Enhanced photoelectrochemical water splitting of micro-arc oxidized TiO2 via anatase/rutile phase control and nitrogen doping

Sung Ran Woo, Yun Mo Sung

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Titania and nitrogen-doped titania (TiO2) films were successfully prepared via micro-arc oxidation (MAO) of pure Ti plates. The films showed micro-porosity and high crystallinity with ∼10–20 nm nanocrystals of anatase or anatase/rutile. Through the variation of applied voltage and time for MAO processing the phase composition ratio of rutile-to-anatase could be controlled from 5:95 to 19:81. Nitrogen doping into titania was conducted by adding acetamide in an NaOH electrolyte solution during MAO and the nitrogen concentration was determined to be ∼1 ± 0.23% by X-ray photoelectron spectroscopy. UV/visible spectroscopy revealed the apparent redshift in nitrogen-doped samples, which evidences the nitrogen doping in TiO2 lattices. Also, both pure and nitrogen-doped samples showed the gradual redshift according to rutile content. Nitrogen-doped 81% anatase-19% rutile samples showed the highest photocurrent density and photoconversion efficiency of 0.594 mA/cm2 and 0.6685%, respectively at 0 voltage, while pure and 100% anatase TiO2 samples showed the lowest ones of 0.036 mA/cm2 and 0.0327%, respectively at 0 voltage. Photocurrent density could be further increased up to 0.8 mA/cm2 using a mixed electrolyte of NaOH and KI.

Original languageEnglish
Pages (from-to)H278-H285
JournalJournal of the Electrochemical Society
Volume163
Issue number5
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

Phase control
water splitting
phase control
anatase
rutile
Titanium dioxide
Nitrogen
arcs
Doping (additives)
nitrogen
Water
Titanium
Photocurrents
Oxidation
oxidation
photocurrents
Electric potential
electric potential
titanium
Electrolytes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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title = "Enhanced photoelectrochemical water splitting of micro-arc oxidized TiO2 via anatase/rutile phase control and nitrogen doping",
abstract = "Titania and nitrogen-doped titania (TiO2) films were successfully prepared via micro-arc oxidation (MAO) of pure Ti plates. The films showed micro-porosity and high crystallinity with ∼10–20 nm nanocrystals of anatase or anatase/rutile. Through the variation of applied voltage and time for MAO processing the phase composition ratio of rutile-to-anatase could be controlled from 5:95 to 19:81. Nitrogen doping into titania was conducted by adding acetamide in an NaOH electrolyte solution during MAO and the nitrogen concentration was determined to be ∼1 ± 0.23{\%} by X-ray photoelectron spectroscopy. UV/visible spectroscopy revealed the apparent redshift in nitrogen-doped samples, which evidences the nitrogen doping in TiO2 lattices. Also, both pure and nitrogen-doped samples showed the gradual redshift according to rutile content. Nitrogen-doped 81{\%} anatase-19{\%} rutile samples showed the highest photocurrent density and photoconversion efficiency of 0.594 mA/cm2 and 0.6685{\%}, respectively at 0 voltage, while pure and 100{\%} anatase TiO2 samples showed the lowest ones of 0.036 mA/cm2 and 0.0327{\%}, respectively at 0 voltage. Photocurrent density could be further increased up to 0.8 mA/cm2 using a mixed electrolyte of NaOH and KI.",
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AU - Woo, Sung Ran

AU - Sung, Yun Mo

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N2 - Titania and nitrogen-doped titania (TiO2) films were successfully prepared via micro-arc oxidation (MAO) of pure Ti plates. The films showed micro-porosity and high crystallinity with ∼10–20 nm nanocrystals of anatase or anatase/rutile. Through the variation of applied voltage and time for MAO processing the phase composition ratio of rutile-to-anatase could be controlled from 5:95 to 19:81. Nitrogen doping into titania was conducted by adding acetamide in an NaOH electrolyte solution during MAO and the nitrogen concentration was determined to be ∼1 ± 0.23% by X-ray photoelectron spectroscopy. UV/visible spectroscopy revealed the apparent redshift in nitrogen-doped samples, which evidences the nitrogen doping in TiO2 lattices. Also, both pure and nitrogen-doped samples showed the gradual redshift according to rutile content. Nitrogen-doped 81% anatase-19% rutile samples showed the highest photocurrent density and photoconversion efficiency of 0.594 mA/cm2 and 0.6685%, respectively at 0 voltage, while pure and 100% anatase TiO2 samples showed the lowest ones of 0.036 mA/cm2 and 0.0327%, respectively at 0 voltage. Photocurrent density could be further increased up to 0.8 mA/cm2 using a mixed electrolyte of NaOH and KI.

AB - Titania and nitrogen-doped titania (TiO2) films were successfully prepared via micro-arc oxidation (MAO) of pure Ti plates. The films showed micro-porosity and high crystallinity with ∼10–20 nm nanocrystals of anatase or anatase/rutile. Through the variation of applied voltage and time for MAO processing the phase composition ratio of rutile-to-anatase could be controlled from 5:95 to 19:81. Nitrogen doping into titania was conducted by adding acetamide in an NaOH electrolyte solution during MAO and the nitrogen concentration was determined to be ∼1 ± 0.23% by X-ray photoelectron spectroscopy. UV/visible spectroscopy revealed the apparent redshift in nitrogen-doped samples, which evidences the nitrogen doping in TiO2 lattices. Also, both pure and nitrogen-doped samples showed the gradual redshift according to rutile content. Nitrogen-doped 81% anatase-19% rutile samples showed the highest photocurrent density and photoconversion efficiency of 0.594 mA/cm2 and 0.6685%, respectively at 0 voltage, while pure and 100% anatase TiO2 samples showed the lowest ones of 0.036 mA/cm2 and 0.0327%, respectively at 0 voltage. Photocurrent density could be further increased up to 0.8 mA/cm2 using a mixed electrolyte of NaOH and KI.

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