Christel Laberty-Robert - Impact of Electrodes Nanostructuration on Photoelectrochemical Performances
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Hydrogen ispresented by some industrialists and managers as a potential pillar of theecological 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 onlymakes sense if it is produced in a decarbonized way. In this context, this talkwill focus on hydrogen production from renewable sources, solar and water. Theperformance (absorption of light, creation of photo-charges, their migrationand their reactivity with water) of the photoelectrodes depend strongly on thechemistry, structure and microstructure of the materials used. All thesephysical-chemical parameters can be trigger through a judicious control ofprocessing parameters. This talk will focus primarily on three differentprocessing approaches based on solution chemistry for synthesizing efficientand durable photo-electrodes (Mo-BiVO4, TiO2 and CuO/Cu2O).The performance of the photoelectrodes will be discussed as function ofstructure, microstructure (porosity, particle size, thickness) andhetero-structure. More importantly, for comparing the performance of the three TiO2polymorphs, a judicious photoelectrodes’ manufacturing is developed in order tosolely measure the impact of the structure keeping all the other parameters(porosity, thickness and particle size) constant.
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