Highly Efficient Water Oxidation Photoanode Made of Surface Modified LaTiO2N Particles

Seiji Akiyama; Mamiko Nakabayashi; Naoya Shibata; Tsutomu Minegishi; Yusuke Asakura; Md Abdulla-Al-Mamun; Takashi Hisatomi; Hiroshi Nishiyama; Masao Katayama; Taro Yamada; Kazunari Domen

doi:10.1002/smll.201601929

Highly Efficient Water Oxidation Photoanode Made of Surface Modified LaTiO₂N Particles

Seiji Akiyama, Mamiko Nakabayashi, Naoya Shibata, Tsutomu Minegishi, Yusuke Asakura, Md Abdulla-Al-Mamun, Takashi Hisatomi, Hiroshi Nishiyama, Masao Katayama, Taro Yamada, Kazunari Domen^*

^*Corresponding author for this work

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

35 Citations (Scopus)

Abstract

An improved variation of highly active/durable O₂-evolving LaTiO₂N powder-based photoelectrode has been fabricated by pre-cleaning the powder with mild polysulfonic acid and by homogeneous deposition of CoO_x co-catalyst aided by microwave annealing. The treatment in aqueous solution of poly(4-styrene sulfonic acid) results in removal of surface LaTiO₂N layers, forming fine pores in the crystallites. The CoO_x co-catalyst by microwave deposition in Co(NH₃)₆Cl₃/ethylene glycol homogeneously covers the particle surface. The LaTiO₂N powder is fabricated into particle-transferred electrodes on Ti thin film supported on solid substrate. The modified LaTiO₂N grains on the electrode serve as a highly active O₂-evolving photoanode achieving 8.9 mA cm⁻² of the photocurrent density at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 m NaOH (pH 13) under solar-simulator irradiation Airmass 1.5 Global (AM 1.5G). The activity has been much improved, compared with conventional LaTiO₂N treated in mineral acid or with CoO_x deposited by impregnation. The new electrode also exhibits better durability in fixed-potential chronoamperometric tests under AM 1.5G irradiation.

Original language	English
Pages (from-to)	5468-5476
Number of pages	9
Journal	Small
Volume	12
Issue number	39
DOIs	https://doi.org/10.1002/smll.201601929
Publication status	Published - 2016 Oct 19
Externally published	Yes

Keywords

microwave assisted deposition
photoelectrochemical water splitting
photoelectrodes
poly(4-styrenesulfonic acid)
surface reforming

ASJC Scopus subject areas

Biotechnology
Biomaterials
Chemistry(all)
Materials Science(all)

UN SDGs

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

Access to Document

10.1002/smll.201601929

Cite this

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title = "Highly Efficient Water Oxidation Photoanode Made of Surface Modified LaTiO2N Particles",

abstract = "An improved variation of highly active/durable O2-evolving LaTiO2N powder-based photoelectrode has been fabricated by pre-cleaning the powder with mild polysulfonic acid and by homogeneous deposition of CoOx co-catalyst aided by microwave annealing. The treatment in aqueous solution of poly(4-styrene sulfonic acid) results in removal of surface LaTiO2N layers, forming fine pores in the crystallites. The CoOx co-catalyst by microwave deposition in Co(NH3)6Cl3/ethylene glycol homogeneously covers the particle surface. The LaTiO2N powder is fabricated into particle-transferred electrodes on Ti thin film supported on solid substrate. The modified LaTiO2N grains on the electrode serve as a highly active O2-evolving photoanode achieving 8.9 mA cm−2 of the photocurrent density at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 m NaOH (pH 13) under solar-simulator irradiation Airmass 1.5 Global (AM 1.5G). The activity has been much improved, compared with conventional LaTiO2N treated in mineral acid or with CoOx deposited by impregnation. The new electrode also exhibits better durability in fixed-potential chronoamperometric tests under AM 1.5G irradiation.",

keywords = "microwave assisted deposition, photoelectrochemical water splitting, photoelectrodes, poly(4-styrenesulfonic acid), surface reforming",

author = "Seiji Akiyama and Mamiko Nakabayashi and Naoya Shibata and Tsutomu Minegishi and Yusuke Asakura and Md Abdulla-Al-Mamun and Takashi Hisatomi and Hiroshi Nishiyama and Masao Katayama and Taro Yamada and Kazunari Domen",

note = "Publisher Copyright: {\textcopyright} 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2016",

month = oct,

day = "19",

doi = "10.1002/smll.201601929",

language = "English",

volume = "12",

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journal = "Small",

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T1 - Highly Efficient Water Oxidation Photoanode Made of Surface Modified LaTiO2N Particles

AU - Akiyama, Seiji

AU - Nakabayashi, Mamiko

AU - Shibata, Naoya

AU - Minegishi, Tsutomu

AU - Asakura, Yusuke

AU - Abdulla-Al-Mamun, Md

AU - Hisatomi, Takashi

AU - Nishiyama, Hiroshi

AU - Katayama, Masao

AU - Yamada, Taro

AU - Domen, Kazunari

PY - 2016/10/19

Y1 - 2016/10/19

N2 - An improved variation of highly active/durable O2-evolving LaTiO2N powder-based photoelectrode has been fabricated by pre-cleaning the powder with mild polysulfonic acid and by homogeneous deposition of CoOx co-catalyst aided by microwave annealing. The treatment in aqueous solution of poly(4-styrene sulfonic acid) results in removal of surface LaTiO2N layers, forming fine pores in the crystallites. The CoOx co-catalyst by microwave deposition in Co(NH3)6Cl3/ethylene glycol homogeneously covers the particle surface. The LaTiO2N powder is fabricated into particle-transferred electrodes on Ti thin film supported on solid substrate. The modified LaTiO2N grains on the electrode serve as a highly active O2-evolving photoanode achieving 8.9 mA cm−2 of the photocurrent density at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 m NaOH (pH 13) under solar-simulator irradiation Airmass 1.5 Global (AM 1.5G). The activity has been much improved, compared with conventional LaTiO2N treated in mineral acid or with CoOx deposited by impregnation. The new electrode also exhibits better durability in fixed-potential chronoamperometric tests under AM 1.5G irradiation.

AB - An improved variation of highly active/durable O2-evolving LaTiO2N powder-based photoelectrode has been fabricated by pre-cleaning the powder with mild polysulfonic acid and by homogeneous deposition of CoOx co-catalyst aided by microwave annealing. The treatment in aqueous solution of poly(4-styrene sulfonic acid) results in removal of surface LaTiO2N layers, forming fine pores in the crystallites. The CoOx co-catalyst by microwave deposition in Co(NH3)6Cl3/ethylene glycol homogeneously covers the particle surface. The LaTiO2N powder is fabricated into particle-transferred electrodes on Ti thin film supported on solid substrate. The modified LaTiO2N grains on the electrode serve as a highly active O2-evolving photoanode achieving 8.9 mA cm−2 of the photocurrent density at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 m NaOH (pH 13) under solar-simulator irradiation Airmass 1.5 Global (AM 1.5G). The activity has been much improved, compared with conventional LaTiO2N treated in mineral acid or with CoOx deposited by impregnation. The new electrode also exhibits better durability in fixed-potential chronoamperometric tests under AM 1.5G irradiation.

KW - microwave assisted deposition

KW - photoelectrochemical water splitting

KW - photoelectrodes

KW - poly(4-styrenesulfonic acid)

KW - surface reforming

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