Éditeur(s) : HAL CCSD EDP Sciences
Résumé : International audience
Understanding mechanisms in DSSCs is fundamental for their improvement; this includes the nanocrystalline semiconducting layer behaviour. Different mesoporous TiO2 layers are fabricated and analyzed for possible use in DSSC solar cells. The preparations included the addition of P123 triblock copolymer as structuring agent to the synthesized anatase sol. This preparation was also mixed with Degussa P25 TiO2 nanoparticles in one case and polystyrene latex in another. Mesoporous mixed TiO2-SiO2 thin layers were also analyzed. The diverse morphologies and features are studied by microscopic techniques and by means of spectral quantum efficiency of a photoelectrochemical cell (PEC) that uses as photoelectrode the unsensitized porous TiO2 layer. Contact angle measurements are also performed. We have found that a very high specific area due to very small nanocrystals and small pores can hinder electrolyte penetration in the pores formed by TiO2 nanograins, affecting photoelectrodes efficiency. © EDP Sciences, 2015.
ISSN: 1286-0042

hal-01683213
https://hal.univ-antilles.fr/hal-01683213
DOI : 10.1051/epjap/2015150221

Éditeur(s) : HAL CCSD Luís Felipe Toledo
Résumé : International audience
Expedition Pakaihi I Te Moana was conducted in 2011 to the Marquesas Islands, lying between 07°50ʹ S and 10°35ʹ S latitude and 138°25ʹ W and 140°50ʹ W longitude. The expedition combined extensive collections and visual censuses of the shore fish fauna. A total of 74 species are added as new records for the Marquesas Islands; the coastal fish fauna of the Marquesas Islands is increased from 415 to 495 species and the number of endemic species is increased from 48 to 68 species. This increases the percentage of species-level endemism for the Marquesas Islands to 13.7%, ranking as the third highest region of endemism for coral reef fishes in the Indo-Pacific. Only two other peripheral regions, the Hawai'ian Islands and Easter Island, have higher values.
ISSN: 1809-127X

Droits : http://creativecommons.org/licenses/by-nc-nd/
hal-01223491
https://hal-univ-perp.archives-ouvertes.fr/hal-01223491
https://hal-univ-perp.archives-ouvertes.fr/hal-01223491/document
https://hal-univ-perp.archives-ouvertes.fr/hal-01223491/file/12228-51386-1-PB.pdf
DOI : 10.15560/11.5.1758