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|Title:||Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity||Authors:||Pramana, Stevin S.
Handoko, Albertus D.
Chan, Kuang Wen
Walker, Robert J.
Herrin, Jason Scott
Yeo, Boon Siang
Payne, David J.
Kilner, John A.
Ryan, Mary P.
Skinner, Stephen J.
|Issue Date:||2018||Source:||Pramana, S. S., Cavallaro, A., Li, C., Handoko, A. D., Chan, K. W., Walker, R. J., … Skinner, S. J. (2018). Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity. Journal of Materials Chemistry A, 6(13), 5335-5345. doi:10.1039/C7TA06817D||Series/Report no.:||Journal of Materials Chemistry A||Abstract:||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.||URI:||https://hdl.handle.net/10356/81762
|ISSN:||2050-7488||DOI:||10.1039/C7TA06817D||Rights:||© 2018 The Authors (The Royal Society of Chemistry). This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||EOS Journal Articles|
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