Enhancing photocatalytic activity by tuning the ratio of hexagonal and orthorhombic phase Nb2O5 hollow fibers

A novel Nb2O5/Bi2WO6 heterojunction photocatalytic oxidative desulfurization catalyst with high visible light-induced photocatalytic activity

“…The band gaps for Bi 2 WO 6 , Nb 2 O 5 and 5 wt% Nb 2 O 5 /Bi 2 WO 6 were estimated as 2.73 eV, 3.07 eV and 2.75 eV, respectively. Here Nb 2 O 5 is orthorhombic, the band gap of it is less than 3.2 eV, which is consistent with the related report 36. Based on the band gaps it can be concluded that here Bi 2 WO 6 is an apparent visible light introduced sample.…”

“…Niobium oxide (Nb 2 O 5 ), as n-type transition oxide semiconductor, has been widely used in many elds, such as photocatalytic hydrogen production, photodegradation of organic contaminants and so on. 17,18 However, for the single-phase Nb 2 O 5 , the low quantum yield caused by the rapid recombination of photogenerated electron and hole limited their application. To address this concern, some researchers loaded some amounts of metal or non-metal to Nb 2 O 5 .…”

A simple growth method for Nb2O5 films and their optical properties

“…17 Experimentally measured bandgaps for films range from 3 to over 4 eV depending on the structural phase, grain size, and morphology of the Nb 2 O 5 film as well as the exponent used in the Tauc plot. 8,23 Our measured bandgap of 3.65 eV is close to that measured from single crystalline Nb 2 O 5 nanorods grown by hydrothermal technique 18 using UV-Vis (note that the exponent of αhν used in that work was 2 instead of ½). Our value is also comparable to the value of 3.7 eV determined for pulsed laser deposited Nb film exposed in air and measured by ultraviolet photoelectron spectroscopy.…”

“…8 The extended sol-gel method was also used to form nanocrystalline Nb 2 O 5 films. 9 Other nanostructures synthesized by chemical processes in the form of nanowires, [10][11][12] nanorods, [13][14][15] nanotubes, [16][17][18] nanobelts, 19,20 nanopores, 21 nanopowders, 22 and nanohollow fibers 23 have been reported. A wide range of potential applications has been demonstrated: catalysis, 24 gas sensors, 12,21 electrochromic windows, 25 photodetectors, 19 electron field emitters, 11 and solid oxide fuel cells.…”

Synthesis of Self‐Ordered Tantalum‐Niobium Mixed Oxide Nanotubes and Their Use for Clean Hydrogen Production

“…The XRD spectrum exhibits different diffraction peaks at 2θ of ca. 22.5°, 28.1°, 36.6°, 46.1°, 49.6°, 55.0°, 63.3°, and 69.1° corresponding to the (001), (100), (101), (002), (110), (102), (201), and (112) plans with interplaying distances (d) of 3.94, 3.17, 2.45, 1.96, 1.83, 1.67, 1.46, and 1.35 Å, respectively, characteristic of hexagonal Ta 2 O 5 (JCPDS 19‐1299) and pseudo‐hexagonal TT−Nb 2 O 5 (JCPDS: 28‐0317) with space group: P 6/ mmm , in accordance with the HRTEM outcomes [27–30] …”