Photoelectrochemical enhancement from deposition of BiVO 4 photosensitizer on different thickness layer TiO 2 photoanode for water splitting application

Ahmad Afif Safwan Mohd Radzi, Javad Safaei, Mohd Asri Mat Teridi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

TiO 2 is a prominent photocatalyst and has been pioneering the research in water splitting for hydrogen cell production. However, TiO 2 has low visible region absorption which limit its functionality as a photoabsorber and requires addition of other high absorptive material such as BiVO 4 . Fabrication of TiO 2 photoanode on FTO substrate and deposition of BiVO 4 on TiO 2 were done using simple spin coating procedure. TiO 2 /BiVO 4 photoelectrode were first tested for its photo absorption, photocurrent generation and electrical impedance to obtain the optimized sample. Optimized sample then further tested for its photocurrent generation stability using linear sweep voltammetry and time dependent photocurrent test. Photo absorption enhancement from TiO 2 /BiVO 4 of almost 10 folds achieved along the visible region comparing to pure TiO 2 . Photogenerated charge produced from TiO 2 /BiVO 4 is also 3 folds higher compared to pure TiO 2 at water oxidation threshold potential at 1.23 V vs. RHE. From photocurrent generation analysis, heterostructure of TiO 2 /BiVO 4 proven to produce more than 3 folds higher photocurrent comparing to both pure TiO 2 and BiVO 4 .

Original languageEnglish
Article number100274
JournalNano-Structures and Nano-Objects
Volume18
DOIs
Publication statusPublished - 1 Apr 2019

Fingerprint

water splitting
Photosensitizing Agents
Photosensitizers
Photocurrents
photocurrents
Water
augmentation
photoabsorption
Acoustic impedance
Spin coating
Voltammetry
Photocatalysts
electrical impedance
coating
Heterojunctions
Hydrogen
impedance
Fabrication
Oxidation
oxidation

Keywords

  • Bismuth vanadate
  • Photoelectrochemical water splitting
  • Thin-film
  • Titanium dioxide
  • Z-scheme

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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abstract = "TiO 2 is a prominent photocatalyst and has been pioneering the research in water splitting for hydrogen cell production. However, TiO 2 has low visible region absorption which limit its functionality as a photoabsorber and requires addition of other high absorptive material such as BiVO 4 . Fabrication of TiO 2 photoanode on FTO substrate and deposition of BiVO 4 on TiO 2 were done using simple spin coating procedure. TiO 2 /BiVO 4 photoelectrode were first tested for its photo absorption, photocurrent generation and electrical impedance to obtain the optimized sample. Optimized sample then further tested for its photocurrent generation stability using linear sweep voltammetry and time dependent photocurrent test. Photo absorption enhancement from TiO 2 /BiVO 4 of almost 10 folds achieved along the visible region comparing to pure TiO 2 . Photogenerated charge produced from TiO 2 /BiVO 4 is also 3 folds higher compared to pure TiO 2 at water oxidation threshold potential at 1.23 V vs. RHE. From photocurrent generation analysis, heterostructure of TiO 2 /BiVO 4 proven to produce more than 3 folds higher photocurrent comparing to both pure TiO 2 and BiVO 4 .",
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AU - Radzi, Ahmad Afif Safwan Mohd

AU - Safaei, Javad

AU - Mat Teridi, Mohd Asri

PY - 2019/4/1

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N2 - TiO 2 is a prominent photocatalyst and has been pioneering the research in water splitting for hydrogen cell production. However, TiO 2 has low visible region absorption which limit its functionality as a photoabsorber and requires addition of other high absorptive material such as BiVO 4 . Fabrication of TiO 2 photoanode on FTO substrate and deposition of BiVO 4 on TiO 2 were done using simple spin coating procedure. TiO 2 /BiVO 4 photoelectrode were first tested for its photo absorption, photocurrent generation and electrical impedance to obtain the optimized sample. Optimized sample then further tested for its photocurrent generation stability using linear sweep voltammetry and time dependent photocurrent test. Photo absorption enhancement from TiO 2 /BiVO 4 of almost 10 folds achieved along the visible region comparing to pure TiO 2 . Photogenerated charge produced from TiO 2 /BiVO 4 is also 3 folds higher compared to pure TiO 2 at water oxidation threshold potential at 1.23 V vs. RHE. From photocurrent generation analysis, heterostructure of TiO 2 /BiVO 4 proven to produce more than 3 folds higher photocurrent comparing to both pure TiO 2 and BiVO 4 .

AB - TiO 2 is a prominent photocatalyst and has been pioneering the research in water splitting for hydrogen cell production. However, TiO 2 has low visible region absorption which limit its functionality as a photoabsorber and requires addition of other high absorptive material such as BiVO 4 . Fabrication of TiO 2 photoanode on FTO substrate and deposition of BiVO 4 on TiO 2 were done using simple spin coating procedure. TiO 2 /BiVO 4 photoelectrode were first tested for its photo absorption, photocurrent generation and electrical impedance to obtain the optimized sample. Optimized sample then further tested for its photocurrent generation stability using linear sweep voltammetry and time dependent photocurrent test. Photo absorption enhancement from TiO 2 /BiVO 4 of almost 10 folds achieved along the visible region comparing to pure TiO 2 . Photogenerated charge produced from TiO 2 /BiVO 4 is also 3 folds higher compared to pure TiO 2 at water oxidation threshold potential at 1.23 V vs. RHE. From photocurrent generation analysis, heterostructure of TiO 2 /BiVO 4 proven to produce more than 3 folds higher photocurrent comparing to both pure TiO 2 and BiVO 4 .

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KW - Titanium dioxide

KW - Z-scheme

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