Heterojunction between bimetallic metal-organic framework and TiO2: Band-structure engineering for effective photoelectrochemical water splitting

Ji Won Yoon; Jae Hyeok Kim; Young Moo Jo; Jong Heun Lee

doi:10.1007/s12274-022-4451-y

Heterojunction between bimetallic metal-organic framework and TiO₂: Band-structure engineering for effective photoelectrochemical water splitting

Ji Won Yoon
, Jae Hyeok Kim
, Young Moo Jo
, Jong Heun Lee^*

^*Corresponding author for this work

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

26 Citations (Scopus)

Abstract

Bimetallic Fe/Ni-based metal-organic frameworks (MOFs) with different Fe/Ni ratios were coated on TiO₂ nanorods (NRs), and the performances of the heterojunction photoanodes in photoelectrochemical water splitting were investigated. The bandgaps and band positions of the MOFs could be modulated by changing the ratio of the Fe and Ni components. An ideal band alignment was achieved between the TiO₂ NRs and bimetallic MOFs with an optimum ratio of [Fe]/[Ni] = 0.25/0.75, which allowed efficient light absorption and charge separation. The coating of NH₂−MIL(Fe)−88 layer on the TiO₂ NRs decreased the photocurrent density by 33%. In comparison, TiO₂/NH₂−MIL(Ni)−88 showed a modest improvement in photocurrent density (0.85 mA·cm⁻² at 1.23 V vs. a reversible hydrogen electrode (RHE)). When bimetallic NH₂−MIL(Fe_0.25Ni_0.75)−88 was coated on the TiO₂ NRs, the photocurrent density reached 1.56 mA·cm⁻², which was an efficiency enhancement of 3.2 times. The mechanism underlying high photoelectrochemical performance was investigated. [Figure not available: see fulltext.].

Original language	English
Pages (from-to)	8502-8509
Number of pages	8
Journal	Nano Research
Volume	15
Issue number	9
DOIs	https://doi.org/10.1007/s12274-022-4451-y
Publication status	Published - 2022 Sept

Bibliographical note

Funding Information:
This work was supported by a grant from the Korea Environmental Industry & Technology Institute (No. 2020002700011).

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2020R1A2C3008933).

Publisher Copyright:
© 2022, Tsinghua University Press.

UN SDGs

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

SDG 7 Affordable and Clean Energy

Keywords

NH-MIL-88
TiO nanorods
band-structure engineering
bimetallic metal-organic frameworks (MOFs)
solar water splitting

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1007/s12274-022-4451-y

Cite this

@article{900e70262e6d49a4adb1c779f2807caf,

title = "Heterojunction between bimetallic metal-organic framework and TiO2: Band-structure engineering for effective photoelectrochemical water splitting",

abstract = "Bimetallic Fe/Ni-based metal-organic frameworks (MOFs) with different Fe/Ni ratios were coated on TiO2 nanorods (NRs), and the performances of the heterojunction photoanodes in photoelectrochemical water splitting were investigated. The bandgaps and band positions of the MOFs could be modulated by changing the ratio of the Fe and Ni components. An ideal band alignment was achieved between the TiO2 NRs and bimetallic MOFs with an optimum ratio of [Fe]/[Ni] = 0.25/0.75, which allowed efficient light absorption and charge separation. The coating of NH2−MIL(Fe)−88 layer on the TiO2 NRs decreased the photocurrent density by 33\%. In comparison, TiO2/NH2−MIL(Ni)−88 showed a modest improvement in photocurrent density (0.85 mA·cm−2 at 1.23 V vs. a reversible hydrogen electrode (RHE)). When bimetallic NH2−MIL(Fe0.25Ni0.75)−88 was coated on the TiO2 NRs, the photocurrent density reached 1.56 mA·cm−2, which was an efficiency enhancement of 3.2 times. The mechanism underlying high photoelectrochemical performance was investigated. [Figure not available: see fulltext.].",

keywords = "NH-MIL-88, TiO nanorods, band-structure engineering, bimetallic metal-organic frameworks (MOFs), solar water splitting",

author = "Yoon, \{Ji Won\} and Kim, \{Jae Hyeok\} and Jo, \{Young Moo\} and Lee, \{Jong Heun\}",

note = "Funding Information: This work was supported by a grant from the Korea Environmental Industry \& Technology Institute (No. 2020002700011). Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2020R1A2C3008933). Publisher Copyright: {\textcopyright} 2022, Tsinghua University Press.",

year = "2022",

month = sep,

doi = "10.1007/s12274-022-4451-y",

language = "English",

volume = "15",

pages = "8502--8509",

journal = "Nano Research",

issn = "1998-0124",

publisher = "Tsinghua University Press",

number = "9",

}

TY - JOUR

T1 - Heterojunction between bimetallic metal-organic framework and TiO2

T2 - Band-structure engineering for effective photoelectrochemical water splitting

AU - Yoon, Ji Won

AU - Kim, Jae Hyeok

AU - Jo, Young Moo

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by a grant from the Korea Environmental Industry & Technology Institute (No. 2020002700011). Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2020R1A2C3008933). Publisher Copyright: © 2022, Tsinghua University Press.

PY - 2022/9

Y1 - 2022/9

N2 - Bimetallic Fe/Ni-based metal-organic frameworks (MOFs) with different Fe/Ni ratios were coated on TiO2 nanorods (NRs), and the performances of the heterojunction photoanodes in photoelectrochemical water splitting were investigated. The bandgaps and band positions of the MOFs could be modulated by changing the ratio of the Fe and Ni components. An ideal band alignment was achieved between the TiO2 NRs and bimetallic MOFs with an optimum ratio of [Fe]/[Ni] = 0.25/0.75, which allowed efficient light absorption and charge separation. The coating of NH2−MIL(Fe)−88 layer on the TiO2 NRs decreased the photocurrent density by 33%. In comparison, TiO2/NH2−MIL(Ni)−88 showed a modest improvement in photocurrent density (0.85 mA·cm−2 at 1.23 V vs. a reversible hydrogen electrode (RHE)). When bimetallic NH2−MIL(Fe0.25Ni0.75)−88 was coated on the TiO2 NRs, the photocurrent density reached 1.56 mA·cm−2, which was an efficiency enhancement of 3.2 times. The mechanism underlying high photoelectrochemical performance was investigated. [Figure not available: see fulltext.].

AB - Bimetallic Fe/Ni-based metal-organic frameworks (MOFs) with different Fe/Ni ratios were coated on TiO2 nanorods (NRs), and the performances of the heterojunction photoanodes in photoelectrochemical water splitting were investigated. The bandgaps and band positions of the MOFs could be modulated by changing the ratio of the Fe and Ni components. An ideal band alignment was achieved between the TiO2 NRs and bimetallic MOFs with an optimum ratio of [Fe]/[Ni] = 0.25/0.75, which allowed efficient light absorption and charge separation. The coating of NH2−MIL(Fe)−88 layer on the TiO2 NRs decreased the photocurrent density by 33%. In comparison, TiO2/NH2−MIL(Ni)−88 showed a modest improvement in photocurrent density (0.85 mA·cm−2 at 1.23 V vs. a reversible hydrogen electrode (RHE)). When bimetallic NH2−MIL(Fe0.25Ni0.75)−88 was coated on the TiO2 NRs, the photocurrent density reached 1.56 mA·cm−2, which was an efficiency enhancement of 3.2 times. The mechanism underlying high photoelectrochemical performance was investigated. [Figure not available: see fulltext.].

KW - NH-MIL-88

KW - TiO nanorods

KW - band-structure engineering

KW - bimetallic metal-organic frameworks (MOFs)

KW - solar water splitting

UR - https://www.scopus.com/pages/publications/85130427872

U2 - 10.1007/s12274-022-4451-y

DO - 10.1007/s12274-022-4451-y

M3 - Article

AN - SCOPUS:85130427872

SN - 1998-0124

VL - 15

SP - 8502

EP - 8509

JO - Nano Research

JF - Nano Research

IS - 9

ER -