Exploring the stability and protonic conductivity in W- and Mo-substituted LaNbO4 under reducing atmosphere
File(s)
Published version
Author(s)
Huang, kehan
Han, yidong
Isaacs, Mark
Skinner, Stephen
Type
Journal Article
Abstract
LaNb0.84W0.16O4+δ (LNW16) and LaNb0.84Mo0.16O4+δ (LNM16) have been synthesized via a solid-state reaction route. Both samples underwent 5%-H2 treatments at 800 °C to investigate their stability under a reducing atmosphere. The crystal structures, compositions, and oxidation states were studied before and after treatment showing excellent structural, compositional and redox stability of LaNb0.84W0.16O4+δ, while LaNb0.84Mo0.16O4+δ is reduced significantly. Therefore, the electrochemical performance of LaNb0.84W0.16O4+δ under reducing atmospheres was further investigated. Higher conductivity was observed for the LNW16 samples measured under reducing atmospheres. However, the larger conductivity enhancement in the low temperature range (400 °C to 600 °C) compared with the high temperature range (600 °C to 800 °C) deviated from the conventional electronic conductivity emerging from reduction. DC polarization measurements further proved the predominant protonic conductivity in LaNb0.84W0.16O4+δ under reducing atmospheres.
Date Issued
2025-02-14
Date Acceptance
2024-12-23
Citation
Journal of Materials Chemistry A, 2025, 13 (6), pp.4214-4224
ISSN
2050-7488
Publisher
Royal Society of Chemistry
Start Page
4214
End Page
4224
Journal / Book Title
Journal of Materials Chemistry A
Volume
13
Issue
6
Copyright Statement
© The Royal Society of Chemistry 2025 Open Access Article. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
License URL
Identifier
https://pubs.rsc.org/en/content/articlelanding/2025/ta/d4ta05501b
Publication Status
Published
Date Publish Online
2024-12-23