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Synthesis of Vanadium Oxide Nanofibers with Variable Crystallinity and V5+/V4+ Ratios
ACS Omega ( IF 3.7 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1021/acsomega.7b01061
Raúl Berenguer 1 , María Olga Guerrero-Pérez 1 , Isabel Guzmán 1 , José Rodríguez-Mirasol 1 , Tomás Cordero 1
Affiliation  

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 V4+/V5+ ratios and crystallinity. The method involves the exclusive electrospinning of water-free NH4VO3-saturated solutions including a reductant. Subsequent air-annealing under suitable conditions yields vanadium oxide fibers of 20–90 nm diameter and 10–50 m2/g surface area. The presence of the reductant gives rise to VOx nanofibers with a considerable proportion of V4+. Then, the right choice of the calcination heating rate and temperature permits to modify the V4+/V5+ ratio as well as the crystalline phase and crystallite size of the fibers. With the proposed methodology, long-range continuous single-phase orthorhombic V2O5 and monoclinic V3O7 nanofibers are obtained.

中文翻译:

可变结晶度和V 5+ / V 4+比的氧化钒纳米纤维的合成

量身定制钒氧化物(VOx)的形态,化学和物理特性对于优化其在当前和未来应用中的性能至关重要。本文稿提出了一条新的途径来获得具有不同V 4+ / V 5+比和结晶度的VOx纳米纤维。该方法涉及包括还原剂的无水NH 4 VO 3饱和溶液的独家静电纺丝。随后在合适的条件下进行空气退火,可制得直径为20-90 nm的氧化钒纤维,表面积为10-50 m 2 / g。还原剂的存在会产生具有相当大比例的V 4+的VOx纳米纤维。然后,正确选择煅烧加热速率和温度可以改变V 4+ / V 5+比例以及纤维的结晶相和微晶尺寸。利用所提出的方法,获得了长程连续单相正交V 2 O 5和单斜V 3 O 7纳米纤维。
更新日期:2017-11-09
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