Issue 25, 2020, Issue in Progress

Porous niobia spheres with large surface area: alcothermal synthesis and controlling of their composition and phase transition behaviour

Abstract

Submicron-sized niobia (Nb2O5) porous spheres with a high specific surface area (300 m2 g−1) and nano concave–convex surfaces were synthesized via a rapid one-pot single-step alcothermal reaction. Prolonged reaction time or high reaction temperatures resulted in a morphology change of Nb2O5 from amorphous sphere to rod crystals with hexagonal crystal phase. A similar alcothermal reaction yielded TiO2–Nb2O5 composite porous spheres, whose Ti : Nb molar ratio was controlled by changing the precursor solution component ratios. A simple thermal treatment of amorphous TiO2–Nb2O5 porous spheres consisting of 1 : 2 (molar ratio) Ti : Nb at 600 °C for 2 h induced crystal phase transfer from amorphous to a monoclinic crystal phase of submicron-sized TiNb2O7 porous spheres with a specific surface area of 50 m2 g−1.

Graphical abstract: Porous niobia spheres with large surface area: alcothermal synthesis and controlling of their composition and phase transition behaviour

Supplementary files

Article information

Article type
Paper
Submitted
22 Feb 2020
Accepted
03 Apr 2020
First published
13 Apr 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 14630-14636

Porous niobia spheres with large surface area: alcothermal synthesis and controlling of their composition and phase transition behaviour

Y. Kumabe, H. Taga, K. Kan, M. Ohtani and K. Kobiro, RSC Adv., 2020, 10, 14630 DOI: 10.1039/D0RA01704C

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