15 documents found, page 1 of 2

Evolution of atomically dispersed co-catalysts during solar or UV photocatalysi...

ABSTRACT: 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...

ABSTRACT: 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 ...

Novos nanocompósitos de óxido de titânio para a produção de hidrogénio solar

RESUMO: Neste trabalho foram sintetizados uma série de novos compósitos de TiO2-rGO e TiO2-g-C3N4, como base para o desenvolvimento de fotocatalisadores ativos na produção de hidrogénio solar a partir de soluções aquosas de etanol. Os compósitos foram dopados com metais nobres e de transição (Pt, Au e Cu), tendo sido estes fotodepositados a partir dos respetivos sais. Para 6 h de irradiação UV, o volume de gás ...

Reducing Nafion content in PEMFCs low loading catalyst inks using surface funct...

Low load Pt catalyst with surface functionalised carbon supports for PEM fuel c...

ABSTRACT: Current US DOE 2020 targets for electrocatalysts aim for a total platinum group metals (PGM) loading of 0.125 mgcm-2 on membrane-electrode assemblies. The catalysts are expected to endure an elevated number of load cycles in order to comply with the expected 5000 h stack lifetime. At the stated PGM low loading attributes of performance, power and durability, as well as costs, are simultaneously requir...

Photocatalytic hydrogen production using noble and transition metals surface mo...

ABSTRACT: A large number of photocatalytic materials have been studied for water splitting since the seminal work of Fujishima and Honda1, showing great potential for solar energy conversion, including H2 production. The irradiation of a suspension of semiconductor oxides, as is the case of TiO2, presents attracting features but also stringent requirements regarding materials properties, including the tailoring...

Enhancing Pt electrocatalytic activity by surface functionalization of carbon s...

Preliminary results are presented for Pt deposited on 4-aminobenzenesulphonic acid-functionalized carbon, Pt/C_ABSA. Vulcan XC-72R was functionalized with the objective of influencing the dispersion of catalyst nanoparticles and to decrease the resistance of three phase boundaries, by introducing sulphonic groups. Electrochemical characterization of the supported catalyst was done in a 0.5 M sulphuric acid solu...

Enhancing Pt electrocatalytic activity by surface functionalization of carbon s...

Preliminary results are presented for Pt deposited on 4-aminobenzenesulphonic acid-functionalized carbon, Pt/C_ABSA. Vulcan XC-72R was functionalized with the objective of influencing the dispersion of catalyst nanoparticles and to decrease the resistance of three phase boundaries, by introducing sulphonic groups. Electrochemical characterization of the supported catalyst was done in a 0.5 M sulphuric acid solu...

Electrocatalitic activity of platinum deposited on carbon functionalized with s...

Results are presented for Pt deposited on 4-aminobenzenesulphonic acid-functionalized carbon, Pt/C_ABSA. Vulcan XC-72R was functionalized in order to influence catalyst dispersion and decrease the resistance of three phase boundary, by introducing sulphonic groups and lessening the amount of Nafion® added to the catalyst layers. Electrochemical characterization of the supported catalyst was done in a 0.5 M H2SO...