Electronic Materials Letters
·
2022
·Vol. 19
·期 1
·94-107
·
IF 3.151
Luo Menghao,Feng Hange,Hu Yuechuan,Chen Keke,Dong Zibo,Xue Shaolin
Abstract Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55 times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jun Han,Junhui Shao,Xingchen He,Najun Li,Shuxian Wang,Dongyun Chen,Jianmei Lu
Constructing heterojunctions has been proved to effectively improve the carrier transfer capability for enhanced catalytic activity. Herein, Ti 3 C 2 /BaTiO 3 heterojunctions were fabricated through self-assembly driven by hydrogen bonding between piezoelectric barium titanate (BaTiO 3 ) stabilized by oleic acid molecules and titanium carbide (Ti 3 C 2 ) with surficial functional groups under continuous ultrasonic vibration. Owing to the formation of heterojunction, the separation of free charges can be promoted by the conductive Ti 3 C 2 . Additionally, the recombination of electrons and holes pairs in BaTiO 3 can be hindered by built-in piezoelectric field. Hence, the piezocatalytic activity of Ti 3 C 2 /BaTiO 3 was significantly enhanced by the accumulated piezoelectric effect, maintaining stability during the piezocatalytic degradation of bisphenol A and achieving rate constants that were 22.2 and 3.2 times higher than those of Ti 3 C 2 and BaTiO 3 , respectively. This work thus presents a novel strategy for designing high-activity heterojunction piezocatalysts through hydrogen bonding self-assembly.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 16
·4068-4074
·
IF 5.256
Xinliang Li,Xiaowei Yin,Meikang Han,Changqing Song,Hailong Xu,Zexin Hou,Litong Zhang,Laifei Cheng
Ti3C2Tx MXenes modified with in situ grown carbon nanotubes (CNTs) are fabricated via a simple catalytic chemical vapor deposition (CVD) process. The as-prepared Ti3C2Tx/CNT nanocomposites show that one-dimensional (1D) carbon nanotubes are uniformly distributed in the interlayers of two-dimensional (2D) Ti3C2Tx MXene flakes. Compared with the pristine Ti3C2Tx MXenes, the hierarchical sandwich microstructure makes a contribution to the excellent electromagnetic wave absorption performance in the frequency range of 2–18 GHz, including higher absorption intensity (the minimum reflection coefficient reaches −52.9 dB, ∼99.999% absorption), broader effective absorption bandwidth (4.46 GHz), lower filler loading (35 wt%) and thinner thickness (only 1.55 mm). In addition, with the adjustment of thickness from 1.55 to 5 mm, the effective absorption bandwidth can reach up to 14.54 GHz (3.46–18 GHz). Different absorption mechanisms mainly based on polarization behaviors and conductivity loss are discussed. This work not only proposes the design of a novel electromagnetic wave absorber, but also provides an effective route for extending further the applications of 2D MXene materials in the field of electromagnetic wave absorption.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Ligang Ma,Le Xu,Yihuan Ding,Chao Lin,Yuqing Yang,Xiaoqian Ai
Reasonable design and preparation of effective interface engineering to accelerate charge transfer is the key to achieve the improvement of heterojunction photocatalysts. In this study, a Ti 3 C 2 -MoS 2 -ZnIn 2 S 4 (TMZ) heterojunction was designed and successfully synthesized by sequentially growing MoS 2 and ZnIn 2 S 4 layered structures on highly conductive Ti 3 C 2 using a two-step hydrothermal method. This configuration effectively separated photogenerated carrier, thereby improving the efficiency of photocatalytic hydrogen production. The effects of the amount of Ti 3 C 2 -MoS 2 on the microstructure, morphology, optical properties and photocatalytic H 2 production of TMZ heterojunctions were investigated. Results demonstrated that Ti 3 C 2 , MoS 2 , and ZnIn 2 S 4 intricately interpenetrated to form a tightly bound TMZ heterojunction with a well-defined heterojunctions interface. This interface is beneficial for the separation of photogenerated carriers, thereby boosting the photocatalytic performance. The dynamic process of carrier separation was investigated in detail using photocurrent measurements, EIS Nyquist plots, photoluminescence, and fluorescence lifetime analysis. Additionally, compared to pristine ZnIn 2 S 4 , the absorption edge of TMZ sample exhibited a redshift, indicating an expanded absorption range in the visible spectrum. Finally, the mechanism by which TMZ enhances the efficiency of photocatalytic H 2 production is thoroughly analyzed.
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MOLECULES
·
2024
·Vol. 29
·期 21
·5096
·
IF 4.2
Tao Tang,Xiaoyu Dou,Haoran Zhang,Hexu Wang,Ming Li,Guanghui Hu,Jianfeng Wen,Li Jiang
In recent years, halide perovskite materials have become widely used in solar cells, photovoltaics, and LEDs, as well as photocatalysis. Lead-free perovskite Cs 3 Bi 2 I 9 has been demonstrated as an effective photocatalyst; however, the fast recombination of the photogenerated carriers hinders further improvements of its photocatalytic activity. In this work, Ti 3 C 2 was composited with Cs 3 Bi 2 I 9 to promote the transfer and separation of photogenerated carriers, and thus the pollutant degradation efficiency was effectively improved. The visible-light photocatalytic reduction of Cs 3 Bi 2 I 9 /Ti 3 C 2 on rhodamine B (RhB), methylene blue (MB), and malachite green (MG) was as high as 97.3%, 96%, and 98.8%, respectively, improvements of almost 31.2%, 37.8%, and 37.2% compared to that of sole Cs 3 Bi 2 I 9 . Our study provides a simple way to enhance the photocatalytic activity of lead-free halide perovskites.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Huixin Zhang,Rui Zhao,Feifei Zhang,Jianfei Xia,Zonghua Wang
Chloramphenicol (CAP) is known to be harmful to the environment and food, posing a threat to human health. Developing an effective and convenient method for detecting CAP is crucial. An electrochemiluminescence (ECL) biosensor has been designed for sensitive detection of CAP. The improved ECL behavior was attributed to the synergistic effect of N and P co-doped Ti 3 C 2 -Apt1 (N, P-Ti 3 C 2 -Apt1) nanoprobes and high intensity focused ultrasound (HIFU) pretreatment. The doping of N and P could improve the electrochemical performance of Ti 3 C 2 . HIFU pretreatment generated more reactive oxygen species (ROS) in the luminol-O 2 system. N, P-Ti 3 C 2 could aggregate and catalyze ROS, causing an increase in ECL intensity. Furthermore, N, P-Ti 3 C 2 as a carrier loaded more aptamer, which could recognize CAP with high specificity. The detection limit was 0.01 ng/mL. This biosensor has been successfully applied in milk and environmental water samples, highlighting its potential in the field of food and environmental analysis.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Yu Han,Li-Hui Sun,Bo Cai,Ming Xia,Chun-Quan Zhu,Dong-Song Li
Large bone defects are a major clinical challenge in bone reconstructive surgery. 3D printing is a powerful technology that enables the manufacture of custom tissue-engineered scaffolds for bone regeneration. Electrical stimulation (ES) is a treatment method for external bone defects that compensates for damaged internal electrical signals and stimulates cell proliferation and differentiation. In this study, we propose a simple, reliable, and versatile strategy to prepare multifunctional 3D printed scaffold combined with ES for bone defect therapy. Firstly, scaffolds composed of polycaprolactone (PCL) and Ti 3 C 2 were prepared by 3D printing technology, and then a stromal cell derived factor 1 (SDF1) containing DOPA tag was loaded onto the scaffold surface. Ti 3 C 2 was selected as the electrode component because of its excellent electrical conductivity. The selection of DOPA-modified SDF-1(DOPA-SDF1) can improve the material binding ability and exert long-term stem cell recruitment function. The results show that prepared 3D printed scaffold (DOPA-SDF1@PCL#Ti 3 C 2 ) has good hydrophilicity, electrical conductivity, antibacterial property, biocompatibility and stem cell recruitment ability. Furthermore, the expression of osteogenic specific genes in scaffold surface cells was significantly increased when pulse ES (PES) treatment was applied. The results of tibial plateau defect repair experiment showed that DOPA-SDF1@PCL#Ti 3 C 2 scaffold can significantly promote the formation of new bone and collagen fibres. When the DOPA-SDF1@PCL#Ti 3 C 2 scaffold was used in combination with PES therapy, the bone defect regeneration rate was further improved. This kind of scaffold could provide a new strategy for promoting the healing of large bone injuries and could expand the application of adjuvant therapy such as PES.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-10
·
IF 5.3
Yang Xiao,Li Chunguang,Xia Jianfei,Zhang Feifei,Wang Zonghua
A three-dimensional (3D) self-assembled AuNPs/Ti 3 C 2 MXene hydrogel (AuNPs/Ti 3 C 2 MXH) nanocomposite was prepared for the fabrication of a novel microRNA-122 electrochemical biosensor. The 3D hydrogel structure was gelated from two-dimensional MXene nanosheets with the assistance of graphite oxide and ethylenediamine. MXene hydrogels supported the in situ formation of Au nanoparticles (AuNPs) that predominantly exploring the (111) facet, and these AuNPs are utilized as carriers for hairpin DNA (hpDNA) probes, facilitating DNA hybridization. MXene acted as both a reductant and stabilizer, significantly improving the electrochemical signal. In addition, the conjugation of PAMAM dendrimer-encapsulated AuNPs and H-DNA worked as an ideal bridge to connect targets and efficient electrochemical tags, providing a high amplification efficiency for the sensing of microRNA-122. A linear relationship between the peak currents and the logarithm of the concentrations of microRNA-122 from 1.0 × 10 −2 to 1.0 × 10 2 fM (I = 1.642 + 0.312 lg c , R 2 = 0.9891), is obtained. The detection limit is 0.8 × 10 −2 fM (S/N = 3). The average recovery for human serum detection ranged from 97.32 to 101.4% (RSD < 5%). Graphical Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Kunxian Chen,Qian Zhou,Yujie Fu,Hao Wang,Xiaolian Wang
Pristine Nb 2 C/Ti 3 C 2 dual MXenes enable composition-controlled MgH 2 catalysis. • A 1:2 Nb 2 C/Ti 3 C 2 ratio is optimal at only 5 wt% total catalyst loading. • 6.81 wt% H 2 is released within 3 min at 300 °C. • 4.56 wt% H 2 is absorbed within 20 s at 50 °C under 55 bar H 2 . • 91%/90% capacity is retained after 30 hydrogenation/dehydrogenation cycles. MXene catalysts can improve MgH 2 kinetics, but composition effects in dual pristine MXenes at fixed loading remain unclear. Here, Nb 2 C/Ti 3 C 2 was optimized by Nb 2 C etching time, single-MXene loading, mass ratio, and total loading. Nb 2 C etched for 70 h showed low residual Al, intact layers, and the highest surface area. At 5 wt% total catalyst, Nb 2 C:Ti 3 C 2 = 1:2 gave the best overall performance. It released 6.81 wt% H 2 in 3 min at 300 °C and 6.02 wt% in 10 min at 250 °C, and absorbed 4.56 wt% H 2 in 20 s at 50 °C under 55 bar H 2 . The apparent dehydrogenation activation energy was 71.25 ± 8.73 kJ·mol −1 , 53.7% below the MgH 2 reference. After 30 cycles, hydrogenation/dehydrogenation capacity retentions were 91%/90%. XRD and SEM confirmed reversible MgH 2 /Mg conversion and cycling-related morphology changes. XPS survey of the optimized dual-MXene composite confirmed the coexistence of Ti- and Nb-containing species, while reaction-state XPS of the individual Ti 3 C 2 - and Nb 2 C-containing composites showed reaction-dependent surface reconstruction. Together, these results support composition-dependent catalytic contributions, whereas simultaneous Ti-Nb reconstruction in the optimal dual system remains unverified.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122789
·
IF 7.5
Dancheng Zhu,Caiyun Zhang,Jiabin Shen,Chao Shen,Chuanhong Jin,Hao Xu
Sulfamethoxazole (SMX), a widely used sulfonamide antibiotic, is a persistent aquatic pollutant due to its resistance to conventional treatment. Here, a Cu-ZSM-5/Ti 3 C 2 composite catalyst was fabricated by electrostatic self-assembly for peroxymonosulfate (PMS) activation. Characterization by XRD, SEM, TEM, XPS, and zeta potential analysis confirmed the successful integration of the components. The catalyst achieved 97.59% removal of 10 mg/L SMX within 30 min. Quenching and EPR results indicated that 1 O 2 was the major reactive species. The enhanced performance under alkaline conditions was associated with the negatively charged composite surface (-38.8 mV at pH 9), the deprotonated state of SMX, and favorable interfacial interactions that may promote preferential oxidation of the isoxazole moiety. Control experiments using a physically mixed sample showed markedly lower activity, especially at pH 11, highlighting the importance of the intimate heterointerface created by self-assembly. The superior activity was attributed to the synergistic interaction between Cu species in Cu-ZSM-5 and Ti-based sites in Ti 3 C 2 . This work provides insight into designing selective PMS activation catalysts for antibiotic-contaminated water treatment.
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Green Energy & Environment
·
2025
·
IF 14.6
Yu Liu,Mengjie Pan,Mengqin Gong,Huachen Lin,Yulong Ying,Longhua Li,Hong Jia
Supercapacitors are indispensable for next-generation energy storage, achieving high energy density and long-term durability remains a formidable challenge. Conventional CoS suffers from poor conductivity, while Ti 3 C 2 faces severe restacking. Herein, we report a novel synthesis strategy that integrates metal-organic framework (MOF) growth with electrostatic self-assembly to construct heterojunction of CoS nanotubes coated with ultrathin Ti 3 C 2 nanofilms. Material characterization via SEM, TEM, XRD, and XPS systematically confirms the heterostructure formation, and chemical composition. This rational design synergistically leverages CoS high pseudocapacitance and Ti 3 C 2 metallic conductivity while the heterostructure mitigates restacking, enhances charge transfer, and stabilizes interfacial interactions. Density functional theory (DFT) calculations reveal strengthened OH - adsorption at the Co-Ti interface (E ad = 1.106 eV). Consequently, the CoS/Ti 3 C 2 @CC delivers a remarkable specific capacitance of 1034.21 F g -1 at 1 A g -1 . Assembled into a supercapacitor, CoS/Ti 3 C 2 @CC//AC achieves a high energy density of 74.22 Wh kg -1 at 800 W kg -1 , maintaining 89.13% initial capacitance after 10,000 cycles. Significantly, it exhibits a remarkably low leakage current (0.23 μA) and ultra-prolonged voltage retention (47.14% after 120 h), underscoring exceptional durability. This work pioneers a rational heterostructure engineering strategy by integrating MOF-derived architectures with conductive MXene nanofilms, offering critical insights for the development of ultra-durable supercapacitor.
研究领域:
储能
·
材料科学
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纳米技术
·
电化学
·
凝聚态物理
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ACS Sensors
·
2025
·
IF 9.1
Meiling Lian,Kexin Luan,Tianlun He,Da Chen
The integration of gas sensors with small unmanned aerial vehicles (UAVs) has attracted widespread attention in atmospheric chemistry, industrial emission monitoring and environmental protection. However, conventional metal oxide semiconductor gas sensors currently installed on UAVs exhibit issues such as inadequate sensitivity, long response times, and unsatisfactory stability. In this direction, NiCo2O4 inserted two-dimensional layered Ti3C2 MXene have synthesized using a facile hydrothermal method for CO detection. The density functional theory (DFT) calculations were first employed to explore CO adsorption behaviors, revealing that the adsorption energy of gas molecules is significantly reduced after the combination of NiCo2O4 and MXene. The optimized MXene incorporation effectively prevents nanoparticle agglomeration, significantly increasing the specific surface area and exposing abundant active sites for gas adsorption. As a result, the hybrid sensor exhibited more than five times higher response toward 100 ppm CO at 110 °C with shorter response time (39 s) than pristine NiCo2O4. Through in situ Raman spectroscopy analysis, we elucidated the rapid adsorption–desorption of gas molecules on heterostructures. Furthermore, we successfully implemented the developed NiCo2O4/Ti3C2 MXene sensor on a compact drone platform, enabling real-time three-dimensional spatial mapping of CO concentrations. This work not only advances the design of high-performance gas sensing materials but also showcases the practical viability of drone-mounted MXene sensors for real-time 3D air quality mapping, paving the way for smart environmental monitoring systems.
研究领域:
气体传感
·
材料科学
·
环境监测
·
纳米技术
·
大气化学
·
航空航天工程
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