TiO2: Cr nanopowders for hydrogen sensing

Efficient dye-sensitized solar cells based on CNTs and Zr-doped TiO2 nanoparticles

“…First, introduction of Zr with optimum percentage into TiO 2 lattice may improve its photoresponse characteristic by introducing additional energy levels within TiO 2 band gap. Zr dopant modifies the electronic structure of TiO 2 and forms localized acceptor levels in the forbidden band gap, resulting in modification of electron/hole concentration and, therefore, decrease the internal electrical resistances [40]. Therefore, this cell showed the highest fill factor of 62.6% amongst all cells.…”

Controlling electron injection and electron transport of dye-sensitized solar cells aided by incorporating CNTs into a Cr-doped TiO2 photoanode

“…Chromium dopant modifies the electronic structure of TiO 2 and forms localized acceptor levels in the forbidden band gap. This would modify the concentration of electrons and electron holes and leads to a decrease in the internal electrical resistances [12]. Secondly, as motioned in Section 3.2, the crystal growth of TiO 2 was hindered by Cr introduction, resulting in reducing the average crystallite size of the films.…”

“…They reported that incorporation of Cr produces a progressive shift of the absorption threshold towards the visible region. Lyson et al [12] synthesized Cr-doped TiO 2 nanoparticles (0.1-10 at.%) by a liquidfed one-step flame spray synthesis. The band gap was shifted from about 3.0 eV for undoped TiO 2 to about 1.5 eV for 10 at.% Cr-doped TiO 2 .…”

Hydrogen Leakage Sensing and Control: (Review)

“…Figure 2 shows the schematic diagram of MOX sensor [3]. The performance of a MOX sensor can be permanently corrupted when exposed to certain silicon compounds (which may include common industrial sealants and lubricants) [32][33][34][35][36][37][38][39][40]. These sensors typically need oxygen for stable responses and should not been widely applied to process streams or very high concentrations of H 2 [41], thus these devices cannot be readily installed in a nitrogen-purged environment.…”

“…The system could detect the presence of hydrogen and transmitting the detected data wireless for monitoring, while obtaining the necessary power for operation through energy scavenging devices. B Lyson et al[36], studied the gas sensing properties of nano-crystalline TiO 2 : Cr nano-powders obtained by Flame Spray Synthesis (FSS). This method was used because it allowed us to obtain crystalline powders in a single step.…”