A5019609005- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Gas Sensing Nanomaterials and Sensors
- Multiferroics and related materials
- ZnO doping and properties
- Advanced ceramic materials synthesis
- Electronic and Structural Properties of Oxides
- Perovskite Materials and Applications
- Advancements in Solid Oxide Fuel Cells
- Magnetic and transport properties of perovskites and related materials
- Mesoporous Materials and Catalysis
- Copper-based nanomaterials and applications
- Transition Metal Oxide Nanomaterials
- Advanced Condensed Matter Physics
- TiO2 Photocatalysis and Solar Cells
- Aerogels and thermal insulation
- Advancements in Battery Materials
- Electrocatalysts for Energy Conversion
- Magnetic Properties and Synthesis of Ferrites
- Microwave Dielectric Ceramics Synthesis
- Adsorption and biosorption for pollutant removal
- X-ray Diffraction in Crystallography
- Advanced battery technologies research
Technische Universität Berlin
2016-2025
Egyptian Petroleum Research Institute
2022-2023
Leibniz-Institut für Werkstofforientierte Technologien - IWT
2015-2021
University of Utah
2018-2019
Advanced Ceramics Manufacturing (United States)
2019
Lawrence Berkeley National Laboratory
2017
University of California, Santa Cruz
2017
Technical University of Darmstadt
2012-2016
Overall water splitting (OWS) using particulate photocatalysts is a promising and straightforward route for producing sustainable clean hydrogen. Strontium titanate (SrTiO3) well-documented photocatalyst in both one-step two-step (Z-scheme) systems presents state-of-the-art activities. Nevertheless, SrTiO3 still has inherent restraints, such as structural imperfections insufficient optical absorption ability. This critical review summarizes the recent progress photocatalytic overall...
Contamination of water bodies is a global environmental and human health issue. Conventional treatment systems cannot efficiently eliminate organic contaminants, particularly drugs. Photocatalysis promising, environmentally friendly oxidation process for the removal such compounds. A key point choice material to be used as photocatalyst. Here, TiO2/CaTiO3/Cu2O/Cu composites were fabricated by adding different amounts (x) graphene oxide (GO) (x wt% = 1, 3, 5%) CaCu3Ti4O12 powder using...
Amorphous polymer derived silicon oxycarbide (SiOC) is an attractive candidate for Lithium ion battery anodes, as alternative to graphite, which limited a theoretical capacity of 372 mAh/g. However, SiOC tends exhibit poor transport properties and cycling performance result sparsely distributed carbon clusters inefficient active sites. To overcome these limitations, we designed fabricated layered graphene heterostructure by solvent assisted infiltration polymeric precursor into modified...
Low-cost zirconia-toughened mullite composites were prepared from investment casting shell waste and alumina. The influence of sintering temperature on the composites' properties, including crystalline phase composition, microstructure, degrees densification, mechanical radiation shielding characteristics, was investigated. results show that higher temperature, degree densification is, improving properties composites. mullite-zirconia composite sintered at 1600 °C presents a good strength,...
Metastable, i.e., kinetically favored but thermodynamically not stable, interstitial solid solutions of carbon in iron are well-understood. Carbon can occupy the atoms host metal, altering its properties. Alloying metal results stabilization FeCx phases, widening application. Pure nickel finds niche applications, mainly focusing on catalysis, while alloys widely applied, e.g., gas turbines, reactors, and seawater piping. Nickel carbide (Ni3C) is well-known stable Ni-C system displaying a...
A 5% Ni/MnO catalyst has been tested for the dry reforming of methane at different temperatures and reactant partial pressures. Changing ratio with time on stream results in a decrease deactivation rate catalyst. Graphitic carbon growth metal particle sintering have observed by applying situ transmission XRD using synchrotron radiation under actual reaction conditions. Both monoxide separately result graphitic surface carbon, which can then be oxidized dioxide. The morphology analyzed TEM,...
Quantitative in situ X-ray diffraction combination with catalytic tests dry reforming of methane (DRM) has been performed to unveil the strong structural dynamics LaNiO3 catalysts during DRM reaction. Structure–activity correlations reveal polymorphic changes rhombohedral structure first into cubic and further transient oxygen-deficient triclinic LaNiO2.7 monoclinic LaNiO2.5. These occur up 620 °C already cause considerable activity. Another intermediate structure, Ruddlesden–Popper phase...
The mechanism of multiwalled carbon nanotube synthesis from methane chemical vapor deposition on a 5% Ni/MnO catalyst is studied at 873 and 1073 K by in situ transmission XRD using synchrotron radiation supported Rietveld refinement density functional theory calculations. Upon dissociative adsorption the reaction temperature, fcc nickel lattice initially expands above temperature calibration experiment, as dissolves interstitially subsequently contracts upon graphite precipitation. At K,...
The influence of A- and/or B-site doping Ruddlesden–Popper perovskite materials on the crystal structure, stability, and dry reforming methane (DRM) reactivity specific A2BO4 phases (A = La, Ba; B Cu, Ni) has been evaluated by a combination catalytic experiments, in situ X-ray diffraction, absorption spectroscopy (XAS), photoelectron (XPS), aberration-corrected electron microscopy. At room temperature, La2NiO4 with Cu stabilizes orthorhombic structure (Fmmm) perovskite, while A-site Ba...
Particulate and gaseous air pollutants pose a threat to human health contribute climate change. By today, filters, stationary portable, are markedly improved can often provide innocuous pollution levels. After introducing the classification standards on influence of processing route its parameters resulting filter properties consequently performance discussed. Numerous tools presented adjust structural such as fiber or pore diameter, specific surface area, charge, hydrophilicity,...
Graphitic deposits anti-segregate into Ni0 nanoparticles to provide restored CH4 adsorption sites and near-surface/dissolved C atoms, which migrate the /ZrO2 interface induce local Zrx Cy formation. The resulting oxygen-deficient carbidic phase boundary assist in kinetically enhanced CO2 activation toward CO(g). This carbide mechanism allows for spillover of carbon ZrO2 support, represents an alternative catalyst regeneration pathway with respect reverse oxygen on Ni-CeZrx Oy catalysts. It...
Recent studies on ${\mathrm{In}}_{2}{\mathrm{O}}_{3}$ have revealed a rich phase diagram and led to the discovery of new polymorphs, including synthesis ambient recovery Pbcn ${\mathrm{In}}_{2}{\mathrm{O}}_{3}$. The electronic properties this are studied together with other better-known polymorphs ($Ia\overline{3}$ $R\overline{3}c$) using soft x-ray absorption emission spectroscopy, directly probing partial density states transition matrix elements. Together complementary full-potential...
We describe the development and implementation of a compact, low power, infrared heated tube furnace for in situ powder X-ray diffraction experiments. Our silicon carbide (SiC) based design exhibits outstanding thermal performance terms accuracy control temperature ramping rates while simultaneously being easy to use, robust abuse and, due its small size producing minimal impact on surrounding equipment. Temperatures air excess 1100 °C can be controlled at an better than 1%, with up 100...
We report on the synthesis of new Dion–Jacobson phase three-layer perovskite CsBa2Ta3O10 crystals by conventional solid-state reaction and fabrication their nitrided Ba2Ta3O10 nanosheets via a nitridation–protonation–intercalation–exfoliation route for visible-light-driven photocatalytic water splitting application. The two-dimensional crystal structure refined Rietveld refinement method belongs to simple tetragonal system consists corner-shared distorted TaO6 octahedra Ba cations in...