Abstract:Fluorinated carbon materials (FCMs) have received significant attention, because of their exceptional stability, which is associated with the strong C‐F bonding, the strongest among carbon single bonds. However, the fluorination of carbon materials requires extremely toxic and moisture‐sensitive reagents, which makes it inapplicable for practical uses. Here, a straightforward and relatively safe method are reported for the scalable synthesis of FCMs, by mechanochemical depolymerization of polytetrafluoroethyle… Show more
Our research has demonstrated that mechanochemical activation is more effective with solid reagents. We have showcased the
practicality of Bertagnini's salts, also called aldehyde‐bisulfite adducts, which are crystalline, simplifying preparation and storage. These salts are stable substitutes for liquid aldehydes and ketones that have been effectively employed in reductive amination,
synthesizing aza‐heterocycles and hydrazones within mechanochemistry. The technique's effectiveness broadens the substrate scopes, simplifies purification, reduces reaction times, and delivers good product yields. Additionally, the thermal stability of the bisulfite adducts has been confirmed through TGA (Thermogravimetric analysis) analysis.
Our research has demonstrated that mechanochemical activation is more effective with solid reagents. We have showcased the
practicality of Bertagnini's salts, also called aldehyde‐bisulfite adducts, which are crystalline, simplifying preparation and storage. These salts are stable substitutes for liquid aldehydes and ketones that have been effectively employed in reductive amination,
synthesizing aza‐heterocycles and hydrazones within mechanochemistry. The technique's effectiveness broadens the substrate scopes, simplifies purification, reduces reaction times, and delivers good product yields. Additionally, the thermal stability of the bisulfite adducts has been confirmed through TGA (Thermogravimetric analysis) analysis.
Efficient sodium ion storage in graphite is as yet unattainable, because of the thermodynamic instability of sodium ion intercalates–graphite compounds. In this work, sodium fluorozirconate (Na3ZrF7, SFZ) functionalized graphite (SFZ‐G) is designed and prepared by the in situ mechanochemical silicon (Si) replacement of sodium fluorosilicate (Na2SiF6, SFS) and functionalization of graphite at the same time. During the mechanochemical process, the atomic Si in SFS is directly replaced by atomic zirconium (Zr) from the zirconium oxide (ZrO2) balls and container in the presence of graphite, forming SFZ‐G. The resulting SFZ‐G, working as an anode material for sodium ion storage, shows a significantly enhanced capacity of 418.7 mAh g−1 at 0.1 C‐rate, compared to pristine graphite (35 mAh g−1) and simply ball‐milled graphite (BM‐G, 200 mAh g−1). In addition, the SFZ‐G exhibits stable sodium‐ion storage performance with 86% of its initial capacity retention after 1000 cycles at 2.0 C‐rate.
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