Highly stable photoelectrochemical water splitting and hydrogen generation using a double-band InGaN/GaN core/shell nanowire photoanode

B. Alotaibi, H. P.T. Nguyen, S. Zhao, M. G. Kibria, S. Fan, Z. Mi

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

Abstract

We report on the first demonstration of stable photoelectrochemical water splitting and hydrogen generation on a double-band photoanode in acidic solution (hydrogen bromide), which is achieved by InGaN/GaN core/shell nanowire arrays grown on Si substrate using catalyst-free molecular beam epitaxy. The nanowires are doped n-type using Si to reduce the surface depletion region and increase current conduction. Relatively high incident-photon-to-current-conversion efficiency (up to ∼27%) is measured under ultraviolet and visible light irradiation. Under simulated sunlight illumination, steady evolution of molecular hydrogen is further demonstrated.

Original languageEnglish (US)
Pages (from-to)4356-4361
Number of pages6
JournalNano Letters
Volume13
Issue number9
DOIs
StatePublished - Sep 11 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

  • InGaN
  • Nanowire
  • hydrogen
  • photoelectrochemical water splitting
  • solar fuels

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