SusMat
·
2022
·Vol. 2
·期 3
·379-390
·
IF 0
Xiang Chu,Yihan Wang,Lucheng Cai,Haichao Huang,Zhong Xu,Yanting Xie,Cheng Yan,Qing Wang,Haitao Zhang,Hong Li,Weiqing Yang
The wide-spread proliferation of aqueous MXene-based supercapacitor has been largely shadowed by the limited cell potential window (typically in the range of 0–0.6 V). To address this baffling issue, designing asymmetric supercapacitor (ASC) is proposed as a rational strategy to enlarge the potential window (thus energy density) of individual cell in aqueous electrolytes. To this date, however, it still remains a great challenge to develop easy fabricating, 3D nanostructured, and pseudocapacitive cathode materials that can perfectly match with MXene anode materials. In this work, we propose a supramolecular strategy to construct conducting polymer hydrogel (CPH) with highly interconnected 3D nanostructures and large pseudocapacitance, which can finely match with 2D Ti 3 C 2 T x . The as-assembled CPH//Ti 3 C 2 T x ASC with CPH cathode and MXene anode can operate in a broadened potential window of 1.15 V in aqueous PVA/H 2 SO 4 gel electrolyte with remarkably improved energy density of 16.6 μWh/cm 2 (nine times higher than that of symmetric MXene supercapacitor). Additionally, this ASC exhibits outstanding cyclic stability with no trackable performance decay over 30,000 galvanostatic charge and discharge cycles. It is demonstrated in this work that employing positive CPH electrode is a feasible yet promising strategy to enhance the potential window and energy density of aqueous MXene supercapacitors.
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenlong Luo,Qianwen Liu,Baozhong Zhang,Jie Li,Ruidong Li,Tingxi Li,Zhiqiang Sun,Yong Ma
MXene nanosheets are susceptible to self-accumulation during operation, which significantly hampers their application. However, this issue can be effectively addressed through the introduction of intercalation materials. In this study, an MXene/reduced graphene oxide (rGO)/carbon nanotubes (CNTs) (MGC) film is prepared using vacuum-assisted filtration. CNTs and rGO nanosheets, as intercalation materials, play a crucial role in forming a stable interlayer structure with MXene nanosheets, resulting in an expansion of the MXene layer spacing and the creation of multi-directional stable ion transport channels. Consequently, a larger number of ion-accessible active sites are exposed. The prepared MGC film exhibits an impressive specific capacitance of 463.5F g −1 at a current density of 1 A g −1 . Furthermore, it is noteworthy that the asymmetric supercapacitor (ASC) assembled with the MGC film as the negative electrode and MnO 2 as the positive electrode demonstrates a large voltage window of 1.7 V, a high energy density of 33.95 Wh kg −1 at a power density of 814.8 W kg −1 , and an outstanding capacitance retention rate of 92.9% after 8000 cycles at 3 A g −1 . The optimization strategy for MGC electrodes not only showcases the feasibility of MXene development but also provides crucial technical support for the application of MXene in the emerging generation of portable and flexible wearable energy storage devices.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jie Yin,Qiuyang Han,Junchuan Zhang,Yunxiu Liu,Xueqi Gan,Kenan Xie,Lu Xie,Yi Deng
After an osteosarcoma resection, the risks of cancer recurrence, postoperative infection, and large bone loss still threaten patients’ health. Conventional treatment relies on implanting orthopedic materials to fill bone defects after surgery, but it has no ability of destroying residual tumor cells and preventing bacterial invasion. To tackle this challenge, here, we develop a novel multifunctional implant (SP@MX/GelMA) that mainly consists of MXene nanosheets, gelatin methacrylate (GelMA) hydrogels, and bioinert sulfonated polyetheretherketone (SP) with the purpose of facilitating tumor cell death, combating pathogenic bacteria, and promoting osteogenicity. Because of the synergistic photothermal effects of MXene and polydopamine (pDA), osteosarcoma cells are effectively killed on the multifunctional coatings under 808 nm near-infrared (NIR) irradiation through thermal ablation. After loading tobramycin (TOB), the SP@MX-TOB/GelMA implants display robust antibacterial properties against Gram-negative/Gram-positive bacteria. More importantly, the multifunctional implants are demonstrated to have superior cytocompatibility and osteogenesis-promoting capability in terms of cell replication, spreading, alkaline phosphatase activity, calcium matrix mineralization, and in vivo osseointegration. Accordingly, such photothermally controlled multifunctional implants not only defeat osteosarcoma cells and bacteria but also intensify osteogenicity, which hold a greatly promising countermeasure for curing postoperative tissue lesion from an osteosarcoma excision.
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DOI
PubMed
高影响因子
Small Methods
·
2023
·Vol. 7
·期 8
·2201526
·
IF 12.4
Yongqiu Xian,Bin Wang,Zifeng Lin
MXenes have been extensively explored as supercapacitor electrodes, especially in acidic aqueous electrolytes, where ultrahigh specific capacitance can be achieved; however, their narrow working potential window (≤ 1.0 V) limits the acquisition of high energy. Neutral and alkaline electrolytes can be used to extend the working potential window but MXenes in these electrolytes are less pseudocapacitive active, which leads to reduced charge storage. In this study, it is shown that Ti 3 C 2 T x MXene in a mild AlCl 3 aqueous electrolyte can operate at a wide potential range from 0 to −1.3 V versus Hg/Hg 2 SO 4 and retain high pseudocapacitive activity. Thus, a high capacity of up to 85 mAh g −1 is achieved, surpassing its performance in H 2 SO 4 electrolyte of 78 mAh g −1 . More interestingly, most of the capacity is released at a more negative potential range than that in acidic electrolytes, making it more suitable as a negative electrode material. In situ electrochemical quartz crystal microbalance results suggest that the high capacity originates from the pseudocapacitive intercalation/deintercalation of H + instead of Al 3+ , providing the possibility of coupling MXene anodes with proton redox active cathodes to achieve high-energy and high-power devices.
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DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 40
·2200263
·
IF 15.153
Ping-Ping He,Xiaoxue Du,Yuan Cheng,Qi Gao,Chang Liu,Xiaowen Wang,Yonghua Wei,Qilin Yu,Weiwei Guo
Stimuli-responsive DNA hydrogels are promising candidates for cancer treatment, as they not only possess biocompatible and biodegradable 3D network structures as highly efficient carriers for therapeutic agents but also are capable of undergoing programmable gel-to-solution transition upon external stimuli to achieve controlled delivery. Herein, a promising platform for highly efficient photothermal-chemo synergistic cancer therapy is established by integrating DNA hydrogels with Ti 3 C 2 T X -based MXene as a photothermal agent and doxorubicin (DOX) as a loaded chemotherapeutic agent. Upon the irradiation of near-infrared light (NIR), temperature rise caused by photothermal MXene nanosheets triggers the reversible gel-to-solution transition of the DOX-loaded MXene-DNA hydrogel, during which the DNA duplex crosslinking structures unwind to release therapeutic agents for efficient localized cancer therapy. Removal of the NIR irradiation results in the re-formation of DNA duplex structures and the hydrogel matrix, and the recombination of free DOX and adaptive hydrogel transformations can also be achieved. As demonstrated by both in vitro and in vivo models, the MXene-DNA hydrogel system, with excellent biocompatibility and injectability, dynamically NIR-triggered drug delivery, and enhanced drug uptake under mild hyperthermia conditions, exhibits efficient localized cancer treatment with fewer side effects to the organisms.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wei Wang,Huimeng Feng,Jianguo Liu,Mutian Zhang,Shuan Liu,Chao Feng,Shougang Chen
Ti 3 C 2 T x (MXene) as a two-dimensional material has attracted numerous attentions in photocatalysis and antibacterial, and the effectiveness of MXene for photocatalysis triggered antibacterial is in urgent need of development. Herein, we synthesized a novel cuprous oxide (Cu 2 O) anchored MXene nanosheet. Cu 2 O nanospheres can be uniformly anchored on the surface of MXene firmly due to the electrostatic effect between single-layer MXene and Cu 2 O nanospheres. In comparison with MXene, Cu 2 O and mixture (MXene and Cu 2 O), Cu 2 O/MXene nanosheet exhibits an excellent antibacterial activity against S. aureus and P. aeruginosa , whose bacteriostasis efficiencies sharply increased to 97.04% and 95.59%, respectively. Photoluminescence spectroscopy reveals that the incorporation of MXene and Cu 2 O can effectively prevent the recombination of electron-hole pairs of Cu 2 O and present a high photocatalytic disinfection. Single-layer MXene with large surface area accepts electrons from Cu 2 O, leading to abundant electrons on the surface of MXene, which provide better charge transfer between bacteria and Cu 2 O/MXene nanosheets. In addition, density functional theory calculations were used to investigate an optimized band structure of Cu 2 O-MXene as well as its strong electronic interactions, which are essential for photocatalysis and ROS generation. Finite element method further revealed that MXene promoted an enhancement of surface plasmon resonance to generate ROS on the surface of Cu 2 O/MXene. Furthermore, Cu 2 O/MXene shows a synergistic antibacterial effect of MXene accelerating photoelectron transportation, Cu 2 O antimicrobial and photocatalysis, elevated ROS production ability, and surface plasmon resonance action on the surface of Cu 2 O/MXene.
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2026
·
IF 5.2
Marium Mushtaq,Tingkai Zhao,Abdul Jalil,Syeda Khair Un Nisa,Xianghong Li
Suppressing secondary electromagnetic reflection while maintaining high shielding effectiveness remains a central challenge for conductive MXene-based electromagnetic interference (EMI) shields. Here, 2D/0D MXene/BaFe 12 O 19 nanostructures were constructed by electrostatic self-assembly. The assembly combined negatively charged MXene nanosheets with poly(diallyldimethylammonium chloride) (PDDA)-functionalized BaFe 12 O 19 nanoparticles. This surface-charge-mediated assembly suppresses MXene restacking, creates dielectric–magnetic heterointerfaces, and systematically regulates the complex permittivity and permeability. The incorporation of BaFe 12 O 19 moderates the excessive permittivity of MXene and introduces resonance-type magnetic loss. These interrelated effects thereby alleviate the dielectric–magnetic imbalance, allowing more incident electromagnetic energy to enter and be attenuated within the shield. At a thickness of 1 mm paraffin-based toroidal specimen, MXF-3 reaches a maximum total shielding effectiveness (SE T ) of 58.0 dB at 10 GHz, with an absorption shielding effectiveness (SE A ) = 48 dB and reflection shielding effectiveness (SE R ) = 10 dB. Spin-polarized density functional theory calculations reveal orbital coupling and static charge redistribution at the MXene/BaFe 12 O 19 interface, providing electronic-structure insight into the interfacial interactions. These results demonstrate that electrostatic self-assembly is an effective route for preparing powder-based MXene/hexaferrite functional fillers for X-band EMI shielding. Download: Download high-res image (292KB) Download: Download full-size image
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 39
·14560-14568
·
IF 8.067
Qingtao Li,Wenke Yang,Kang Sun,Yan Guo,Hu Liu,Chuntai Liu,Changyu Shen
Flexible wearable electromagnetic interference (EMI) shielding materials have attracted great attention with the development of portable electronic devices, and paper based EMI shielding materials turn to be ideal candidates due to their flexibility, biodegradability and low cost. In this study, conductive MXene nanosheet decorated paper was developed through a simple dip-coating technique, where the MXene nanosheets can be strongly adhered onto the surface of cellulose fiber to construct an effective conductive network. Meanwhile, a low surface energy and micro–nano-structured 1H,1H,2H,2H-perfluorodecanethiol (PFDT)/carbon black (CB) layer was further introduced onto the surface to construct a superhydrophobic surface, avoiding the hygroexpansion of paper in water or moisture environments effectively. As a result, the prepared PFDT/CB/MXene@Paper exhibits reflection dominant EMI shielding performance, and a specific SE value of up to 3339.6 dB cm−2 g−1 was achieved. Importantly, the EMI shielding performance can be well maintained towards cyclic bending and in various acid, alkali, salt, and UV environments, which enhance the applicability of paper based functional materials significantly. Finally, its high conductivity also endows it with good Joule heating performance, improving the wearing comfort when used as a wearable EMI shielding material. This study will undoubtedly provide a high-efficiency design strategy for fabricating high-performance paper based EMI shielding materials.
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高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Yuxin Liu,Yi Yang,Bowen Deng,Lei Jing,Bo Yin,Mingbo Yang
Titanium carbide (Ti 3 C 2 ), with the features of metallic conductivity and two-dimension (2D) structure, is considered as a promising material using in supercapacitors . In this work, a kind of Ti 3 C 2 -based nanocomposite with vertically-aligned polyaniline (PANI) nanoarrays was prepared by simple in-situ polymerization, where Ti 3 C 2 served as a conductive substrate supporting the growth of PANI. Vertically aligned PANI nano-array may increase the surface area, provide considerable pseudocapacitance , and prevent the aggregation of Ti 3 C 2 nanosheets . Owing to its hierarchical structure, the composite electrode gained significant advantage in increasing electrochemical active sites and accelerating electrolyte ions diffusion. The energy storage devices with high electrochemical performance and simple preparation methods has attracted much attention reached 536 F g −1 at the current density of 0.1 A g −1 , and the composite had a good capacitance retention and cycle stability (86.2 % after 5000 cycles) at a high current density of 10 A g −1 . In addition, the symmetric supercapacitor was assembled and displayed a high energy density (933.9 W kg −1 ) at the power density of 26.9 Wh kg −1 . After 5000 charge-discharge cycles, the capacitance retention rate is 70.4 %. The experimental results indicated that the improved electrochemical performance of supercapacitor was closely related to the introduction of Ti 3 C 2 and construction of the hierarchical structure. Furthermore, the preparation strategy of Ti 3 C 2 -PANI composite can be used to further produce other composites with similar regular structure and unique electrochemical performance.
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高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 14
·4953-4961
·
IF 6.119
Junyue Li,Ziyi Wang,Huayu Chen,Qiqi Zhang,Huilin Hu,Lequan Liu,Jinhua Ye,Defa Wang
Photocatalytic reduction of carbon dioxide (CO2) into hydrocarbon fuels has attracted increasing research attention in recent years. However, the fast recombination of photoinduced charge carriers and poor adsorption/activation capability of CO2 molecules limit the photoconversion efficiency. Herein, we report on loading a two-dimensional (2D) titanium carbide (Ti3C2) MXene as a noble-metal-free cocatalyst onto zinc oxide (ZnO) via a facile electrostatic self-assembly method for efficient CO2 photoreduction. It is interesting to find that the ZnO loaded with 7.5 wt% of surface-alkalinized Ti3C2 exhibited remarkably improved evolution rates of CO (30.30 μmol g−1 h−1) and CH4 (20.33 μmol g−1 h−1), which were approximately 7-fold and 35-fold those of bare ZnO, respectively. The surface-alkalinized Ti3C2 MXene is believed to play a crucial role in improving the separation/transfer of photoinduced charge carriers and the adsorption/activation of CO2 molecules, accounting for the superior photocatalytic activity of CO2 reduction. Our work demonstrates that the Ti3C2 MXene could be employed as a noble-metal-free cocatalyst for efficient photocatalytic CO2 reduction.
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Zhiyi Wu,Shan Zhu,Xiangren Bai,Ming Liang,Xiang Zhang,Naiqin Zhao,Chunnian He
Benefiting from the unique chemical properties and the adjustable layered spacing, MXenes have been paid more attention to the field of energy storage and conversation, especially towards constructing hybrid structure for the use of Li-ion battery anodes. However, most MXene-based composites are achieved by the ex-situ mixing method on the basis of acid-etched MXene, which makes it extremely hard to maintain a good structural stability in the service process. Herein, we proposed a novel one-step in-situ strategy, i.e. SnCl 2 molten salt reaction with Ti 3 AlC 2 for synthesizing Sn-nanoconfined Ti 3 C 2 T x MXene composites. During the synthesis process, SnCl 2 not only executed as the Lewis acid to etch Ti 3 AlC 2 for obtaining Ti 3 C 2 T x MXene, but could also be in-situ transformed to Sn nanoparticles confined between the Ti 3 C 2 T x MXene layers. The 2D layer-confined effect inhibited the spontaneous coarsening of metal Sn at high temperature as well as the huge volume expansion during the electrochemical cycles. Meanwhile, the in-situ formed Sn nanoparticles as pillar played a decisive role in enlarging interlayered active spacing of Ti 3 C 2 T x MXene for Li-storage. As a result, the surprising enhancement of electrochemical Li-storage performances could be achieved during long-term cycling. This work provides a novel route to explore the application of MXene based on the molten salt methods.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wei Zheng,Zequn Yang,Jiefeng Chen,Mingguang Zhang,Hongxiao Zu,Ruiyang Qin,Wenqi Qu,Jianping Yang,Lijian Leng,Hailong Li
Utilization of monolithic mineral sulfide-based sorbent for the fix-bed elemental mercury (Hg 0 ) removal is regarded as a predominant predicament in the field of Hg 0 abatement. In this work, a general and facile route was exploited to establish CuS particles decorated 3D porous Ti 3 C 2 T x MXene aerogel via divalent Cu 2+ cations induced assembly combined with subsequent high-temperature sulfurization treatment, during which, uniform CuS particles were homogeneously anchored throughout the Ti 3 C 2 T x substrate. The obtained 3D CuS/Ti 3 C 2 T x MXene aerogel exhibited satisfactory textural property, hierarchical pore structure and strong interaction between Ti 3 C 2 T x MXene and CuS. Meanwhile, the inherent restacking of Ti 3 C 2 T x MXene nanosheet and serious agglomeration of CuS can also be effectively avoided in the formation of aerogel. Those structural advantages originating from this novel gelation process favorably contributes to satisfactory Hg 0 mass transfer and sufficient utilization of CuS active ligands, which largely strengthens Hg 0 removal performance and broadens the fix-bed application of mineral sulfides. Consequently, the Hg 0 capture capacity and adsorption rate of CuS/Ti 3 C 2 T x MXene aerogel reached 90596.4 g m −3 and 120.64 g m −3 min −1 , respectively, far outbalancing those of the reported in-situ selenized copper foam with excellent Hg 0 removal activity. The impressive Hg 0 sequestration performance is attributed to its relatively large specific surface area, layered pore channel, and highly dispersed CuS particles, largely boosting Hg 0 mass transfer and following sequestration. Moreover, other mineral sulfides/Ti 3 C 2 T x MXene aerogels can also be constructed by just replacing divalent metal cations, which makes the initial effort towards the fix-bed utilization of mineral sulfides-based aerogel for vapor-phase Hg 0 immobilization.
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高影响因子
危险品化学品经营许可证（带存储）