A5044042040- Catalytic Processes in Materials Science
- Catalysts for Methane Reforming
- Graphene research and applications
- Catalysis and Oxidation Reactions
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Copper-based nanomaterials and applications
- Perovskite Materials and Applications
- Iron oxide chemistry and applications
- Metal-Catalyzed Oxygenation Mechanisms
- Nanomaterials for catalytic reactions
- Semiconductor materials and devices
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Electrochemical Analysis and Applications
- Advanced Nanomaterials in Catalysis
- Semiconductor materials and interfaces
- Fiber-reinforced polymer composites
- ZnO doping and properties
- Polymer Nanocomposites and Properties
- Radioactive element chemistry and processing
- Advanced oxidation water treatment
- Porphyrin and Phthalocyanine Chemistry
HUN-REN Centre for Energy Research
2015-2025
Hungarian Academy of Sciences
2017-2024
Institute for Technical Physics and Materials Science
2023
Budapest Institute
2017
The combination of the unique physical properties molybdenum disulfide (MoS
Graphitic carbon nitride (g-C3N4) proved to be a promising semiconductor for the photocatalytic degradation of various organic pollutants. However, its efficacy is limited by fast electron hole recombination, restricted quantity active sites, and modest absorption in visible range. To overcome these limitations, g-C3N4-Bi2S3 g-C3N4-ZnS composites were effectively produced utilizing starch-assisted technique. The findings from FT-IR, XRD, EDX, XPS, BET, SEM, TEM demonstrated that enhanced...
Herein, the promotion effect of only 0.3 wt% indium on 3% Ni/Al2O3 and Ni/CeO2-Al2O3 catalysts prepared by deposition-precipitation over a commercial alumina CeO2-modified support was studied. Catalyst characterization XRD, TPR, XPS, TEM, CO-DRIFTS performed. The catalytic properties were investigated coke formation analyzed under temperature ramped CH4-decomposition in Dry Reforming Methane (DRM). unique impact compared to well-known effects ceria additive. carbon deposition blocking...
As a perspective catalyst composition for methane non-oxidative decomposition/methane pyrolysis (CH4⇌C+2H2) yielding clean hydrogen and only solid carbon, the combination of nickel molybdenum on MgO support was investigated. With deliberately low Ni content strong metal-support interaction, 7%Ni4%Mo/MgO 7%Ni12%Mo/MgO catalysts monometallic references were prepared. Structural analysis performed using TPR, XRD, TEM, XPS Raman spectroscopy in reduced state after decomposition test. Catalytic...
Balanced, strong interaction of Ni–Na<sub>2</sub>O–ZrO<sub>2</sub>catalyst components under CO<sub>2</sub>reforming methane is a criterion good catalytic activity and stability.
In this paper, we report a multiscale investigation of the compositional, morphological, structural, electrical, and optical emission properties 2H-MoS
In this study, the surface and textural properties as well catalytic performance of Ni/CeO2 NiIn/CeO2 catalysts prepared by wet impregnation (WI) deposition–precipitation (DP) are investigated. The addition Ni (3.0 wt.%) resulted in a decrease specific area pore volume case WI method, possibly due to blockage mesopores. A minimal (0.25 caused further both cases. XRD analysis showed that deposited on CeO2 DP some lattice incorporation, affecting crystallinity support. H2-TPR profiles altered...
Pyrolysis (thermal anaerobic decomposition) of waste tyres is a sustainable recycling process. Its result an unstable liquid product – pyrolysis oil must be improved for economic usage. A complex microreactor system was developed upgrading/valorizing tyre oil. Following cleaning steps (distillation, resin removal, chemical preparation reactor) hydrogenated/hydrodesulfurized in the main reactor over NiMo/Al2O3 catalysts. Cheap self-made low active metal containing catalysts presented...
Abstract The heterogeneous integration with 2D materials enables new functionalities and novel devices in state‐of‐the‐art bulk (3D) semiconductors. In this work, highly uniform MoS 2 heterostructures silicon carbide (4H‐SiC) are obtained by a facile synthesis method, compatible semiconductor fab processing, i.e., the sulfurization of predeposited very‐thin (≈1.2 nm) Mo films at temperature 700 °C. Current–voltage characteristics /n + ‐4H‐SiC junctions collected conductive atomic force...
Photoelectrochemical water splitting can become efficient by grafting co-catalysts on semiconductors that improve the interfacial oxygen evolution reaction. We applied a simple non-noble metal pre-catalyst, [FeII(PBI)3]2+ (PBI is 2-(2′-pyridyl)benzimidazole ligand) for this purpose nanopyramidal BiVO4 semiconductor was morphologically optimal light harvesting, but its performance suffered from V-poor surface recombination sites. The in situ transformed to α-Fe2O3 nanoparticles V-vacant areas...
Graphitic carbon nitride (g-C3N4) is a promising heterogeneous photocatalyst in the visible range. It can be used, among others, for reductive conversion of toxic hexavalent chromium occurring various wastewaters. Its photocatalytic efficiency, however, has to improved, which realized by modification with different dopants or co-catalysts forming heterojunctions. In our work, ruthenium-modified g-C3N4 been prepared ultrasonic impregnation pristine g-C3N4, was synthesized from thiourea. The...
Enhanced PEC water splitting with an α-Fe 2 O 3 /B-C N 4 type II heterojunction. Use of pyrolytic (p-)CNT to improve photoanodic current density. Improved electrical conductivity for facile charge separation & transfer. DFT hints at a Z-scheme mechanism.
Nowadays, the study of environmentally friendly ways producing hydrogen as a green energy source is an increasingly important challenge. One these potential processes heterogeneous photocatalytic splitting water or other sources such H2S its alkaline solution. The most common catalysts used for H2 production from Na2S solution are CdS-ZnS type catalysts, whose efficiency can be further enhanced by Ni-modification. In this work, surface Cd0.5Zn0.5S composite was modified with Ni(II) compound...
The catalytic and structural changes due to the presence of 0.25 wt% indium on a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method were investigated. Catalyst characterizations XRD, TPR, XPS, TEM DRIFTS (in CO/CO2/CH4+CO2) carried out. In short (6 h) methane dry reforming tests at 650 °C both samples stable, produced essentially no carbon, but lowered activity. 4 day longevity 675 °C, stable activity was achieved In-promoted in contrast with continuous deactivation unpromoted Ni...
Herein, we compare the electrochemical and electrocatalytic properties of two selected, water-insoluble Fe(II) coordination complexes made with non-symmetric, bidentate ligands, 2-(2′-pyridyl)benzimidazole (PBI) in [Fe(PBI)3](OTf)2 (1, OTf− = trifluoromethyl sulfonate anion) 2-(2′-pyridyl)benzoxazole (PBO) [Fe(PBO)2(OTf)2] (2) . Cyclic voltammetry water/acetonitrile mixture indicates considerable activity for both compounds. However, only 1 acts as homogeneous catalyst. The have been...
Abstract Understanding the pivotal role of surface co‐catalysts is paramount in strategic design forthcoming photoelectrodes. However, nuanced impacts remain elusive, particularly promoting water oxidation reaction on hematite, especially connection to states denoted as S1 (higher energy) and S2 (lower energy). For this purpose, we tailored two isomorphous hematite nanoarrays with a thin layer amorphous copper oxide (CuOx), composed blend Cu(I) Cu(II) species, via soft electrodeposition...
In this paper, we report on the growth of highly uniform MoS 2 films, mostly consisting monolayers, SiC surfaces with different doping levels (n- epitaxy, ~10 16 cm -3 , and n + substrate, 19 ) by sulfurization a pre-deposited ultra-thin MoO x films. layers are lowly strained (~0.12% tensile strain) p-type doped (<N h >≈4×10 −3 ), due to 3 residues still present after process. Nanoscale resolution I-V analyses conductive atomic force microscopy (C-AFM) show strongly rectifying behavior...
In this study, we examined the chemical changes occurring in ground tire rubber (GTR) and on its surface as a result of gamma irradiation water, with low doses 5, 10, 15, 20, 25, 30 kGy. To better distinguish radiation caused GTR activation by irradiated also performed treatments an inert atmosphere. We mixed treated GTRs fresh rubber, after vulcanization, investigated mechanical properties conducted dose optimization. The were characterized Soxhlet-extraction cross-link density...