Van der Waals heterostructures combining hexagonal boron nitride (h-BN) and graphene offer many potential advantages, but remain difficult to produce as continuous films over large areas. In particular, the growth of h-BN on graphene has proven to be challenging due to the inertness of the graphene surface. Here we exploit a scalable molecular beam epitaxy based method to allow both the h-BN an...

By photodeposition of CrOx on SrTiO3-based semiconductors doped with aliovalent Mg(II) and functionalized Ni/NiOx catalytic nanoparticles (economically significantly more viable than commonly used Rh catalysts), an increase in apparent quantum yield (AQYs) from ∼10 to 26% overall water splitting was obtained. More importantly, deposition also enhances the stability Ni/NiO production hydrogen, a...

High critical temperature superconductivity often occurs in systems where an antiferromagnetic order is brought near $T=0$ K by slightly modifying pressure or doping. ${\mathrm{CaKFe}}_{4}{\mathrm{As}}_{4}$ a superconducting, stoichiometric iron-pnictide compound showing optimal superconducting with ${T}_{c}$ as large 35 K. Doping Ni induces decrease and the onset of spin-vortex crystal (SVC) o...

Ni/Al2O3 is an active catalysts for CO2 hydrogenation to both CH4 and CO. By doping with Ga, we succeeded in shifting the selectivity of these almost completely toward In-situ IR spectroscopy studies showed that catalyst activity directly related concentration surface hydroxyl groups are responsible adsorption formation intermediate bicarbonates formates on surface. The addition Ga improved Ni ...

The normal-state transport properties of superconducting infinite-layer nickelates are investigated within an interacting three-orbital model. It includes effective Ni-${d}_{{z}^{2}}$ and Ni-${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ bands as well the self-doping band degree freedom. thermopower, Hall coefficient, optical conductivity modeled a quasiparticle approximation to electronic states. Qualit...

Rare-earth nickelates R$^{3+}$Ni$^{3+}$O$_3$ (R=Lu-Pr, Y) show a striking metal-insulator transition in their bulk phase whose temperature can be tuned by the rare-earth radius. These compounds are also parent phases of newly identified infinite layer RNiO2 superconductors. Although intensive theoretical works have been devoted to understand origin bulk, there only few studies on role hole and ...

This research aim to optimize two kinds of cathode material, LNCA and lithium manganese rich materials (LNMC), which are potential cathodes of EV since their high theoretical specific capacity. However several drawbacks need to be improved such as their low cycling performance, unstable structure, and fast voltage fading. In this project doping other ions (Na, K, Al, Sn) replacing Ni and Mn ion...

Chemical doping offers promise as a means of tailoring the electrical characteristics of organic molecular compounds. However, unlike for inorganic semiconductors used in electronics applications, controlling the influence of dopants in molecular complexes is complicated by the presence of multiple doping sites, electron acceptor levels, and intramolecular correlation effects. Here we use scann...

Chemical and magnetic states of iron doped tin oxide (SnO2) as a diluted magnetic semiconductor (DMS) at room temperature have been investigated using 57Fe Mössbauer spectrometry, XRD and magnetometery. The influence of the doping conditions of SnO2 with iron on the generation of oxygen defects was reviewed and discussed on the basis of ab initio calculations. The magnetic properties depended o...

Motivated by the recent discovery of superconductivity in pentalayer nickelate Nd$_6$Ni$_5$O$_{12}$ [Nature Materials 10.1038], we calculate its electronic structure and superconducting critical temperature. We find that correlations are essential for pushing into doping range as they shift electron pockets above Fermi energy. As a consequence, can be described with single $d_{x^2-y^2}$ orbital...