To enhance the high-rate capability of nanoparticulate anatase TiO2 formed by thermal treatment of protonated TiO2 nanotubes, we used two types of additives: RuO2 as an electronic conductive material and silica as a suppressant of particle growth during heat treatment. Both additives, when used separately, improve the high-rate performance of anatase by 25–55 mA h/g at 60 oC. The combined use of both additives in an amount of 2.5 wt. % leads to an improvement of more than 70 mA h/g at 60 oC. The underlying mechanisms for these significant effects are briefly discussed. Paper has 11 citations..
COBISS.SI-ID: 3903258
Local environment of Cu2+ in Cu2+ doped sodium titanate nanotubes (NaTiNTs) and nanoribbons (NaTiNRs) were detirmened via magnetic and electron microscopy studies. NaTiNTs and NaTiNRs were doped with Cu2+ during hydrothermal synthesis from Cu2+doped anatase TiO2 (in situ method) and by ion exchange (ex situ method). In the samples prepared via the ex situ doping method, 5-40 nm CuO nanoparticles were grown on the inner/outer surface of NaTiNTs/NaTiNRs. Evidence that Cu2+ species form complexes between titaante layers are coridanted with Na+ comes from the EPR data.
COBISS.SI-ID: 21989927
It is shown that the rate performance of anatase TiO2 can be significantly improved by addition of a small amount (fewpercent) of carefully selected oxides such as silica or RuO2. Specifically, silica serves primarily as a suppressant of particle growth during heating of anatase precursor—in our case titania nanotubes.The addition of RuO2 is supposed to enhance the electronic conductivity. The beneficial impact of the combined use of silica and RuO2 in the preparation of anatase-based electrodes is also demonstrated on a commercially available sample of anatase.
COBISS.SI-ID: 4071706
An EELS study of the O-K and Ti L2,3 edges for anatase-, rutile-, and titanate nanotubes (NaTiNTs) showed that however the electronic structure does not correspond to that of either of the titania precursors. Crystal-field splitting is comparable with anatase but the 3d occupation number is closer to that of rutile. In addition, Ti L2,3 spectroscopic NaTiNTs are composed of Ti4+ ions in an octahedral symmetry with the oxygen ligands, signatures indicate that the octahedron connectivity of the tubes is different to that of the reference titania.
COBISS.SI-ID: 22770471
The purpose of the conducted research was to determine the position of Cr3+ ions in sodium-titanate nanoribbons and nanotubes, which were synthesized from TiO2 doped Cr3+ in NaOH solution under hydrothermal conditions. Synthesized nanomaterials were characterized by HAADF-STEM and cathodoliminiscence (CL) measurements. With CL measurements we proved that Cr3+ partially substituted Ti4+ in TiO6 octahedra. Substitution of Cr3+ was revealed by the characteristic intraionic emission line at 1.791 eV.
COBISS.SI-ID: 23591975