Dynamic heterogeneity in transition metal oxide cathodes

Band offsets in transition-metal oxide heterostructures

We measured valence band offsets in Ta2O5–WO3, Ta2O5–Nb2O5 and WO3–Nb2O5 heterostructure couples by in situ x-ray photoelectron spectroscopy, immediately following the bi-layer growth in ultra-high vacuum. Conduction band offsets were estimated using the measured valence band offsets in conjunction with the literature values for the respective band gaps. The offsets between Ta2O5 and WO3 and be...

Antimicrobial Effect of Transition Metal Oxide Nanoparticles

Transition-metal doped zinc oxide nanowires.

The introduction of impurity atoms into semiconducting materials is the primary method for controlling the properties of the semiconductor, such as band gap or electrical conductivity. This practice is routinely performed with bulk semiconductors and, more recently, has been extended to nanoscale semiconductors as well. In particular, II–VI and III–V semiconductors that have been doped with tra...

New Developments in Oxide-coated Cathodes

The first of these articles deals with oxide-coated cathodes designed to be loaded with current densities several times higher than ordinary oxide-coated cathodes can withstand, and which yet have a life of a few thousand hours. Although these new cathodes cannot rival the L type of dispenser cathode as regards their permissible current density, they are cheaper and have a lower operating tempe...

Triple Phase Boundaries in Solid-Oxide Cathodes

Component potential modelling based on solid-oxide electrochemistry is used to study a single-particle configuration where a hemispherical LSM particle sits on a YSZ electrolyte half-space. The primary comparison is between two pathways: one where oxide ions travel on the particle surface; the other where these ions travel through the bulk particle interior. The systems that model each of the p...