Enhanced IR-driven photoelectrochemical responses of CdSe/ZnO heterostructures by up-conversion UV/visible light irradiation

Joo Won Lee; Ki Hyun Cho; Joon Soo Yoon; Yun Mo Sung

doi:10.1039/d0nr00477d

Enhanced IR-driven photoelectrochemical responses of CdSe/ZnO heterostructures by up-conversion UV/visible light irradiation

Joo Won Lee, Ki Hyun Cho, Joon Soo Yoon, Yun Mo Sung

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

12 Citations (Scopus)

Abstract

We, for the first time, report the development of infrared (IR)-driven photoelectrochemical (PEC) cells using up-conversion glass-ceramics as substrates, which is different from the previous strategies of decorating photocatalysts with up-conversion (UC) rare earth-doped fluoride nanoparticles to utilize IR light. Our approach is more efficient since the use of UC glass-ceramics as substrates of photocatalysts could overcome the chemical instability of fluoride nanoparticles, the blockage of incident light, and the limited exposure of photocatalysts to liquid electrolytes. Oxyfluoride glass-ceramics bearing (Yb,Er)-doped YF₃ and (Yb,Tm)-doped YF₃ nanocrystals turned out to generate UC green and ultraviolet/blue emissions, respectively, under 980 nm illumination. High-density ZnO nanorods were grown on the up-conversion glass-ceramic substrates by the hydrothermal method and they were subsequently overcoated with CdSe nanocrystals to obtain CdSe/ZnO heterostructures by the chemical bath deposition method. CdSe nanoparticles were excited by both the UC UV emission from Tm and the visible emission from Er and Tm, while ZnO nanorods were excited mostly by the UC UV emission from Tm. Because of the difference in the UC emissions from Er and Tm, two distinct carrier transportations, sensitization and type-II cascade, occurred in the identical CdSe/ZnO heterostructures. Eventually, CdSe/ZnO fabricated on the glass-ceramics bearing (Yb,Tm)-doped YF₃ showed increased photocurrent density compared to that fabricated on the glass-ceramics bearing (Yb,Er)-doped YF₃ due to the charge separation activated by the type-II cascade structure.

Original language	English
Pages (from-to)	8525-8535
Number of pages	11
Journal	Nanoscale
Volume	12
Issue number	15
DOIs	https://doi.org/10.1039/d0nr00477d
Publication status	Published - 2020 Apr 21

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation (NRF) of Korea grants funded by the Korean government (NRF-2016R1E1A1A01942834 and NRF-2020R1H1A2013378). The authors thank Dr Baik, H. of the Korea Basic Science Institute (KBSI) for kindly providing access to their FETEM. The authors also thank the Korea Basic Science Institute (KBSI) for HR-SEM measurements.

Publisher Copyright:
© 2020 The Royal Society of Chemistry.

ASJC Scopus subject areas

General Materials Science

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10.1039/d0nr00477d

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@article{346bbcbc8ac946e4bc30287471db6a90,

title = "Enhanced IR-driven photoelectrochemical responses of CdSe/ZnO heterostructures by up-conversion UV/visible light irradiation",

abstract = "We, for the first time, report the development of infrared (IR)-driven photoelectrochemical (PEC) cells using up-conversion glass-ceramics as substrates, which is different from the previous strategies of decorating photocatalysts with up-conversion (UC) rare earth-doped fluoride nanoparticles to utilize IR light. Our approach is more efficient since the use of UC glass-ceramics as substrates of photocatalysts could overcome the chemical instability of fluoride nanoparticles, the blockage of incident light, and the limited exposure of photocatalysts to liquid electrolytes. Oxyfluoride glass-ceramics bearing (Yb,Er)-doped YF3 and (Yb,Tm)-doped YF3 nanocrystals turned out to generate UC green and ultraviolet/blue emissions, respectively, under 980 nm illumination. High-density ZnO nanorods were grown on the up-conversion glass-ceramic substrates by the hydrothermal method and they were subsequently overcoated with CdSe nanocrystals to obtain CdSe/ZnO heterostructures by the chemical bath deposition method. CdSe nanoparticles were excited by both the UC UV emission from Tm and the visible emission from Er and Tm, while ZnO nanorods were excited mostly by the UC UV emission from Tm. Because of the difference in the UC emissions from Er and Tm, two distinct carrier transportations, sensitization and type-II cascade, occurred in the identical CdSe/ZnO heterostructures. Eventually, CdSe/ZnO fabricated on the glass-ceramics bearing (Yb,Tm)-doped YF3 showed increased photocurrent density compared to that fabricated on the glass-ceramics bearing (Yb,Er)-doped YF3 due to the charge separation activated by the type-II cascade structure.",

author = "Lee, {Joo Won} and Cho, {Ki Hyun} and Yoon, {Joon Soo} and Sung, {Yun Mo}",

note = "Funding Information: This research was supported by the National Research Foundation (NRF) of Korea grants funded by the Korean government (NRF-2016R1E1A1A01942834 and NRF-2020R1H1A2013378). The authors thank Dr Baik, H. of the Korea Basic Science Institute (KBSI) for kindly providing access to their FETEM. The authors also thank the Korea Basic Science Institute (KBSI) for HR-SEM measurements. Publisher Copyright: {\textcopyright} 2020 The Royal Society of Chemistry.",

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doi = "10.1039/d0nr00477d",

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AU - Sung, Yun Mo

N1 - Funding Information: This research was supported by the National Research Foundation (NRF) of Korea grants funded by the Korean government (NRF-2016R1E1A1A01942834 and NRF-2020R1H1A2013378). The authors thank Dr Baik, H. of the Korea Basic Science Institute (KBSI) for kindly providing access to their FETEM. The authors also thank the Korea Basic Science Institute (KBSI) for HR-SEM measurements. Publisher Copyright: © 2020 The Royal Society of Chemistry.

PY - 2020/4/21

Y1 - 2020/4/21

N2 - We, for the first time, report the development of infrared (IR)-driven photoelectrochemical (PEC) cells using up-conversion glass-ceramics as substrates, which is different from the previous strategies of decorating photocatalysts with up-conversion (UC) rare earth-doped fluoride nanoparticles to utilize IR light. Our approach is more efficient since the use of UC glass-ceramics as substrates of photocatalysts could overcome the chemical instability of fluoride nanoparticles, the blockage of incident light, and the limited exposure of photocatalysts to liquid electrolytes. Oxyfluoride glass-ceramics bearing (Yb,Er)-doped YF3 and (Yb,Tm)-doped YF3 nanocrystals turned out to generate UC green and ultraviolet/blue emissions, respectively, under 980 nm illumination. High-density ZnO nanorods were grown on the up-conversion glass-ceramic substrates by the hydrothermal method and they were subsequently overcoated with CdSe nanocrystals to obtain CdSe/ZnO heterostructures by the chemical bath deposition method. CdSe nanoparticles were excited by both the UC UV emission from Tm and the visible emission from Er and Tm, while ZnO nanorods were excited mostly by the UC UV emission from Tm. Because of the difference in the UC emissions from Er and Tm, two distinct carrier transportations, sensitization and type-II cascade, occurred in the identical CdSe/ZnO heterostructures. Eventually, CdSe/ZnO fabricated on the glass-ceramics bearing (Yb,Tm)-doped YF3 showed increased photocurrent density compared to that fabricated on the glass-ceramics bearing (Yb,Er)-doped YF3 due to the charge separation activated by the type-II cascade structure.

AB - We, for the first time, report the development of infrared (IR)-driven photoelectrochemical (PEC) cells using up-conversion glass-ceramics as substrates, which is different from the previous strategies of decorating photocatalysts with up-conversion (UC) rare earth-doped fluoride nanoparticles to utilize IR light. Our approach is more efficient since the use of UC glass-ceramics as substrates of photocatalysts could overcome the chemical instability of fluoride nanoparticles, the blockage of incident light, and the limited exposure of photocatalysts to liquid electrolytes. Oxyfluoride glass-ceramics bearing (Yb,Er)-doped YF3 and (Yb,Tm)-doped YF3 nanocrystals turned out to generate UC green and ultraviolet/blue emissions, respectively, under 980 nm illumination. High-density ZnO nanorods were grown on the up-conversion glass-ceramic substrates by the hydrothermal method and they were subsequently overcoated with CdSe nanocrystals to obtain CdSe/ZnO heterostructures by the chemical bath deposition method. CdSe nanoparticles were excited by both the UC UV emission from Tm and the visible emission from Er and Tm, while ZnO nanorods were excited mostly by the UC UV emission from Tm. Because of the difference in the UC emissions from Er and Tm, two distinct carrier transportations, sensitization and type-II cascade, occurred in the identical CdSe/ZnO heterostructures. Eventually, CdSe/ZnO fabricated on the glass-ceramics bearing (Yb,Tm)-doped YF3 showed increased photocurrent density compared to that fabricated on the glass-ceramics bearing (Yb,Er)-doped YF3 due to the charge separation activated by the type-II cascade structure.

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ER -

Enhanced IR-driven photoelectrochemical responses of CdSe/ZnO heterostructures by up-conversion UV/visible light irradiation

Abstract

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