Sol-gel synthesis of vanadium pentoxide nanoparticles in air- and water-stable ionic liquids

摘要

Vanadium pentoxide (V_20_5) nanoparticles were synthesized at moderate reaction temperatures by hydrolysis of VO[OCH(CH_3)_2]_3 in two different air- and water-stable ionic liquids with the same anion: l-butyl-l_methyl pyrrolidinium bis(trifluoromethylsulfonyl)amide ([PY_1,4]Tf_2N) and 1-ethyl-3-methylimidazolium bis(tri_fluoromethylsulfonyl)amide ([EMIM]Tf_2N) via the sol-gel method using acetone and isopropanol either as refluxing solvents or as co-solvents. The cation type of the ionic liquid affects the crystallinity, morphology, and surface area of the produced nanoparticles: [Py_1,4]Tf_2N gave products with higher crystallinity especially with acetone as a refluxing and co-solvent, while [EMIM]Tf_2N gave a clear mesoporous morphology with isopropanol as a refluxing solvent. Ionic liquids affect the key factors (morphology and surface area) that make V205 an attrac_tive material as catalyst and/or cathodic material for lithium ion batteries.