Improving the efficiency of hematite nanorods for photoelectrochemical water splitting by doping with manganese

G. Gurudayal; Sing Yang Chiam; Mulmudi Hemant Kumar; Prince Saurabh Bassi; Hwee Leng Seng; James Barber; Lydia Helena Wong

doi:10.1021/am500643y

Improving the efficiency of hematite nanorods for photoelectrochemical water splitting by doping with manganese

G. Gurudayal, Sing Yang Chiam, Mulmudi Hemant Kumar, Prince Saurabh Bassi, Hwee Leng Seng, James Barber^*, Lydia Helena Wong

^*Corresponding author for this work

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

181 Citations (Scopus)

Abstract

Here, we report a significant improvement of the photoelectrochemical (PEC) properties of hematite (α-Fe₂O₃) to oxidize water by doping with manganese. Hematite nanorods were grown on a fluorine-treated tin oxide (FTO) substrate by a hydrothermal method in the presence on Mn. Systematic physical analyses were performed to investigate the presence of Mn in the samples. Fe₂O₃ nanorods with 5 mol % Mn treatment showed a photocurrent density of 1.6 mA cm^-2 (75% higher than that of pristine Fe₂O₃) at 1.23 V versus RHE and a plateau photocurrent density of 3.2 mA cm^-2 at 1.8 V versus RHE in a 1 M NaOH electrolyte solution (pH 13.6). We attribute the increase in the photocurrent density, and thus in the oxygen evolving capacity, to the increased donor density resulting from Mn doping of the Fe₂O₃ nanorods, as confirmed by Mott-Schottky measurement, as well as the suppression of electron-hole recombination and enhancement in hole transport, as detected by chronoamperometry measurements.

Original language	English
Pages (from-to)	5852-5859
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	6
Issue number	8
DOIs	https://doi.org/10.1021/am500643y
Publication status	Published - Apr 23 2014
Externally published	Yes

ASJC Scopus Subject Areas

General Materials Science

Keywords

artificial photosynthesis
hematite
Mott-Schottky
photoelectrochemistry
water splitting

UN SDGs

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

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10.1021/am500643y

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abstract = "Here, we report a significant improvement of the photoelectrochemical (PEC) properties of hematite (α-Fe2O3) to oxidize water by doping with manganese. Hematite nanorods were grown on a fluorine-treated tin oxide (FTO) substrate by a hydrothermal method in the presence on Mn. Systematic physical analyses were performed to investigate the presence of Mn in the samples. Fe2O3 nanorods with 5 mol % Mn treatment showed a photocurrent density of 1.6 mA cm-2 (75% higher than that of pristine Fe2O3) at 1.23 V versus RHE and a plateau photocurrent density of 3.2 mA cm-2 at 1.8 V versus RHE in a 1 M NaOH electrolyte solution (pH 13.6). We attribute the increase in the photocurrent density, and thus in the oxygen evolving capacity, to the increased donor density resulting from Mn doping of the Fe2O3 nanorods, as confirmed by Mott-Schottky measurement, as well as the suppression of electron-hole recombination and enhancement in hole transport, as detected by chronoamperometry measurements.",

keywords = "artificial photosynthesis, hematite, Mott-Schottky, photoelectrochemistry, water splitting",

author = "G. Gurudayal and Chiam, {Sing Yang} and Kumar, {Mulmudi Hemant} and Bassi, {Prince Saurabh} and Seng, {Hwee Leng} and James Barber and Wong, {Lydia Helena}",

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AU - Gurudayal, G.

AU - Chiam, Sing Yang

AU - Kumar, Mulmudi Hemant

AU - Bassi, Prince Saurabh

AU - Seng, Hwee Leng

AU - Barber, James

AU - Wong, Lydia Helena

PY - 2014/4/23

Y1 - 2014/4/23

N2 - Here, we report a significant improvement of the photoelectrochemical (PEC) properties of hematite (α-Fe2O3) to oxidize water by doping with manganese. Hematite nanorods were grown on a fluorine-treated tin oxide (FTO) substrate by a hydrothermal method in the presence on Mn. Systematic physical analyses were performed to investigate the presence of Mn in the samples. Fe2O3 nanorods with 5 mol % Mn treatment showed a photocurrent density of 1.6 mA cm-2 (75% higher than that of pristine Fe2O3) at 1.23 V versus RHE and a plateau photocurrent density of 3.2 mA cm-2 at 1.8 V versus RHE in a 1 M NaOH electrolyte solution (pH 13.6). We attribute the increase in the photocurrent density, and thus in the oxygen evolving capacity, to the increased donor density resulting from Mn doping of the Fe2O3 nanorods, as confirmed by Mott-Schottky measurement, as well as the suppression of electron-hole recombination and enhancement in hole transport, as detected by chronoamperometry measurements.

AB - Here, we report a significant improvement of the photoelectrochemical (PEC) properties of hematite (α-Fe2O3) to oxidize water by doping with manganese. Hematite nanorods were grown on a fluorine-treated tin oxide (FTO) substrate by a hydrothermal method in the presence on Mn. Systematic physical analyses were performed to investigate the presence of Mn in the samples. Fe2O3 nanorods with 5 mol % Mn treatment showed a photocurrent density of 1.6 mA cm-2 (75% higher than that of pristine Fe2O3) at 1.23 V versus RHE and a plateau photocurrent density of 3.2 mA cm-2 at 1.8 V versus RHE in a 1 M NaOH electrolyte solution (pH 13.6). We attribute the increase in the photocurrent density, and thus in the oxygen evolving capacity, to the increased donor density resulting from Mn doping of the Fe2O3 nanorods, as confirmed by Mott-Schottky measurement, as well as the suppression of electron-hole recombination and enhancement in hole transport, as detected by chronoamperometry measurements.

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KW - photoelectrochemistry

KW - water splitting

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Improving the efficiency of hematite nanorods for photoelectrochemical water splitting by doping with manganese

Abstract

ASJC Scopus Subject Areas

Keywords

UN SDGs

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