Increase in Photocurrent Density of WO3Photoanode by Placing a Layer of an Ordered Array of Mesoporous WO3Micropillars on Top of a WO3Sheet Layer

Sarnai Puntsagdorj; Agni Raj Koirala; Jargalsaikhan Gombovanjil; Nguyen Nguyen Khanh; Sang Do Sung; Wan In Lee; Kyung Byung Yoon

doi:10.1021/acsami.2c05107

Increase in Photocurrent Density of WO₃Photoanode by Placing a Layer of an Ordered Array of Mesoporous WO₃Micropillars on Top of a WO₃Sheet Layer

Sarnai Puntsagdorj, Agni Raj Koirala, Jargalsaikhan Gombovanjil, Nguyen Nguyen Khanh, Sang Do Sung, Wan In Lee, Kyung Byung Yoon

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

12 Scopus citations

Abstract

A facile stamping method was developed to assemble ordered arrays of mesoporous WO₃micropillars with uniform sizes, shapes, and lengths on F-doped tin oxide glass. Using this method, a series of WO₃heterostructural bilayer photoanodes consisting of an array of m-μm long ordered mesoporous WO₃micropillars at the top and the n-μm thick mesoporous WO₃plain sheet layer at the bottom (denoted as m/n) were prepared. Among them 2.5/7.5 displayed a steady state photocurrent density of 3.6 mA cm^-2at 1.23 V (vs RHE) under AM 1.5 (1 Sun), which is much higher than that of the plain 10-μm thick WO₃sheet (2.5 mA cm^-2). This phenomenon occurs owing to the following six benefits: increases in charge carrier density, number of photogenerated electron, charge collection rate, thermodynamic feasibility for the vectorial charge transport from the outermost layer of the photoanode to the inner layer, the surface hydrophilicity, and the decrease in charge transfer resistance.

Original language	English
Pages (from-to)	31838-31850
Number of pages	13
Journal	ACS applied materials & interfaces
Volume	14
Issue number	28
DOIs	https://doi.org/10.1021/acsami.2c05107
State	Published - 20 Jul 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Keywords

carrier density increase
charge collection rate increase
charge transfer resistance decrease
higher surface hydrophilicity
photoelectrochemical water splitting
vectorial charge transfer

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

Access to Document

10.1021/acsami.2c05107

Cite this

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title = "Increase in Photocurrent Density of WO3Photoanode by Placing a Layer of an Ordered Array of Mesoporous WO3Micropillars on Top of a WO3Sheet Layer",

abstract = "A facile stamping method was developed to assemble ordered arrays of mesoporous WO3micropillars with uniform sizes, shapes, and lengths on F-doped tin oxide glass. Using this method, a series of WO3heterostructural bilayer photoanodes consisting of an array of m-μm long ordered mesoporous WO3micropillars at the top and the n-μm thick mesoporous WO3plain sheet layer at the bottom (denoted as m/n) were prepared. Among them 2.5/7.5 displayed a steady state photocurrent density of 3.6 mA cm-2at 1.23 V (vs RHE) under AM 1.5 (1 Sun), which is much higher than that of the plain 10-μm thick WO3sheet (2.5 mA cm-2). This phenomenon occurs owing to the following six benefits: increases in charge carrier density, number of photogenerated electron, charge collection rate, thermodynamic feasibility for the vectorial charge transport from the outermost layer of the photoanode to the inner layer, the surface hydrophilicity, and the decrease in charge transfer resistance.",

keywords = "carrier density increase, charge collection rate increase, charge transfer resistance decrease, higher surface hydrophilicity, photoelectrochemical water splitting, vectorial charge transfer",

author = "Sarnai Puntsagdorj and Koirala, {Agni Raj} and Jargalsaikhan Gombovanjil and Khanh, {Nguyen Nguyen} and Sung, {Sang Do} and Lee, {Wan In} and Yoon, {Kyung Byung}",

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Increase in Photocurrent Density of WO₃Photoanode by Placing a Layer of an Ordered Array of Mesoporous WO₃Micropillars on Top of a WO₃Sheet Layer. / Puntsagdorj, Sarnai; Koirala, Agni Raj; Gombovanjil, Jargalsaikhan et al.
In: ACS applied materials & interfaces, Vol. 14, No. 28, 20.07.2022, p. 31838-31850.

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

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AU - Puntsagdorj, Sarnai

AU - Koirala, Agni Raj

AU - Gombovanjil, Jargalsaikhan

AU - Khanh, Nguyen Nguyen

AU - Sung, Sang Do

AU - Lee, Wan In

AU - Yoon, Kyung Byung

PY - 2022/7/20

Y1 - 2022/7/20

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