A novel strategy for surface treatment on hematite photoanode for efficient water oxidation

Lifei Xi; Sing Yang Chiam; Wai Fatt Mak; Phong D. Tran; James Barber; Say Chye Joachim Loo; Lydia Helena Wong

doi:10.1039/c2sc20881d

A novel strategy for surface treatment on hematite photoanode for efficient water oxidation

Lifei Xi, Sing Yang Chiam, Wai Fatt Mak, Phong D. Tran, James Barber^*, Say Chye Joachim Loo, Lydia Helena Wong

^*Corresponding author for this work

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

146 Citations (Scopus)

Abstract

In this paper, we report a novel strategy for surface treatment of hematite nanorods for efficient photo-driven water oxidation. This is the first report describing the growth of Sn treated hematite from α-FeOOH nanorod arrays in one step without substantially altering morphologies. With this treatment the photocurrent density increased from 1.24 for pristine hematite nanorods to 2.25 mA cm^-2 at 1.23 V vs. RHE (i.e. 81% improvement). The increase in photocurrent density was also accompanied by improved incident-photon-to-current efficiencies and oxygen evolution. The photocurrent improvement is mainly attributed to a reduced electron-hole recombination at the hematite-electrolyte interface through the formation of Fe_xSn_1-xO₄ layer at the hematite nanorod surface as shown by XPS, HRTEM, EDAX line scan analyses and PEC measurements.

Original language	English
Pages (from-to)	164-169
Number of pages	6
Journal	Chemical Science
Volume	4
Issue number	1
DOIs	https://doi.org/10.1039/c2sc20881d
Publication status	Published - 2013
Externally published	Yes

ASJC Scopus Subject Areas

General Chemistry

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title = "A novel strategy for surface treatment on hematite photoanode for efficient water oxidation",

abstract = "In this paper, we report a novel strategy for surface treatment of hematite nanorods for efficient photo-driven water oxidation. This is the first report describing the growth of Sn treated hematite from α-FeOOH nanorod arrays in one step without substantially altering morphologies. With this treatment the photocurrent density increased from 1.24 for pristine hematite nanorods to 2.25 mA cm-2 at 1.23 V vs. RHE (i.e. 81% improvement). The increase in photocurrent density was also accompanied by improved incident-photon-to-current efficiencies and oxygen evolution. The photocurrent improvement is mainly attributed to a reduced electron-hole recombination at the hematite-electrolyte interface through the formation of FexSn1-xO4 layer at the hematite nanorod surface as shown by XPS, HRTEM, EDAX line scan analyses and PEC measurements.",

author = "Lifei Xi and Chiam, {Sing Yang} and Mak, {Wai Fatt} and Tran, {Phong D.} and James Barber and Loo, {Say Chye Joachim} and Wong, {Lydia Helena}",

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T1 - A novel strategy for surface treatment on hematite photoanode for efficient water oxidation

AU - Xi, Lifei

AU - Chiam, Sing Yang

AU - Mak, Wai Fatt

AU - Tran, Phong D.

AU - Barber, James

AU - Loo, Say Chye Joachim

AU - Wong, Lydia Helena

PY - 2013

Y1 - 2013

N2 - In this paper, we report a novel strategy for surface treatment of hematite nanorods for efficient photo-driven water oxidation. This is the first report describing the growth of Sn treated hematite from α-FeOOH nanorod arrays in one step without substantially altering morphologies. With this treatment the photocurrent density increased from 1.24 for pristine hematite nanorods to 2.25 mA cm-2 at 1.23 V vs. RHE (i.e. 81% improvement). The increase in photocurrent density was also accompanied by improved incident-photon-to-current efficiencies and oxygen evolution. The photocurrent improvement is mainly attributed to a reduced electron-hole recombination at the hematite-electrolyte interface through the formation of FexSn1-xO4 layer at the hematite nanorod surface as shown by XPS, HRTEM, EDAX line scan analyses and PEC measurements.

AB - In this paper, we report a novel strategy for surface treatment of hematite nanorods for efficient photo-driven water oxidation. This is the first report describing the growth of Sn treated hematite from α-FeOOH nanorod arrays in one step without substantially altering morphologies. With this treatment the photocurrent density increased from 1.24 for pristine hematite nanorods to 2.25 mA cm-2 at 1.23 V vs. RHE (i.e. 81% improvement). The increase in photocurrent density was also accompanied by improved incident-photon-to-current efficiencies and oxygen evolution. The photocurrent improvement is mainly attributed to a reduced electron-hole recombination at the hematite-electrolyte interface through the formation of FexSn1-xO4 layer at the hematite nanorod surface as shown by XPS, HRTEM, EDAX line scan analyses and PEC measurements.

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A novel strategy for surface treatment on hematite photoanode for efficient water oxidation

Abstract

ASJC Scopus Subject Areas

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