Effect of porphyrin molecular structure on water splitting activity of a KTaO3 photocatalyst

Hidehisa Hagiwara; Kohei Higashi; Motonori Watanabe; Ryota Kakigi; Shintaro Ida; Tatsumi Ishihara

doi:10.3390/catal6030042

Effect of porphyrin molecular structure on water splitting activity of a KTaO₃ photocatalyst

Hidehisa Hagiwara, Kohei Higashi, Motonori Watanabe, Ryota Kakigi, Shintaro Ida, Tatsumi Ishihara

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

20 Citations (Scopus)

Abstract

Photocatalytic water splitting is one of the ideal methods for solving the global energy crisis and its associated environmental problems. In this study, the effect of altering the molecular structure of porphyrins was investigated to improve the water splitting activity of Zr-doped KTaO₃ (KTa(Zr)O₃) modified with porphyrin dyes. UV-vis spectra indicated that porphyrins with long alkoxy chains tended to form well-developed H-aggregates on the KTa(Zr)O₃ surface. The photocatalytic activity of Pt-loaded KTa(Zr)O₃ was improved by using porphyrins with longer alkoxy chains because of the improvement in the charge migration between porphyrin dye molecules. While the charge transfer between the inorganic semiconductor and porphyrin dye interface is important, it was found that the formation of H-aggregation was more effective in improving the water splitting activity of the porphyrin-modified photocatalysts.

Original language	English
Article number	42
Journal	Catalysts
Volume	6
Issue number	3
DOIs	https://doi.org/10.3390/catal6030042
Publication status	Published - Mar 10 2016

All Science Journal Classification (ASJC) codes

Catalysis
Physical and Theoretical Chemistry

UN SDGs

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

Access to Document

10.3390/catal6030042

Cite this

@article{1264aaa4c956417fa893435f7488a13f,

title = "Effect of porphyrin molecular structure on water splitting activity of a KTaO3 photocatalyst",

abstract = "Photocatalytic water splitting is one of the ideal methods for solving the global energy crisis and its associated environmental problems. In this study, the effect of altering the molecular structure of porphyrins was investigated to improve the water splitting activity of Zr-doped KTaO3 (KTa(Zr)O3) modified with porphyrin dyes. UV-vis spectra indicated that porphyrins with long alkoxy chains tended to form well-developed H-aggregates on the KTa(Zr)O3 surface. The photocatalytic activity of Pt-loaded KTa(Zr)O3 was improved by using porphyrins with longer alkoxy chains because of the improvement in the charge migration between porphyrin dye molecules. While the charge transfer between the inorganic semiconductor and porphyrin dye interface is important, it was found that the formation of H-aggregation was more effective in improving the water splitting activity of the porphyrin-modified photocatalysts.",

author = "Hidehisa Hagiwara and Kohei Higashi and Motonori Watanabe and Ryota Kakigi and Shintaro Ida and Tatsumi Ishihara",

year = "2016",

month = mar,

day = "10",

doi = "10.3390/catal6030042",

language = "English",

volume = "6",

journal = "Catalysts",

issn = "2073-4344",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "3",

}

TY - JOUR

T1 - Effect of porphyrin molecular structure on water splitting activity of a KTaO3 photocatalyst

AU - Hagiwara, Hidehisa

AU - Higashi, Kohei

AU - Watanabe, Motonori

AU - Kakigi, Ryota

AU - Ida, Shintaro

AU - Ishihara, Tatsumi

PY - 2016/3/10

Y1 - 2016/3/10

N2 - Photocatalytic water splitting is one of the ideal methods for solving the global energy crisis and its associated environmental problems. In this study, the effect of altering the molecular structure of porphyrins was investigated to improve the water splitting activity of Zr-doped KTaO3 (KTa(Zr)O3) modified with porphyrin dyes. UV-vis spectra indicated that porphyrins with long alkoxy chains tended to form well-developed H-aggregates on the KTa(Zr)O3 surface. The photocatalytic activity of Pt-loaded KTa(Zr)O3 was improved by using porphyrins with longer alkoxy chains because of the improvement in the charge migration between porphyrin dye molecules. While the charge transfer between the inorganic semiconductor and porphyrin dye interface is important, it was found that the formation of H-aggregation was more effective in improving the water splitting activity of the porphyrin-modified photocatalysts.

AB - Photocatalytic water splitting is one of the ideal methods for solving the global energy crisis and its associated environmental problems. In this study, the effect of altering the molecular structure of porphyrins was investigated to improve the water splitting activity of Zr-doped KTaO3 (KTa(Zr)O3) modified with porphyrin dyes. UV-vis spectra indicated that porphyrins with long alkoxy chains tended to form well-developed H-aggregates on the KTa(Zr)O3 surface. The photocatalytic activity of Pt-loaded KTa(Zr)O3 was improved by using porphyrins with longer alkoxy chains because of the improvement in the charge migration between porphyrin dye molecules. While the charge transfer between the inorganic semiconductor and porphyrin dye interface is important, it was found that the formation of H-aggregation was more effective in improving the water splitting activity of the porphyrin-modified photocatalysts.

UR - http://www.scopus.com/inward/record.url?scp=84960465387&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84960465387&partnerID=8YFLogxK

U2 - 10.3390/catal6030042

DO - 10.3390/catal6030042

M3 - Article

AN - SCOPUS:84960465387

SN - 2073-4344

VL - 6

JO - Catalysts

JF - Catalysts

IS - 3

M1 - 42

ER -