Self-Assembled Heteroepitaxial Oxide Nanocomposite for Photoelectrochemical Solar Water Oxidation

Seungho Cho; Ji Wook Jang; Leigang Li; Jie Jian; Haiyan Wang; Judith L. Macmanus-Driscoll

doi:10.1021/acs.chemmater.6b00122

Self-Assembled Heteroepitaxial Oxide Nanocomposite for Photoelectrochemical Solar Water Oxidation

Seungho Cho
, Ji Wook Jang
, Leigang Li
, Jie Jian
, Haiyan Wang
, Judith L. Macmanus-Driscoll^*

^*Corresponding author for this work

University of Cambridge
Helmholtz Centre Berlin for Materials and Energy
Texas A&M University

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

33 Scopus citations

Abstract

We report on spontaneously phase ordered heteroepitaxial SrTiO₃ (STO):ZnFe₂O₄ (ZFO) nanocomposite films that give rise to strongly enhanced photoelectrochemical solar water oxidation, consistent with enhanced photoinduced charge separation. The STO:ZFO nanocomposite yielded an enhanced photocurrent density of 0.188 mA/cm² at 1.23 V vs a reversible hydrogen electrode, which was 7.9- and 2.6-fold higher than that of the plain STO film and ZFO film cases under 1-sun illumination, respectively. The photoelectrode also produced stable photocurrent and Faradaic efficiencies of H₂ and O₂ formation that were more than 90%. Incident-photon-to-current-conversion efficiency measurements, Tauc plots, Mott-Schottky plots, and electrochemical impedance spectroscopy measurements proved that the strongly enhanced photogenerated charge separation resulted from vertically aligned pseudosingle crystalline components, epitaxial heterojunctions, and a staggered band alignment of the components of the nanocomposite films. This study presents a completely new avenue for efficient solar energy conversion applications.

Original language	English
Pages (from-to)	3017-3023
Number of pages	7
Journal	Chemistry of Materials
Volume	28
Issue number	9
DOIs	https://doi.org/10.1021/acs.chemmater.6b00122
State	Published - 10 May 2016
Externally published	Yes

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@article{d5304295d175432b811c522dd81813ae,

title = "Self-Assembled Heteroepitaxial Oxide Nanocomposite for Photoelectrochemical Solar Water Oxidation",

abstract = "We report on spontaneously phase ordered heteroepitaxial SrTiO3 (STO):ZnFe2O4 (ZFO) nanocomposite films that give rise to strongly enhanced photoelectrochemical solar water oxidation, consistent with enhanced photoinduced charge separation. The STO:ZFO nanocomposite yielded an enhanced photocurrent density of 0.188 mA/cm2 at 1.23 V vs a reversible hydrogen electrode, which was 7.9- and 2.6-fold higher than that of the plain STO film and ZFO film cases under 1-sun illumination, respectively. The photoelectrode also produced stable photocurrent and Faradaic efficiencies of H2 and O2 formation that were more than 90\%. Incident-photon-to-current-conversion efficiency measurements, Tauc plots, Mott-Schottky plots, and electrochemical impedance spectroscopy measurements proved that the strongly enhanced photogenerated charge separation resulted from vertically aligned pseudosingle crystalline components, epitaxial heterojunctions, and a staggered band alignment of the components of the nanocomposite films. This study presents a completely new avenue for efficient solar energy conversion applications.",

author = "Seungho Cho and Jang, \{Ji Wook\} and Leigang Li and Jie Jian and Haiyan Wang and Macmanus-Driscoll, \{Judith L.\}",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

month = may,

day = "10",

doi = "10.1021/acs.chemmater.6b00122",

language = "英语",

volume = "28",

pages = "3017--3023",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

number = "9",

}

TY - JOUR

T1 - Self-Assembled Heteroepitaxial Oxide Nanocomposite for Photoelectrochemical Solar Water Oxidation

AU - Cho, Seungho

AU - Jang, Ji Wook

AU - Li, Leigang

AU - Jian, Jie

AU - Wang, Haiyan

AU - Macmanus-Driscoll, Judith L.

PY - 2016/5/10

Y1 - 2016/5/10

N2 - We report on spontaneously phase ordered heteroepitaxial SrTiO3 (STO):ZnFe2O4 (ZFO) nanocomposite films that give rise to strongly enhanced photoelectrochemical solar water oxidation, consistent with enhanced photoinduced charge separation. The STO:ZFO nanocomposite yielded an enhanced photocurrent density of 0.188 mA/cm2 at 1.23 V vs a reversible hydrogen electrode, which was 7.9- and 2.6-fold higher than that of the plain STO film and ZFO film cases under 1-sun illumination, respectively. The photoelectrode also produced stable photocurrent and Faradaic efficiencies of H2 and O2 formation that were more than 90%. Incident-photon-to-current-conversion efficiency measurements, Tauc plots, Mott-Schottky plots, and electrochemical impedance spectroscopy measurements proved that the strongly enhanced photogenerated charge separation resulted from vertically aligned pseudosingle crystalline components, epitaxial heterojunctions, and a staggered band alignment of the components of the nanocomposite films. This study presents a completely new avenue for efficient solar energy conversion applications.

AB - We report on spontaneously phase ordered heteroepitaxial SrTiO3 (STO):ZnFe2O4 (ZFO) nanocomposite films that give rise to strongly enhanced photoelectrochemical solar water oxidation, consistent with enhanced photoinduced charge separation. The STO:ZFO nanocomposite yielded an enhanced photocurrent density of 0.188 mA/cm2 at 1.23 V vs a reversible hydrogen electrode, which was 7.9- and 2.6-fold higher than that of the plain STO film and ZFO film cases under 1-sun illumination, respectively. The photoelectrode also produced stable photocurrent and Faradaic efficiencies of H2 and O2 formation that were more than 90%. Incident-photon-to-current-conversion efficiency measurements, Tauc plots, Mott-Schottky plots, and electrochemical impedance spectroscopy measurements proved that the strongly enhanced photogenerated charge separation resulted from vertically aligned pseudosingle crystalline components, epitaxial heterojunctions, and a staggered band alignment of the components of the nanocomposite films. This study presents a completely new avenue for efficient solar energy conversion applications.

UR - https://www.scopus.com/pages/publications/84969626634

U2 - 10.1021/acs.chemmater.6b00122

DO - 10.1021/acs.chemmater.6b00122

M3 - 文章

AN - SCOPUS:84969626634

SN - 0897-4756

VL - 28

SP - 3017

EP - 3023

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 9

ER -

Self-Assembled Heteroepitaxial Oxide Nanocomposite for Photoelectrochemical Solar Water Oxidation

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