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Nombre de programmes trouvés : 1382
Conférences

le (41m28s)

Olivier Joubert - Brief Overview of Current French Hydrogen Research Activities, Focus on Materials

Twenty years ago, the French scientific community working in the field of hydrogen, started to federate under the leadership of the CNRS. It took the form of successive Research Grouping (GdR) bringing together experts in solid oxide fuel cell (SOFC), proton exchange polymer membrane (PEMFC) fuel cells, hydrogen storage and systems mainly from CNRS but also from CEA. These GdRs promoted and structured an interdisciplinary field of research with excellent results.   Since January 1st of 2020, the CNRS community has formed the Research network on ...
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Conférences

le (38m38s)

Pascal Brault - Reactive molecular dynamics simulations of H2 production and conversion

Since H2 production and conversion efficiencies can be improved and monitored at the molecular scale, reactive molecular dynamics simulations (rMDS) are expected to be of great promise for understanding associated basic mechanisms. Basically, rMDS is a technique aiming at solving full trajectories of a set of atoms, molecules, nanoparticles, with the only ingredient of force fields driving interactions between relevant species.   Due to the recent growth of improved and reactive force fields such as ReaxFF and COMB3 families, it become possible to address complicated reactive process such as H2 ...
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Conférences

le (22m21s)

Sixto Malato - Solar photocatalytic hydrogen production at pilot scale

Solar energy is well-recognized as a sustainable and clean energy source. Among the various approaches to solar energy conversion, solar-driven hydrogen production is one of the most promising ways to convert solar energy into hydrogen, a storable fuel. Hydrogen is undoubtedly one of the most attractive renewable alternatives to fossil fuels for a number of reasons: (i) hydrogen can be safely stored; (ii) it is an excellent energy carrier since it can store 3 times as much energy as conventional natural gas; (iii) its combustion is environmentally friendly (no release of greenhouse ...
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Conférences

le (24m12s)

Athanasios G. Konstandopoulos - Material and Reactor Technologies for Solar Fuels

The synthesis of carbon-neutral/zero-carbon footprint fuels via solar thermochemical processes (“Solar Fuels”) represents a promising approach for the realization of a sustainable energy future. These high temperature processes (effected by concentrated solar technology) “regenerate” streams of “dead hydrogen” (H2O) and/or “dead carbon”, CO2, through thermochemical Water (WS) and/or Carbon Dioxide Splitting (CDS) into H2 and CO respectively, after contact with oxygen-deficient, “redox” materials that are thus re-oxidized. Subsequently thermal reduction of the material is applied, by raising the temperature at a higher level, thus establishing a two-step cycle. Solar CO and ...
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Conférences

le (48m0s)

Juan Matos - H2 production on 1D and 2D Carbon-containing Fe-, Co, and Ni-based foamy catalysts.

C-containing Fe-, Co-, and Ni-based catalysts have been synthesized from the controlled pyrolysis of saccharose. The topological properties of the 2D materials were significantly different from other 2D carbon-based cell structures. TEM and STEM showed that catalysts are composed by 1D and 2D morphologies, manly those with Co- and Ni, and these morphologies seems to be remaining from the pristine carbon structures in absence of metals. Carbon seems to play a template role for the growing of the metal-containing structures. Electron microscopy also showed that catalysts are composed by a high compaction ...
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Conférences

le (40m21s)

Christel Laberty-Robert - Impact of Electrodes Nanostructuration on Photoelectrochemical Performances

Hydrogen is presented by some industrialists and managers as a potential pillar of the ecological transition, particularly in the context of transport (hydrogen-powered cars, hydrogen-powered trains, hydrogen-powered airplanes, etc.), the storage of energy from intermittent renewable sources or in industry (steel and chemical industries). Using hydrogen to decarbonize the economy only makes sense if it is produced in a decarbonized way. In this context, this talk will focus on hydrogen production from renewable sources, solar and water. The performance (absorption of light, creation of photo-charges, their migration and their reactivity with ...
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Conférences

le (40m8s)

José Solla-Gullon - Recent advances and remaining challenges on the use of shape-controlled-metal nanoparticles in Electrocatalysis

The incorporation of shape-controlled metal nanoparticles in Electrocatalysis is contributing significantly to a better understanding of the correlations between surface structure and electrochemical reactivity at the nanoscale [1,2]. In this communication, some of the basic requirements to properly use these shaped metal nanoparticles in electrochemical reactions including surface cleanness, and correlations between particle shape and surface structure will be reported. Then, some recent advances in the application of these shaped nanomaterials for different electrochemical reactions of interest will be highlighted [3-5]. Finally, some of the most important remaining challenges on this ...
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Conférences

le (23m56s)

Alejandro Anson-Casaos - Photoelectrochemical characterization of C/TiO2 and C/ZnO nanomaterials in aqueous electrolyte

Carbon nanostructures, including single-walled carbon nanotubes, reduced graphene oxide, and carbon dots, are inserted in TiO2 and ZnO photoanodes with the aim of improving their activity. For the electrode assembly, TiO2 or ZnO nanoparticles, as well as carbon nanomaterials, are dispersed in a liquid and deposited on FTO by spray coating. Various mixed and layer-by-layer electrode configurations are considered. As-prepared electrodes are evaluated by photoelectrochemical (PEC) techniques, mostly cyclic voltammetry and transient photocurrent measurements.   The insertion of the carbon component improves the photocurrent response depending on the measurement conditions, ...
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