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Lookup NU author(s): Dr Stevin PramanaORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
A cheap and direct solution towards engineering better catalysts through identification of novel materials is required for a sustainable energy system. Perovskite oxides have emerged as potential candidates to replace the less economically attractive Pt and IrO2 water splitting catalysts. In this work, excellent electrical conductivity (980 S cm-1 ) was found for the double perovskite of composition GdBa0.6Sr0.4Co2O6-d which is consistent with a better oxygen evolution reaction activity with the onset polarisation of 1.51 V with respect to a reversible hydrogen electrode (RHE). GdBa1-xSrxCo2O6-d with increasing Sr content was found to crystallise in the higher symmetry tetragonal P4/mmm space group in comparison with the undoped GdBaCo2O6-d which is orthorhombic (Pmmm), and yields higher oxygen uptake, accompanied by higher Co oxidation states. This outstanding electrochemical performance is explained by the wider carrier bandwidth, which is a function of Co–O–Co buckling angles and Co–O bond lengths. Furthermore the higher oxygen evolution activity was observed despite the formation of non-lattice oxides (mainly hydroxide species) and enrichment of alkaline earth ions on the surface.
Author(s): Pramana SS, Cavallaro A, Li C, Handoko AD, Chan KW, Walker RJ, Regoutz A, Herrin JS, Yeo BS, Payne DJ, Kilner JA, Ryan MP, Skinner SJ
Publication type: Article
Publication status: Published
Journal: Journal of Materials Chemistry A
Year: 2018
Volume: 6
Issue: 13
Pages: 5335-5345
Print publication date: 07/04/2018
Online publication date: 04/12/2018
Acceptance date: 20/10/2017
Date deposited: 22/01/2018
ISSN (print): 2050-7488
ISSN (electronic): 2050-7496
Publisher: Royal Society of Chemistry
URL: https://doi.org/10.1039/C7TA06817D
DOI: 10.1039/C7TA06817D
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