Photolyse de l'eau et production d'hydrogène et d'oxygène au moyen de l'énergie solaire

• Unité de recherche: OFEN
• Numéro de projet: 101789

Mots-clé (Allemand)

TP0066;F - Wasserstoff

Description succincte (Allemand)

The overall solar to chemical energy conversion efficiency of photocatalytic water-splitting via tandem cell hinges on the relatively low current output of the photoanaode (Fe2O3). Therefore its performance has to be ameliorated by silicone doping. The goal is to reach 3 mA/cm2 from currently 1.45 mA/cm2 in AM1.5. Also, design of novel sensitizers containing an extended-system donor on 4,4'-, and an ex-tended-system acceptor anchoring groups on the 4'',4'''quaterpyridine will be scrutinized to improve the efficiency of the solar cell. The feasibility in an alternative tandem configuration where the dye sensitized TiO2 film would be placed on top of the Fe2O3 photoanode will be pursued.

Publications / Résultats (Anglais)

• A new method for deposition of nanocrystalline Fe2O3 photoanode films from Fe (CO)5 and tetraethoxysilane on SnO2 is developed, and the novel Fe2O3 photoanode films oxidize water under visible light with unprecedented efficiency; IPCE = 42% at 370 nm and 2.2 mA/cm2 (corrected by a spectral mismatch factor of 0.82) in AM 1.5 G sunlight of 1000 W/m2 at 1.23 VRHE. • Another important discovery is the deposition of monolayer of cobalt on the hematite surface, which catalyzes the water oxidation and improves solar photocurrents by more than 15%. • We have designed and developed novel unsymmetrical zinc phthalocyanine sensitizers carrying tert-butyl and carboxylic acid groups that act as electron “pushing” and “pulling”entities, respectively, yielded 85% IPCE in the near IR, and 3.56% power conversion efficiency under one sun from selective harvesting of near IR light.

Auftragnehmer/Contractant/Contraente/Contractor:


Autorschaft/Auteurs/Autori/Authors:
Grätzel,Michael

Documents annexés

• Generation of Hydrogen by Water Splitting with Visible Light [PDF] 764 kB