Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 27
·14364-14373
·
IF 14.511
Meng Jin,Wei Chen,Liu-Xin Liu,Hao-Bin Zhang,Lvxuan Ye,Peng Min,Zhong-Zhen Yu
Conventional conductive Ti3C2Tx MXene films are limited by their low transparency and brittleness. Herein, we demonstrate a crack-template assisted spraying methodology for the fabrication of transparent, flexible, and conductive MXene grid–silver nanowire hierarchical films for high-performance electromagnetic interference (EMI) shielding, joule heating, and resistive touch panel applications. The conductive grid skeletons are constructed by depositing MXene sheets into the cracks of the templates followed by removing the templates. By tuning the loading density of MXene sheets, both optical transmittance and electrical conductivity of MXene grid skeletons can be precisely manipulated. The resultant conductive grid exhibits an EMI shielding efficiency of 21.7 dB and fair transmittance simultaneously. Crucially, one-dimensional silver nanowires (AgNWs) are adopted to construct hierarchical structures for increasing electron transport channels and enhancing light penetration. The hierarchical MXene grid/AgNW film achieves a high transmittance of 81% and an excellent EMI shielding efficiency of 24.6 dB. The transparent, flexible and conductive MXene grid/AgNW film is suitable for transparent heaters and resistive touch panels. The integration of grid fabrication and the hierarchical structure design effectively balances the transparency and the conductivity, and is promising for producing multifunctional films with high transparency, high conductivity, and high EMI shielding efficiency.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
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.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
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.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 10
·2101740
·
IF 8.856
Lianjia Zhao,Xiyao Fu,Hao Xu,Yiqiang Zheng,Wei Han,Lili Wang
Temperature is a basic physical quantity that is essential to life and productivity. However, continuously and efficiently monitoring a full range of temperatures remains a serious challenge. Herein, a full-range (−20 to 100 °C) flexible temperature sensor is designed using Ti 3 C 2 T x MXene as an active conductive skeleton and sodium alginate hydrogel as a heat-sensitive coating layer. The sensor exhibits accurate and stable temperature response across the entire range, with a sensitivity of up to 3244% °C −1 . Moreover, it not only dynamically detects liquid nitrogen, but also effectively senses gradually approaching objects within a certain range. Lastly, a temperature monitoring system based on the sensor realizes the perfect monitoring of a cold-storage model. This work will inject new vitality into the development of temperature sensors.
研究领域:
材料科学
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传感器技术
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生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xianhong Zheng
MXenes have attracted tremendous attention in the area of electrochemical energy-storage devices owing to their high electrical conductivity , pseudocapacitance and two-dimensional lamellar structure . Nevertheless, MXene flakes intrinsically tend to lie flat and restack, resulting in highly tortuous ion transport pathways and inferior ion accessibility. Herein, we develop a femtosecond laser ablation strategy to fabricate flexible and high-performance MXene ribbon supercapacitor electrodes. The fabricated MXene ribbons have porous edges with exposed continuous lamellar channels, which shortens the H + transport pathways, impregnates with sufficient electrolyte, benefits for H + intercalation and ion storage. The resultant MXene ribbons exhibit high specific capacitance (1308.3 mF/cm 2 ), good rate capability and long cycling life (95% capacitance retention and 92% coulombic efficiency after 30,000 cycles). This work provides a new strategy for the rational structure design of high-rate MXene-based supercapacitor electrodes and lays the foundation for the next generation high-performance energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Huanmin Liu,Chao Wu,Kangle Lv,Dingguo Tang,Qin Li
Photogenerated charge separation is a challenging step in semiconductor-based photosynthesis. Though numerous efforts have been devoted to developing multi-component photocatalyst heterostructures for improving charge separation efficiency, the short distance between electrons and holes-aggregated regions still leads to undesirable charge recombination. Herein, a facile and commercial in-situ synthesis method was designed to directly prepare a three-component Au–carbon–TiO 2 photocatalyst from Ti 3 C 2 MXene , air, CO 2 , and HAuCl 4 , in which the carbon layer bridged Au and TiO 2 nanoparticles for stable and efficient photocatalytic hydrogen production. Kelvin probe measurements and density functional theory (DFT) calculations demonstrated that a multi-interfacial charge transmission network was successfully constructed to achieve a directional and long-distance spatial charge separation/transfer channel between TiO 2 and Au through carbon layer, desirably inhibiting the recombination of photogenerated charge carriers. The hydrogen production rate of the formed three-component Au/C–TiO 2 (CTA) photocatalyst was demonstrated to be 27 times higher than that of Au–TiO 2 , which also surpassed many reported Ti 3 C 2 MXene-derived carbon–TiO 2 photocatalysts. This work sheds light on the ingenious use of 2D MXene to form a well-behaved TiO 2 -based photocatalytic system and helps to propose future design principles in accelerating charge transfer.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Yanliang Zhou,Yicong Chai,Xiaoyu Li,Zihao Wu,Jian Lin,Yujia Han,Lin Li,Haifeng Qi,Yiming Gu,Leilei Kang,Xiaodong Wang
Selective oxidative dehydrogenation (ODH) of light alkanes to alkenes over metal oxides usually obeys a redox catalysis cycle, where the release and recovery of lattice oxygen play a key role in catalytic performance. Therefore, it remains a challenge to prepare metal oxides with limited reducibility, such as TiO2, as a dominant active component rather than as a support or modifier in this process. Here, we find a significant increase of ethane ODH performance over a layered TiO2 (M-TiO2) catalyst, which is in situ evolved from a Ti3C2Tx MXene material during the reaction. The reactivity of this M-TiO2 is 4 times higher than that of P25 TiO2, with an excellent ethylene productivity of 15.4 gC2H4 gcat–1 h–1 that outperforms the previously reported catalysts. Experimental characterizations and theoretical calculations reveal the importance of Ti and oxygen vacancy defects over M-TiO2 on the conversion of C2H6. The Ti vacancy sites can stabilize the defective structure and increase the reducibility of lattice oxygen to reduce the activation energy barrier of ethane, while the oxygen vacancy sites facilitate the activation of O2 to recover lattice oxygen.
研究领域:
催化化学
·
材料科学
·
理论计算
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Chenguang Jiang,Wenyuan Xie,Defeng Wu
Solvent replacement is an effective strategy to improve the freezing resistance of hydrogels. The physicochemical properties of those organics are key to the overall performance of as-obtained organohydrogels. In this work, we performed a comparative study to explore the relationships between the types of solvents with similar chemical structures and the intrinsic properties of the organohydrogels. Poly(vinyl alcohol)/MXene composite hydrogel was used as a template, and three types of alcohols (ethanol, ethylene glycol, and glycerol) were used as exchange solvents. A “2-varible/5-outputs” method was developed, and the overall performance of as-obtained organohydrogels was optimized in terms of alcohol types and weight retention ratios. The organohydrogel containing ethanol with 50% weight retention ratio showed balanced properties: optimized modulus and good strength, superior compliance and recovery efficiency, high strain sensitivity, and wide detection range, which was more suitable to detect human motions. This work can provide valuable information on fabricating organohydrogels with optimized overall properties for flexible strain sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Batteries & Supercaps
·
2020
·Vol. 3
·期 9
·892-899
·
IF 0
Wantang Li,Yifang Zhang,Huan Li,Zijin Chen,Tongxin Shang,Zhitan Wu,Chen Zhang,Jia Li,Wei Lv,Ying Tao,Quan-Hong Yang
The shuttle effect of lithium polysulfides (LiPSs) from sulfur cathode to lithium (Li) anode is one of the main obstacles for lithium-sulfur (Li−S) batteries. The severe corrosion of Li metal anode by the dissolved LiPSs bottlenecks the efficient operation of Li−S batteries, however, the anode part has not been received much attention compared to those extensive efforts related to the cathode designs. Herein, we show that the interface between Ti 3 C 2 T x (T=−OH, −F)-based MXene and reduced graphene oxide (rGO) is able to guide uniform Li nucleation, promoting highly reversible and dendrite-free Li plating/stripping. Such the Li anode demonstrates excellent cycling stability for more than 1000 hours even under ultra-high rate (10 mA cm −2 ) and high areal capacity (3 mAh cm −2 ). More importantly, the well-designed 2D layered structure by coupling the Ti 3 C 2 T x with a graphene scaffold, is highly efficient to block the shuttled polysulfides and inhibit the corrosion of the lithium metal anode. As a result, the Li−S full battery exhibits a stable cycling stability with a high Coulombic efficiency of 99.8 % over 300 cycles. This work suggests the design strategy of Li metal anode especially targeting at the sulfur cathode, and we hope it can provide valuable inspirations for the future design of Li metal anodes for more practical Li−S batteries. Graphical MXene shield : The rGO/Ti 3 C 2 T x interfaces favor Li nucleation and deposition, contributing to dendrite-free Li plating/stripping behaviors inside the scaffold. The membrane also mitigates the side reactions of Li by blocking the shuttled lithium polysulfides, which promotes the efficient cycling of Li−S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 29
·13962-13973
·
IF 4.682
Wang Yifan,Wan Yuqin,Meng Xiangqi,Jiang Lei,Wei Hao,Zhang Xinyue,Ma Ning
Solar energy, as an endless clean energy, has great prospects for the use of water vapor from sewage purification and seawater desalination. Local heating of surface water has shown to maximize the energy efficiency of steam generation. Therefore, at first, the material is required to have a good ability of photo-thermal conversion. Among the photo-thermal converting materials, MXenes are arising candidates for effective photo-thermal conversion, which have shown excellent photo-thermal conversion efficiency and have been attempted for photo-thermal distillation. Although a high photo-thermal conversion efficiency has been realized, however, it is more challenging to prepare photo-thermal evaporating materials with rapid water transport capacity and generating solar steam. In this work, a photo-thermal distillation device was reported by combining a chitosan aerogel with a bio-inspired wood-like oriented porous structure prepared by directional freezing method, and Ti 3 C 2 T x two-dimensional nanosheets coated with polyethyleneimine sprayed on the surface. The ordered microporous structure can quickly transport moisture from the bottom up to the evaporation surface by capillary force. The coating of Ti 3 C 2 T x coated with polyethyleneimine on the evaporation surface has a strong ability to capture sunlight. The evaporation rate reaches 3.99 kg m −2 h −1 under the optical power density of 3000 W m −2 and the efficiency reaches 90%, indicating the broad application prospects as a photo-thermal conversion material for efficiently producing clean fresh water. Graphical abstract
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Jiucong Liu,Mengdi Zhang,Di Zhang,Xizheng Liu
Lithium-ion batteries (LIBs) suffered from severe performance fading when operated at lower temperatures due to the increase of Li desolvation energy and the formation of Li dendrites on the anode surface. It is critically important to develop a suitable anode with higher capacity retention at lower temperatures for advanced LIBs. Herein, we report the fabrication of a composite anode by confining room-temperature liquid GaInSn alloys within a porous 2D-layered V2CTx MXene. This configuration combines the high capacity of liquid metal (LM) and high ionic conductivity of 2D V2CTx by confining self-healing LM within the V2CTx framework, resulting in enhanced long-term cycle performance (1174.6 mA h g–1 after 200 cycles at 200 mA g–1) and low-temperature performance (529.6 mA h g–1 after 100 cycles at −20 °C). Theoretical calculations disclose that the strong adsorption of V2CTx to LM ensures the stability of the composites. It also reveals that LM with a lower adsorption energy promotes the transportation of Li+. The LM nanodroplets buffer the volume change of V2CTx during charging/discharging and avoid electrode crushing. The expanded layers of V2CTx and the porous structure facilitate the Li-ion desolvation and transportation at lower temperatures, thus suppressing the performance fading. This work paves the way for the development of composite anodes for LIBs with high specific capacity toward low-temperature applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Yunyi Zhu,Ji Liu,Tong Guo,Jing Jing Wang,Xiuzhi Tang,Valeria Nicolosi
The fast development of terahertz technologies demands high-performance electromagnetic interference (EMI) shielding materials to create safe electromagnetic environments. Despite tremendous breakthroughs in achieving superb shielding efficiency (SE), conventional shielding materials have high reflectivity and cannot be re-edited or recycled once formed, resulting in detrimental secondary electromagnetic pollution and poor adaptability. Herein, a hydrogel-type shielding material incorporating MXene and poly(acrylic acid) is fabricated through a biomineralization-inspired assembly route. The composite hydrogel exhibits excellent stretchability and recyclability, favorable shape adaptability and adhesiveness, and fast self-healing capability, demonstrating great application flexibility and reliability. More interestingly, the shielding performance of the hydrogel shows absorption-dominated feature due to the combination of the porous structure, moderate conductivity, and internal water-rich environment. High EMI SE of 45.3 dB and broad effective absorption bandwidth (0.2–2.0 THz) with excellent refection loss of 23.2 dB can be simultaneously achieved in an extremely thin hydrogel (0.13 mm). Furthermore, such hydrogel demonstrates sensitive deformation responses and can be used as an on-skin sensor. This work provides not only an alternative strategy for designing next-generation EMI shielding material but also a highly efficient and convenient method for fabricating MXene composite on macroscopic scales.
研究领域:
材料科学
·
电子工程
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）