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ZnSe nanorods en tant qu'absorbeur de lumière visible pour le dégagement H2 photocatalytique et photoélectrochimique de l'eau.

On présente un système de photocatalyseur sans métaux précieux et sans Cd pour un dégagement efficace de H2 à partir d’eau avec une performance comparable à celle de points quantiques à base de Cd. Les nanocristaux de ZnSe (nanorodes, NR) en forme de bâtonnet avec un co-catalyseur Ni (BF4) 2 en suspension dans de l'acide ascorbique aqueux dégagent H2 avec un maximum de 54 ± 2 mmolH2 gZnSe-1 h-1 sous un éclairage visible (lambda> 400 nm, AM 1,5G, 100 mW cm-2) et rendement quantique 50 ± 4% (lambda = 400 nm). Sous irradiation solaire à spectre complet (AM 1,5G, 100 mW cm-2), on génère jusqu'à 149 ± 22 mmolH2 gZnSe-1 h-1. Une photocorrosion significative n'a pas été observée après 40 h et l'activité a même été observée sans co-catalyseur ajouté. Les NRs de ZnSe peuvent également être utilisés pour construire une photocathode peu coûteuse à base de Delafossite, qui ne repose pas sur un donneur d’électrons sacrificiel. Les ZnSe-NR immobilisés sur CuCrO2 génèrent des photocourants de ~ 10 microA cm-2 dans une solution électrolytique aqueuse (pH 5,5), avec un potentiel de déclenchement du photocourant à ~ + 0,75 V par rapport à RHE. Ce travail établit ZnSe comme un absorbeur de lumière de pointe pour la génération de H2 photocatalytique et photoélectrochimique.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30715778


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