MXene latest developments Clean Sweep!
1 Yury Gogotsi like \”AFM\”:based fibers, yarns and fabrics for wearable energy storage device
Thanks to the discovery of new devices fabric of electrically conductive material and innovative fabric equipment design. These devices include those based super capacitor (TSCs) fabric comprising fibers, yarn and fabric super capacitors, which in practical terms of power value of the wearable device. A recent review article highlights the limited energy density of TSCs is a major challenge that requires new electrode material has a higher conductivity than existing materials and the theoretical capacitance. Ti3C2Tx MXene is a family, because of its pseudocapacitive properties, in an acidic electrolytic solution and its conductive metal known high-capacity capacitor. Under these drivers excellent performance, recently reported in the literature and TSCs Ti3C2Tx integrated process compared to the non-yl MXene TSCs, the area and volume of the capacitor is remarkably improved. In addition, the knitting MXene group TSCs shows the practical application of the energy storage device wearable in textiles. Recently, Genevieve Dion Deakin University in Australia, Yury Gogotsi Drexel University United States and Joselito M. Razal reports focus on the progress made for the production of MXene-based fiber, yarn and fabric technology and equipment design and performance indicators. It discusses the challenges of introducing new material in the fiber / yarn / fabric structure in the face, which will help the development of textile equipment out of storage applications. Proposed MXene base adjustable mechanical, electrical and electrochemical properties of the fiber development opportunities, this will be the direction of future research. Link: https:. //Onlinelibrary.wiley.com/doi/ 10.1002 / adfm.202000739
2 \”AFM\”: a(Ti3C2Tx) adaptation IOL Design applications
Although the intraocular lens (IOL) is used to restore the cataract patient\’s vision, but there is no clinically available lens can effectively simulate the natural lens of the eye adjusting function, so their development is limited. Dimensional transition metal carbide and /Or nitride (MXenes) optical and electrical properties, including high electrical conductivity, optical transparency, flexibility, biocompatibility and hydrophilicity, indicating its potential application in the adjustable IOLs. Brighton University, UK Susan Sandeman proposed use Ti3C2Tx (MXene) as a transparent conductive electrode, to change the optical power. Synthesized Ti3C2Tx, and spin coating on a hydrophobic acrylic IOLs, the sheet resistance obtained in the range of 0.2-1.0 kΩsq-1, the transmittance of 50-80% in the visible region. Coating the lens in lens epithelial cells and mononuclear cells without cytotoxicity and inflammation. Adjustable focus test cell was prepared using a liquid crystal layer (LC) between the solid support Ti3C2Tx coating. By applying an electric field, molecular orientation of the liquid crystal layer again, when viewed through the test unit in and out of focus object appears, lead to variations in the optical power. This study demonstrates reversible, control, adjustable focus, is the first step in using Ti3C2Tx regulatory intraocular lens design. Link: https:. //Onlinelibrary.wiley.com/doi/10.1002/adfm.202000841
3 \”AFM\”: MXene in storage capacitance and pseudocapacitance
[ 123] electrochemical capacitor electrodes MXene a unique behavior, i.e., capacitive and pseudocapacitance depends electrolyte. Japan\’s National Institute of Advanced Industrial Science and Technology Yasunobu Ando order to better understand the mechanism of electrochemical their adopted based on density functional theory and implicit solvation model (referred to as three-dimensional reference – location model – interaction) First of principles calculations. Electronic state from the point of view, prevents the hydration shell MXene orbit coupling between the intercalated ions, thereby forming an electric double layer capacitor and behavior. However, once adsorbed onto the cationic and partially dehydrated MXene surface, due to the cationic state and MXene orbit coupling state, in particular terminating group to the surface, and results in charge transfer pseudocapacitive behavior. The full text link: https: //onlinelibrary.wiley.com/doi/10.10. 02 / adfm.202000820
4 \”AFM\”: i-MXenes for energy storage and catalysis
2017, a new plane, four chemical orderly yuan MAX phase series, i-MAX that is being reported. The first i-MAX phase (Mo2 / 3Sc1 / 3) 2AlC Sc in the presence of chemically ordered dominant M Mo layer, Al and Sc and facilitate removal during etching, thereby producing a degree of ordering the 2D i-MXene, Mo1.33C, attracted extensive research attention. i-MXene having a low resistivity of about 1150 F 33.2μΩm-1 is a high volume of capacitance cm-3. After this discovery, it was synthesized to date with 32 i-MAX and 5 i-MXene, which show potential applications, including, but not limited to storage and catalysis. Basic research i-MAX and i- MXene phase of its application Bilal Ahmed and Johanna Rosen reviews the Linköping University in super capacitor and catalysis. In addition, also presented the latest research results Mo1.33C ion intercalation and etching post-treatment. The charge storage performance by forming a hydrogel and MXene be adjusted by annealing an inert atmosphere, an inert atmosphere annealing MXene hydrogel having superior volumetric capacitance of about 1635F cm-3. Also demonstrated the potential for i-MXene family in catalysis and energy storage applications, and stressed that the new research direction for further development and successfully used in practical applications. Link: https: //onlinelibrary.wiley.com/doi/10.1002/adfm.202000894
5 \”AFM\”:. Ultrastable MXene @ Pt / SWCNTs nano hydrogen evolution catalyst [123 ] developed atomic level or nano-platinum-group hydrogen evolution reaction (HER) electrocatalyst is important to alleviate the problem of low abundance of platinum. Recently, Shenyang Materials Science, National Research Center researcher Wang Xiaohui proposed to build a level of platinum -MXene- single walled carbon nanotubes (SWCNTs) heterostructure for HER-catalyzedProgram. In the heterostructure, highly active nano / atomic scale is fixed to the metallic platinum Ti3C2Tx-MXene sheet (MXene @ Pt) is connected to the conductive network SWCNTs. By filtration and SWCNTs MXene @ Pt containing a mixed colloidal suspension constructed layered heterostructure. MXene using hydrophilicity and reducing, without adding a reducing agent and after-treatment of the Pt cation spontaneously reduced to metallic Pt, prepared MXene @ Pt colloidal suspension. HER graded catalyst prepared in the form of film exhibit high stability during operation of 800 hours with respect to the reversible hydrogen electrode (RHE), the catalyst having up to 230 mA cm-3 at -50 mV volume current density, as low as -62 mV and at a current density of -10 mA cm-2 the overvoltage. This solution provides a simple processing strategies, efficient, scalable way to build stable and efficient HER catalyst. Given the nature and structure-activity relationship Pt-MXene-SWCNTs heterostructure, other MXene may show greater electrical potential in catalysis.
The full text link: https: //onlinelibrary.wiley.com/doi/10.1002/adfm.202000693