Hierarchal Nanorod-Derived Bilayer Strategy to Enhance the Photocurrent Density of Sb2Se3 Photocathodes for Photoelectrochemical Water Splitting

Jaemin Park, Wooseok Yang, Jeiwan Tan, Hyungsoo Lee, Ju Won Yun, Sang Gi Shim, Young Sun Park, Jooho Moon

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

For practical H2 production via photoelectrochemical (PEC) water splitting, a proper nanostructure strategy allowing sufficient light absorption and effective charge carrier transport is of immense importance. In this study, via the unique sequential use of two different molecular inks, a bilayer nanostructure for a photocathode composed of vertically oriented nanorods Sb2Se3 on top of a bottom compact Sb2Se3 layer is produced. The hierarchical nanorod bilayer structure possesses light-trapping ability owing to the scattering effect, resulting in the enhancement of light absorption. The bilayer Sb2Se3 photocathode also exhibits better charge-transport capability owing to the synergetic effects of the favorable crystallographic orientation and the enlarged surface area of the vertically aligned nanorods. The bilayer Sb2Se3 photocathode achieves a photocurrent density of nearly 30 mA cm-2 at 0 V vs the reversible hydrogen electrode. This observation implies that the proposed solution-processed Sb2Se3-based hierarchical bilayer structure is a promising candidate for an efficient PEC water splitting tandem device.

Original languageEnglish
Pages (from-to)136-145
Number of pages10
JournalACS Energy Letters
Volume5
Issue number1
DOIs
Publication statusPublished - 2020 Jan 10

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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