Efficient Water Splitting Cascade Photoanodes with Ligand-Engineered MnO Cocatalysts

Mi Gyoung Lee; Kyoungsuk Jin; Ki Chang Kwon; Woonbae Sohn; Hoonkee Park; Kyoung Soon Choi; Yoo Kyung Go; Hongmin Seo; Jung Sug Hong; Ki Tae Nam; Ho Won Jang

doi:10.1002/advs.201800727

Efficient Water Splitting Cascade Photoanodes with Ligand-Engineered MnO Cocatalysts

Mi Gyoung Lee, Kyoungsuk Jin, Ki Chang Kwon, Woonbae Sohn, Hoonkee Park, Kyoung Soon Choi, Yoo Kyung Go, Hongmin Seo, Jung Sug Hong, Ki Tae Nam, Ho Won Jang

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

29 Citations (Scopus)

Abstract

The band edge positions of semiconductors determine functionality in solar water splitting. While ligand exchange is known to enable modification of the band structure, its crucial role in water splitting efficiency is not yet fully understood. Here, ligand-engineered manganese oxide cocatalyst nanoparticles (MnO NPs) on bismuth vanadate (BiVO₄) anodes are first demonstrated, and a remarkably enhanced photocurrent density of 6.25 mA cm⁻² is achieved. It is close to 85% of the theoretical photocurrent density (≈7.5 mA cm⁻²) of BiVO₄. Improved photoactivity is closely related to the substantial shifts in band edge energies that originate from both the induced dipole at the ligand/MnO interface and the intrinsic dipole of the ligand. Combined spectroscopic analysis and electrochemical study reveal the clear relationship between the surface modification and the band edge positions for water oxidation. The proposed concept has considerable potential to explore new, efficient solar water splitting systems.

Original language	English
Article number	1800727
Journal	Advanced Science
Volume	5
Issue number	10
DOIs	https://doi.org/10.1002/advs.201800727
Publication status	Published - 2018 Oct
Externally published	Yes

Keywords

MnO
band structure
ligand engineering
oxygen evolution catalysts
water splitting

ASJC Scopus subject areas

Medicine (miscellaneous)
Chemical Engineering(all)
Biochemistry, Genetics and Molecular Biology (miscellaneous)
Materials Science(all)
Engineering(all)
Physics and Astronomy(all)

UN SDGs

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

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10.1002/advs.201800727

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title = "Efficient Water Splitting Cascade Photoanodes with Ligand-Engineered MnO Cocatalysts",

abstract = "The band edge positions of semiconductors determine functionality in solar water splitting. While ligand exchange is known to enable modification of the band structure, its crucial role in water splitting efficiency is not yet fully understood. Here, ligand-engineered manganese oxide cocatalyst nanoparticles (MnO NPs) on bismuth vanadate (BiVO4) anodes are first demonstrated, and a remarkably enhanced photocurrent density of 6.25 mA cm−2 is achieved. It is close to 85% of the theoretical photocurrent density (≈7.5 mA cm−2) of BiVO4. Improved photoactivity is closely related to the substantial shifts in band edge energies that originate from both the induced dipole at the ligand/MnO interface and the intrinsic dipole of the ligand. Combined spectroscopic analysis and electrochemical study reveal the clear relationship between the surface modification and the band edge positions for water oxidation. The proposed concept has considerable potential to explore new, efficient solar water splitting systems.",

keywords = "MnO, band structure, ligand engineering, oxygen evolution catalysts, water splitting",

author = "Lee, {Mi Gyoung} and Kyoungsuk Jin and Kwon, {Ki Chang} and Woonbae Sohn and Hoonkee Park and Choi, {Kyoung Soon} and Go, {Yoo Kyung} and Hongmin Seo and Hong, {Jung Sug} and Nam, {Ki Tae} and Jang, {Ho Won}",

note = "Funding Information: M.G.L. and K.J. contributed equally to this work. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (Grant No. 2017R1A2B3009135). M.G.L. acknowledges the Global PhD Fellowship Program through the National Research Foundation of Korea funded by the Ministry of Education (Grant No. 2015H1A2A1034356). Publisher Copyright: {\textcopyright} 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2018",

month = oct,

doi = "10.1002/advs.201800727",

language = "English",

volume = "5",

journal = "Advanced Science",

issn = "2198-3844",

publisher = "Wiley-VCH Verlag",

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T1 - Efficient Water Splitting Cascade Photoanodes with Ligand-Engineered MnO Cocatalysts

AU - Lee, Mi Gyoung

AU - Jin, Kyoungsuk

AU - Kwon, Ki Chang

AU - Sohn, Woonbae

AU - Park, Hoonkee

AU - Choi, Kyoung Soon

AU - Go, Yoo Kyung

AU - Seo, Hongmin

AU - Hong, Jung Sug

AU - Nam, Ki Tae

AU - Jang, Ho Won

N1 - Funding Information: M.G.L. and K.J. contributed equally to this work. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (Grant No. 2017R1A2B3009135). M.G.L. acknowledges the Global PhD Fellowship Program through the National Research Foundation of Korea funded by the Ministry of Education (Grant No. 2015H1A2A1034356). Publisher Copyright: © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2018/10

Y1 - 2018/10

N2 - The band edge positions of semiconductors determine functionality in solar water splitting. While ligand exchange is known to enable modification of the band structure, its crucial role in water splitting efficiency is not yet fully understood. Here, ligand-engineered manganese oxide cocatalyst nanoparticles (MnO NPs) on bismuth vanadate (BiVO4) anodes are first demonstrated, and a remarkably enhanced photocurrent density of 6.25 mA cm−2 is achieved. It is close to 85% of the theoretical photocurrent density (≈7.5 mA cm−2) of BiVO4. Improved photoactivity is closely related to the substantial shifts in band edge energies that originate from both the induced dipole at the ligand/MnO interface and the intrinsic dipole of the ligand. Combined spectroscopic analysis and electrochemical study reveal the clear relationship between the surface modification and the band edge positions for water oxidation. The proposed concept has considerable potential to explore new, efficient solar water splitting systems.

AB - The band edge positions of semiconductors determine functionality in solar water splitting. While ligand exchange is known to enable modification of the band structure, its crucial role in water splitting efficiency is not yet fully understood. Here, ligand-engineered manganese oxide cocatalyst nanoparticles (MnO NPs) on bismuth vanadate (BiVO4) anodes are first demonstrated, and a remarkably enhanced photocurrent density of 6.25 mA cm−2 is achieved. It is close to 85% of the theoretical photocurrent density (≈7.5 mA cm−2) of BiVO4. Improved photoactivity is closely related to the substantial shifts in band edge energies that originate from both the induced dipole at the ligand/MnO interface and the intrinsic dipole of the ligand. Combined spectroscopic analysis and electrochemical study reveal the clear relationship between the surface modification and the band edge positions for water oxidation. The proposed concept has considerable potential to explore new, efficient solar water splitting systems.

KW - MnO

KW - band structure

KW - ligand engineering

KW - oxygen evolution catalysts

KW - water splitting

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Efficient Water Splitting Cascade Photoanodes with Ligand-Engineered MnO Cocatalysts

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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