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Oxygen reduction at carbon supported lanthanides: the role of the B-site

Celorrio, Veronica, Dann, Ellie, Calvillo, Laura, Morgan, David John, Hall, Simon and Fermin, David J. 2016. Oxygen reduction at carbon supported lanthanides: the role of the B-site. ChemElectroChem 3 (2) , pp. 283-291. 10.1002/celc.201500440

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Abstract

The kinetics of the oxygen reduction reaction (ORR) at carbon supported transition metal oxides in alkaline solutions is systematically investigated as a function of the nature of the B-site. The study is focused on LaBO3 (B = Cr, Co, Fe, Mn and Ni) nanoparticles synthesized by an ionic liquid route, offering fine control over phase purity and composition. Activity towards the ORR was compared with commercial Pt/Etek catalyst. Detailed electrochemical analysis employing a rotating ring-disc electrode provides conclusive evidences that the carbon support plays an important contribution in the faradaic responses. Decoupling the contribution of the carbon support uncovers that the reactivity of LaMnO3 towards the 4e- ORR pathway is orders of magnitude higher than for the other lanthanides. We rationalise these observations in terms of changes in the redox state at the B-site close to the formal oxygen reduction potential.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Wiley-Blackwell
ISSN: 2196-0216
Date of Acceptance: 23 November 2015
Last Modified: 11 Sep 2020 09:14
URI: http://orca.cardiff.ac.uk/id/eprint/82769

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