Cocatalyst engineering of a narrow bandgap Ga-La5Ti2Cu0.9Ag0.1O7S5photocatalyst towards effectively enhanced water splitting

Qi Xiao; Jiadong Xiao; Junie Jhon M. Vequizo; Takashi Hisatomi; Mamiko Nakabayashi; Shanshan Chen; Zhenhua Pan; Lihua Lin; Naoya Shibata; Akira Yamakata; Tsuyoshi Takata; Kazunari Domen

doi:10.1039/d1ta08770c

Cocatalyst engineering of a narrow bandgap Ga-La₅Ti₂Cu_0.9Ag_0.1O₇S₅photocatalyst towards effectively enhanced water splitting

Qi Xiao, Jiadong Xiao, Junie Jhon M. Vequizo, Takashi Hisatomi, Mamiko Nakabayashi, Shanshan Chen, Zhenhua Pan, Lihua Lin, Naoya Shibata, Akira Yamakata, Tsuyoshi Takata, Kazunari Domen

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

4 Citations (Scopus)

Abstract

Ga-La₅Ti₂Cu_0.9Ag_0.1O₇S₅(Ga-LTCA), an oxysulfide photocatalyst, can act as a hydrogen evolution photocatalyst in Z-scheme water splitting systems in conjunction with an oxygen evolution photocatalyst (OEP) under visible light irradiation up to 700 nm. However, the overall efficiency is strongly limited by the low activity of Ga-LTCA. The present work demonstrates a drastic improvement in the H₂evolution activity of Ga-LTCA after loading small Rh cocatalyst particles exhibiting uniform dispersion and intimate contact with the photocatalyst. Using this system, an apparent quantum yield (AQY) of 11.2 ± 0.9% at 420 nm was obtained for H₂evolution from an aqueous Na₂S-Na₂SO₃solution, this being the highest value yet reported for a sacrificial H₂evolution reaction using an oxysulfide photocatalyst. Following modification with a Cr₂O₃layer, efficient Z-scheme water splitting was also accomplished using the cocatalyst-loaded Ga-LTCA in combination with H⁺/Cs⁺/PtO_x/WO₃as the OEP, with an improved AQY of 2.4% at 420 nm.

Original language	English
Pages (from-to)	27485-27492
Number of pages	8
Journal	Journal of Materials Chemistry A
Volume	9
Issue number	48
DOIs	https://doi.org/10.1039/d1ta08770c
Publication status	Published - Dec 28 2021
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

UN SDGs

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

Access to Document

10.1039/d1ta08770c

Cite this

Xiao, Q., Xiao, J., Vequizo, J. J. M., Hisatomi, T., Nakabayashi, M., Chen, S., Pan, Z., Lin, L., Shibata, N., Yamakata, A., Takata, T., & Domen, K. (2021). Cocatalyst engineering of a narrow bandgap Ga-La₅Ti₂Cu_0.9Ag_0.1O₇S₅photocatalyst towards effectively enhanced water splitting. Journal of Materials Chemistry A, 9(48), 27485-27492. https://doi.org/10.1039/d1ta08770c

@article{3dc0ac91b77e4649a86d02dd2410b0c5,

title = "Cocatalyst engineering of a narrow bandgap Ga-La5Ti2Cu0.9Ag0.1O7S5photocatalyst towards effectively enhanced water splitting",

abstract = "Ga-La5Ti2Cu0.9Ag0.1O7S5(Ga-LTCA), an oxysulfide photocatalyst, can act as a hydrogen evolution photocatalyst in Z-scheme water splitting systems in conjunction with an oxygen evolution photocatalyst (OEP) under visible light irradiation up to 700 nm. However, the overall efficiency is strongly limited by the low activity of Ga-LTCA. The present work demonstrates a drastic improvement in the H2evolution activity of Ga-LTCA after loading small Rh cocatalyst particles exhibiting uniform dispersion and intimate contact with the photocatalyst. Using this system, an apparent quantum yield (AQY) of 11.2 ± 0.9% at 420 nm was obtained for H2evolution from an aqueous Na2S-Na2SO3solution, this being the highest value yet reported for a sacrificial H2evolution reaction using an oxysulfide photocatalyst. Following modification with a Cr2O3layer, efficient Z-scheme water splitting was also accomplished using the cocatalyst-loaded Ga-LTCA in combination with H+/Cs+/PtOx/WO3as the OEP, with an improved AQY of 2.4% at 420 nm.",

author = "Qi Xiao and Jiadong Xiao and Vequizo, {Junie Jhon M.} and Takashi Hisatomi and Mamiko Nakabayashi and Shanshan Chen and Zhenhua Pan and Lihua Lin and Naoya Shibata and Akira Yamakata and Tsuyoshi Takata and Kazunari Domen",

note = "Funding Information: This work was financially supported by the Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO). Q. X. thanks the Japan Society for the Promotion of Science for providing a Postdoctoral Fellowship for Foreign Researchers (no. P19336). The authors thank Ms Michiko Obata and Dr Nobuyuki Zettsu of Shinshu University, and Ms Keiko Kato of the University of Tokyo for assistance during XPS analyses, and contact angle and ICP-AES measurements, respectively. A part of this study was supported by the University of Tokyo Advanced Characterization Nanotechnology Platform in the Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (JPMXP09-A-20-UT-0004). Funding Information: This work was nancially supported by the Articial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO). Q. X. thanks the Japan Society for the Promotion of Science for providing a Postdoctoral Fellowship for Foreign Researchers (no. P19336). The authors thank Ms Michiko Obata and Dr Nobuyuki Zettsu of Shinshu University, and Ms Keiko Kato of the University of Tokyo for assistance during XPS analyses, and contact angle and ICP-AES measurements, respectively. A part of this study was supported by the University of Tokyo Advanced Characterization Nanotechnology Platform in the Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (JPMXP09-A-20-UT-0004). Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2021.",

year = "2021",

month = dec,

day = "28",

doi = "10.1039/d1ta08770c",

language = "English",

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TY - JOUR

T1 - Cocatalyst engineering of a narrow bandgap Ga-La5Ti2Cu0.9Ag0.1O7S5photocatalyst towards effectively enhanced water splitting

AU - Xiao, Qi

AU - Xiao, Jiadong

AU - Vequizo, Junie Jhon M.

AU - Hisatomi, Takashi

AU - Nakabayashi, Mamiko

AU - Chen, Shanshan

AU - Pan, Zhenhua

AU - Lin, Lihua

AU - Shibata, Naoya

AU - Yamakata, Akira

AU - Takata, Tsuyoshi

AU - Domen, Kazunari

N1 - Funding Information: This work was financially supported by the Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO). Q. X. thanks the Japan Society for the Promotion of Science for providing a Postdoctoral Fellowship for Foreign Researchers (no. P19336). The authors thank Ms Michiko Obata and Dr Nobuyuki Zettsu of Shinshu University, and Ms Keiko Kato of the University of Tokyo for assistance during XPS analyses, and contact angle and ICP-AES measurements, respectively. A part of this study was supported by the University of Tokyo Advanced Characterization Nanotechnology Platform in the Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (JPMXP09-A-20-UT-0004). Funding Information: This work was nancially supported by the Articial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO). Q. X. thanks the Japan Society for the Promotion of Science for providing a Postdoctoral Fellowship for Foreign Researchers (no. P19336). The authors thank Ms Michiko Obata and Dr Nobuyuki Zettsu of Shinshu University, and Ms Keiko Kato of the University of Tokyo for assistance during XPS analyses, and contact angle and ICP-AES measurements, respectively. A part of this study was supported by the University of Tokyo Advanced Characterization Nanotechnology Platform in the Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (JPMXP09-A-20-UT-0004). Publisher Copyright: © The Royal Society of Chemistry 2021.

PY - 2021/12/28

Y1 - 2021/12/28

N2 - Ga-La5Ti2Cu0.9Ag0.1O7S5(Ga-LTCA), an oxysulfide photocatalyst, can act as a hydrogen evolution photocatalyst in Z-scheme water splitting systems in conjunction with an oxygen evolution photocatalyst (OEP) under visible light irradiation up to 700 nm. However, the overall efficiency is strongly limited by the low activity of Ga-LTCA. The present work demonstrates a drastic improvement in the H2evolution activity of Ga-LTCA after loading small Rh cocatalyst particles exhibiting uniform dispersion and intimate contact with the photocatalyst. Using this system, an apparent quantum yield (AQY) of 11.2 ± 0.9% at 420 nm was obtained for H2evolution from an aqueous Na2S-Na2SO3solution, this being the highest value yet reported for a sacrificial H2evolution reaction using an oxysulfide photocatalyst. Following modification with a Cr2O3layer, efficient Z-scheme water splitting was also accomplished using the cocatalyst-loaded Ga-LTCA in combination with H+/Cs+/PtOx/WO3as the OEP, with an improved AQY of 2.4% at 420 nm.

AB - Ga-La5Ti2Cu0.9Ag0.1O7S5(Ga-LTCA), an oxysulfide photocatalyst, can act as a hydrogen evolution photocatalyst in Z-scheme water splitting systems in conjunction with an oxygen evolution photocatalyst (OEP) under visible light irradiation up to 700 nm. However, the overall efficiency is strongly limited by the low activity of Ga-LTCA. The present work demonstrates a drastic improvement in the H2evolution activity of Ga-LTCA after loading small Rh cocatalyst particles exhibiting uniform dispersion and intimate contact with the photocatalyst. Using this system, an apparent quantum yield (AQY) of 11.2 ± 0.9% at 420 nm was obtained for H2evolution from an aqueous Na2S-Na2SO3solution, this being the highest value yet reported for a sacrificial H2evolution reaction using an oxysulfide photocatalyst. Following modification with a Cr2O3layer, efficient Z-scheme water splitting was also accomplished using the cocatalyst-loaded Ga-LTCA in combination with H+/Cs+/PtOx/WO3as the OEP, with an improved AQY of 2.4% at 420 nm.

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U2 - 10.1039/d1ta08770c

DO - 10.1039/d1ta08770c

M3 - Article

AN - SCOPUS:85121532462

SN - 2050-7488

VL - 9

SP - 27485

EP - 27492

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 48

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