CHEMICAL ENGINEERING RESEARCH & DESIGN
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2024
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IF 3.7
Xu Zhang,Yanan Li,Yuting Yuan,Cuiming Wu,Xiaolin Wang,Yahua Liu,Xiaozhao Han
The main key component in bipolar membranes (BPMs) is the interfacial layer (IL), which is responsible for the water splitting. In this work, a most studied MXene Ti 3 C 2 T x and a modified Ti 3 C 2 T x (PANI-Ti 3 C 2 T x ) were investigated as the catalysts in ILs of BPMs. BPMs with Ti 3 C 2 T x /PANI-Ti 3 C 2 T x were prepared through the layer-by-layer casting/spraying method. The resulting BPMs were assessed through morphologies, thermal stability, alkali resistance performance, current-voltage (I-V) curves and water splitting performance in the bipolar membrane electrodialysis (BMED). Results show that the as-prepared BPMs exhibited excellent adhesion between layers, good thermal stability and alkali resistance performance. I-V curves showed that the voltage of the BPM with the PANI-Ti 3 C 2 T x addition content of 0.5% (BPM-PANI-Ti 3 C 2 T x -0.5%, ~7.0 V) at the current density of 80 mA·cm -2 was only half of that of the blank sample BPM-0 without any catalysts (~14.1 V). After the BMED operation, the final OH - concentration increment in the base chamber (∆ C OH ) and the energy consumption of the BPM-Ti 3 C 2 T x -1.0% membrane (0.089 mol·L -1 , 0.58 kWh·mol -1 ) were ~7% higher and ~29% lower than those of BPM-0 (0.083 mol·L -1 , 0.82 kWh·mol -1 ), respectively; BPM-Ti 3 C 2 T x -1.0% (0.089 mol·L -1 , 95%) showed a higher final ∆ C OH and current efficiency than the commercial membrane BP-1 (0.087 mol·L -1 , 93%), but a higher energy consumption (0.58 kWh·mol -1 ) than BP-1 (0.33 kWh·mol -1 ). This study suggests that MXenes have the advanced catalytic effect on water splitting occurs in ILs of BPMs.
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Journal of Materials Chemistry C
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2024
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IF 5.7
Xiaoying Yu,Tianfang Zheng,Yuanlin Li,Yanxiang Liu,Ping Guo,Hai-Hua Wang,Shin-ichi Sasaki,Xiao-Feng Wang
The production of hydrogen fuel by solar-driven photocatalytic water splitting is an attractive solution to overcome the environmental and energy problems with traditional fossil fuels. The strategies to improve the capacity of photocatalytic hydrogen production include enhancing the light absorption of materials and using co-catalysts to reduce the efficiency of electron–hole recombination. Here, we report a Schottky heterojunction photocatalyst composed of subphthalocyanine (SubPc) and Ti3C2Tx MXene, which can effectively separate photogenerated charges. The outstanding ability of SubPc to absorb visible light and the ability of Ti3C2Tx MXene to capture photogenerated electrons were applied to improve the photocatalytic hydrogen-production performance of the SubPc/Ti3C2Tx composite. Two types of SubPcs (SubPc-Cl and SubPc-OPh) were hybridized with Ti3C2Tx MXene nanosheets. The hydrogen evolution of SubPc/Ti3C2Tx with different mass ratios was experimentally investigated, and it was found that the optimized SubPc-Cl/Ti3C2Tx exhibited the best H2-production rate of 105 μmol g−1 h−1. Our findings provide a new design approach and promising strategy to develop low-cost photocatalysts for future solar-driven sustainable energy-conversion systems.
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Journal of Physical Chemistry C
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2024
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IF 3.3
Jiao Wu,Jingxuan Cui,Aihu Feng,Kun Liu,Yun Yu
Introducing “spacer” materials into Ti3C2Tx layers is a powerful approach to reduce layer stacking and enhance the utilization of active sites in capacitive deionization (CDI). In this research, porous carbon spheres derived from polymethacrylates (PMMA) act as the “spacer” material, and the Ti3C2Tx/C composite is prepared through a straightforward technique of mixing followed by annealing. Through the cooperative effect of the “separation” of Ti3C2Tx nanosheets and the porous nature of the carbon spheres, Ti3C2Tx/C has a large specific surface area of 96.01 m2 g–1, a pore volume of 0.2306 cm3 g–1, and a well-developed mesoporous structure. Benefiting from the increased adsorption sites coupled with lower migration resistance, Ti3C2Tx/C achieves an ion adsorption capacity of 24.29 mg g–1 and ion adsorption rate of 0.0485 mg g–1 s–1 in 1000 μS cm–1 NaCl solution at 1.2 V, reflecting an increase of 76 and 166%, respectively, compared to m-Ti3C2Tx (13.8 mg g–1 and 0.0485 mg g–1 s–1). Besides, it is established that the ion adsorption process of Ti3C2Tx/C is more accurately described by the second-order kinetic module.
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Materials Today Chemistry
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2024
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IF 6.7
Xiangjun Li,Rongtao Wu,Yuxin Shi,Shijie Ding,Miaomiao Li,Shiwei Xu,Bing Zhang,Libo Tong,Qingjuan Wang
The anti-corrosion/anti-wear advantages of Ti 3 C 2 T x MXenes are limited in environmentally friendly water-based resins due to their instability in aqueous environments and poor compatibility with polymers. In this study, a dual-functional waterborne polyurethane (WPU)/Ti 3 C 2 T x MXene hybrid coating with excellent corrosion resistance and wear resistance is designed. This strategy uses dopamine-grafted Ti 3 C 2 T x MXene sheets to enhance the dispersibility and compatibility of Ti 3 C 2 T x MXene nanosheets in WPU through covalent and hydrogen bonds and can alleviate the oxidation of Ti 3 C 2 T x MXene in aqueous solution. In 3.5 wt% NaCl solution, PMXene and WPU composite (WPU@PMXene) coating has the lowest corrosion current density of 7.73 × 10 −8 A cm −2 and the highest polarization resistance of 1.22 × 10 7 Ω cm 2 , which is better than that of bare Mg alloys 3 orders of magnitude. The |Z| f = 0.01Hz value of WPU@PMXene coating is 3 orders of magnitude higher than that of pure WPU coating. In addition, the wear rate of WPU@PMXene coating is reduced from 2.93 × 10 −3 mm 3 /(N·m) of pure WPU to 0.9 × 10 −3 mm 3 /(N·m) (reduced by 3 times). The improved performance is due to the “labyrinth effect” and increased compatibility of dopamine modified Ti 3 C 2 T x MXene. This synergistic effect exploits a novel and convenient approach of expanding the application of Ti 3 C 2 T x MXene in aqueous coatings to enhance corrosion and wear resistance.
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TRIBOLOGY INTERNATIONAL
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2024
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IF 6.1
Tian Zhang,Liangliang Xiong,Zhongpan Zhang,Xiaoqiang Fan
To achieve the desired performance of ultra-low friction and wear, we devised an ingenious solid-grease composite lubrication coating (TXL) that combined parallel-arranged Ti 3 C 2 T x resin coatings (TX) and lithium complex grease (LCG). The TX coating facilitated in-situ supply of Ti 3 C 2 T x and effectively inhibited crack propagation, while the LCG ensured a stable oil film bearing capacity. The Stribeck theory demonstrates that TXL consistently remained in boundary lubrication. At 253.93 MPa for 2 h, pure epoxy (EP) and TX coating failed, while TXL still enhanced anti-friction by 19.57 % and anti-wear by 64.31 % relative to EPL. Combining the dual advantages of Ti 3 C 2 T x that promotes lubrication state change and oil-based films supplied by LCG, TXL demonstrates enormous potential for long-lasting, efficient, and stable lubrication.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yanxiang Liu,Yuanlin Li,Yu-Ting Xu,Hai Xu,Yu Gao,Xiao-Feng Wang,Ritsuko Fujii,Shin-ichi Sasaki
Developing efficient heterojunction photocatalysts with improved light-harvesting capacity and high charge carrier separation rates for photocatalytic hydrogen production remains a challenge in the field of energy conversion. In this study, we synthesized two-dimensional Ti 3 C 2 T x nanosheets through HF etching of Ti 3 AlC 2 and combined them with carotenoid dyes ( Car ) with different structural characteristics using a solvent spontaneous volatilization method to construct novel Car @Ti 3 C 2 T x Schottky heterojunctions. The intimate interface contacts between the two-dimensional Ti 3 C 2 T x MXene and Car enhanced the light-harvesting capacity of the photocatalysts and promoted charge separation rates. The optimal sample, Car-3 @Ti 3 C 2 T x nanocomposite, exhibited excellent photocatalytic activity of 84.4 µmol h −1 g −1 for H 2 production under visible light illumination. This work demonstrates the potential of earth-abundant organic Car dyes in constructing high-efficiency and low-cost photocatalysts for hydrogen production .
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Liming Yao,Liwei Qian,Wenqi Song,Sufeng Zhang,Yuhao Zhang,Lijing Zhang,Xikuan Li,Guangqi Yan,Valentin Nica
Two-dimensional (2D) transition metal carbides (Ti3C2Tx MXene) have demonstrated substantial application potential across various fields, owing to their excellent metallic conductivity and solution processability. However, the rapid oxidation of Ti3C2Tx in aqueous environments, leading to a loss of stability within mere days, poses a significant obstacle for its practical applications. Herein, we introduce an antioxidant strategy that combines free radical scavenging with surface passivation, culminating in the design and synthesis of imidazolium-based ionic liquids (ILs) incorporating siloxane groups. By deploying a straightforward hydrolysis-addition reaction, we successfully fabricated IL-modified Ti3C2Tx materials (Ti3C2Tx-IL). The Ti3C2Tx -IL not only displayed exceptional conductivity exceeding 3.85 × 104 S/m and hydrophilic contact angles below 45° but also showcased its superior chemical stability and antioxidation mechanisms through various analyses, including visual color change experiments, spectroscopic and energy spectrum characterization, free radical scavenging tests, and density-functional-theory-based molecular simulations. Furthermore, when utilized as a conductive filler in the fabrication of a poly(vinyl alcohol)/nanocellulose fiber (PVA/CNF) composite hydrogel (PCMIL), the resultant sensors exhibited remarkable mechanical performance with up to 535% strain, 1.59 MPa strength, 4.35 MJ/m3 toughness, and a conductivity of 3.40 mS/cm, as well as a high sensitivity gauge factor of 3.3. Importantly, even after 45 days of storage, the PCMIL retained most of its functionalities, demonstrating superior performance in human-machine interaction applications compared to hydrogels made from unmodified Ti3C2Tx. This research establishes a robust antioxidant protection strategy for Ti3C2Tx, offering substantial technical reinforcement for its prospective applications in the realm of flexible electronics and sensing technologies.
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PubMed
高影响因子
WEAR
·
2025
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IF 6.1
Sudesh Singh,Tianyi Han,Xinchun Chen,Chenhui Zhang
Although MXene and MoS 2 individually possess outstanding anti-friction and wear-resistant properties in numerous applications, the combination of both in the recent past has created a new frontier in cutting-edge applications. The current work insights into the impregnation of porous alumina ceramics in the MXene (1 wt %), MoS 2 (1 wt %), and hybrid (0.5 wt % MXene +0.5 wt % MoS 2 ) solution to fabricate self-lubricating alumina composites via vacuum impregnation method and afterward exploring the mechanical as well as tribological properties of the synthesized composites. A significant strengthening of the matrix for impregnated composites was observed compared to unimpregnated porous ceramics. The impregnated composites were slid against the zirconia ball to assess the friction behavior. The results revealed that the ceramics impregnated with MXene only can reduce COF by ∼43 % of that unimpregnated ceramics; however, in conjunction with MoS 2, the reduction can be lowered to ∼70 % attributed to synergistic effect of MXene and MoS 2 to form the tribo-layer over interacting surfaces. The study concludes that hybrid (MXene/MoS 2 ) impregnation of porous ceramics exhibits excellent self-lubricating properties over other impregnations, making them suitable candidates for advanced tribological applications. This novel combination leverages the unique properties of MXene and MoS 2 to enhance the longevity and performance of porous ceramics in demanding operational environments.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Wang Guo,Zhiqiang Ma,Zhou Chen,Haojun Hua,Dong Wang,Mohamed Elhousseini Hilal,Yatian Fu,Pengyi Lu,Jian Lu,Yuanting Zhang,Derek Ho,Bee Luan Khoo
Increasing demand for flexible sensors in healthcare has spurred the development of nanomaterial-polymer composite sensors. However, existing pressure sensors suffer from low sensitivity due to poor interactions between the functional filler and the polymer matrix. For example, the direct chemical bonding of nanomaterials to the surface of chemically inert polymers such as polydimethylsiloxane (PDMS) is not easily achieved. Herein, we demonstrate that MXene can significantly promote the sensitivity of a thin and soft piezoresistive sensor based on a surface functionalized PDMS (FPDMS) sponge. Using plasma treatment, we constructed a MXene-FPDMS (MFP) sponge with high mechanical strength via the interlayer hydrogen bonding effect. The formed MFP sponge structure (∼450 μm in thickness) endows the pressure sensor with a high sensitivity of 14.2 kPa −1 and a low modulus of 9.7 kPa, critical for detecting ultra-low pressures. When operated with deep learning algorithms, the MFP sponge sensor successfully classifies the pronunciation of 26 letters and various polite expressions with an average accuracy of 94 ± 0.6 %. We envision that this work paves the way for the development of intelligent wearable platforms.
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Applied Materials Today
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2024
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IF 7.2
Qianqian Qiao,Jinyu Wang,Bingjiao Li,Yuhao Guo,Tao Liao,Ziqiang Xu,Ying Kuang,Cao Li
Photothermal therapy (PTT)-based combination therapy is an effective approach to cancer treatment. However, there is a possibility of tumor development due to the inflammation caused by PTT. In addition, hyperthermia can cause damage to normal tissues. This work reported a drug delivery/cascade enzyme system based on Ti 3 C 2 T x MXene nanosheets. Ultra-small, degradable mesoporous silica nanoparticles (DS-MSN) were prepared to load phloretin (Phl), which has anti-inflammatory, antioxidant, and anticancer properties. Subsequently, glucose oxidase (GOx) was adsorbed on the surface of DS-MSN. The nanoparticles were then modified on Ti 3 C 2 T x MXene nanosheets and finally treated with polyethylene glycol (PEG) to obtain the multifunctional system named Ti 3 C 2 T x -Phl@DS-MSN-GOx-PEG (TPDMGP). The high near-infrared photothermal conversion efficiency of Ti 3 C 2 T x made it suitable for PTT. GOx and Ti 3 C 2 T x formed a cascade enzyme system inside cancer cells: Ti 3 C 2 T x exhibited catalase (CAT)-like activity that decomposed intracellular hydrogen peroxide (H 2 O 2 ) into O 2 , which was provided to GOx for enhanced starvation therapy. GOx in the presence of O 2 produces H 2 O 2 , for the oxygen production of Ti 3 C 2 T x . Meanwhile, DS-MSN could be degraded in the reducing environment inside cancer cells as it contains disulfide bonds in its backbone, thus releasing Phl for chemotherapy. Such a combination therapy strategy could achieve a satisfactory therapeutic outcome by low-temperature PTT while evading normal tissue damage by high temperature. The anti-inflammatory effects of both Ti 3 C 2 T x and Phl enabled TPDMGP to eliminate the inflammation caused by PTT via the scavenging of reactive oxygen species (ROS). The multifunctional system is expected to generate new paradigms for cancer PTT.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Siyuan Diao,Lili Meng,Christian Mark Pelicano,Jiajia Huang,Zhihong Tian,Feili Lai,Tianxi Liu,Shaokui Cao
Photothermal responsive hydrogels are widely used in bionic soft actuators due to their remote-controlled capabilities and flexibility. However, their weak mechanical properties and limited responsiveness hinder their potential applications. To overcome this, we developed an innovative laponite/MXene/PNIPAm (LxMyPN) nanocomposite hydrogel that is mechanically robust and exhibits excellent photothermally responsive properties based on abundant hydrogen bonds. Notably, laponite clay is used as a co-cross-linking agent to improve the mechanical properties of LxMyPN hydrogel, while MXene nanosheets are added to promote the photothermal responsiveness. The resulting L3M0.4PN nanocomposite hydrogel exhibits enhanced mechanical properties, with a compressive strength of 0.201 MPa, a tensile strength of 90 kPa, and a fracture toughness of 27.25 kJ m–2. In addition, the L3M0.4PN hydrogel displays a deswelling ratio of 73.6% within 60 s and experiences an excellent volume shrinkage of 82.4% under light irradiation. Furthermore, hydrogel actuators with fast response behaviors are constructed and employed as grippers capable of grasping and releasing target objects. Overall, this high-strength and fast-responsive hydrogel actuator is beneficial to paving the way for remote controlled soft robots.
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高影响因子
Nano Research
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2024
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IF 9.5
Zeng Shaofeng,Ye Yuanji,Zhou Peidi,Yi Shimin,Guo Qiaohang,Chen Huamin,Shen Guozhen,Weng Mingcen
Smart actuators have a wide range of applications in bionics and energy conversion. The ability to reconfigure shape is essential for soft actuators to achieve various shapes and deformations, which is a crucial feature for next-generation actuators. Nonetheless, it is still an enormous challenge to establish a straightforward approach to creating programmable and reconfigurable actuators. MXene-cellulose nanofiber composite film (MCCF) with a brick-and-mortar hierarchical structure was produced through a vacuum filtration process. MCCF demonstrates impressive mechanical properties such as a tensile stress of 68 MPa and a Young’s modulus of 4.65 GPa. Besides, the MCCF highlights its potential for water-assisted shaping/welding due to the abundance of hydrogen bonds between MXene and cellulose nanofibers. MCCF also showcases capabilities as a humidity-driven actuator with a rapid response rate of 550°·s −1 . Using the methods of water-assisted shaping/welding, several bionic actuators (such as flower, butterfly, and muscle) based on MCCF were designed, highlighting their versatility in applications of smart actuators. The research showcases the impressive capabilities of MXene-based actuators and offers beneficial insights for the advancement of future intelligent materials.
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危险品化学品经营许可证（带存储）