as a wearable force sensor to monitor the full-range human physiological motions regardless of whether the conditions are normal or wet. This work provides a new pathway to design the MXene pressure sensor with high reliability and demonstrates the promising usage of HBT sensors in portable biomedical electronics.
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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 29
·295401
·
IF 3.953
Qiangqiang Wang,Yongsheng Fang,Maosheng Cao
Micro-supercapacitors (MSCs) are considered as the promising energy supply of miniaturized electronic devices. The electrode material, as one integral part, play a crucial role on the energy storage performance of MSCs. In our work, we constructed a heterojunction in MXene-PANI@MWCNTs (MPM) ternary composite, benefitting for the synergistic enhancement effect among MXene, polyaniline (PANI) and multiwall carbon nanotubes, an outstanding specific capacitance of 414 F g−1 (at 1 A g−1) has been achieved. MPM shows high capacitance retention at large current density (86.7%, at 10 A g−1) and long-term cycling stability of 90.4% for 10 000 cycles. Furthermore, we obtained MPM self-standing films, and constructed a flexible all-solid-state MSC based on the film electrode. A competitive charge storage capability of 30.2 mF cm−2 and long-term stability of 70.2% retention for 10 000 cycles was obtained in the MSC. Meanwhile, the MSC shows excellent flexibility, maintaining most capacitance under bending conditions. Moreover, using an integrated strategy, MSCs can obtain tunable voltages and currents that meet various practical requirements. All these results indicate that the MPM is an excellent charge storage material and will become a potential candidate for flexible energy-storage devices.
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