JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Bihui Tan,Yu Fang,Qianlin Chen,Xianquan Ao,Yang Cao
Bi 2 O 2 CO 3 (BOC) was successfully loaded on a highly conductive Ti 3 C 2 surface by the hydrothermal method, forming a unique BOC/Ti 3 C 2 heterostructure. The use of advanced characterization methods reveals the composition, morphology and photoelectric properties of the material. The results show that the interface formed by close contact between BOC and Ti 3 C 2 provides an effective channel for charge transfer between the two. Importantly, the photocatalytic degradation efficiency of BOC/Ti 3 C 2 for tetracycline (TC) is ~80%, which is significantly higher than the degradation efficiency of pure BOC and pure Ti 3 C 2 for TC. In addition, BOC/Ti 3 C 2 still has high catalytic activity in the degradation of complex mixed antibiotics. This is because BOC and Ti 3 C 2 have large specific surface areas, high light absorption capacity and efficient carrier separation after recombination. At the same time, the detected superoxide radicals ( O 2− ) and holes (h + ) are the main active substances. The degradation pathway and catalytic mechanism of the photocatalytic degradation of TC by BOC/Ti 3 C 2 are further explained. This research designed and developed a BOC/Ti 3 C 2 composite material for the photocatalytic degradation of tetracycline and mixed antibiotic wastewater, providing experimental methods and ideas for actual wastewater treatment.
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 39
·期 8
·2141-2146
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IF 6
Chuqiao Hu,La Li,Guozhen Shen
Main observation and conclusion Ti 3 C 2 MXene serving as superior electrical conductors presents more specific performance such as transparency, conductivity than gold (Au), and even could form a heterostructure with active materials of the functional devices. Here, a Ti 3 C 2 MXene-Te microplate van der Waals heterostructure based transparent near-infrared photodetector (PD) is exploited. Compared with Au-Te PD, the on-off ratio of the Ti 3 C 2 -Te PD is improved by seven orders of magnitude and reaches 9.51 × 10 7 under 1064 nm laser illuminations. Benefiting from the utilization of flexible PET substrate and Ti 3 C 2 conductors in manufacturing PD devices, the Ti 3 C 2 -Te PD exhibits excellent flexibility with no noticeable response change after being bent for different states and times. Moreover, 63% transmittance of the fabricated PD devices over the 500—1000 nm wavelength range is obtained. All the above results demonstrate the tremendous potential in wearable optoelectronics.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Yongshuai Yuan,Ye-Tang Pan,Wenchao Zhang,Mingjie Feng,Na Wang,De-Yi Wang,Rongjie Yang
As recently created inorganic nanosheet materials, more and more light has been shed on MXenes, which have emerged as a hotspot of intensive investigations. The simple exfoliation method for MXenes attracts numerous studies to pay efforts on. Compared with the extensive research about ultrasonication and mechanical milling, gas-assisted exfoliation has never been carried out for MXenes. Meanwhile, MXene-based nanocomposites are always prepared after exfoliation step by step. In this work, a facile way to fabricate a few-layered Ti3C2 MXene delaminated using phosphorous vapor evolved from commercial red phosphorous (RP) is put forward. The vapor deposits on the surface of Ti3C2 and also partially intercalates into the interlayers to obtain a novel two-dimensional RP/Ti3C2 nanocomposite directly. The P element strongly connects with the substrate by a covalent bond that improves the safety problems for RP during storage and usage. Due to the versatile feature of MXenes, the nanocomposite has the potential to be applied in a variety of fields. Herein, it is employed as a flame retardant for epoxide resin and effectively reduces fire disaster. The one-step exfoliation plus nanocomposite fabrication provides a more feasible way for the practical application of MXenes.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoqi Mao,Yongjin Zou,Fen Xu,Lixian Sun,Hailiang Chu,Huanzhi Zhang,Jian Zhang,Cuili Xiang
The three-dimensional (3D) architecture of electrode materials with excellent stability and electrochemical activity is extremely desirable for high-performance supercapacitors. In this study, we develop a facile method for fabricating 3D self-supporting Ti3C2 with MoS2 and Cu2O nanocrystal composites for supercapacitor applications. MoS2 was incorporated in Ti3C2 using a hydrothermal method, and Cu2O was embedded in two-dimensional nanosheets by in situ chemical reduction. The resulting composite electrode showed a synergistic effect between the components. Ti3C2 served as a conductive additive to connect MoS2 nanosheets and facilitate charge transfer. MoS2 acted as an active spacer to increase the interlayer space of Ti3C2 and protect Ti3C2 from oxidation. Cu2O effectively prevented the collapse of the lamellar structure of Ti3C2–MoS2. Consequently, the optimized composite exhibited an excellent specific capacitance of 1459 F g–1 at a current density of 1 A g–1. Further, by assembling an all-solid-state flexible supercapacitor with activated carbon, a high energy density of 60.5 W h kg–1 was achieved at a power density of 103 W kg–1. Additionally, the supercapacitor exhibited a capacitance retention of 90% during 3000 charging–discharging cycles. Moreover, high mechanical robustness was retained after bending at different angles, thereby suggesting significant potential applications for future flexible and wearable devices.
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Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 19
·3727-3734
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IF 5.958
Zizun Tian,Zhonglu Qi,Yuhao Yang,Hailong Yan,Qianqiao Chen,Qin Zhong
A Ti3C2/CuS composite has been fabricated as a counter electrode for quantum dot-sensitized solar cells by anchoring CuS nanoparticles on Ti3C2via a facile ion-exchange method at room temperature. The accordion-like Ti3C2 is well intercalated and coated with CuS nanoparticles at the optimized ratio of Ti3C2 to CuS. Both electrochemical impedance spectroscopy and Tafel polarization measurements indicate that the composite exhibits a significantly faster electrocatalytic rate towards the polysulfide reduction than pure CuS. The quantum dot-sensitized solar cell-based composite counter electrode displays an overall power conversion efficiency of 5.11% which is 1.5 times that obtained from the CuS counter electrode. The higher power conversion efficiency benefits from the improved short-circuit current density (20.86 mA cm−2), open-circuit voltage (0.56 V) and fill factor (0.45). The enhancement of photovoltaic performance is mainly attributed to the combined advantages of the excellent conductivity of the Ti3C2 skeleton and the abundant catalytically active sites of CuS nanoparticles.
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ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Kaiming Zhang,Jiawen Sun,Jingyao Song,Chuanhui Gao,Zhe Wang,Chengxin Song,Yumin Wu,Yuetao Liu
Flexible conductive composites can be used as wearable strain sensors, which are widely used in the fields of new-generation robotics, electronic skin, and human detection. However, how to make conductive composites that simultaneously possess flexibility, stretchability, self-healing, and sensing capability is challenging research. In this work, we innovatively designed and prepared a silicone polymer conductive composite. MXenes and amino poly(dimethylsiloxane) were modified by small biomolecules via an esterification reaction and a Schiff base reaction, respectively. The modified MXenes are uniformly dispersed, which endows the composite with good electrical conductivity. The reversibility of multiple hydrogen bonds and imine bonds in the composite system makes it have ideal tensile properties and high-efficiency self-healing ability without external stimulation. The conductive composite containing 10 wt % A-MXenes showed an elongation of 81%, and its mechanical strength could reach 1.81 MPa. After repair, the tensile properties and the electrical conductivity could be restored to 98.4 and 97.6%, respectively. In addition, the conductive composite is further evaluated for the value of wearable strain sensors. Even after cut-healed processes, the conductive composite can still accurately detect tiny human movements (including speaking, swallowing, and pressing). This kind of self-healing MXene/PDMS elastomers based on the modification of small biomolecules has great potential as wearable strain sensors. This simple preparation method provides guidance for future multifunctional flexible electronic materials.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 6
·4212-4224
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IF 3.553
Sheng Xinxin,Li Sihao,Huang Haowei,Zhao Yanfeng,Chen Ying,Zhang Li,Xie Delong
Abstract In this work, Ti 3 C 2 MXene, a novel two-dimensional nanosheet, was introduced to waterborne polyurethane (WPU) coatings to prepare a composite coating. First, MAX phase materials were in situ etched by HF acid and further intercalated by water molecules to obtain exfoliated single-layer MXene nanosheet. And then, composite coatings were prepared via solution-blending low addition (0–0.4 wt%) of MXene, self-prepared waterborne polyacrylate emulsion (PAE) and isocyanate hardener, applying on Q235 mild steel. Results of AFM, XRD SEM and SEM–EDS confirm that single-layer MXene nanosheets with large lateral-to-thickness ratio are successfully prepared and achieved homogenous distribution within WPU matrix. With 0.4 wt% MXene incorporated, the WPU/Ti 3 C 2 MXene composite coatings reach a lowest corrosion current of 2.143 × 10 –6 A/cm 2 , a decrease of one order of magnitude compared with blank WPU (1.599 × 10 –5 A/cm 2 ) and own an excellent UV-blocking property (almost block the whole UV light). Graphical abstract
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
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2020
·Vol. 217
·期 8
·1900806
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IF 1.759
Jingbo Li,Yu Liu,Fang Xu,Junping Hu,Nan Chen,Guoping Du,Changshuang Jiang
As a 2D material, Ti 3 C 2 (MXene) has been recently used as electrodes for electrochemical capacitors. Herein, a two-step procedure is used to obtain a highly opened layer structure for Ti 3 C 2 , which differs from the methods used in the literature for synthesizing exfoliated MXene. First, the mild NH 4 HF 2 etching agent is used to prepare the regular Ti 3 C 2 MXene. Second, KOH is added into the obtained solution for K + to intercalate the MXene. The K + intercalation is found to greatly increase the (002) crystal planar spacing of the Ti 3 C 2 from 10.8 to 12.4 Å. More importantly, this K + -intercalated MXene exhibits a highly opened layer structure, whereas the regular MXene only has a partially opened layer structure. Consequently, the former is expected to allow much more active sites exposed to liquid electrolyte, and also facilitates remarkably higher ion and electron transport efficiency. To investigate their electrochemical capacitance properties, the regular and K + -intercalated Ti 3 C 2 MXenes are used to fabricate binder-free electrodes on nickel foams by an electrophoretic deposition method. The K + -intercalated MXene-based electrode is found to have twice higher specific capacitance than the regular MXene. Furthermore, the K + -intercalated Ti 3 C 2 MXene-based electrode exhibits an excellent cyclic stability.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Fanrong Ai,Chaojun Fu,Guojun Cheng,Huanhuan Zhang,Yingchun Feng,Xiluan Yan,Xiangjuan Zheng
As an emerging zero-dimensional nanomaterial, MXene quantum dots (MQDs) have aroused the interest of researchers because of their unique physical and chemical characteristics. Here, a straightforward hydrothermal strategy was used to successfully produce the amino-functionalized Ti3C2 MQDs. The functionalized Ti3C2 MQDs exhibited bright blue fluorescence (FL), which was derived from its size effect and surface defects. In addition, Ni2+ can bind to the amino groups on the surface of Ti3C2 MQDs. The absorption of the excitation light by the light-absorbing substance causes nickel ions to effectively quench the photoluminescence of Ti3C2 MQDs, which can be explained by the internal filter effect (IFE). At the same time, the strong affinity of histidine (His) for Ni2+, which is absorbed by His to form a stable complex, causes Ni2+ to dissociate from the Ti3C2 MQD surface and restore the FL. Thus, a fluorescent sensor for detecting the His content in serum was developed. Overall, this work provides a method for the detection of His and shows that the Ti3C2 MQDs have great potential in biomedical and biosensing applications.
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Soft Matter
·
2019
·Vol. 16
·期 1
·162-169
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IF 3.399
Peng Zhang,Xiu-Jie Yang,Peng Li,Yingyuan Zhao,Qingshan Jason Niu
A highly stretchable nanocomposite (NC) hydrogel was fabricated via in situ free radical polymerization of acrylamide. In particular, an exfoliated two-dimensional MXene (Ti3C2) nanosheet was utilized as a crosslinker instead of traditional organic crosslinkers. The exfoliated Ti3C2 nanosheets were confirmed by atomic force microscopy (AFM) and dynamic light scattering (DLS) measurements. Compared with traditional organic crosslinked N,N-methylene bisacrylamide (BIS)/polyacrylamide (PAM) hydrogels (fracture strength of 32.0 kPa and elongation of 109.6%), the synthesized Ti3C2/PAM NC hydrogels exhibited greatly improved mechanical properties with fracture strengths of 66.5 to 102.7 kPa, compressive strengths of 400.6 to 819.4 kPa and elongations at break of 2158.6% to 3047.5% as the Ti3C2 content increases from 0.0145% to 0.0436%. The enhanced mechanical performances can be attributed to the honeycomb-like fine structure with uniform pores as well as more flexible polymer chains in NC hydrogel networks. When loaded with drugs, Ti3C2/PAM NC hydrogels exhibited good sustained-release performance, higher drug loading amounts (97.5–127.7 mg g−1) and higher percentage releases (62.1–81.4%), greatly superior to those of the BIS/PAM hydrogel (46.4 mg g−1, 45.0%). Our work reveals the application of MXene materials in the fabrication of NC hydrogels with enhanced mechanical and drug release behaviors.
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ACS Applied Nano Materials
·
2019
·
IF 0
Lu Liu,Guobing Ying,Cong Hu,Kaicheng Zhang,Fengchen Ma,Lin Su,Chen Zhang,Cheng Wang
MXene is a two-dimensional transition metal carbide or carbonitride with graphene-like 2D morphology and high surface activity, which are useful features in energy storage, catalysis, and adsorption. However, only a handful of structural applications have so far been reported. In this study, functionalization of a carbon fiber (CF) was achieved by MXene (Ti3C2) to improve the CF surface wettability. The results showed that functionalization of MXene not only changed the CF surface topography and increased the mechanical engagement effect during debonding but also enhanced the surface activity of carbon fibers. The interfacial shear strength increased by 186% when compared with nonfunctionalized specimens. A possible interfacial enhancement mechanism was proposed to provide a future roadmap for surface modification of carbon fibers.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Jianian Chen,Mingyu Chu,Fenglei Lyu,Jin Gong,Linzhong Wu,Lijia Liu,Yong Xu,Qiao Zhang
Two-dimensional (2D) metal carbides, carbonitrides, and nitrides (MXenes) have recently emerged as promising candidates in catalysis due to their unique properties. In this work, we composited Ti3C2 with Co-embedded N-doped carbon nanotubes (CNTs) via the pyrolysis of zeolitic imidazolate frameworks (ZIF-67) for propyne selective hydrogenation. Detailed characterizations show that strong synergistic effects are observed between the Ti3C2 and Co-embedded N-doped CNTs in the composite catalysts. This work provides an efficient strategy to achieve N-doping on Co nanoparticles, which play a vital role in the propyne selective hydrogenation. The optimized catalyst gives a high propyne conversion (∼99%) and high propene selectivity (∼96%) on propyne selective hydrogenation at 150 °C, which surpasses the reported non-noble metal catalysts in literature works. This work may not only open an avenue for obtaining active and selective catalysts for propyne selective hydrogenation but also promote research on the role of MXenes in catalysis.
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