New Insights into the Electron-Collection Efficiency Improvement of CdS-Sensitized TiO 2 Nanorod Photoelectrodes by Interfacial Seed-Layer Mediation

Yu Lin Chen, Yu Hung Chen, Jie Wen Chen, Fengren Cao, Liang Li, Zheng Ming Luo, Ing Chi Leu, Ying Chih Pu

研究成果: Article

3 引文 (Scopus)

摘要

Titanium dioxide (TiO 2 ) nanorods (NRs) are widely used as photoanodes in photoelectrochemical (PEC) solar fuel production because of their remarkable photoactivity and stability. In addition, TiO 2 NR electrode materials can be decorated with active CdS quantum dots (QDs) to expand the sunlight photon capture. The overall photoelectric conversion efficiency for TiO 2 NR or QD-sensitized TiO 2 NR electrode materials in PEC is typically dominated by their interfacial electron transfer (ET) properties. To understand the key factors affecting the ET, the anatase TiO 2 seed layer was added into the interface between the rutile TiO 2 NRs and fluorine-doped tin oxide (FTO) substrate. This seed layer enhanced the photocatalytic performance of both the TiO 2 NR and CdS QD-sensitized TiO 2 NR photoanodes in PEC. Time-resolved photoluminescence spectroscopy and PEC analyses, including Mott-Schottky, electrochemical impedance spectroscopy, and photovoltage (V ph ) measurements, were used to study the charge-carrier dynamics at the interfaces between the FTO, TiO 2 , and CdS QD. Analysis of the results showed that band alignment at the anatase/rutile junction between the TiO 2 and FTO promoted electron-collection efficiency (e EC ) at the FTO/TiO 2 interface and ET rate constant (k ET ) at the TiO 2 /CdS QD interface. Furthermore, 34% enhancement of the efficiency in hydrogen (H 2 ) generation demonstrated the potential of the TiO 2 seed-layer-mediated TiO 2 /CdS QD NR photoanode in the application of PEC solar fuel production. The current work represents new insights into the mechanism of ET in TiO 2 and TiO 2 /CdS QD NR, which is very useful for the development of photoelectrode materials in solar energy conversions.

原文English
頁(從 - 到)8126-8137
頁數12
期刊ACS Applied Materials and Interfaces
11
發行號8
DOIs
出版狀態Published - 2019 二月 27

指紋

Nanorods
Seed
Semiconductor quantum dots
Electrons
Fluorine
Tin oxides
Titanium dioxide
Hydrogen
Electrodes
Photoluminescence spectroscopy
Charge carriers
Electrochemical impedance spectroscopy
Energy conversion
Solar energy
Conversion efficiency
Rate constants
Photons
titanium dioxide
stannic oxide
Substrates

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

引用此文

Chen, Yu Lin ; Chen, Yu Hung ; Chen, Jie Wen ; Cao, Fengren ; Li, Liang ; Luo, Zheng Ming ; Leu, Ing Chi ; Pu, Ying Chih. / New Insights into the Electron-Collection Efficiency Improvement of CdS-Sensitized TiO 2 Nanorod Photoelectrodes by Interfacial Seed-Layer Mediation 於: ACS Applied Materials and Interfaces. 2019 ; 卷 11, 編號 8. 頁 8126-8137.
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title = "New Insights into the Electron-Collection Efficiency Improvement of CdS-Sensitized TiO 2 Nanorod Photoelectrodes by Interfacial Seed-Layer Mediation",
abstract = "Titanium dioxide (TiO 2 ) nanorods (NRs) are widely used as photoanodes in photoelectrochemical (PEC) solar fuel production because of their remarkable photoactivity and stability. In addition, TiO 2 NR electrode materials can be decorated with active CdS quantum dots (QDs) to expand the sunlight photon capture. The overall photoelectric conversion efficiency for TiO 2 NR or QD-sensitized TiO 2 NR electrode materials in PEC is typically dominated by their interfacial electron transfer (ET) properties. To understand the key factors affecting the ET, the anatase TiO 2 seed layer was added into the interface between the rutile TiO 2 NRs and fluorine-doped tin oxide (FTO) substrate. This seed layer enhanced the photocatalytic performance of both the TiO 2 NR and CdS QD-sensitized TiO 2 NR photoanodes in PEC. Time-resolved photoluminescence spectroscopy and PEC analyses, including Mott-Schottky, electrochemical impedance spectroscopy, and photovoltage (V ph ) measurements, were used to study the charge-carrier dynamics at the interfaces between the FTO, TiO 2 , and CdS QD. Analysis of the results showed that band alignment at the anatase/rutile junction between the TiO 2 and FTO promoted electron-collection efficiency (e EC ) at the FTO/TiO 2 interface and ET rate constant (k ET ) at the TiO 2 /CdS QD interface. Furthermore, 34{\%} enhancement of the efficiency in hydrogen (H 2 ) generation demonstrated the potential of the TiO 2 seed-layer-mediated TiO 2 /CdS QD NR photoanode in the application of PEC solar fuel production. The current work represents new insights into the mechanism of ET in TiO 2 and TiO 2 /CdS QD NR, which is very useful for the development of photoelectrode materials in solar energy conversions.",
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New Insights into the Electron-Collection Efficiency Improvement of CdS-Sensitized TiO 2 Nanorod Photoelectrodes by Interfacial Seed-Layer Mediation . / Chen, Yu Lin; Chen, Yu Hung; Chen, Jie Wen; Cao, Fengren; Li, Liang; Luo, Zheng Ming; Leu, Ing Chi; Pu, Ying Chih.

於: ACS Applied Materials and Interfaces, 卷 11, 編號 8, 27.02.2019, p. 8126-8137.

研究成果: Article

TY - JOUR

T1 - New Insights into the Electron-Collection Efficiency Improvement of CdS-Sensitized TiO 2 Nanorod Photoelectrodes by Interfacial Seed-Layer Mediation

AU - Chen, Yu Lin

AU - Chen, Yu Hung

AU - Chen, Jie Wen

AU - Cao, Fengren

AU - Li, Liang

AU - Luo, Zheng Ming

AU - Leu, Ing Chi

AU - Pu, Ying Chih

PY - 2019/2/27

Y1 - 2019/2/27

N2 - Titanium dioxide (TiO 2 ) nanorods (NRs) are widely used as photoanodes in photoelectrochemical (PEC) solar fuel production because of their remarkable photoactivity and stability. In addition, TiO 2 NR electrode materials can be decorated with active CdS quantum dots (QDs) to expand the sunlight photon capture. The overall photoelectric conversion efficiency for TiO 2 NR or QD-sensitized TiO 2 NR electrode materials in PEC is typically dominated by their interfacial electron transfer (ET) properties. To understand the key factors affecting the ET, the anatase TiO 2 seed layer was added into the interface between the rutile TiO 2 NRs and fluorine-doped tin oxide (FTO) substrate. This seed layer enhanced the photocatalytic performance of both the TiO 2 NR and CdS QD-sensitized TiO 2 NR photoanodes in PEC. Time-resolved photoluminescence spectroscopy and PEC analyses, including Mott-Schottky, electrochemical impedance spectroscopy, and photovoltage (V ph ) measurements, were used to study the charge-carrier dynamics at the interfaces between the FTO, TiO 2 , and CdS QD. Analysis of the results showed that band alignment at the anatase/rutile junction between the TiO 2 and FTO promoted electron-collection efficiency (e EC ) at the FTO/TiO 2 interface and ET rate constant (k ET ) at the TiO 2 /CdS QD interface. Furthermore, 34% enhancement of the efficiency in hydrogen (H 2 ) generation demonstrated the potential of the TiO 2 seed-layer-mediated TiO 2 /CdS QD NR photoanode in the application of PEC solar fuel production. The current work represents new insights into the mechanism of ET in TiO 2 and TiO 2 /CdS QD NR, which is very useful for the development of photoelectrode materials in solar energy conversions.

AB - Titanium dioxide (TiO 2 ) nanorods (NRs) are widely used as photoanodes in photoelectrochemical (PEC) solar fuel production because of their remarkable photoactivity and stability. In addition, TiO 2 NR electrode materials can be decorated with active CdS quantum dots (QDs) to expand the sunlight photon capture. The overall photoelectric conversion efficiency for TiO 2 NR or QD-sensitized TiO 2 NR electrode materials in PEC is typically dominated by their interfacial electron transfer (ET) properties. To understand the key factors affecting the ET, the anatase TiO 2 seed layer was added into the interface between the rutile TiO 2 NRs and fluorine-doped tin oxide (FTO) substrate. This seed layer enhanced the photocatalytic performance of both the TiO 2 NR and CdS QD-sensitized TiO 2 NR photoanodes in PEC. Time-resolved photoluminescence spectroscopy and PEC analyses, including Mott-Schottky, electrochemical impedance spectroscopy, and photovoltage (V ph ) measurements, were used to study the charge-carrier dynamics at the interfaces between the FTO, TiO 2 , and CdS QD. Analysis of the results showed that band alignment at the anatase/rutile junction between the TiO 2 and FTO promoted electron-collection efficiency (e EC ) at the FTO/TiO 2 interface and ET rate constant (k ET ) at the TiO 2 /CdS QD interface. Furthermore, 34% enhancement of the efficiency in hydrogen (H 2 ) generation demonstrated the potential of the TiO 2 seed-layer-mediated TiO 2 /CdS QD NR photoanode in the application of PEC solar fuel production. The current work represents new insights into the mechanism of ET in TiO 2 and TiO 2 /CdS QD NR, which is very useful for the development of photoelectrode materials in solar energy conversions.

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