Electrosprayed heterojunction WO<inf>3</inf>/BiVO<inf>4</inf> films with nanotextured pillar structure for enhanced photoelectrochemical water splitting

Mukund G. Mali, Hyun Yoon, Min Woo Kim, Mark T. Swihart, Salem S. Al-Deyab, Suk Goo Yoon

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We demonstrate that the addition of a tungsten oxide (WO<inf>3</inf>) layer beneath a bismuth vanadate (BiVO<inf>4</inf>) photocatalyst layer with a nanotextured pillar morphology significantly increases the photocurrent density in photoelectrochemical water splitting. The WO<inf>3</inf>-BiVO<inf>4</inf> bilayer films produced a photocurrent of up to 3.3 mA/cm<sup>2</sup> under illumination at 100 mW/cm<sup>2</sup> (AM1.5 spectrum). The bilayer film was characterized by scanning electron microscopy, X-ray diffraction, and photoelectrochemical methods, which confirmed the superiority of the bilayer film in terms of its morphology and charge separation and transport ability. Both WO<inf>3</inf> and BiVO<inf>4</inf> were deposited by electrostatic spraying under open-air conditions, which resulted in nanotextured pillars of BiVO<inf>4</inf> atop a smooth WO<inf>3</inf> film. The optimal coating conditions are also reported.

Original languageEnglish
Article number151603
JournalApplied Physics Letters
Volume106
Issue number15
DOIs
Publication statusPublished - 2015 Apr 13

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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