Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

Shaohua Shen; Coleman X. Kronawitter; Damon A. Wheeler; Penghui Guo; Sarah A. Lindley; Jiangang Jiang; Jin Z. Zhang; Liejin Guo; Samuel S. Mao

doi:10.1039/c3ta13453a

Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

Shaohua Shen, Coleman X. Kronawitter, Damon A. Wheeler, Penghui Guo, Sarah A. Lindley, Jiangang Jiang, Jin Z. Zhang, Liejin Guo, Samuel S. Mao

Mechanical & Nuclear Engineering

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

87 Scopus citations

Abstract

We present the fabrication and characterization of Ti-doped hematite (α-Fe₂O₃) films for application as photoanodes in photoelectrochemical (PEC) cells for water splitting. It is demonstrated that Ti doping significantly improves the PEC activity as the photocurrent at 1.0 V vs. Ag/AgCl electrode for a 400 nm thick Ti-doped film (0.66 mA cm^-2) was found to be ∼14 times higher than that of an undoped film (0.045 mA cm^-2). The films were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultrafast transient absorption spectroscopy to obtain information about their structural, electronic, and charge carrier dynamic properties. Based on characterization of the chemical states of the involved elements as well as the charge carrier dynamics of the films with Ti doping, it appears that the photocurrent enhancement is related to an increase in charge carrier density or reduced electron-hole recombination. The highest incident photon conversion efficiency (IPCE) measured for this system was 27.0% at 360 nm at a potential of 1.23 V vs. reversible hydrogen electrode (RHE), which was obtained on a 400 nm thick Ti-doped α-Fe₂O₃ film.

Original language	British English
Pages (from-to)	14498-14506
Number of pages	9
Journal	Journal of Materials Chemistry A
Volume	1
Issue number	46
DOIs	https://doi.org/10.1039/c3ta13453a
State	Published - 14 Dec 2013

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@article{eb9a7c7e2e9945a5805800cc17507097,

title = "Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth",

abstract = "We present the fabrication and characterization of Ti-doped hematite (α-Fe2O3) films for application as photoanodes in photoelectrochemical (PEC) cells for water splitting. It is demonstrated that Ti doping significantly improves the PEC activity as the photocurrent at 1.0 V vs. Ag/AgCl electrode for a 400 nm thick Ti-doped film (0.66 mA cm-2) was found to be ∼14 times higher than that of an undoped film (0.045 mA cm-2). The films were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultrafast transient absorption spectroscopy to obtain information about their structural, electronic, and charge carrier dynamic properties. Based on characterization of the chemical states of the involved elements as well as the charge carrier dynamics of the films with Ti doping, it appears that the photocurrent enhancement is related to an increase in charge carrier density or reduced electron-hole recombination. The highest incident photon conversion efficiency (IPCE) measured for this system was 27.0% at 360 nm at a potential of 1.23 V vs. reversible hydrogen electrode (RHE), which was obtained on a 400 nm thick Ti-doped α-Fe2O3 film.",

author = "Shaohua Shen and Kronawitter, {Coleman X.} and Wheeler, {Damon A.} and Penghui Guo and Lindley, {Sarah A.} and Jiangang Jiang and Zhang, {Jin Z.} and Liejin Guo and Mao, {Samuel S.}",

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doi = "10.1039/c3ta13453a",

language = "British English",

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T1 - Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

AU - Shen, Shaohua

AU - Kronawitter, Coleman X.

AU - Wheeler, Damon A.

AU - Guo, Penghui

AU - Lindley, Sarah A.

AU - Jiang, Jiangang

AU - Zhang, Jin Z.

AU - Guo, Liejin

AU - Mao, Samuel S.

PY - 2013/12/14

Y1 - 2013/12/14

N2 - We present the fabrication and characterization of Ti-doped hematite (α-Fe2O3) films for application as photoanodes in photoelectrochemical (PEC) cells for water splitting. It is demonstrated that Ti doping significantly improves the PEC activity as the photocurrent at 1.0 V vs. Ag/AgCl electrode for a 400 nm thick Ti-doped film (0.66 mA cm-2) was found to be ∼14 times higher than that of an undoped film (0.045 mA cm-2). The films were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultrafast transient absorption spectroscopy to obtain information about their structural, electronic, and charge carrier dynamic properties. Based on characterization of the chemical states of the involved elements as well as the charge carrier dynamics of the films with Ti doping, it appears that the photocurrent enhancement is related to an increase in charge carrier density or reduced electron-hole recombination. The highest incident photon conversion efficiency (IPCE) measured for this system was 27.0% at 360 nm at a potential of 1.23 V vs. reversible hydrogen electrode (RHE), which was obtained on a 400 nm thick Ti-doped α-Fe2O3 film.

AB - We present the fabrication and characterization of Ti-doped hematite (α-Fe2O3) films for application as photoanodes in photoelectrochemical (PEC) cells for water splitting. It is demonstrated that Ti doping significantly improves the PEC activity as the photocurrent at 1.0 V vs. Ag/AgCl electrode for a 400 nm thick Ti-doped film (0.66 mA cm-2) was found to be ∼14 times higher than that of an undoped film (0.045 mA cm-2). The films were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultrafast transient absorption spectroscopy to obtain information about their structural, electronic, and charge carrier dynamic properties. Based on characterization of the chemical states of the involved elements as well as the charge carrier dynamics of the films with Ti doping, it appears that the photocurrent enhancement is related to an increase in charge carrier density or reduced electron-hole recombination. The highest incident photon conversion efficiency (IPCE) measured for this system was 27.0% at 360 nm at a potential of 1.23 V vs. reversible hydrogen electrode (RHE), which was obtained on a 400 nm thick Ti-doped α-Fe2O3 film.

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JO - Journal of Materials Chemistry A

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Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

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