Our latest research
Bimetallic MoFe phosphide catalysts for the hydrogen evolution reaction
Guboova, A., Orinakova, R. et al. In this work, highly efficient and stable (bi)metallic phosphides were prepared by a facile, flexible, and controllable sol-gel method followed by sintering. This novel approach allowed to avoid complicated and dangerous phosporization using, e.g. red phosphorus. The doping of the MoP catalysts with Fe was used to further boost their catalytic performance. Monometallic MoP and Mo3P, as well as bimetallic MoFeP were tested in both acidic and alkaline environments and showed remarkable results.
Mechanical and Degradation Behavior of Zinc-Based Biodegradable Metal Foams
Kádár, Csilla, Gorejová, Radka, Kubelka, Pierre, Oriňaková, Renata Orbulov, Imre Norbert Zinc has gained interest as a biodegradable material due to its adequate degradation behavior under physiological conditions and acceptable biocompatibility. However, during the use of zinc as a degradable orthopedical implant, the mechanical properties are expected to change while the implant needs to maintain its function and mechanical support for 12–24 months with the load gradually transferred from the degrading implant to the healing bone. For such investigation, six different kinds of open-cell zinc foams are fabricated by a modified investment casting method displaying different pore densities and strut thicknesses. Compressive properties and corrosion behavior in simulated body fluids are studied to determine the map of the most relevant parameters that influence the degradation properties.
Novel Cu(II)-based metal–organic framework STAM-1 as a sulfur host for Li–S batteries
Niščáková V. Almáši M. Capková D. Kazda T. Čech O. Čudek P. Petruš O. Volavka D. Oriňaková R. Fedorková A.S. Send mail to Fedorková A.S.Due to the increasing demand for energy storage devices, the development of high-energy density batteries is very necessary. Lithium–sulfur (Li–S) batteries have gained wide interest due to their particularly high-energy density. However, even this type of battery still needs to be improved. Novel Cu(II)-based metal–organic framework STAM-1 was synthesized and applied as a composite cathode material as a sulfur host in the lithium–sulfur battery with the aim of regulating the redox kinetics of sulfur cathodes. Prepared STAM-1 was characterized by infrared spectroscopy at ambient temperature and after in-situ heating, elemental analysis, X-ray photoelectron spectroscopy and textural properties by nitrogen and carbon dioxide adsorption at − 196 and 0 °C, respectively.
A study of the mechanism of the hydrogen evolution reaction catalysed by molybdenum phosphide in different media
Podrojková N. Podrojková N. Gubóová A. Streckova M. Oriňaková R. The electrochemical decomposition of water is an effective method of green hydrogen production due to the purity and renewability of the process. The production of hydrogen occurs through the hydrogen evolution reaction (HER), and the process may be facilitated by using proper catalysts. Transition metal phosphides (TMPs), especially MoP, can potentially replace expensive Pt-based catalysts. However, most studies deal with experimental research without DFT simulations, and the process's mechanism is not described in detail. Therefore, this study aims to investigate the catalytic performance and reaction mechanism of an MoP catalyst for HER across all pH ranges and combine electrochemical analysis with simulations to gain deeper mechanistic insights.
