Photoelectrochemical Water Oxidation Using Cobalt Phosphate-Modified Nitrogen-Doped Titania Nanotube Arrays

Unseock Kang; Ryusuke Mizuochi; Hyunwoong Park; Kazuhiko Maeda

doi:10.1002/sstr.202200229

Photoelectrochemical Water Oxidation Using Cobalt Phosphate-Modified Nitrogen-Doped Titania Nanotube Arrays

Unseock Kang, Ryusuke Mizuochi, Hyunwoong Park, Kazuhiko Maeda

School of Energy Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The synthesis of cobalt phosphate (CoPi)-modified, nitrogen-doped TiO₂ nanotube arrays (N-TNAs) for photoelectrochemical (PEC) oxygen evolution under visible light is reported. Because of the nitrogen doping, the N-TNAs exhibit enhanced visible-light activity toward the PEC water oxidation reaction. However, the performance is diminished as a result of self-oxidation by photogenerated holes in the valence band of the N-TNAs. Compared with the N-TNAs, the CoPi/N-TNAs prepared under optimal conditions show a twofold improvement in photocurrent generation and are also sensitive to light with wavelengths as long as 580 nm. Stable oxygen evolution with a Faradaic efficiency approaching unity is demonstrated using the CoPi/N-TNA photoanodes under simulated sunlight for at least 2 h of operation.

Original language	English
Article number	2200229
Journal	Small Structures
Volume	4
Issue number	6
DOIs	https://doi.org/10.1002/sstr.202200229
State	Published - Jun 2023

Keywords

artificial photosynthesis
hydrogen production
mixed-anion compounds
solar fuels
water splitting

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/sstr.202200229

Cite this

@article{90755ae7f588475380a88240c1891bd4,

title = "Photoelectrochemical Water Oxidation Using Cobalt Phosphate-Modified Nitrogen-Doped Titania Nanotube Arrays",

abstract = "The synthesis of cobalt phosphate (CoPi)-modified, nitrogen-doped TiO2 nanotube arrays (N-TNAs) for photoelectrochemical (PEC) oxygen evolution under visible light is reported. Because of the nitrogen doping, the N-TNAs exhibit enhanced visible-light activity toward the PEC water oxidation reaction. However, the performance is diminished as a result of self-oxidation by photogenerated holes in the valence band of the N-TNAs. Compared with the N-TNAs, the CoPi/N-TNAs prepared under optimal conditions show a twofold improvement in photocurrent generation and are also sensitive to light with wavelengths as long as 580 nm. Stable oxygen evolution with a Faradaic efficiency approaching unity is demonstrated using the CoPi/N-TNA photoanodes under simulated sunlight for at least 2 h of operation.",

keywords = "artificial photosynthesis, hydrogen production, mixed-anion compounds, solar fuels, water splitting",

author = "Unseock Kang and Ryusuke Mizuochi and Hyunwoong Park and Kazuhiko Maeda",

note = "Publisher Copyright: {\textcopyright} 2022 The Authors. Small Structures published by Wiley-VCH GmbH.",

year = "2023",

month = jun,

doi = "10.1002/sstr.202200229",

language = "English",

volume = "4",

journal = "Small Structures",

issn = "2688-4062",

publisher = "Wiley-VCH Verlag",

number = "6",

}

TY - JOUR

T1 - Photoelectrochemical Water Oxidation Using Cobalt Phosphate-Modified Nitrogen-Doped Titania Nanotube Arrays

AU - Kang, Unseock

AU - Mizuochi, Ryusuke

AU - Park, Hyunwoong

AU - Maeda, Kazuhiko

PY - 2023/6

Y1 - 2023/6

N2 - The synthesis of cobalt phosphate (CoPi)-modified, nitrogen-doped TiO2 nanotube arrays (N-TNAs) for photoelectrochemical (PEC) oxygen evolution under visible light is reported. Because of the nitrogen doping, the N-TNAs exhibit enhanced visible-light activity toward the PEC water oxidation reaction. However, the performance is diminished as a result of self-oxidation by photogenerated holes in the valence band of the N-TNAs. Compared with the N-TNAs, the CoPi/N-TNAs prepared under optimal conditions show a twofold improvement in photocurrent generation and are also sensitive to light with wavelengths as long as 580 nm. Stable oxygen evolution with a Faradaic efficiency approaching unity is demonstrated using the CoPi/N-TNA photoanodes under simulated sunlight for at least 2 h of operation.

AB - The synthesis of cobalt phosphate (CoPi)-modified, nitrogen-doped TiO2 nanotube arrays (N-TNAs) for photoelectrochemical (PEC) oxygen evolution under visible light is reported. Because of the nitrogen doping, the N-TNAs exhibit enhanced visible-light activity toward the PEC water oxidation reaction. However, the performance is diminished as a result of self-oxidation by photogenerated holes in the valence band of the N-TNAs. Compared with the N-TNAs, the CoPi/N-TNAs prepared under optimal conditions show a twofold improvement in photocurrent generation and are also sensitive to light with wavelengths as long as 580 nm. Stable oxygen evolution with a Faradaic efficiency approaching unity is demonstrated using the CoPi/N-TNA photoanodes under simulated sunlight for at least 2 h of operation.

KW - artificial photosynthesis

KW - hydrogen production

KW - mixed-anion compounds

KW - solar fuels

KW - water splitting

UR - http://www.scopus.com/inward/record.url?scp=85175971052&partnerID=8YFLogxK

U2 - 10.1002/sstr.202200229

DO - 10.1002/sstr.202200229

M3 - Article

AN - SCOPUS:85175971052

SN - 2688-4062

VL - 4

JO - Small Structures

JF - Small Structures

IS - 6

M1 - 2200229

ER -

Photoelectrochemical Water Oxidation Using Cobalt Phosphate-Modified Nitrogen-Doped Titania Nanotube Arrays

Abstract

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this