To enhance the high-rate capability of nanoparticulate TiO2 (anatase) 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 C. The combined use of both additives in a total amount of merely 2.5 wt. % leads to an improvement of more than 70 mA h/g at 60 C. The underlying mechanisms for these significant effects are briefly discussed.
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