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

34 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

Fingerprint

water splitting
heterojunctions
photocurrents
tungsten oxides
vanadates
spraying
polarization (charge separation)
bismuth
illumination
electrostatics
coatings
scanning electron microscopy
diffraction
x rays

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Electrosprayed heterojunction WO<inf>3</inf>/BiVO<inf>4</inf> films with nanotextured pillar structure for enhanced photoelectrochemical water splitting. / Mali, Mukund G.; Yoon, Hyun; Kim, Min Woo; Swihart, Mark T.; Al-Deyab, Salem S.; Yoon, Suk Goo.

In: Applied Physics Letters, Vol. 106, No. 15, 151603, 13.04.2015.

Research output: Contribution to journalArticle

@article{78f5ffdeb5124957ab9aa89e0bf786e3,
title = "Electrosprayed heterojunction WO3/BiVO4 films with nanotextured pillar structure for enhanced photoelectrochemical water splitting",
abstract = "We demonstrate that the addition of a tungsten oxide (WO3) layer beneath a bismuth vanadate (BiVO4) photocatalyst layer with a nanotextured pillar morphology significantly increases the photocurrent density in photoelectrochemical water splitting. The WO3-BiVO4 bilayer films produced a photocurrent of up to 3.3 mA/cm2 under illumination at 100 mW/cm2 (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 WO3 and BiVO4 were deposited by electrostatic spraying under open-air conditions, which resulted in nanotextured pillars of BiVO4 atop a smooth WO3 film. The optimal coating conditions are also reported.",
author = "Mali, {Mukund G.} and Hyun Yoon and Kim, {Min Woo} and Swihart, {Mark T.} and Al-Deyab, {Salem S.} and Yoon, {Suk Goo}",
year = "2015",
month = "4",
day = "13",
doi = "10.1063/1.4918583",
language = "English",
volume = "106",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "15",

}

TY - JOUR

T1 - Electrosprayed heterojunction WO3/BiVO4 films with nanotextured pillar structure for enhanced photoelectrochemical water splitting

AU - Mali, Mukund G.

AU - Yoon, Hyun

AU - Kim, Min Woo

AU - Swihart, Mark T.

AU - Al-Deyab, Salem S.

AU - Yoon, Suk Goo

PY - 2015/4/13

Y1 - 2015/4/13

N2 - We demonstrate that the addition of a tungsten oxide (WO3) layer beneath a bismuth vanadate (BiVO4) photocatalyst layer with a nanotextured pillar morphology significantly increases the photocurrent density in photoelectrochemical water splitting. The WO3-BiVO4 bilayer films produced a photocurrent of up to 3.3 mA/cm2 under illumination at 100 mW/cm2 (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 WO3 and BiVO4 were deposited by electrostatic spraying under open-air conditions, which resulted in nanotextured pillars of BiVO4 atop a smooth WO3 film. The optimal coating conditions are also reported.

AB - We demonstrate that the addition of a tungsten oxide (WO3) layer beneath a bismuth vanadate (BiVO4) photocatalyst layer with a nanotextured pillar morphology significantly increases the photocurrent density in photoelectrochemical water splitting. The WO3-BiVO4 bilayer films produced a photocurrent of up to 3.3 mA/cm2 under illumination at 100 mW/cm2 (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 WO3 and BiVO4 were deposited by electrostatic spraying under open-air conditions, which resulted in nanotextured pillars of BiVO4 atop a smooth WO3 film. The optimal coating conditions are also reported.

UR - http://www.scopus.com/inward/record.url?scp=84928501368&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84928501368&partnerID=8YFLogxK

U2 - 10.1063/1.4918583

DO - 10.1063/1.4918583

M3 - Article

VL - 106

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 15

M1 - 151603

ER -