We have identified accumulation of charged defects at domain walls in ferroelectric BiFeO3. This finding explains the p-type hopping conduction at the domain walls in BiFeO3 and thus represents the missing piece for explaining the intriguing electrical properties of domain walls in ferroelectrics.
COBISS.SI-ID: 29936679
We doped the surface of the ordered PtCu3 alloy with gold in a controlled manner, which was directly confirmed with the help of transmission electron microscopy. The gold doped catalyst (containing the so-called PtAu skin) was then systematically compared to its starting version of catalyst (PtCu3/C). The only difference between the materials was the approximately 1 %atomic of gold. During its operation the gold doped material exhibited substantially less copper dissolution, which was directly confirmed with an advanced analytical method EFC-ICP-MS. Additionally, the gold doped material also exhibited less CO2 oxidation of the high surface area carbon support, as confirmed with another advanced analytical method - SFC-OLEMS.
COBISS.SI-ID: 5864218
The dynamics of degradation of selected alloyed electrocatalyst (Cu3Pt) was studied using 3-D atomic simulation based on Kinetic Monte Carlo modeling (KMC). Model predictions were verified using a range of advanced experimental techniques (EXAFS, STEM, SEM, on line coupled ICP-MS analytics with electrochemistry). New insights into degradation phenomena of ordered alloys compared to disordered counterparts were gained.
COBISS.SI-ID: 5951258
When electronegative atoms adsorb on a more electropositive metal surface, charge transfer occurs and adatoms become negatively charged, typically resulting in repulsive lateral interactions. However, in the case of O on Al surfaces, the opposite occurs and the lateral interactions between adatoms are attractive. We demonstrate that the surprising attractive interactions are a consequence of a simple electrostatic stabilization that stems from an interplay between Coulombic interactions and geometric effects; that is, there exists a critical adatom height above the surface below which the lateral interactions are attractive. We argue that this picture is generally applicable for electronegative adatoms on metal surfaces provided that (i) the adsorption bonding is sufficiently ionic and (ii) the adatoms are sufficiently small to come close enough to the surface.
COBISS.SI-ID: 29992743
We developed a novel route for synthesis of poly(hydrobenzoquinonyl-benzoquinonyl sulfide) polymer (PHBQS). The material was found very appropriate for potential use in Mg batteries. The average working voltage in a Mg cell was about 2 V whereas the maximum specific capacity was 158 mAh/g. Both values are among the best values published so far in the field of Mg batteries
COBISS.SI-ID: 5966362