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Tailoring the morphological, chemical, and physical properties of vanadium oxides (VOx) is crucial to optimize their performance in current and future applications. The present contribution proposes a new route to obtain VOx nanofibers with different V 4+ /V 5+ ratios and crystallinity. The method involves the exclusive electrospinning of water-free NH 4 VO 3 -saturated solutions including a reductant. Subsequent air-annealing under suitable conditions yields vanadium oxide fibers of 20-90 nm diameter and 10-50 m 2 /g surface area. The presence of the reductant gives rise to VOx nanofibers with a considerable proportion of V 4+ . Then, the right choice of the calcination heating rate and temperature permits to modify the V 4+ /V 5+ ratio as well as the crystalline phase and crystallite size of the fibers. With the proposed methodology, long-range continuous single-phase orthorhombic V 2 O 5 and monoclinic V 3 O 7 nanofibers are obtained.

Synthesis of Vanadium Oxide Nanofibers with Variable Crystallinity and V5+/V4+ Ratios

Synthesis of Vanadium Oxide Nanofibers with Variable Crystallinity and V⁵⁺/V⁴⁺ Ratios