Electrosprayed MnO2 on ZnO nanorods with atomic layer deposited TiO2 layer for photoelectrocatalytic water splitting

Min Woo Kim, Bhavana Joshi, Edmund Samuel, Hyunjun Seok, Ali Aldalbahi, Mohammed Almoiqli, Mark T. Swihart, Sam S. Yoon

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We have designed and produced a hierarchical photocatalyst for water splitting by first fabricating ZnO nanorods via a chemical bath deposition (CBD) process using ZnO seeds electrosprayed onto In-doped tin oxide (ITO), then electrospraying MnO2 particles as a co-catalyst, and finally depositing an ultrathin passivation layer of TiO2 via atomic layer deposition. These hierarchical photocatalysts exhibit excellent photoelectrochemical properties and reduced photocorrosion compared to materials without TiO2 coating. Moreover, the MnO2-garnished ZnO nanorods obtained at 550 °C deliver a 1.7-fold enhancement in photocurrent density (0.95 mA/cm2) at 1.2 VAg/AgCl in 0.5-M Na2SO3 solution compared to ZnO nanorods without MnO2. We attribute improved photocurrent density to rapid charge transfer and charge separation at the ZnO–MnO2 interface. This investigation illustrates a balanced design of a nanoarchitecture for photoelectrodes that favors formation of effective photoelectrocatalytic sites while improving stability for potential large-scale water splitting applications.

Original languageEnglish
Article number118928
JournalApplied Catalysis B: Environmental
Volume271
DOIs
Publication statusPublished - 2020 Aug 15

Keywords

  • Electrostatic spray
  • Photocatalyst
  • Ultrathin TiO
  • Water splitting
  • ZnO nanorods

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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