Sn self-doped α-Fe2O3 nanobranch arrays supported on a transparent, conductive SnO2 trunk to improve photoelectrochemical water oxidation

Sangbaek Park; Hae Jin Kim; Chan Woo Lee; Hee Jo Song; Seong Sik Shin; Se Won Seo; Hoon Kee Park; Sungjun Lee; Dong Wan Kim; Kug Sun Hong

doi:10.1016/j.ijhydene.2014.02.165

Sn self-doped α-Fe₂O₃ nanobranch arrays supported on a transparent, conductive SnO₂ trunk to improve photoelectrochemical water oxidation

Sangbaek Park, Hae Jin Kim, Chan Woo Lee, Hee Jo Song, Seong Sik Shin, Se Won Seo, Hoon Kee Park, Sungjun Lee, Dong Wan Kim, Kug Sun Hong

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

35 Citations (Scopus)

Abstract

We produced hierarchically branched Fe₂O₃ nanorods on a Sb:SnO₂ transparent conducting oxide (TCO) nanobelt structure as photoanodes for photoelectrochemical water splitting. Single-crystalline SnO₂ nanobelts (NBs) surrounded by Fe₂O₃ nanorods (NRs) were synthesized by thermal evaporation, then underwent chemical bath deposition and annealing. When Fe₂O₃ was crystallized by annealing, Sn was diffused from SnO₂ NBs and incorporated to Fe₂O₃ NRs, which was confirmed through Energy dispersive spectroscopy. Unlike previous high temperature sintering (∼800 °C), Sn doped hematite NRs were obtained at a low temperature (∼650 °C). This occurred since SnO₂ NBs directly connected to Fe₂O₃ NRs are an abundant source of Sn dopant. The 3D hematite NRs on SnO₂ NBs annealed at 650 °C produce a photocurrent density of 0.88 mA/cm² at 1.23 V vs. RHE, which is 3 times higher than that of hematite NRs on a fluorine doped tin oxide (FTO) glass substrate annealed at the same temperature. The enhanced photocurrent is attributed to the improved electrical conductivity of Fe₂O₃ NRs by Sn doping, the efficient electron transport pathway by TCO nanowire and the increased surface area by hierarchically branched structure.

Original language	English
Pages (from-to)	16459-16467
Number of pages	9
Journal	International Journal of Hydrogen Energy
Volume	39
Issue number	29
DOIs	https://doi.org/10.1016/j.ijhydene.2014.02.165
Publication status	Published - 2014 Oct 2

Bibliographical note

Publisher Copyright:
© 2014 Hydrogen Energy Publications, LLC.

Keywords

3D structure
Doping
Hematite
Photoelectrochemical
Transparent conducting oxide

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

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

Access to Document

10.1016/j.ijhydene.2014.02.165

Cite this

Park, S., Kim, H. J., Lee, C. W., Song, H. J., Shin, S. S., Seo, S. W., Park, H. K., Lee, S., Kim, D. W., & Hong, K. S. (2014). Sn self-doped α-Fe₂O₃ nanobranch arrays supported on a transparent, conductive SnO₂ trunk to improve photoelectrochemical water oxidation. International Journal of Hydrogen Energy, 39(29), 16459-16467. https://doi.org/10.1016/j.ijhydene.2014.02.165

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abstract = "We produced hierarchically branched Fe2O3 nanorods on a Sb:SnO2 transparent conducting oxide (TCO) nanobelt structure as photoanodes for photoelectrochemical water splitting. Single-crystalline SnO2 nanobelts (NBs) surrounded by Fe2O3 nanorods (NRs) were synthesized by thermal evaporation, then underwent chemical bath deposition and annealing. When Fe2O3 was crystallized by annealing, Sn was diffused from SnO2 NBs and incorporated to Fe2O3 NRs, which was confirmed through Energy dispersive spectroscopy. Unlike previous high temperature sintering (∼800 °C), Sn doped hematite NRs were obtained at a low temperature (∼650 °C). This occurred since SnO2 NBs directly connected to Fe2O3 NRs are an abundant source of Sn dopant. The 3D hematite NRs on SnO2 NBs annealed at 650 °C produce a photocurrent density of 0.88 mA/cm2 at 1.23 V vs. RHE, which is 3 times higher than that of hematite NRs on a fluorine doped tin oxide (FTO) glass substrate annealed at the same temperature. The enhanced photocurrent is attributed to the improved electrical conductivity of Fe2O3 NRs by Sn doping, the efficient electron transport pathway by TCO nanowire and the increased surface area by hierarchically branched structure.",

keywords = "3D structure, Doping, Hematite, Photoelectrochemical, Transparent conducting oxide",

author = "Sangbaek Park and Kim, {Hae Jin} and Lee, {Chan Woo} and Song, {Hee Jo} and Shin, {Seong Sik} and Seo, {Se Won} and Park, {Hoon Kee} and Sungjun Lee and Kim, {Dong Wan} and Hong, {Kug Sun}",

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AU - Park, Sangbaek

AU - Kim, Hae Jin

AU - Lee, Chan Woo

AU - Song, Hee Jo

AU - Shin, Seong Sik

AU - Seo, Se Won

AU - Park, Hoon Kee

AU - Lee, Sungjun

AU - Kim, Dong Wan

AU - Hong, Kug Sun

PY - 2014/10/2

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AB - We produced hierarchically branched Fe2O3 nanorods on a Sb:SnO2 transparent conducting oxide (TCO) nanobelt structure as photoanodes for photoelectrochemical water splitting. Single-crystalline SnO2 nanobelts (NBs) surrounded by Fe2O3 nanorods (NRs) were synthesized by thermal evaporation, then underwent chemical bath deposition and annealing. When Fe2O3 was crystallized by annealing, Sn was diffused from SnO2 NBs and incorporated to Fe2O3 NRs, which was confirmed through Energy dispersive spectroscopy. Unlike previous high temperature sintering (∼800 °C), Sn doped hematite NRs were obtained at a low temperature (∼650 °C). This occurred since SnO2 NBs directly connected to Fe2O3 NRs are an abundant source of Sn dopant. The 3D hematite NRs on SnO2 NBs annealed at 650 °C produce a photocurrent density of 0.88 mA/cm2 at 1.23 V vs. RHE, which is 3 times higher than that of hematite NRs on a fluorine doped tin oxide (FTO) glass substrate annealed at the same temperature. The enhanced photocurrent is attributed to the improved electrical conductivity of Fe2O3 NRs by Sn doping, the efficient electron transport pathway by TCO nanowire and the increased surface area by hierarchically branched structure.

KW - 3D structure

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