34 documents found, page 1 of 4
The H2Excellence Project-Fuel Cells and Green Hydrogen Centers of Vocational Ex...
Gano, António; Ribeiro Pinto, Paulo Jorge; Esteves, M. Alexandra; Rangel, Carmen M.ABSTRACT: The demand for green hydrogen (H2) and related technologies is expected to increase in the coming years, driven by climate changes and energy security of supply issues, amid the European and global energy crises. The European Green Deal and REpowerEU Plan have identified H2 as a key pillar for reaching climate neutrality by 2050 and for the intensification of hydrogen delivery targets, bringing the la...
Evolution of atomically dispersed co-catalysts during solar or UV photocatalysi...
Capelo, Anabela; Fattoruso, Domenico; Valencia-Valero, Laura; Esteves, M. Alexandra; Rangel, Carmen M.; Puga, AlbertoABSTRACT: The evolution of metal/titania photocatalysts during photocatalytic H-2 evolution is herein studied. Samples containing atomically dispersed Pt co-catalysts (single atoms, clusters and sub-nanoparticles) formed after calcination were compared to pre-reduced analogues mostly having metallic nanoparticles (diameters >1 nm) during ethanol photoreforming under either UV-rich irradiation or natural sunligh...
Dielectric UV filters for protection of fire-resistant glass based on intumesce...
Silva, Ricardo Magno Lopes; Hashim, Hurraira; Roy, Deepto; Oliveira Fernandes, Carolina; Oliveira, Kevin; Leitão Pinheiro, Xavier AlexandreABSTRACT: Structures such as OLEDs, perovskite solar cells, intumescent glasses, and other components in modern devices and buildings contain materials suscep-tible to degradation when exposed to UV radiation, requiring protection to with-stand outdoor environmental conditions. In this work, multilayer coating config-ured as a Bragg Reflector on glass is employed as spectral filtering to protect the intumescent...
Fire-resistant materials: characterization and thermal behavior of intumescent ...
Donato, Mariana; Esteves, M. Alexandra; Capelo, Anabela; Oliveira, Fernando; Ferreira, Cristina; Alves, Isabel N.; Morgado, Vanessa; Correia, Jose B.
The H2Excellence Project: Fuel Cells and Green Hydrogen Centers of Vocational E...
Gano, António; Pinto, P.J.R.; Esteves, M. Alexandra; Rangel, C. M.ABSTRACT: The demand for green hydrogen (H2) and related technologies is expected to increase in the coming years mainly framed by drivers such as climate change and energy security of supply amid the European and global energy crises. REpowerEU Plan called for an intensification of hydrogen delivery targets, that will bring large-scale adoption of hydrogen production and applications in various sectors, stress...
LNEG, bringing Green H2 research to the economy [Comunicação oral]
Portillo, Juan C. C.; Barbosa, Juliana; Simoes, Sofia; Oliveira, Paula; Amorim, Filipa; Simões, Teresa; Rodrigues, Carlos; Catarino, Justina
Synthesis, photophysical and electrochemical properties of π-conjugated pyrene ...
Barros, Helio; Esteves, M. Alexandra; Brites, Maria JoãoABSTRACT: Pyrene molecule, with excellent photophysical properties (strong absorption cross section, excellent emission properties and a long-excited state lifetime), excellent thermal and photochemical stability, has been widely used as a building block for the synthesis of pyrene-based fluorophores for optoelectronic applications. In this work, we report the synthesis of two series of pyrene-pi-A compounds, s...
Synthesis and photophysical properties of tetraphenylethylene derivatives as lu...
Barros, Helio; Esteves, M. Alexandra; Brites, Maria JoãoABSTRACT: Luminescent Down-Shifting (LDS) is an optical approach applied in several photovoltaic (PV) technologies in which high energy solar radiation is converted to a wavelength region where the response of the photovoltaic devices is better. The use of LDS layers on organic photovoltaics (OPV) could serve two purposes: to prevent cell degradation by filtering the incident ultraviolet (UV) radiation and to i...
Synthesis and photophysical properties of tetraphenylethylene derivatives as lu...
Barros, Helio; Esteves, M. Alexandra; Brites, Maria JoãoABSTRACT: Luminescent Down-Shifting (LDS) is an optical approach applied in several photovoltaic (PV) technologies in which high energy solar radiation is converted to a wavelength region where the response of the photovoltaic devices is better. The use of LDS layers on organic photovoltaics (OPV) could serve two purposes: to prevent cell degradation by filtering the incident ultraviolet (UV) radiation and to i...
TiO2-reduced graphene oxide-Pt nanocomposites for the photogeneration of hydrog...
Esteves, M. Alexandra; Fresno, Fernando; Fernandes, Vitor; Oropeza, Freddy E.; O'Shea, Victor A. de la Peña; Rangel, C. M.ABSTRACT: The production of hydrogen by photocatalysis presents attractive features but also stringent requirements of materials properties. A series of TiO2-based photocatalysts containing reduced graphene oxide (rGO) and plat-inum, TiO2-rGO(x)-Pt(y) (x=0-5 wt%; y=1.5, 2.5, 3.8 wt%), were synthesized by a simple two-step procedure. The ternary composites exhibited promising performance for hydrogen generation,...