Growth of BiVO 4 nanoparticles on a WO 3 porous scaffold: Improved water-splitting by high band-edge light harvesting

Kiwon Kim, Seong Kyung Nam, Jong Hyeok Park, Jun Hyuk Moon

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The BiVO 4 /WO 3 heterojunction is the ideal photoanode for highly efficient solar water splitting. Despite much effort, the low light absorption efficiency near the BiVO 4 band gap wavelength is still a major cause of loss of water-splitting efficiency. To address this issue, we introduce a BiVO 4 /WO 3 photoanode in which BiVO 4 single crystal nanoparticles (NPs) are decorated. In particular, we present a limited growth method in confined geometry to synthesize BiVO 4 NPs. These BiVO 4 NPs enhance Rayleigh-type light scattering, especially at the absorption edge wavelengths, resulting in increased light absorption efficiency (η abs ) at the corresponding wavelengths; the BiVO 4 NPs dramatically improved the η abs up to 60% at 500 nm, which is more than twice as high as the η abs values obtained for previously reported BiVO 4 photoanodes. In addition, BiVO 4 NPs exhibit high charge separation efficiency, especially at low bias potentials. This result indicates effective charge transport in the NP morphology. As a result, the BiVO 4 NP-coated WO 3 photoanode achieves a remarkably high water splitting photocurrent of 5.8 ± 0.18 mA cm -2 . This is the highest water-splitting photocurrent among those previously reported for BiVO 4 -based photoanodes.

Original languageEnglish
Pages (from-to)4480-4485
Number of pages6
JournalJournal of Materials Chemistry A
Volume7
Issue number9
DOIs
Publication statusPublished - 2019 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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