A5088521783- Hydrogen Storage and Materials
- Ammonia Synthesis and Nitrogen Reduction
- Quantum, superfluid, helium dynamics
- Catalytic Processes in Materials Science
- Advanced Chemical Physics Studies
- Hybrid Renewable Energy Systems
- Superconductivity in MgB2 and Alloys
- Boron and Carbon Nanomaterials Research
- Machine Learning in Materials Science
- Catalysts for Methane Reforming
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- High-pressure geophysics and materials
- Carbon Dioxide Capture Technologies
- Nuclear Materials and Properties
- Catalysis and Oxidation Reactions
- Electrocatalysts for Energy Conversion
- Spacecraft and Cryogenic Technologies
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetic properties of thin films
- Rare-earth and actinide compounds
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Heusler alloys: electronic and magnetic properties
- Conducting polymers and applications
Swiss Federal Laboratories for Materials Science and Technology
2016-2025
Carrier (United States)
2025
University of Zurich
2009-2024
ZHAW Zurich University of Applied Sciences
2022
ETH Zurich
2008-2022
University of Eastern Finland
2022
Lucerne University of Applied Sciences and Arts
2022
Interface (United Kingdom)
2020
Anatech
2015-2016
Flisom (Switzerland)
2014
Abstract The color changes in chemo- and photochromic MoO 3 used sensors organic photovoltaic (OPV) cells can be traced back to intercalated hydrogen atoms stemming either from gaseous dissociated at catalytic surfaces or photocatalytically split water. In applications, the reversibility of process is utmost importance, deterioration layer functionality due side reactions a critical challenge. Using membrane approach for high-pressure XPS, we are able follow reduction thin films using atomic...
Some of the authors have reported that a complex hydride, Li(BH(4)), with (BH(4))(-) anion exhibits lithium fast-ion conduction (more than 1 x 10(-3) S/cm) accompanied by structural transition at approximately 390 K for first time in 30 years since Li(2)(NH) was 1979. Here we report another conceptual study and remarkable results Li(2)(BH(4))(NH(2)) Li(4)(BH(4))(NH(2))(3) combined (NH(2))(-) anions showing ion conductivities 4 orders magnitude higher Li(BH(4)) RT, due to being provided new...
Hydrogenography optically monitors hydrogen ab- and desorption simultaneously on thousands of alloy compositions under exactly the same experimental conditions. In this way hydride-formation enthalpy map Mg–Ni–Ti–H system is determined from a compositional gradient thin film. The figure shows that region interesting hydrogen-storage materials in dark blue, with enthalpies around –40 kJ (mol H2)–1.
We investigate the stability and hydrogen desorption of NaBH4. Dynamic pcT (pressure, concentration, temperature) measurements under constant flows are used to determine thermodynamic parameters reaction. From van't Hoff equation enthalpy entropy reaction, −108 ± 3 kJ mol−1 H2 133 J K−1 released, obtained, respectively. This corresponds a decomposition temperature Tdec = 534 10 °C at 1 bar H2. The thereby occurs in one step; i.e., only plateau is visible pressure composition isotherms....
A fundamental analysis of single-component and binary CO2 H2O adsorption amine-functionalized nanofibrillated cellulose is carried out in the temperature range 283–353 K at partial pressures 0.02–105 kPa, where ultralow pressure relevant for direct capture from atmospheric air. Single-component experimental data are fitted to Toth Guggenheim–Anderson–de Boer models, respectively. Corresponding heats adsorption, derived explicit solutions van't Hoff equation, −50 kJ/mol −48.8 H2O. Binary...
The transformation from the fatuous consumption of fossil energy towards a sustainable circle is most easily marketable by not changing underlying carrier but generating it renewable energy. Hydrocarbons can be principally produced hydrogen and carbon dioxide collected biomass. However, research needed to increase energetic economic efficiency process. We demonstrate enhancement CO2 methanation sorption enhanced catalysis. preparation catalytic activity catalysts based on Ni particles in...
V2O5 based materials are attractive cathode alternatives due to the many oxidation state switches of vanadium bringing about a high theoretical specific capacity. However, significant capacity losses eminent for crystalline phases related irreversible phase transformations and/or dissolution starting from first discharge cycle. These problems can be circumvented if amorphous or glassy oxide employed. Here, we demonstrate vanadate-borate glasses as rechargeable Li-ion batteries time. The...
A massive reduction in CO
The hydrogenation of the CaH2+MgB2 composite and dehydrogenation resulting products are investigated in detail by situ time-resolved synchrotron radiation powder X-ray diffraction, high-pressure differential scanning calorimetry, infrared, thermovolumetric measurements. It is demonstrated that a Ca(BH4)2+MgH2 formed hydrogenating composite, at 350 °C 140 bar hydrogen. Two phases Ca(BH4)2 were characterized: α- β-Ca(BH4)2. α-Ca(BH4)2 transforms to β-Ca(BH4)2 about 130 °C. Under conditions...
A composite of Ag/SiO<sub>2</sub>core–shell nanoparticles 20 vol% in polydimethylsiloxane with<italic>ε</italic>′ = 5.9,<italic>E</italic><sub>b</sub>= 13.4 V μm<sup>−1</sup>,<italic>Y</italic><sub>100%</sub>= 350 kPa, and a strain at break 800% is presented.
Local measurements of the oxidation state vanadium in monoclinic BiVO4 particles by means electron energy-loss spectroscopy scanning transmission microscopy reveal a pronounced surface reduction: within 5-nm-thick shell, is reduced from +5 to about +4. Thus, charge neutrality near demands for ∼15% oxygen vacancies. Our results provide direct evidence segregation vacancies at BiVO4. This observation confirmed X-ray photoelectron spectroscopy. The experimental findings are complemented with...
External magnetic fields affect various electrochemical processes and can be used to enhance the efficiency of water splitting reaction. However, driving forces behind this effect are poorly understood due analytical challenges available interface-sensitive techniques. Here, we present a set-up based on magneto- electro-optical probing, which allows juxtapose properties electrode with current densities in situ at applied potentials fields. On example an archetypal hydrogen evolution...
We have investigated the crystal structure of Ca(BD4)2 by combined synchrotron radiation X-ray powder diffraction, neutron and ab initio calculations. shows a variety structures depending on synthesis temperature samples. An unknown tetragonal Ca(BD4)2, beta phase has been solved from diffraction data measured at 480 K sample synthesized solid-gas mechanochemical reaction using MgB2 as starting material. Above 400 K, this particularity to be almost completely into Ca(BD4)2. Seven candidates...
The solvent-free synthesis of LiBH(4) from LiH in a borane atmosphere at 120 degrees C and ambient pressures is demonstrated. source milled LiBH(4)/ZnCl(2) mixture, which Zn(BH(4))(2) generated by metathesis reaction. yield the reaction about 74 % shows that bulk taking place upon absorption LiH. This indicates formation B-H bonds limiting step for elements. Therefore, use diborane as starting reactant allows one to circumvent barrier B-B bond dissociation explains rather moderate conditions.
We demonstrate the synthesis of LiBH4 from LiH and AlB2 without use additional additives or catalysts at 450 °C under hydrogen pressure 13 bar to following equation: 2LiH + 3H2↔ 2LiBH4 Al. By applying kinetics formation is strongly enhanced compared elemental boron. The during absorption requires dissociation AlB2, i.e. a coupled reaction. observed low absorption-pressure bar, measured cycling, explained by stability in good agreement with theoretical values. Thus starting instead B has...
Surface change of α-AlH3 during the hydrogen desorption was investigated by means in situ x-ray photoelectron spectroscopy combined with thermal spectroscopy. The surface AlH3 covered an oxide layer significantly changes upon and rate increases remarkably. In this study, role on view kinetics investigated. only decomposes into Al H2 at free not bulk. Therefore, a closed prevents thermodynamically unstable from decomposition.
The widespread adoption of hydrogen as an energy carrier could bring significant benefits, but only if a number currently intractable problems can be overcome. Not the least these is problem storage, particularly when aimed at use onboard light-vehicles. aim this overview to look in depth areas linked by recently concluded HYDROGEN research network, representing intentionally multi-faceted selection with goal advancing field on fronts simultaneously. For general reader we provide concise...
We investigated the localized rotational diffusion of (BH4)− anions in LiBH4/LiI solid solutions by means quasielastic and inelastic neutron scattering. The motions are thermally activated characterized activation energies order 40 meV. Typical dwell times between jumps picosecond range at temperatures about 200 K. motion is dominated 90° reorientations around 4-fold symmetry axis tetrahedraly shaped ions. As compared to pure system, presence iodide markedly reduces increases frequencies...