Surface passivation of zinc ferrite nanorod photoanodes by spray-deposited silicon oxide layer for enhanced solar water splitting

Haiqing Ma; Mahadeo A. Mahadik; Sa Rang Kim; Miao Wang; Hyeon Ih Ryu; Hee Suk Chung; Weon Sik Chae; Hyunwoong Park; Jum Suk Jang

doi:10.1016/j.jtice.2019.11.014

Surface passivation of zinc ferrite nanorod photoanodes by spray-deposited silicon oxide layer for enhanced solar water splitting

Haiqing Ma, Mahadeo A. Mahadik, Sa Rang Kim, Miao Wang, Hyeon Ih Ryu, Hee Suk Chung, Weon Sik Chae, Hyunwoong Park, Jum Suk Jang

School of Energy Engineering

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

7 Scopus citations

Abstract

ZnFe₂O₄ nanorods (NR's) were prepared by a chemical conversion method from β-FeOOH NRs grown on FTO substrates. To activate their photoactivity of ZnFe₂O₄ NRs for solar water splitting, the surface passivation was achieved with SiO₂ layer via facile and effective spray pyrolysis method. The presence of SiO₂ layer enhances the photocurrent density of the Pristine ZnFe₂O₄ from 143 µA/cm² to 212 µA/cm² at 1.23 V_RHE for 0.25 mM Si–ZnFe₂O₄, representing two time increment in the photocurrent density. The influences of amount of Si precursor (Tetraethyl orthosilicate) solutions on the physical properties and the passivation effect of SiO₂/ZnFe₂O₄ interfaces were investigated. This improved photoresponse of the Si-treated ZnFe₂O₄ NRs was attributed to the excellent charge transfer electrode/electrolyte interface. The effectively improved charge transfer properties of the Si-treated ZnFe₂O₄ NRs were demonstrated by the electrochemical impedance spectroscopy (EIS), Mott–Schottky (MS) and intensity-modulated photocurrent spectroscopy (IMPS) analyses.

Original language	English
Pages (from-to)	89-97
Number of pages	9
Journal	Journal of the Taiwan Institute of Chemical Engineers
Volume	107
DOIs	https://doi.org/10.1016/j.jtice.2019.11.014
State	Published - Feb 2020

Keywords

SiO passivation layer
Solar water splitting
Spray pyrolysis
ZnFeO nanorods

UN SDGs

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

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10.1016/j.jtice.2019.11.014

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title = "Surface passivation of zinc ferrite nanorod photoanodes by spray-deposited silicon oxide layer for enhanced solar water splitting",

abstract = "ZnFe2O4 nanorods (NR's) were prepared by a chemical conversion method from β-FeOOH NRs grown on FTO substrates. To activate their photoactivity of ZnFe2O4 NRs for solar water splitting, the surface passivation was achieved with SiO2 layer via facile and effective spray pyrolysis method. The presence of SiO2 layer enhances the photocurrent density of the Pristine ZnFe2O4 from 143 µA/cm2 to 212 µA/cm2 at 1.23 VRHE for 0.25 mM Si–ZnFe2O4, representing two time increment in the photocurrent density. The influences of amount of Si precursor (Tetraethyl orthosilicate) solutions on the physical properties and the passivation effect of SiO2/ZnFe2O4 interfaces were investigated. This improved photoresponse of the Si-treated ZnFe2O4 NRs was attributed to the excellent charge transfer electrode/electrolyte interface. The effectively improved charge transfer properties of the Si-treated ZnFe2O4 NRs were demonstrated by the electrochemical impedance spectroscopy (EIS), Mott–Schottky (MS) and intensity-modulated photocurrent spectroscopy (IMPS) analyses.",

keywords = "SiO passivation layer, Solar water splitting, Spray pyrolysis, ZnFeO nanorods",

author = "Haiqing Ma and Mahadik, {Mahadeo A.} and Kim, {Sa Rang} and Miao Wang and Ryu, {Hyeon Ih} and Chung, {Hee Suk} and Chae, {Weon Sik} and Hyunwoong Park and Jang, {Jum Suk}",

note = "Publisher Copyright: {\textcopyright} 2019 Taiwan Institute of Chemical Engineers",

year = "2020",

month = feb,

doi = "10.1016/j.jtice.2019.11.014",

language = "English",

volume = "107",

pages = "89--97",

journal = "Journal of the Taiwan Institute of Chemical Engineers",

issn = "1876-1070",

publisher = "Taiwan Institute of Chemical Engineers",

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TY - JOUR

T1 - Surface passivation of zinc ferrite nanorod photoanodes by spray-deposited silicon oxide layer for enhanced solar water splitting

AU - Ma, Haiqing

AU - Mahadik, Mahadeo A.

AU - Kim, Sa Rang

AU - Wang, Miao

AU - Ryu, Hyeon Ih

AU - Chung, Hee Suk

AU - Chae, Weon Sik

AU - Park, Hyunwoong

AU - Jang, Jum Suk

PY - 2020/2

Y1 - 2020/2

N2 - ZnFe2O4 nanorods (NR's) were prepared by a chemical conversion method from β-FeOOH NRs grown on FTO substrates. To activate their photoactivity of ZnFe2O4 NRs for solar water splitting, the surface passivation was achieved with SiO2 layer via facile and effective spray pyrolysis method. The presence of SiO2 layer enhances the photocurrent density of the Pristine ZnFe2O4 from 143 µA/cm2 to 212 µA/cm2 at 1.23 VRHE for 0.25 mM Si–ZnFe2O4, representing two time increment in the photocurrent density. The influences of amount of Si precursor (Tetraethyl orthosilicate) solutions on the physical properties and the passivation effect of SiO2/ZnFe2O4 interfaces were investigated. This improved photoresponse of the Si-treated ZnFe2O4 NRs was attributed to the excellent charge transfer electrode/electrolyte interface. The effectively improved charge transfer properties of the Si-treated ZnFe2O4 NRs were demonstrated by the electrochemical impedance spectroscopy (EIS), Mott–Schottky (MS) and intensity-modulated photocurrent spectroscopy (IMPS) analyses.

AB - ZnFe2O4 nanorods (NR's) were prepared by a chemical conversion method from β-FeOOH NRs grown on FTO substrates. To activate their photoactivity of ZnFe2O4 NRs for solar water splitting, the surface passivation was achieved with SiO2 layer via facile and effective spray pyrolysis method. The presence of SiO2 layer enhances the photocurrent density of the Pristine ZnFe2O4 from 143 µA/cm2 to 212 µA/cm2 at 1.23 VRHE for 0.25 mM Si–ZnFe2O4, representing two time increment in the photocurrent density. The influences of amount of Si precursor (Tetraethyl orthosilicate) solutions on the physical properties and the passivation effect of SiO2/ZnFe2O4 interfaces were investigated. This improved photoresponse of the Si-treated ZnFe2O4 NRs was attributed to the excellent charge transfer electrode/electrolyte interface. The effectively improved charge transfer properties of the Si-treated ZnFe2O4 NRs were demonstrated by the electrochemical impedance spectroscopy (EIS), Mott–Schottky (MS) and intensity-modulated photocurrent spectroscopy (IMPS) analyses.

KW - SiO passivation layer

KW - Solar water splitting

KW - Spray pyrolysis

KW - ZnFeO nanorods

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DO - 10.1016/j.jtice.2019.11.014

M3 - Article

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SN - 1876-1070

VL - 107

SP - 89

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JO - Journal of the Taiwan Institute of Chemical Engineers

JF - Journal of the Taiwan Institute of Chemical Engineers

ER -

Surface passivation of zinc ferrite nanorod photoanodes by spray-deposited silicon oxide layer for enhanced solar water splitting

Abstract

Keywords

UN SDGs

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