NH2-MIL-125(Ti)/TiO2 nanorod heterojunction photoanodes for efficient photoelectrochemical water splitting

Ji Won Yoon; Do Hong Kim; Jae Hyeok Kim; Ho Won Jang; Jong Heun Lee

doi:10.1016/j.apcatb.2018.11.057

NH₂-MIL-125(Ti)/TiO₂ nanorod heterojunction photoanodes for efficient photoelectrochemical water splitting

Ji Won Yoon, Do Hong Kim, Jae Hyeok Kim, Ho Won Jang, Jong Heun Lee

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

116 Citations (Scopus)

Abstract

A photoactive amine-functionalized Ti metal-organic framework (MOF) (MIL(125)-NH₂(Ti)) layer is uniformly coated on vertically ordered TiO₂ nanorods (NRs) via a facile hydrothermal reaction, and the performance of the heterojunction photoanode in photoelectrochemical (PEC) water splitting is studied. The photocurrent density of the MIL(125)-NH₂/TiO₂ NRs reaches 1.63 mA/cm² at 1.23 V vs. a reversible hydrogen electrode under AM 1.5 G simulated sunlight illumination, which is ∼2.7 times higher than that of pristine TiO₂ NRs. The incident photon-to-electron conversion efficiency of the MIL(125)-NH₂/TiO₂ NRs improves significantly at λ_max = 340 nm, implying the promotion of water oxidation through efficient light absorption and charge separation. The enhancement of the PEC activity in the TiO₂ NRs caused by an MIL(125)-NH₂ coating is discussed in relation to the surface area and elongated configuration of the TiO₂ NRs, the band gap of MIL(125)-NH₂(Ti), and the type (II) heterojunction. This study demonstrates the rational design of heterojunctions between the semiconductor and the MOF, which paves the way for new facile and general approaches to achieve a high efficiency in water splitting.

Original language	English
Pages (from-to)	511-518
Number of pages	8
Journal	Applied Catalysis B: Environmental
Volume	244
DOIs	https://doi.org/10.1016/j.apcatb.2018.11.057
Publication status	Published - 2019 May 5

Keywords

Hydrothermal reaction
MIL(125)-NH
Photoanode
Photoelectrochemical water splitting
TiO nanorod

ASJC Scopus subject areas

Catalysis
Environmental Science(all)
Process Chemistry and Technology

UN SDGs

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

Access to Document

10.1016/j.apcatb.2018.11.057

Cite this

@article{191be75dac654ec48798145ea69a6a20,

title = "NH2-MIL-125(Ti)/TiO2 nanorod heterojunction photoanodes for efficient photoelectrochemical water splitting",

abstract = "A photoactive amine-functionalized Ti metal-organic framework (MOF) (MIL(125)-NH2(Ti)) layer is uniformly coated on vertically ordered TiO2 nanorods (NRs) via a facile hydrothermal reaction, and the performance of the heterojunction photoanode in photoelectrochemical (PEC) water splitting is studied. The photocurrent density of the MIL(125)-NH2/TiO2 NRs reaches 1.63 mA/cm2 at 1.23 V vs. a reversible hydrogen electrode under AM 1.5 G simulated sunlight illumination, which is ∼2.7 times higher than that of pristine TiO2 NRs. The incident photon-to-electron conversion efficiency of the MIL(125)-NH2/TiO2 NRs improves significantly at λmax = 340 nm, implying the promotion of water oxidation through efficient light absorption and charge separation. The enhancement of the PEC activity in the TiO2 NRs caused by an MIL(125)-NH2 coating is discussed in relation to the surface area and elongated configuration of the TiO2 NRs, the band gap of MIL(125)-NH2(Ti), and the type (II) heterojunction. This study demonstrates the rational design of heterojunctions between the semiconductor and the MOF, which paves the way for new facile and general approaches to achieve a high efficiency in water splitting.",

keywords = "Hydrothermal reaction, MIL(125)-NH, Photoanode, Photoelectrochemical water splitting, TiO nanorod",

author = "Yoon, {Ji Won} and Kim, {Do Hong} and Kim, {Jae Hyeok} and Jang, {Ho Won} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by a grant from the National Research Foundation of Korea (NRF) , which was funded by the Korean government (Ministry of Education, Science, and Technology (MEST) , Grant No. 2016R1A2A1A05005331 ). Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

month = may,

day = "5",

doi = "10.1016/j.apcatb.2018.11.057",

language = "English",

volume = "244",

pages = "511--518",

journal = "Applied Catalysis B: Environmental",

issn = "0926-3373",

publisher = "Elsevier",

}

TY - JOUR

T1 - NH2-MIL-125(Ti)/TiO2 nanorod heterojunction photoanodes for efficient photoelectrochemical water splitting

AU - Yoon, Ji Won

AU - Kim, Do Hong

AU - Kim, Jae Hyeok

AU - Jang, Ho Won

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by a grant from the National Research Foundation of Korea (NRF) , which was funded by the Korean government (Ministry of Education, Science, and Technology (MEST) , Grant No. 2016R1A2A1A05005331 ). Publisher Copyright: © 2018 Elsevier B.V.

PY - 2019/5/5

Y1 - 2019/5/5

N2 - A photoactive amine-functionalized Ti metal-organic framework (MOF) (MIL(125)-NH2(Ti)) layer is uniformly coated on vertically ordered TiO2 nanorods (NRs) via a facile hydrothermal reaction, and the performance of the heterojunction photoanode in photoelectrochemical (PEC) water splitting is studied. The photocurrent density of the MIL(125)-NH2/TiO2 NRs reaches 1.63 mA/cm2 at 1.23 V vs. a reversible hydrogen electrode under AM 1.5 G simulated sunlight illumination, which is ∼2.7 times higher than that of pristine TiO2 NRs. The incident photon-to-electron conversion efficiency of the MIL(125)-NH2/TiO2 NRs improves significantly at λmax = 340 nm, implying the promotion of water oxidation through efficient light absorption and charge separation. The enhancement of the PEC activity in the TiO2 NRs caused by an MIL(125)-NH2 coating is discussed in relation to the surface area and elongated configuration of the TiO2 NRs, the band gap of MIL(125)-NH2(Ti), and the type (II) heterojunction. This study demonstrates the rational design of heterojunctions between the semiconductor and the MOF, which paves the way for new facile and general approaches to achieve a high efficiency in water splitting.

AB - A photoactive amine-functionalized Ti metal-organic framework (MOF) (MIL(125)-NH2(Ti)) layer is uniformly coated on vertically ordered TiO2 nanorods (NRs) via a facile hydrothermal reaction, and the performance of the heterojunction photoanode in photoelectrochemical (PEC) water splitting is studied. The photocurrent density of the MIL(125)-NH2/TiO2 NRs reaches 1.63 mA/cm2 at 1.23 V vs. a reversible hydrogen electrode under AM 1.5 G simulated sunlight illumination, which is ∼2.7 times higher than that of pristine TiO2 NRs. The incident photon-to-electron conversion efficiency of the MIL(125)-NH2/TiO2 NRs improves significantly at λmax = 340 nm, implying the promotion of water oxidation through efficient light absorption and charge separation. The enhancement of the PEC activity in the TiO2 NRs caused by an MIL(125)-NH2 coating is discussed in relation to the surface area and elongated configuration of the TiO2 NRs, the band gap of MIL(125)-NH2(Ti), and the type (II) heterojunction. This study demonstrates the rational design of heterojunctions between the semiconductor and the MOF, which paves the way for new facile and general approaches to achieve a high efficiency in water splitting.

KW - Hydrothermal reaction

KW - MIL(125)-NH

KW - Photoanode

KW - Photoelectrochemical water splitting

KW - TiO nanorod

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DO - 10.1016/j.apcatb.2018.11.057

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