Polymorphic phase study on nitrogen-doped TiO₂ nanoparticles: effect on oxygen site occupancy, dye sensitized solar cells efficiency and hydrogen production

Abstract

In this work we show that phase formation and oxygen substitution can be controlled by the source of nitrogen used during the synthesis of TiO2 nanoparticles.

Tuning Anatase-Rutile Phase Transition Temperature: TiO2/SiO2 Nanoparticles Applied in Dye-Sensitized Solar Cells

“…In addition, the surface area and pore volume is found to increase along with the increase of SiO 2 content, from S3C to S10C. This result corroborates with the literature, indicating that silica affords a surface area to SiO 2 /TiO 2 [6]. For S0C, the pore size is related to the agglomeration of large particles, as observed in the TEM images (Figure 1(e)) [9].…”

“…One of the main components of a DSSC is the nanocrystalline mesoporous photoanode [5]. So far, the most efficient devices are assembled with TiO 2 photoanodes in anatase phase, allowing the fastest charge transfer rates [6,7]. TiO 2 presents adequate energy gap, high surface area, adequate pore size, high pore volume, nanometric particle size, crystal size, and tunable doping level [8].…”

“…SiO 2 is mainly applied in the form of particles to increase porosity and to enhance light scattering in TiO 2 photoanodes. Recently, the literature reported the preparation of TiO 2 /SiO 2 mixed oxides using the sol-gel method and ball milling to decrease the TiO 2 particle size [6,9]. In these studies, silica moieties were found to be well dispersed and contributed to maintain the anatase phase even after thermal treatment at 500°C [18][19][20][21].…”

Degradation of selected industrial dyes using Mg-doped TiO2 polyscales under natural sun light as an alternative driving energy

“…3, spectra (a) and (b) indicate the XRD patterns of Mg-doped TiO 2 particles and pure TiO 2 respectively. XRD pattern of Mg-doped TiO 2 polyscales are dominantly indexed to JCPDS files 84-1285 and 78-2485; it confirmed the mixed phases of anatase (84-1285) and rutile (78-2485) crystal structures (Kohlrausch et al 2015;Devi and Kavitha 2014;Shivaraju et al 2010a, b;Harikumar et al 2013). Dominant peaks of anatase and rutile are sharp and clearly observed particularly at 2h of 25.2 (101) and 27.2 (110), respectively.…”

Effect of anodisation time and thermal treatment temperature on the structural and photoelectrochemical properties of TiO2 nanotubes

“…Consequently, the photoelectrochemical performance of the TiO 2 nanotubes will be improved if total resistance (R total = R 1 + R 2 + R 3 ) is small [40]. The samples annealed at 400 C, 500 C and 600 C presented total resistance of 420 Ω, 534 Ω and 1080 Ω, respectively.…”