Crystalline Fe2O3/Fe2TiO5 heterojunction nanorods with efficient charge separation and hole injection as photoanode for solar water oxidation

Prince Saurabh Bassi; Rajini P. Antony; Pablo P. Boix; Yanan Fang; James Barber; Lydia Helena Wong

doi:10.1016/j.nanoen.2016.02.013

Crystalline Fe₂O₃/Fe₂TiO₅ heterojunction nanorods with efficient charge separation and hole injection as photoanode for solar water oxidation

Prince Saurabh Bassi, Rajini P. Antony, Pablo P. Boix, Yanan Fang, James Barber, Lydia Helena Wong^*

^*Corresponding author for this work

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

115 Citations (Scopus)

Abstract

We have constructed a Fe₂O₃/Fe₂TiO₅ heterojunction based photoanode deposited on Fluorine Doped Tin Oxide (FTO) substrate by initially fabricating hematite (Fe₂O₃) nanorods and subsequently pseudobrookite (Fe₂TiO₅) nanoporous thin film on top of them. Comparatively lower annealing temperature of 650 °C (usually 750 °C or above) was used to avoid degradation of FTO. The crystalline Fe₂O₃/Fe₂TiO₅ heterojunction shows a considerable enhancement in photocurrent density ca. 1.4 mA/cm² and high surface charge separation efficiency of 85% at operating voltage of 1.23 V vs RHE as compared to its constituents. The crystalline heterojunction showed overall improvement in performance due to enhanced charge separation owing to the favorable band alignment with Fe₂O₃ nanorods and efficient injection of photogenerated holes through surface states into the electrolyte observed through Electrochemical Impedance Spectroscopy.

Original language	English
Pages (from-to)	310-318
Number of pages	9
Journal	Nano Energy
Volume	22
DOIs	https://doi.org/10.1016/j.nanoen.2016.02.013
Publication status	Published - Apr 1 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016 .

ASJC Scopus Subject Areas

Renewable Energy, Sustainability and the Environment
General Materials Science
Electrical and Electronic Engineering

Keywords

Band alignment
Hematite
Impedance spectroscopy
Photoelectrochemical cell
Pseudobrookite
Water splitting

UN SDGs

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

Access to Document

10.1016/j.nanoen.2016.02.013

Cite this

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title = "Crystalline Fe2O3/Fe2TiO5 heterojunction nanorods with efficient charge separation and hole injection as photoanode for solar water oxidation",

abstract = "We have constructed a Fe2O3/Fe2TiO5 heterojunction based photoanode deposited on Fluorine Doped Tin Oxide (FTO) substrate by initially fabricating hematite (Fe2O3) nanorods and subsequently pseudobrookite (Fe2TiO5) nanoporous thin film on top of them. Comparatively lower annealing temperature of 650 °C (usually 750 °C or above) was used to avoid degradation of FTO. The crystalline Fe2O3/Fe2TiO5 heterojunction shows a considerable enhancement in photocurrent density ca. 1.4 mA/cm2 and high surface charge separation efficiency of 85% at operating voltage of 1.23 V vs RHE as compared to its constituents. The crystalline heterojunction showed overall improvement in performance due to enhanced charge separation owing to the favorable band alignment with Fe2O3 nanorods and efficient injection of photogenerated holes through surface states into the electrolyte observed through Electrochemical Impedance Spectroscopy.",

keywords = "Band alignment, Hematite, Impedance spectroscopy, Photoelectrochemical cell, Pseudobrookite, Water splitting",

author = "Bassi, {Prince Saurabh} and Antony, {Rajini P.} and Boix, {Pablo P.} and Yanan Fang and James Barber and Wong, {Lydia Helena}",

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

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T1 - Crystalline Fe2O3/Fe2TiO5 heterojunction nanorods with efficient charge separation and hole injection as photoanode for solar water oxidation

AU - Bassi, Prince Saurabh

AU - Antony, Rajini P.

AU - Boix, Pablo P.

AU - Fang, Yanan

AU - Barber, James

AU - Wong, Lydia Helena

PY - 2016/4/1

Y1 - 2016/4/1

N2 - We have constructed a Fe2O3/Fe2TiO5 heterojunction based photoanode deposited on Fluorine Doped Tin Oxide (FTO) substrate by initially fabricating hematite (Fe2O3) nanorods and subsequently pseudobrookite (Fe2TiO5) nanoporous thin film on top of them. Comparatively lower annealing temperature of 650 °C (usually 750 °C or above) was used to avoid degradation of FTO. The crystalline Fe2O3/Fe2TiO5 heterojunction shows a considerable enhancement in photocurrent density ca. 1.4 mA/cm2 and high surface charge separation efficiency of 85% at operating voltage of 1.23 V vs RHE as compared to its constituents. The crystalline heterojunction showed overall improvement in performance due to enhanced charge separation owing to the favorable band alignment with Fe2O3 nanorods and efficient injection of photogenerated holes through surface states into the electrolyte observed through Electrochemical Impedance Spectroscopy.

AB - We have constructed a Fe2O3/Fe2TiO5 heterojunction based photoanode deposited on Fluorine Doped Tin Oxide (FTO) substrate by initially fabricating hematite (Fe2O3) nanorods and subsequently pseudobrookite (Fe2TiO5) nanoporous thin film on top of them. Comparatively lower annealing temperature of 650 °C (usually 750 °C or above) was used to avoid degradation of FTO. The crystalline Fe2O3/Fe2TiO5 heterojunction shows a considerable enhancement in photocurrent density ca. 1.4 mA/cm2 and high surface charge separation efficiency of 85% at operating voltage of 1.23 V vs RHE as compared to its constituents. The crystalline heterojunction showed overall improvement in performance due to enhanced charge separation owing to the favorable band alignment with Fe2O3 nanorods and efficient injection of photogenerated holes through surface states into the electrolyte observed through Electrochemical Impedance Spectroscopy.

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KW - Hematite

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KW - Water splitting

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