RSC Advances
·
2023
·Vol. 13
·期 49
·34808-34816
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IF 3.9
Zishan Hu,Yuanlin Li,Aijun Li,Hai-Hua Wang,Xiao-Feng Wang
Establishing stable and efficient Pt-free counter electrodes (CEs) is an important challenge for dye-sensitized solar cells (DSSCs). Ti3C2Tx MXene, with its high catalytic activity and conductivity, has gained attention as a CE in DSSCs. The focus of this paper is on the preparation of Ti3C2Tx decorated carbon nanotubes (CNTs) composite electrode materials (CNTs/Ti3C2Tx), and testing their performance as CEs in DSSCs. Through a series of electrochemical tests, a CNTs/Ti3C2Tx CE exhibits good electrocatalytic activity toward iodine-based electrolytes with low charge transfer resistance, which is close to the performance of a Pt CE. The photoelectric conversion efficiency (PCE) of the CNTs/Ti3C2Tx (1.0 wt%) CE-based DSSCs reaches 5.83%, which is much higher than that of the CNTs CE (3.70%), and approximates that of the Pt CE (6.61%). We attribute the improved performance to the synergistic effect of the excellent conductivity and unique two-dimensional chemical structure of Ti3C2Tx MXene. Moreover, the photostability test of continuous light exposure shows that the CNTs/Ti3C2Tx-1.0 wt% (C/T-1.0 wt%) CE exhibits good stability to the electrolyte. Therefore, CNTs/Ti3C2Tx composites can be used as an efficient Pt-free CE for DSSCs in the future.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Minying Wu,Jianqiang Yang,Tong Ye,Baoxin Wang,Yi Tang,Xinjiang Ying
Ti3C2Tx MXene is a versatile two-dimensional material that exhibits exceptional properties, such as an abundance of surface functional groups that facilitate modifications. Additionally, Ti3C2Tx MXene possesses remarkable photothermal effects. In this study, ultrathin Ti3C2Tx nanosheets with dimensions (∼200 nm) suitable for biological applications were prepared by ultrasonication of larger pieces of Ti3C2Tx MXene with a cell pulverizer operating at a specific power. The ultrathin nanosheets exhibited a significant photothermal conversion efficiency (47.1%) under an 808 nm infrared laser irradiation. In addition, they showed an excellent mass extinction coefficient of 15.7 L g–1 cm–1. By exploiting the intermolecular force between these ultrathin nanosheets and doxorubicin (DOX), a drug loading efficiency of 72.8% was achieved. Through layer-by-layer surface modification of a sulfhydryl-modified polymethacrylic acid (PMAsh) shell and a transferrin (Tf) layer with targeting function, a multifunctional nanomedicine platform (Ti3C2Tx-DOX-PMAsh-Tf) was constructed. Experiments executed in vitro with cells and in vivo to inhibit tumors manifested that Ti3C2Tx is biocompatible. Furthermore, the results showed that the drug release behavior of Ti3C2Tx-DOX-PMAsh-Tf is responsive to glutathione (GSH) stimulation. The synergistic treatment of photothermal therapy and the anticancer drug DOX effectively achieved the inhibition of human hypopharyngeal squamous cell carcinoma.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Di Zhang,Bing Zhao,Lijie Liu,Hao Tang,Xiangxue Wang,Shujun Yu
Although two-dimensional transition metal carbides and carbonitrides (MXenes) are becoming increasingly popular in contaminant remediation field, the preparation of MXene nanosheets that can efficiently eliminate the target pollutants still deserves in-depth investigation. Here we produced amidoxime Ti 3 C 2 T x nanosheets (TC-AO), which were efficient radionuclide adsorbents with high stability and positive affinity, by introducing the amidoxime group into the Ti 3 C 2 T x MXene surface through grafting by diazonium salt. The high stability and abundant functional groups of TC-AO were demonstrated by different characterization techniques such as scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and X-ray photoelectron spectroscopy (XPS). Multiple factors affecting the radionuclide removal performance were explored, including reaction time, temperature, pH, ionic strength, anions and cations. The experimental results demonstrated that the radionuclide uptake by TC-AO was a heat-absorbing, spontaneous single-molecule chemisorption process and was consistent with the pseudo-secondary and Langmuir models. When pH < 6, the mechanism of uranium removal was inner complexation, and as the pH continued to increase, uranium removal shifted to outer complexation. Furthermore, the results certificated that TC-AO exhibited fast reaction kinetics (reaching equilibrium in about 20 min), excellent removal efficiency (279.57 mg U·g −1 and 73.99 mg Eu·g −1 ), outstanding selectivity and good stability. The studies showed that TC-AO had good stability and functionality, which was not only valuable for the design of MXene based adsorbents, but also provided a meaningful option for the extraction of radioactive pollutants from wastewater.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
·
IF 10.319
Kunpeng Qian,Shuang Li,Jianhui Fang,Yuhuan Yang,Shaomei Cao,Miao Miao,Xin Feng
Ti 3 C 2 T x MXenes with excellent metallic conductivity and flexibility have shown a promising prospect as electromagnetic interference (EMI) shielding materials. Ultrathin, hierarchical hybrid films were fabricated by using C 60 intercalating Ti 3 C 2 T x MXenes with the assistance of water-soluble γ -cyclodextrin (CD). The C 60 /CD complex was obtained by high-speed vibration milling using hydrophilic CD as dispersing agent. After thermal annealing treatment, the obtained hybrid film exhibited excellent EMI shielding (53.52±0.43 dB), hydrophobicity (water contact angle: 93.7°) and mechanical stability (over 0.9 million bending times). Taking advantage of the antioxidant of C 60 , the chemical durability of Ti 3 C 2 T x MXenes based hybrid films was also improved as expected. These results indicate that the well-designed hierarchical hybrid films with the intercalation of C 60 have promising potential for high-performance EMI shielding applications.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhenguo Wang,Ke Yu,Yu Feng,Ruijuan Qi,Jie Ren,Ziqiang Zhu
MXenes, a new class of two-dimensional materials, possessing high electrical conductivity and unique surface properties，have exhibited great potential as non-noble metal catalyst for hydrogen evolution reaction (HER). However, due to poor oxidation resistance , they are easily oxidized in aqueous solution and high humidity environment, resulting in a great loss of electronic properties and surface reactivity. Herein, we report a simple and effective composite synthesis strategy with TiOF 2 intercalation to improve the stability of MXenes materials. TiOF 2 @Ti 3 C 2 T x prepared by this strategy shows ultra-long catalytic activity life of 1000 cycles in acid electrolyte. Besides，the catalyst also shows high HER activity with a low onset potential of 103 mV and a Tafel slope as low as 56.2 mV dec − 1 . Benefiting from the stabilization of TiOF 2 and the physicochemical properties of Ti 3 C 2 T x , TiOF 2 @Ti 3 C 2 T x also exhibits excellent humidity sensitivity and stability.
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Zhanbin Feng,Guofei Feng,Xinchen Yue,Xing-Hong Zhang
Dielectric elastomers (DEs) with high actuated strains at low electric fields have been a great challenge over the past few decades. In this work, we report the preparation of poly(thioether) grafted Ti 3 C 2 T x MXene DE nanocomposites (MXeneK-FGE-BMI) with high area strain at low driving voltage (17.1 %@11.9 V/μm) by two steps: the pretreated MXene (MXeneK) initiated decarboxylative ring-opening polymerization (ROP) of furfuryl glycidyl ether (FGE) and carbonyl sulfide (COS), followed by the Diels-Alder (DA) crossslinking reaction between furan groups and bismaleimide (BMI). The grafting of poly(thioether) chains onto the MXeneK surfaces enables MXeneK well dispersed in the matrix, leading to the significant decrease of dielectric loss (tan δ, below 0.04@10 3 Hz). Low content of MXeneK (below 1.0 wt%) resulted in high ε’ (∼12.3@10 3 Hz) and low elastic modulus (Y, below 0.5 MPa). Therefore, the resultant DE nanocomposite present a high area strain of 17.1 % at a driving voltage of 11.9 V/μm, superior to the previous reports (0.7 %∼10 %@12 V/μm). This work provides a facile strategy to prepare DE nanocomposites with excellent electromechanical performances at low driving voltage.
研究领域:
材料科学
·
高分子化学
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纳米技术
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 6
·1788-1798
·
IF 6.177
Jing Zhao,Yanzhuo Zhang,Hucheng Zhang,Haiyan Wang,Jianji Wang
Hydrogen spillover is an important theme for hydrogen storage and H-involving catalytic reactions. This work shows that catalytic reactivity and selectivity can be revealed by differentiating the energetic characteristics of spilled H species. With the assistance of Ti, F and C in MXenes, Pd1.8Ni@Ti3C2Tx presents a high capacity for spillover hydrogen storage at ambient temperatures, and the rich oxygenated groups act as the main carriers of hydrogen spillover around metal nanoparticles. Thermodynamic analysis reveals that the catalytic performances are energetically dominated by the adsorption enthalpies of the active spilled H species rather than the amount of spillover hydrogen, and can be tuned by alloying and surface modification. The ideas are verified from the excellent catalysis, chemoselectivity and stereoselectivity of Pd1.8Ni@Ti3C2Tx in semihydrogenations. The strategy of maximizing catalytic performances is applicable to other Pd-based bimetals@Ti3C2Tx, such as Pd2.6Co@Ti3C2Tx and Pd1.5Fe@Ti3C2Tx, and provides new energetics perspectives to understand the catalytic mechanism in spillover-involving chemical procedures.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Zhihui Wu,Da-Wen Sun,Hongbin Pu,Qingyi Wei,Xuanran Lin
Mycotoxin B1 (AFB1) contamination in agricultural products pose a deadly danger to animal and human health and its rapid and reliable detection is thus very important. Herein, a ratiometric surface-enhanced Raman scattering (SERS) aptasensor for AFB1 detection was developed, in which 1,2-bis(4-pyridyl) ethylene (BPE) was used to trigger the assembly of Au nanoparticle dimers (AuNP dimers) and form intensive SERS “hot spots”, and MXenes nanosheets could load aptamer-modified AuNP dimers due to the hydrogen bonding and the chelation between the phosphate groups of aptamers and the Ti ion of MXenes. With the presence of AFB1 preferentially binding to AFB1 aptamer, AuNP dimers were separated from MXenes nanosheets, leading to a decrease in SERS intensity. Regression analysis in the range from 0.001 to 100 ng·mL −1 showed the limit of detection (LOD) being 0.6 pg·mL −1 in standard solution, indicating that the great prospects of the AuNP dimers/MXenes SERS substrate for detecting AFB1.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengqian Li,Shengyuan Wang,Siwen Yang,Xiaoran He,Jiaxing Yang,Shuhao Zheng,Wen Luo,Haoran An
MXenes are considered ideal electrode materials. However, the cumbersome and poorly efficient preparation of few-layer MXenes, whereas the electrochemical performance of the more easily producible multi-layer MXenes is fundamentally constrained by severe interlayer stacking. In this work, the (002) facet orientation of multi-layer Ti 3 C 2 T x was modified via a solvothermal process, resulting in substantially enhanced electrochemical properties. The texture coefficients of (002) facet (TC (002) ) in multi-layer Ti 3 C 2 T x increases with increasing solvothermal temperature. Moreover, the specific capacitance was calculated to be approximately proportional to TC (002) , and HMX-180 reached a capacity of 310.2 F g −1 at a current density of 1 A g −1 . Density functional theory (DFT) calculations revealed that the (002) facets have the minimum adsorption energy for H + and a higher Fermi energy level, indicating that the (002) facets are more likely to be enriched with H + and exhibit higher electrical conductivity. These features promote the rapid transport of H + between the Ti 3 C 2 T x layers. Furthermore, multi-layer Ti 3 C 2 T x prepared via MILD method also undergoes (002) facet orientation and corresponding performance enhancement through this approach. This work provides a universal and scalable approach for fabricating high-performance MXene electrodes, which holds considerable promise for developing next-generation supercapacitors for practical applications in portable electronics and sustainable energy systems. This strategy also offers considerable potential for application in other energy storage systems, including metal-ion batteries, and catalytic devices.
研究领域:
材料科学
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储能技术
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电化学
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纳米材料
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超级电容器
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yixuan Xia,Jiating Li,Gangbing Zhu,Yinhui Yi
Anodic stripping voltammetry (ASV) is presently the most widely used method for mercury ion (Hg 2+ ) detection, but it generally needs an electrodeposition step. As a new star nanomaterial , MXenes shows greatly important applications in electrochemical sensing. In this work, by preparing Ti 3 C 2 T x MXenes nanoribbons/carbon nanotube (Ti 3 C 2 T x R/CNT) nanohybrids to modify glassy carbon electrode (GCE) as sensing platform, an innovative strategy without electrodeposition was proposed for the sensitive detection of Hg 2+ . The results show that Ti 3 C 2 T x R exhibits spontaneous adsorption and reduction capability towards Hg 2+ , which can make Hg 2+ self-reduced and preconcentrated on the electrode surface . Coupled with the excellent electronic properties of CNT, an electrodeposition-free and sensitive ASV sensor was constructed, and Ti 3 C 2 T x R/CNT/GCE can exhibit superior sensing performances for Hg 2+ analysis with a low detection of limit (5.2 nM) and wide linearity range (0.01–7.0 μM). This work offered a new direction for MXenes nanomaterials and Hg 2+ detection.
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Journal of Physical Chemistry C
·
2020
·
IF 4.189
Zilong Zhang,Yaoyi He,Yangyang Lv,Lei Zhang,Xiqiao Chen,Zhuang Wu,Yanhong Zou
In this paper, two-dimensional Ti3C2Tx-MXenes with abundant defects and functional groups as well as appropriate conductivity were successfully synthesized by acid treatment at room temperature. The relationship between the surface structure and its electromagnetic wave absorption ability was systematically studied by changing etching time and heat treatment. Benefiting from the conduction loss and strong polarization relaxation around the abundant interface areas in the two-dimensional layered structure, the Ti3C2Tx Mxene composite possesses excellent electromagnetic absorption performance. Remarkably, optimized Ti3C2Tx exhibits extremely strong absorption with a minimum reflection coefficient of −65 dB, and the qualified absorbing bandwidth is up to 5 GHz. Furthermore, the ultrathin matching thickness of the Ti3C2Tx Mxene composite is 1.4 mm. The prominent absorbing performance outperforms most recently reported two-dimensional carbon materials for microwave absorption.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yong Zhao,Yixuan Xia,Juerui Zhang,Hongde Liu,Yinhui Yi,Gangbing Zhu
In this work, based on the unique self-adsorption and reduction capacities of Ti 3 C 2 T x MXenes toward silver ion, silver nanoparticles (Ag NPs) as reference probe are synthesized and immobilized on the surface of Ti 3 C 2 T x nanoribbons (Ti 3 C 2 T x R) to form Ag-Ti 3 C 2 T x R nanohybrid with a simple stirring-method, and carbon nanotubes (CNTs) are introduced to conjugate Ag-Ti 3 C 2 T x R for inhibiting their aggregation and improving further the sensing performance. Via selecting paracetamol (PA) as a model analyte, a ratiometric voltammetric sensing strategy is proposed by using Ag-Ti 3 C 2 T x R/CNTs as electrode materials on the basic of the collaborative advantages of Ag NPs, Ti 3 C 2 T x R and CNTs: in the absence of PA, Ag-Ti 3 C 2 T x R/CNTs modified electrode displays only an electrochemical signal from the oxidation of Ag 0 ; while in the presence of PA, a varied signal of PA along with its concentration can be observed coupled with a quite stable oxidation signal of Ag 0 . Based on this principle, a highly sensitive and reliable ratiometric sensing platform is designed for PA detection by recording the ratio of signals between PA and Ag 0 . It’s expected that this work exploits a new research field in electrochemical sensors by combining the synthetic advantages of MXenes and metal elements.
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