Water photolysis with a cross-linked titanium dioxide nanowire anode

Mingzhao Liu, Nathalie De Leon Snapp, Hongkun Park

Research output: Contribution to journalArticle

94 Scopus citations

Abstract

We report efficient water photolysis using a cross-linked TiO2 nanowire anode containing mixed anatase and rutile phases. Under simulated AM 1.5 G illumination, the peak solar energy conversion efficiency is measured to be 1.05%, a new record for TiO2 photoanodes. A photocurrent density as high as 2.6 mA cm_2 is observed when the film thickness is 22 mm. These observations indicate that the high surface area architecture afforded by the cross-linked TiO2 nanowires enables both long optical path lengths and high photon-to-electron conversion efficiency. We also report photocurrent in the visible range due to sub-band gap absorptions, which is enhanced by up to a factor of 10 when the TiO2 nanowires are coated with gold or silver nanoparticles. This enhancement is observed only in thinner (up to 1 mm) TiO2 nanowire films, however, indicating that the effect stems from enhanced light retention by nanoparticle scattering

Original languageEnglish (US)
Pages (from-to)80-87
Number of pages8
JournalChemical Science
Volume2
Issue number1
DOIs
StatePublished - May 9 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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