It has been shown that in hybrid polymer-inorganic photovoltaic devices not all the photogenerated excitons dissociate at the interface immediately, but can instead exist temporarily as bound charge pairs (BCPs). Many of these BCPs do not contribute to the photocurrent, as their long lifetime as a bound species promotes various charge carrier recombination channels. Fast and efficient dissociat...

The phosphor-converted light-emitting diode technique is an important solid-state illumination strategy. Sulfide-based materials are the most often employed red phosphors, but they are chemically unstable and present lower efficiency in comparison to the blue and green phosphors. Therefore, it is important to find a new red phosphor source that can emit intense red light while absorbing light i...

The vapor-phase selective oxidation of propylene (H2C CHCH3) to acrolein (H2C CHCHO) was investigated over supported V2O5/Nb2O5 catalysts. The catalysts were synthesized by incipient wetness impregnation of V-isopropoxide/isopropanol solutions and calcination at 450 8C. The catalytic active vanadia component was shown by in situ Raman spectroscopy to be 100% dispersed as surface VOx species on ...

Although different NbOx units are present in Nb2O5-based catalysts, the correlations between these structures and activity remain unclear, which considerably hinders further development of Nb2O5 photocatalysis. Herein, we utilized N-hydroxyphthalimide (NHPI) as probe molecule to distinguish role activation C–H bond under visible light irradiation. With addition NHPI, catalysts with highly disor...

In this study, three amorphous oxide thin films are prepared by an electron beam evaporation combined with ion-assisted deposition technique. With the aid of optical flux mapping method, film thickness distribution good uniformity can be obtained appropriate coating masks. Three metal single-layer SiO2, Ta2O5 and Nb2O5, respectively. These were deposited on a substrate holder radius 275 mm that...

Rationally designed heterostructures provide attractive prospects for energy storage electrodes by combining different active materials with distinct electrochemical properties. Herein, through a phase separation strategy, heterostructure of SnO2 encapsulated amorphous Nb2O5 is spontaneously synthesized. Insertion-type anode outer shell, playing as reaction containers and fast ionic pathways, p...

The oxidation thermodynamics of Ti-Nb alloys were studied as a step towards improving our general understanding the behavior in complex refractory for high temperature applications. Density Functional Theory (DFT) was utilized and phonon normal mode frequencies calculated via harmonic approximation to analyze stability several phases including mixed oxides function both oxygen chemical potentia...