Supersonically sprayed iron oxide nanoparticles with atomic-layer-deposited ZnO/TiO2 layers for solar water splitting

Tae Gun Kim; Bhavana Joshi; Chan Woo Park; Edmund Samuel; Min Woo Kim; Mark T. Swihart; Sam S. Yoon

doi:10.1016/j.jallcom.2019.05.255

Supersonically sprayed iron oxide nanoparticles with atomic-layer-deposited ZnO/TiO₂ layers for solar water splitting

Tae Gun Kim, Bhavana Joshi, Chan Woo Park, Edmund Samuel, Min Woo Kim, Mark T. Swihart, Sam S. Yoon

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

42 Citations (Scopus)

Abstract

We demonstrate a promising Fe₂O₃/ZnO/TiO₂ photoanode for photoelectrochemical water splitting. Passivation of the Fe₂O₃ surface with thin layers of ZnO and TiO₂ enhances the water splitting photocurrent density of Fe₂O₃. The increased photoelectrochemical activity of the hematite-based structure with heterojunctions, compared to that of bare Fe₂O₃, results from improved charge separation during water oxidation. The multilayered Fe₂O₃ film exhibits a seven-fold improvement in photocurrent density (to 4.25 mA cm⁻²) compared with bare Fe₂O₃, due to suppression of electron–hole recombination. The transient photocurrent density and impedance were evaluated to assess the effect of the passivation layer thickness and achieve a high photocurrent at low potential (0.7 V vs. Ag/AgCl) through improved light harvesting of the Fe₂O₃ film with an ultrathin ZnO/TiO₂ overlayer.

Original language	English
Pages (from-to)	35-44
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	798
DOIs	https://doi.org/10.1016/j.jallcom.2019.05.255
Publication status	Published - 2019 Aug 25

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

Atomic layer deposition
FeO
Solar water splitting
Supersonic cold spray
TiO
ZnO

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

UN SDGs

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

Access to Document

10.1016/j.jallcom.2019.05.255

Cite this

@article{a45f2426caa04da2be4cc11f7cc95079,

title = "Supersonically sprayed iron oxide nanoparticles with atomic-layer-deposited ZnO/TiO2 layers for solar water splitting",

abstract = "We demonstrate a promising Fe2O3/ZnO/TiO2 photoanode for photoelectrochemical water splitting. Passivation of the Fe2O3 surface with thin layers of ZnO and TiO2 enhances the water splitting photocurrent density of Fe2O3. The increased photoelectrochemical activity of the hematite-based structure with heterojunctions, compared to that of bare Fe2O3, results from improved charge separation during water oxidation. The multilayered Fe2O3 film exhibits a seven-fold improvement in photocurrent density (to 4.25 mA cm−2) compared with bare Fe2O3, due to suppression of electron–hole recombination. The transient photocurrent density and impedance were evaluated to assess the effect of the passivation layer thickness and achieve a high photocurrent at low potential (0.7 V vs. Ag/AgCl) through improved light harvesting of the Fe2O3 film with an ultrathin ZnO/TiO2 overlayer.",

keywords = "Atomic layer deposition, FeO, Solar water splitting, Supersonic cold spray, TiO, ZnO",

author = "Kim, {Tae Gun} and Bhavana Joshi and Park, {Chan Woo} and Edmund Samuel and Kim, {Min Woo} and Swihart, {Mark T.} and Yoon, {Sam S.}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = aug,

day = "25",

doi = "10.1016/j.jallcom.2019.05.255",

language = "English",

volume = "798",

pages = "35--44",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Supersonically sprayed iron oxide nanoparticles with atomic-layer-deposited ZnO/TiO2 layers for solar water splitting

AU - Kim, Tae Gun

AU - Joshi, Bhavana

AU - Park, Chan Woo

AU - Samuel, Edmund

AU - Kim, Min Woo

AU - Swihart, Mark T.

AU - Yoon, Sam S.

PY - 2019/8/25

Y1 - 2019/8/25

N2 - We demonstrate a promising Fe2O3/ZnO/TiO2 photoanode for photoelectrochemical water splitting. Passivation of the Fe2O3 surface with thin layers of ZnO and TiO2 enhances the water splitting photocurrent density of Fe2O3. The increased photoelectrochemical activity of the hematite-based structure with heterojunctions, compared to that of bare Fe2O3, results from improved charge separation during water oxidation. The multilayered Fe2O3 film exhibits a seven-fold improvement in photocurrent density (to 4.25 mA cm−2) compared with bare Fe2O3, due to suppression of electron–hole recombination. The transient photocurrent density and impedance were evaluated to assess the effect of the passivation layer thickness and achieve a high photocurrent at low potential (0.7 V vs. Ag/AgCl) through improved light harvesting of the Fe2O3 film with an ultrathin ZnO/TiO2 overlayer.

AB - We demonstrate a promising Fe2O3/ZnO/TiO2 photoanode for photoelectrochemical water splitting. Passivation of the Fe2O3 surface with thin layers of ZnO and TiO2 enhances the water splitting photocurrent density of Fe2O3. The increased photoelectrochemical activity of the hematite-based structure with heterojunctions, compared to that of bare Fe2O3, results from improved charge separation during water oxidation. The multilayered Fe2O3 film exhibits a seven-fold improvement in photocurrent density (to 4.25 mA cm−2) compared with bare Fe2O3, due to suppression of electron–hole recombination. The transient photocurrent density and impedance were evaluated to assess the effect of the passivation layer thickness and achieve a high photocurrent at low potential (0.7 V vs. Ag/AgCl) through improved light harvesting of the Fe2O3 film with an ultrathin ZnO/TiO2 overlayer.

KW - Atomic layer deposition

KW - FeO

KW - Solar water splitting

KW - Supersonic cold spray

KW - TiO

KW - ZnO

UR - http://www.scopus.com/inward/record.url?scp=85066269345&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2019.05.255

DO - 10.1016/j.jallcom.2019.05.255

M3 - Article

AN - SCOPUS:85066269345

SN - 0925-8388

VL - 798

SP - 35

EP - 44

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -