Faradaic efficiency of O-2 evolution on metal nanoparticle sensitized hematite photoanodes
Artikel i vetenskaplig tidskrift, 2014

Functionalization of transition metal oxides using metallic nanoparticles is an interesting route towards efficient photoelectrochemical hydrogen production via water splitting. Although an enhanced photocurrent in photoanodes upon functionalization with metallic nanostructures has been observed in several studies, to the best of our knowledge no measurements of the Faradaic efficiency (FE) of the oxygen evolution reaction (OER) have been reported for such systems. This work characterizes the FE on a model system consisting of ultra-thin films of hematite (Fe2O3) sensitized with Ti/Au nanodisks. Compared to bare hematite references, sensitized samples showed significantly enhanced photocurrents as well as O-2 evolution. Experimental evidence suggests that the observed enhancement was not due to photocatalytic activity of the nanodisks. The FE has been determined to be 100%, within the experimental errors, for both sensitized and reference samples. Also, this work demonstrates that the sensitized samples were stable for at least 16 hours photocurrent testing. The concepts shown in this work are generally applicable to any situation in which a semiconductor has its water splitting performance enhanced by metallic nanostructures.

WATER OXIDATION

SOLAR

CATALYST

ATOMIC LAYER DEPOSITION

SEMICONDUCTOR ELECTRODES

PHOTOELECTRODES

IRON-OXIDE

HYDROGEN-PRODUCTION

FILMS

ABSORPTION

Författare

Beniamino Iandolo

Chalmers, Teknisk fysik, Kemisk fysik

Björn Wickman

Chalmers, Teknisk fysik, Kemisk fysik

B. Seger

Danmarks Tekniske Universitet (DTU)

I. Chorkendorff

Danmarks Tekniske Universitet (DTU)

Igor Zoric

Chalmers, Teknisk fysik, Kemisk fysik

Anders Hellman

Chalmers, Teknisk fysik, Kemisk fysik

Physical Chemistry Chemical Physics

1463-9076 (ISSN) 1463-9084 (eISSN)

Vol. 16 3 1271-1275

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Fysik

Kemi

Infrastruktur

Nanotekniklaboratoriet

DOI

10.1039/c3cp54288b