Hierarchical TiO                         2                         @In                         2                         O                         3                          heteroarchitecture photoanodes: Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition

Gil Woo An; Mahadeo A. Mahadik; Guangxia Piao; Weon Sik Chae; Hyunwoong Park; Min Cho; Hee Suk Chung; Jum Suk Jang

doi:10.1016/j.apsusc.2019.02.196

Hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoanodes: Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition

Gil Woo An, Mahadeo A. Mahadik, Guangxia Piao, Weon Sik Chae, Hyunwoong Park, Min Cho, Hee Suk Chung, Jum Suk Jang

School of Energy Engineering

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

39 Scopus citations

Abstract

In this study, we have synthesized hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoanodes via a hydrothermal method and studied their interfacial charge carrier dynamics through water splitting and organic decomposition. Photoelectrochemical measurements show that the IN-0.4 exhibits an obvious enhancement in photocurrent density compared to the pristine TiO ₂ . Electrochemical impendence spectroscopy (EIS) and Time-resolved photoluminescence (PL) have been employed to study the charge recombination in TiO ₂ @In ₂ O ₃ nanostructure. The surface passivation of TiO ₂ nanorods (NRs) with In ₂ O ₃ nanostructures helps to the suppression of the surface defects. The surface-passivated photoanode (IN-0.4) has demonstrated the improved hydrogen generation activity (125 μmol∙h ⁻¹ ) of TiO ₂ nanorods (NRs) with In ₂ O ₃ nanostructures during water splitting and organic decomposition. The probable causes of the enhancement in hydrogen evolution could be due to (i) enhanced photogenerated electron transport (ii) increased active surface area with In ₂ O ₃ and/or (iii) catalytic activity of In ₂ O ₃ . Moreover, the photoelectrocatalytic activities of IN-0.4 were slight affect during degradation of Bisphenol A and methyl orange dye, which might be due to the lower hole mobility in TiO ₂ @In ₂ O ₃ heteroarchitecture photoelectrodes. These sightings and proposed schematic model can help to understand the charge transfer dynamics in hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoelectrodes as well as designing multifaceted photoelectrodes for solar energy conversion.

Original language	English
Pages (from-to)	1-12
Number of pages	12
Journal	Applied Surface Science
Volume	480
DOIs	https://doi.org/10.1016/j.apsusc.2019.02.196
State	Published - 30 Jun 2019

Keywords

BPA degradation
Charge transfer mechanism
Photoelectrochemical hydrogen generation
TiO @In O heteroarchitecture photoelectrodes

UN SDGs

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

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10.1016/j.apsusc.2019.02.196

Cite this

An, G. W., Mahadik, M. A., Piao, G., Chae, W. S., Park, H., Cho, M., Chung, H. S., & Jang, J. S. (2019). Hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoanodes: Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition. Applied Surface Science, 480, 1-12. https://doi.org/10.1016/j.apsusc.2019.02.196

An, Gil Woo ; Mahadik, Mahadeo A. ; Piao, Guangxia et al. / Hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoanodes : Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition. In: Applied Surface Science. 2019 ; Vol. 480. pp. 1-12.

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title = "Hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoanodes: Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition",

abstract = " In this study, we have synthesized hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoanodes via a hydrothermal method and studied their interfacial charge carrier dynamics through water splitting and organic decomposition. Photoelectrochemical measurements show that the IN-0.4 exhibits an obvious enhancement in photocurrent density compared to the pristine TiO 2 . Electrochemical impendence spectroscopy (EIS) and Time-resolved photoluminescence (PL) have been employed to study the charge recombination in TiO 2 @In 2 O 3 nanostructure. The surface passivation of TiO 2 nanorods (NRs) with In 2 O 3 nanostructures helps to the suppression of the surface defects. The surface-passivated photoanode (IN-0.4) has demonstrated the improved hydrogen generation activity (125 μmol∙h −1 ) of TiO 2 nanorods (NRs) with In 2 O 3 nanostructures during water splitting and organic decomposition. The probable causes of the enhancement in hydrogen evolution could be due to (i) enhanced photogenerated electron transport (ii) increased active surface area with In 2 O 3 and/or (iii) catalytic activity of In 2 O 3 . Moreover, the photoelectrocatalytic activities of IN-0.4 were slight affect during degradation of Bisphenol A and methyl orange dye, which might be due to the lower hole mobility in TiO 2 @In 2 O 3 heteroarchitecture photoelectrodes. These sightings and proposed schematic model can help to understand the charge transfer dynamics in hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoelectrodes as well as designing multifaceted photoelectrodes for solar energy conversion.",

keywords = "BPA degradation, Charge transfer mechanism, Photoelectrochemical hydrogen generation, TiO @In O heteroarchitecture photoelectrodes",

author = "An, {Gil Woo} and Mahadik, {Mahadeo A.} and Guangxia Piao and Chae, {Weon Sik} and Hyunwoong Park and Min Cho and Chung, {Hee Suk} and Jang, {Jum Suk}",

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year = "2019",

month = jun,

day = "30",

doi = "10.1016/j.apsusc.2019.02.196",

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An, GW, Mahadik, MA, Piao, G, Chae, WS, Park, H, Cho, M, Chung, HS & Jang, JS 2019, 'Hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoanodes: Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition', Applied Surface Science, vol. 480, pp. 1-12. https://doi.org/10.1016/j.apsusc.2019.02.196

Hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoanodes: Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition. / An, Gil Woo; Mahadik, Mahadeo A.; Piao, Guangxia et al.
In: Applied Surface Science, Vol. 480, 30.06.2019, p. 1-12.

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

TY - JOUR

T1 - Hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoanodes

T2 - Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition

AU - An, Gil Woo

AU - Mahadik, Mahadeo A.

AU - Piao, Guangxia

AU - Chae, Weon Sik

AU - Park, Hyunwoong

AU - Cho, Min

AU - Chung, Hee Suk

AU - Jang, Jum Suk

PY - 2019/6/30

Y1 - 2019/6/30

N2 - In this study, we have synthesized hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoanodes via a hydrothermal method and studied their interfacial charge carrier dynamics through water splitting and organic decomposition. Photoelectrochemical measurements show that the IN-0.4 exhibits an obvious enhancement in photocurrent density compared to the pristine TiO 2 . Electrochemical impendence spectroscopy (EIS) and Time-resolved photoluminescence (PL) have been employed to study the charge recombination in TiO 2 @In 2 O 3 nanostructure. The surface passivation of TiO 2 nanorods (NRs) with In 2 O 3 nanostructures helps to the suppression of the surface defects. The surface-passivated photoanode (IN-0.4) has demonstrated the improved hydrogen generation activity (125 μmol∙h −1 ) of TiO 2 nanorods (NRs) with In 2 O 3 nanostructures during water splitting and organic decomposition. The probable causes of the enhancement in hydrogen evolution could be due to (i) enhanced photogenerated electron transport (ii) increased active surface area with In 2 O 3 and/or (iii) catalytic activity of In 2 O 3 . Moreover, the photoelectrocatalytic activities of IN-0.4 were slight affect during degradation of Bisphenol A and methyl orange dye, which might be due to the lower hole mobility in TiO 2 @In 2 O 3 heteroarchitecture photoelectrodes. These sightings and proposed schematic model can help to understand the charge transfer dynamics in hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoelectrodes as well as designing multifaceted photoelectrodes for solar energy conversion.

AB - In this study, we have synthesized hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoanodes via a hydrothermal method and studied their interfacial charge carrier dynamics through water splitting and organic decomposition. Photoelectrochemical measurements show that the IN-0.4 exhibits an obvious enhancement in photocurrent density compared to the pristine TiO 2 . Electrochemical impendence spectroscopy (EIS) and Time-resolved photoluminescence (PL) have been employed to study the charge recombination in TiO 2 @In 2 O 3 nanostructure. The surface passivation of TiO 2 nanorods (NRs) with In 2 O 3 nanostructures helps to the suppression of the surface defects. The surface-passivated photoanode (IN-0.4) has demonstrated the improved hydrogen generation activity (125 μmol∙h −1 ) of TiO 2 nanorods (NRs) with In 2 O 3 nanostructures during water splitting and organic decomposition. The probable causes of the enhancement in hydrogen evolution could be due to (i) enhanced photogenerated electron transport (ii) increased active surface area with In 2 O 3 and/or (iii) catalytic activity of In 2 O 3 . Moreover, the photoelectrocatalytic activities of IN-0.4 were slight affect during degradation of Bisphenol A and methyl orange dye, which might be due to the lower hole mobility in TiO 2 @In 2 O 3 heteroarchitecture photoelectrodes. These sightings and proposed schematic model can help to understand the charge transfer dynamics in hierarchical TiO 2 @In 2 O 3 heteroarchitecture photoelectrodes as well as designing multifaceted photoelectrodes for solar energy conversion.

KW - BPA degradation

KW - Charge transfer mechanism

KW - Photoelectrochemical hydrogen generation

KW - TiO @In O heteroarchitecture photoelectrodes

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An GW, Mahadik MA, Piao G, Chae WS, Park H, Cho M et al. Hierarchical TiO ₂ @In ₂ O ₃ heteroarchitecture photoanodes: Mechanistic study on interfacial charge carrier dynamics through water splitting and organic decomposition. Applied Surface Science. 2019 Jun 30;480:1-12. doi: 10.1016/j.apsusc.2019.02.196