Highly stable anodes for electrocatalytic water oxidation based on metal oxide-polypyrrole nanocomposites

International audienc

Photocatalytic systems for hydrogen production: from molecular to inorganic

International audienc

Extremely long-distance electron transfer in porphyrin or phthalocyanine systems directly functionalized by an oligo(phenyleneethynylene) spacer

This review focuses oil a new strategy to design covalently linked and electronically coupled porphyrin systems to achieve long-range photoinduced electron transfer. We show that the attachment of a pi-conjugated bridge directly oil the meso position of the porphyrin via lit ethynyl or ethenyl linkage affords significant electronic coupling both oil the ground- and excited-states and that oligophenylencethynylenes represent suitable spacers to assist charge separation between porphyrins. They can indeed exhibit wire-like behaviour and promote fast interchromophore charge separation over distances up to 4.5 am. These recent electronically coupled dyads represent attractive photochemical systems to build more complex arrays for solar energy conversion or for molecular electronic applications. To cite this article: F. Odobel, J. Fortage, C. R. Chimie 12 (2009). (c) 2008 Academie des sciences, Published by Elsevier Masson SAS. All rights reserved

Matériaux d’électrodes stables et performants pour l’électrocatalyse par (sub)nanostructuration de catalyseurs métalliques dans un film polymère

International audienc

Synthèse et propriétés de diodes électroniquement couplées composées d'une porphyrine de zinc et d'une porphyrine d'or pour la séparation de charges

Communication par affiche intitulée (présentée par J. Fortage) : Synthèse et propriétés de diodes électroniquement couplées composées d'une porphyrine de zinc et d'une porphyrine d'or pour la séparation de charge

Valorization: from the maturation project FUELSEA to the start-up ANODINE

International audienc

ÉLECTRODE COMPRENANT UN REVÊTEMENT COMPOSITE ET PROCÉDÉ DE FABRICATION ASSOCIÉ

The invention relates to an electrode (1) and the manufacturing method thereof, the electrode (1) comprising a body (10) at least partially covered with a composite coating (11) comprising a polypyrrole polymer (110) or the derivatives thereofn the polymer (110) comprising monomeric units of pyrrole having a side chain comprising at least one carboxylate group, particles (111) of metal oxide based on at least one metal, the quantity of at least one metal of the metal oxide being less than or equal to 7 mmol.cm-3 per carboxylate group of the monomeric units of pyrrole. The elecrode (1) is an improved electrode in particular in terms of sustainability and cost, and continues to produce a suitable standard of electrocatalytic activity.L'invention concerne une électrode (1) et son procédé de fabrication, l'électrode (1) comprenant un corps (10) recouvert au moins en partie par un revêtement (11) composite comprenant un polymère (110) polypyrrole ou ses dérivés, le polymère (110) comprenant des unités monomères pyrroles présentant une chaîne latérale comprenant au moins un groupement carboxylate, des particules (111) d'oxyde métallique à base d'au moins un métal, la quantité de l'au moins un métal de l'oxyde métallique étant inférieure ou égale à 7 mmol.cm-3 par groupement carboxylate des unités monomères pyrroles. L'électrode (1) est améliorée notamment en termes de ressources, d'environnement et de coût, tout en conservant une activité électrocatalytique satisfaisante

Turnover Number in Photoinduced Molecular Catalysis of Hydrogen Evolution: a Benchmarking for Catalysts?

International audienceDevelopment of devices for production of H2 using light and a sustainable source of electrons may require the design of molecular systems combining a molecular catalyst and a photosensitizer. Evaluation of the efficiency of hydrogen production is commonly performed in homogeneous solution with a sacrificial electron donor and the report of the maximal turnover number vs catalyst. This figure of merit is strongly dependent on deactivation pathways and does not by itself provide a benchmarking for catalysts. In particular, when the photosensitizer degradation is the primary source of limitation, a kinetic model, rationalizing literature data, shows that a decrease of the catalyst concentration leads to an increase of TON Cat lim. It indicates that exceptionally high TON Cat lim obtained at very low catalyst concentration shall not be considered as an indication of an exceptional catalytic system. We advocate for a systematic kinetic analysis in order to get a quantitative measure of the competitive pathways leading to TON Cat lim values and to provide keys for performance improvement