Atomic layer deposition of metastable β-Fe2O3 via isomorphic epitaxy for photoassisted water oxidation

Jonathan Daniel Emery; Christian M. Schlepütz; Peijun Guo; Shannon C. Riha; R P H Chang; Alex B.F. Martinson

doi:10.1021/am507065y

Atomic layer deposition of metastable β-Fe₂O₃ via isomorphic epitaxy for photoassisted water oxidation

Jonathan Daniel Emery, Christian M. Schlepütz, Peijun Guo, Shannon C. Riha, R P H Chang, Alex B.F. Martinson^*

^*Corresponding author for this work

Materials Science and Engineering

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

29 Scopus citations

Abstract

We report the growth and photoelectrochemical (PEC) characterization of the uncommon bibyite phase of iron(III) oxide (β-Fe₂O₃) epitaxially stabilized via atomic layer deposition on an conductive, transparent, and isomorphic template (Sn-doped In₂O₃). As a photoanode, unoptimized β-Fe₂O₃ ultrathin films perform similarly to their ubiquitous α-phase (hematite) counterpart, but reveal a more ideal bandgap (1.8 eV), a ∼0.1 V improved photocurrent onset potential, and longer wavelength (>600 nm) spectral response. Stable operation under basic water oxidation justifies further exploration of this atypical phase and motivates the investigation of other unexplored metastable phases as new PEC materials.

Original language	English (US)
Pages (from-to)	21894-21900
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	6
Issue number	24
DOIs	https://doi.org/10.1021/am507065y
State	Published - Dec 24 2014

Keywords

PEC water oxidation
atomic layer deposition
epitaxial stabilization
iron(III) oxide
α-FeO
β-FeO

ASJC Scopus subject areas

General Materials Science

Access to Document

10.1021/am507065y

Cite this

@article{d6e6011fd9e4445d922a3c2fe00374fc,

title = "Atomic layer deposition of metastable β-Fe2O3 via isomorphic epitaxy for photoassisted water oxidation",

abstract = "We report the growth and photoelectrochemical (PEC) characterization of the uncommon bibyite phase of iron(III) oxide (β-Fe2O3) epitaxially stabilized via atomic layer deposition on an conductive, transparent, and isomorphic template (Sn-doped In2O3). As a photoanode, unoptimized β-Fe2O3 ultrathin films perform similarly to their ubiquitous α-phase (hematite) counterpart, but reveal a more ideal bandgap (1.8 eV), a ∼0.1 V improved photocurrent onset potential, and longer wavelength (>600 nm) spectral response. Stable operation under basic water oxidation justifies further exploration of this atypical phase and motivates the investigation of other unexplored metastable phases as new PEC materials.",

keywords = "PEC water oxidation, atomic layer deposition, epitaxial stabilization, iron(III) oxide, α-FeO, β-FeO",

author = "Emery, {Jonathan Daniel} and Schlep{\"u}tz, {Christian M.} and Peijun Guo and Riha, {Shannon C.} and Chang, {R P H} and Martinson, {Alex B.F.}",

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AU - Emery, Jonathan Daniel

AU - Schlepütz, Christian M.

AU - Guo, Peijun

AU - Riha, Shannon C.

AU - Chang, R P H

AU - Martinson, Alex B.F.

PY - 2014/12/24

Y1 - 2014/12/24

N2 - We report the growth and photoelectrochemical (PEC) characterization of the uncommon bibyite phase of iron(III) oxide (β-Fe2O3) epitaxially stabilized via atomic layer deposition on an conductive, transparent, and isomorphic template (Sn-doped In2O3). As a photoanode, unoptimized β-Fe2O3 ultrathin films perform similarly to their ubiquitous α-phase (hematite) counterpart, but reveal a more ideal bandgap (1.8 eV), a ∼0.1 V improved photocurrent onset potential, and longer wavelength (>600 nm) spectral response. Stable operation under basic water oxidation justifies further exploration of this atypical phase and motivates the investigation of other unexplored metastable phases as new PEC materials.

AB - We report the growth and photoelectrochemical (PEC) characterization of the uncommon bibyite phase of iron(III) oxide (β-Fe2O3) epitaxially stabilized via atomic layer deposition on an conductive, transparent, and isomorphic template (Sn-doped In2O3). As a photoanode, unoptimized β-Fe2O3 ultrathin films perform similarly to their ubiquitous α-phase (hematite) counterpart, but reveal a more ideal bandgap (1.8 eV), a ∼0.1 V improved photocurrent onset potential, and longer wavelength (>600 nm) spectral response. Stable operation under basic water oxidation justifies further exploration of this atypical phase and motivates the investigation of other unexplored metastable phases as new PEC materials.

KW - PEC water oxidation

KW - atomic layer deposition

KW - epitaxial stabilization

KW - iron(III) oxide

KW - α-FeO

KW - β-FeO

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