Corrosion of TiHfZrNb<inf>x</inf> high-entropy alloys in a simulated condition of proton exchange membrane water electrolyser

Kadiri, M; Tanji, A; Fan, X; Liaw, PK; Mahlia, TMI; Hermawan, H

Corrosion of TiHfZrNb<inf>x</inf> high-entropy alloys in a simulated condition of proton exchange membrane water electrolyser

Kadiri, M Tanji, A Fan, X Liaw, PK Mahlia, TMI Hermawan, H

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Publisher:: PERGAMON-ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: Electrochimica Acta, 2025, 521
Issue Date:: 2025-05-01

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Field	Value	Language
dc.contributor.author	Kadiri, M
dc.contributor.author	Tanji, A
dc.contributor.author	Fan, X
dc.contributor.author	Liaw, PK
dc.contributor.author	Mahlia, TMI
dc.contributor.author	Hermawan, H
dc.date.accessioned	2025-04-14T00:06:00Z
dc.date.available	2025-04-14T00:06:00Z
dc.date.issued	2025-05-01
dc.identifier.citation	Electrochimica Acta, 2025, 521
dc.identifier.issn	0013-4686
dc.identifier.issn	1873-3859
dc.identifier.uri	http://hdl.handle.net/10453/186868
dc.description.abstract	In the present work, the corrosion behavior and passive film properties of TiHfZrNbx (x = 0.2, 0.3 and 0.4) high-entropy alloys (HEAs) were evaluated under a simulated condition of a proton exchange membrane water electrolyser (PEMWE) in view of their application as bipolar plates. Results from electrochemical-impedance spectroscopy, cyclic- and static-polarizations evaluation revealed that in a 0.5 M H2SO4 + 5 ppm F– solution at 70 °C the HEAs exhibited about 600 times higher polarization resistance than that of CP-Ti, with the highest achieved at 79.57 kΩ.cm2 for TiHfZrNb0.2, leading to a sharp contrast in the corrosion-current density, 805.11 µA.cm-2 for the CP-Ti vs. 0.92 µA.cm-2 for the TiHfZrNb0.2, reflecting a far superior corrosion resistance of the HEAs. X-ray photoelectron spectroscopy analysis confirmed the formation of a multi-oxide passive film, predominantly by HfO2 > ZrO2 > TiO2, with a presence of Nb2O5 only in TiHfZrNb0.4, all possess an n-type semiconducting characteristic and a much lower electron-donor concentration in the HEAs than in the CP-Ti. The complementary analyses of scanning electron microscopy, atomic force microscopy and solution chemistry highlighted the synergistic effects of Hf, Zr, and Nb in enhancing protectiveness of the passive film, but the absence of Nb2O5 on the top surface of TiHfZrNb0.2 and TiHfZrNb0.3 indicated a small role of Nb toward passivation.
dc.language	English
dc.publisher	PERGAMON-ELSEVIER SCIENCE LTD
dc.relation.ispartof	Electrochimica Acta
dc.relation.isbasedon	10.1016/j.electacta.2025.145925
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	02 Physical Sciences, 03 Chemical Sciences, 09 Engineering
dc.subject.classification	Energy
dc.subject.classification	34 Chemical sciences
dc.subject.classification	40 Engineering
dc.subject.classification	51 Physical sciences
dc.title	Corrosion of TiHfZrNb<inf>x</inf> high-entropy alloys in a simulated condition of proton exchange membrane water electrolyser
dc.type	Journal Article
utslib.citation.volume	521
utslib.for	02 Physical Sciences
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	University of Technology Sydney/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Technology in Water and Wastewater (CTWW)
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Advanced Modelling and Geospatial lnformation Systems (CAMGIS)
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Green Technology (CGT)
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Green Technology (CGT)/Centre for Green Technology (CGT) Associate Members
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2025-04-14T00:05:51Z
pubs.publication-status	Accepted
pubs.volume	521

Abstract:

In the present work, the corrosion behavior and passive film properties of TiHfZrNbx (x = 0.2, 0.3 and 0.4) high-entropy alloys (HEAs) were evaluated under a simulated condition of a proton exchange membrane water electrolyser (PEMWE) in view of their application as bipolar plates. Results from electrochemical-impedance spectroscopy, cyclic- and static-polarizations evaluation revealed that in a 0.5 M H2SO4 + 5 ppm F– solution at 70 °C the HEAs exhibited about 600 times higher polarization resistance than that of CP-Ti, with the highest achieved at 79.57 kΩ.cm2 for TiHfZrNb0.2, leading to a sharp contrast in the corrosion-current density, 805.11 µA.cm-2 for the CP-Ti vs. 0.92 µA.cm-2 for the TiHfZrNb0.2, reflecting a far superior corrosion resistance of the HEAs. X-ray photoelectron spectroscopy analysis confirmed the formation of a multi-oxide passive film, predominantly by HfO2 > ZrO2 > TiO2, with a presence of Nb2O5 only in TiHfZrNb0.4, all possess an n-type semiconducting characteristic and a much lower electron-donor concentration in the HEAs than in the CP-Ti. The complementary analyses of scanning electron microscopy, atomic force microscopy and solution chemistry highlighted the synergistic effects of Hf, Zr, and Nb in enhancing protectiveness of the passive film, but the absence of Nb2O5 on the top surface of TiHfZrNb0.2 and TiHfZrNb0.3 indicated a small role of Nb toward passivation.

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http://hdl.handle.net/10453/186868