Insight into Charge Separation in WO3/BiVO4 Heterojunction for Solar Water Splitting

Sang Youn Chae, Chang Soo Lee, Hyejin Jung, Oh Shim Joo, Byoung Koun Min, Jong Hak Kim, Yun Jeong Hwang

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Recently, the WO3/BiVO4 heterojunction has shown promising photoelectrochemical (PEC) water splitting activity based on its charge transfer and light absorption capability, and notable enhancement of the photocurrent has been achieved via morphological modification of WO3. We developed a graft copolymer-assisted protocol for the synthesis of WO3 mesoporous thin films on a transparent conducting electrode, wherein the particle size, particle shape, and thickness of the WO3 layer were controlled by tuning the interactions in the polymer/sol-gel hybrid. The PEC performance of the WO3 mesoporous photoanodes with various morphologies and the individual heterojunctions with BiVO4 (WO3/BiVO4) were characterized by measuring the photocurrents in the absence/presence of hole scavengers using light absorption spectroscopy and intensity-modulated photocurrent spectroscopy. The morphology of the WO3 photoanode directly influenced the charge separation efficiency within the WO3 layer and concomitant charge collection efficiency in the WO3/BiVO4 heterojunction, showing the smaller sized nanosphere WO3 layer showed higher values than did the plate-like or rod-like one. Notably, we observed that photocurrent density of WO3/BiVO4 was not dependent on the thickness of WO3 film or its charge collection time, implying slow charge flow from BiVO4 to WO3 can be a crucial issue in determining the photocurrent, rather than the charge separation within the nanosphere WO3 layer.

Original languageEnglish
Pages (from-to)19780-19790
Number of pages11
JournalACS Applied Materials and Interfaces
Volume9
Issue number23
DOIs
Publication statusPublished - 2017 Jun 14

Fingerprint

Photocurrents
Heterojunctions
Water
Nanospheres
Light absorption
Graft copolymers
Absorption spectroscopy
Sol-gels
Charge transfer
Tuning
Particle size
bismuth vanadium tetraoxide
Spectroscopy
Polymers
Thin films
Electrodes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Chae, Sang Youn ; Lee, Chang Soo ; Jung, Hyejin ; Joo, Oh Shim ; Min, Byoung Koun ; Kim, Jong Hak ; Hwang, Yun Jeong. / Insight into Charge Separation in WO3/BiVO4 Heterojunction for Solar Water Splitting. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 23. pp. 19780-19790.
@article{195eda65267a4c3bb3b858147b52a7f3,
title = "Insight into Charge Separation in WO3/BiVO4 Heterojunction for Solar Water Splitting",
abstract = "Recently, the WO3/BiVO4 heterojunction has shown promising photoelectrochemical (PEC) water splitting activity based on its charge transfer and light absorption capability, and notable enhancement of the photocurrent has been achieved via morphological modification of WO3. We developed a graft copolymer-assisted protocol for the synthesis of WO3 mesoporous thin films on a transparent conducting electrode, wherein the particle size, particle shape, and thickness of the WO3 layer were controlled by tuning the interactions in the polymer/sol-gel hybrid. The PEC performance of the WO3 mesoporous photoanodes with various morphologies and the individual heterojunctions with BiVO4 (WO3/BiVO4) were characterized by measuring the photocurrents in the absence/presence of hole scavengers using light absorption spectroscopy and intensity-modulated photocurrent spectroscopy. The morphology of the WO3 photoanode directly influenced the charge separation efficiency within the WO3 layer and concomitant charge collection efficiency in the WO3/BiVO4 heterojunction, showing the smaller sized nanosphere WO3 layer showed higher values than did the plate-like or rod-like one. Notably, we observed that photocurrent density of WO3/BiVO4 was not dependent on the thickness of WO3 film or its charge collection time, implying slow charge flow from BiVO4 to WO3 can be a crucial issue in determining the photocurrent, rather than the charge separation within the nanosphere WO3 layer.",
author = "Chae, {Sang Youn} and Lee, {Chang Soo} and Hyejin Jung and Joo, {Oh Shim} and Min, {Byoung Koun} and Kim, {Jong Hak} and Hwang, {Yun Jeong}",
year = "2017",
month = "6",
day = "14",
doi = "10.1021/acsami.7b02486",
language = "English",
volume = "9",
pages = "19780--19790",
journal = "ACS applied materials & interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "23",

}

Insight into Charge Separation in WO3/BiVO4 Heterojunction for Solar Water Splitting. / Chae, Sang Youn; Lee, Chang Soo; Jung, Hyejin; Joo, Oh Shim; Min, Byoung Koun; Kim, Jong Hak; Hwang, Yun Jeong.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 23, 14.06.2017, p. 19780-19790.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Insight into Charge Separation in WO3/BiVO4 Heterojunction for Solar Water Splitting

AU - Chae, Sang Youn

AU - Lee, Chang Soo

AU - Jung, Hyejin

AU - Joo, Oh Shim

AU - Min, Byoung Koun

AU - Kim, Jong Hak

AU - Hwang, Yun Jeong

PY - 2017/6/14

Y1 - 2017/6/14

N2 - Recently, the WO3/BiVO4 heterojunction has shown promising photoelectrochemical (PEC) water splitting activity based on its charge transfer and light absorption capability, and notable enhancement of the photocurrent has been achieved via morphological modification of WO3. We developed a graft copolymer-assisted protocol for the synthesis of WO3 mesoporous thin films on a transparent conducting electrode, wherein the particle size, particle shape, and thickness of the WO3 layer were controlled by tuning the interactions in the polymer/sol-gel hybrid. The PEC performance of the WO3 mesoporous photoanodes with various morphologies and the individual heterojunctions with BiVO4 (WO3/BiVO4) were characterized by measuring the photocurrents in the absence/presence of hole scavengers using light absorption spectroscopy and intensity-modulated photocurrent spectroscopy. The morphology of the WO3 photoanode directly influenced the charge separation efficiency within the WO3 layer and concomitant charge collection efficiency in the WO3/BiVO4 heterojunction, showing the smaller sized nanosphere WO3 layer showed higher values than did the plate-like or rod-like one. Notably, we observed that photocurrent density of WO3/BiVO4 was not dependent on the thickness of WO3 film or its charge collection time, implying slow charge flow from BiVO4 to WO3 can be a crucial issue in determining the photocurrent, rather than the charge separation within the nanosphere WO3 layer.

AB - Recently, the WO3/BiVO4 heterojunction has shown promising photoelectrochemical (PEC) water splitting activity based on its charge transfer and light absorption capability, and notable enhancement of the photocurrent has been achieved via morphological modification of WO3. We developed a graft copolymer-assisted protocol for the synthesis of WO3 mesoporous thin films on a transparent conducting electrode, wherein the particle size, particle shape, and thickness of the WO3 layer were controlled by tuning the interactions in the polymer/sol-gel hybrid. The PEC performance of the WO3 mesoporous photoanodes with various morphologies and the individual heterojunctions with BiVO4 (WO3/BiVO4) were characterized by measuring the photocurrents in the absence/presence of hole scavengers using light absorption spectroscopy and intensity-modulated photocurrent spectroscopy. The morphology of the WO3 photoanode directly influenced the charge separation efficiency within the WO3 layer and concomitant charge collection efficiency in the WO3/BiVO4 heterojunction, showing the smaller sized nanosphere WO3 layer showed higher values than did the plate-like or rod-like one. Notably, we observed that photocurrent density of WO3/BiVO4 was not dependent on the thickness of WO3 film or its charge collection time, implying slow charge flow from BiVO4 to WO3 can be a crucial issue in determining the photocurrent, rather than the charge separation within the nanosphere WO3 layer.

UR - http://www.scopus.com/inward/record.url?scp=85020820502&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020820502&partnerID=8YFLogxK

U2 - 10.1021/acsami.7b02486

DO - 10.1021/acsami.7b02486

M3 - Article

AN - SCOPUS:85020820502

VL - 9

SP - 19780

EP - 19790

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

SN - 1944-8244

IS - 23

ER -