Visible-light sensitization and photoenergy storage in quantum dot/polyoxometalate systems

Tetsuya Kida, Hiromasa Furuso, Kota Kumamoto, Azzah Dyah Pramata, Masayoshi Yuasa, Kengo Shimanoe

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Abstract Recently, the process by which energy is transferred from photoexcited semiconductor nanocrystals, called quantum dots (QDs), to other semiconductors has attracted much attention and has potential application in solar energy conversion (i.e., QD-sensitized solar cells). Sensitization of wide band gap polyoxometalates (POMs) to visible light by using CuInS2 QDs dispersed in an organic solution is demonstrated herein. Photoluminescence quenching and lifetime studies revealed efficient electron transfer from the CuInS2 QDs to POMs, such as SiW12O40 and W10O32, that were hybridized with a cationic surfactant. CuInS2 QDs function as an antenna that absorbs visible light and supplies electrons to the POMs to enable certain photocatalytic reactions, including noble-metal-ion reduction. The photoenergy storage capabilities of the QD-POM system, in which electrons photogenerated in QDs by visible-light excitation are trapped and accommodated by POMs to form reduced POM, are also demonstrated. Electrons stored in the POM can be later discharged through reductive reactions, such as oxygen reduction, in the dark. Enhanced capabilities: CuInS2 quantum dots (QDs) are used to sensitize polyoxometalates (POMs) with wide band gaps. Visible-light-induced photocatalytic reactions proceed through the formation of one-electron-reduced POMs, which also show photoenergy-storing properties (see figure).

Original languageEnglish
Pages (from-to)7462-7469
Number of pages8
JournalChemistry - A European Journal
Volume21
Issue number20
DOIs
Publication statusPublished - May 11 2015

Fingerprint

Semiconductor quantum dots
Electrons
Energy gap
Semiconductor materials
polyoxometalate I
Cationic surfactants
Precious metals
Energy conversion
Nanocrystals
Solar energy
Metal ions
Quenching
Solar cells
Photoluminescence
Antennas
Oxygen

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Visible-light sensitization and photoenergy storage in quantum dot/polyoxometalate systems. / Kida, Tetsuya; Furuso, Hiromasa; Kumamoto, Kota; Pramata, Azzah Dyah; Yuasa, Masayoshi; Shimanoe, Kengo.

In: Chemistry - A European Journal, Vol. 21, No. 20, 11.05.2015, p. 7462-7469.

Research output: Contribution to journalArticle

Kida, Tetsuya ; Furuso, Hiromasa ; Kumamoto, Kota ; Pramata, Azzah Dyah ; Yuasa, Masayoshi ; Shimanoe, Kengo. / Visible-light sensitization and photoenergy storage in quantum dot/polyoxometalate systems. In: Chemistry - A European Journal. 2015 ; Vol. 21, No. 20. pp. 7462-7469.
@article{684b523ba2f64643bca96339a148fd90,
title = "Visible-light sensitization and photoenergy storage in quantum dot/polyoxometalate systems",
abstract = "Abstract Recently, the process by which energy is transferred from photoexcited semiconductor nanocrystals, called quantum dots (QDs), to other semiconductors has attracted much attention and has potential application in solar energy conversion (i.e., QD-sensitized solar cells). Sensitization of wide band gap polyoxometalates (POMs) to visible light by using CuInS2 QDs dispersed in an organic solution is demonstrated herein. Photoluminescence quenching and lifetime studies revealed efficient electron transfer from the CuInS2 QDs to POMs, such as SiW12O40 and W10O32, that were hybridized with a cationic surfactant. CuInS2 QDs function as an antenna that absorbs visible light and supplies electrons to the POMs to enable certain photocatalytic reactions, including noble-metal-ion reduction. The photoenergy storage capabilities of the QD-POM system, in which electrons photogenerated in QDs by visible-light excitation are trapped and accommodated by POMs to form reduced POM, are also demonstrated. Electrons stored in the POM can be later discharged through reductive reactions, such as oxygen reduction, in the dark. Enhanced capabilities: CuInS2 quantum dots (QDs) are used to sensitize polyoxometalates (POMs) with wide band gaps. Visible-light-induced photocatalytic reactions proceed through the formation of one-electron-reduced POMs, which also show photoenergy-storing properties (see figure).",
author = "Tetsuya Kida and Hiromasa Furuso and Kota Kumamoto and Pramata, {Azzah Dyah} and Masayoshi Yuasa and Kengo Shimanoe",
year = "2015",
month = "5",
day = "11",
doi = "10.1002/chem.201500021",
language = "English",
volume = "21",
pages = "7462--7469",
journal = "Chemistry - A European Journal",
issn = "0947-6539",
publisher = "Wiley-VCH Verlag",
number = "20",

}

TY - JOUR

T1 - Visible-light sensitization and photoenergy storage in quantum dot/polyoxometalate systems

AU - Kida, Tetsuya

AU - Furuso, Hiromasa

AU - Kumamoto, Kota

AU - Pramata, Azzah Dyah

AU - Yuasa, Masayoshi

AU - Shimanoe, Kengo

PY - 2015/5/11

Y1 - 2015/5/11

N2 - Abstract Recently, the process by which energy is transferred from photoexcited semiconductor nanocrystals, called quantum dots (QDs), to other semiconductors has attracted much attention and has potential application in solar energy conversion (i.e., QD-sensitized solar cells). Sensitization of wide band gap polyoxometalates (POMs) to visible light by using CuInS2 QDs dispersed in an organic solution is demonstrated herein. Photoluminescence quenching and lifetime studies revealed efficient electron transfer from the CuInS2 QDs to POMs, such as SiW12O40 and W10O32, that were hybridized with a cationic surfactant. CuInS2 QDs function as an antenna that absorbs visible light and supplies electrons to the POMs to enable certain photocatalytic reactions, including noble-metal-ion reduction. The photoenergy storage capabilities of the QD-POM system, in which electrons photogenerated in QDs by visible-light excitation are trapped and accommodated by POMs to form reduced POM, are also demonstrated. Electrons stored in the POM can be later discharged through reductive reactions, such as oxygen reduction, in the dark. Enhanced capabilities: CuInS2 quantum dots (QDs) are used to sensitize polyoxometalates (POMs) with wide band gaps. Visible-light-induced photocatalytic reactions proceed through the formation of one-electron-reduced POMs, which also show photoenergy-storing properties (see figure).

AB - Abstract Recently, the process by which energy is transferred from photoexcited semiconductor nanocrystals, called quantum dots (QDs), to other semiconductors has attracted much attention and has potential application in solar energy conversion (i.e., QD-sensitized solar cells). Sensitization of wide band gap polyoxometalates (POMs) to visible light by using CuInS2 QDs dispersed in an organic solution is demonstrated herein. Photoluminescence quenching and lifetime studies revealed efficient electron transfer from the CuInS2 QDs to POMs, such as SiW12O40 and W10O32, that were hybridized with a cationic surfactant. CuInS2 QDs function as an antenna that absorbs visible light and supplies electrons to the POMs to enable certain photocatalytic reactions, including noble-metal-ion reduction. The photoenergy storage capabilities of the QD-POM system, in which electrons photogenerated in QDs by visible-light excitation are trapped and accommodated by POMs to form reduced POM, are also demonstrated. Electrons stored in the POM can be later discharged through reductive reactions, such as oxygen reduction, in the dark. Enhanced capabilities: CuInS2 quantum dots (QDs) are used to sensitize polyoxometalates (POMs) with wide band gaps. Visible-light-induced photocatalytic reactions proceed through the formation of one-electron-reduced POMs, which also show photoenergy-storing properties (see figure).

UR - http://www.scopus.com/inward/record.url?scp=84928721669&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84928721669&partnerID=8YFLogxK

U2 - 10.1002/chem.201500021

DO - 10.1002/chem.201500021

M3 - Article

VL - 21

SP - 7462

EP - 7469

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

SN - 0947-6539

IS - 20

ER -