Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 27, 2020
Previous Article Next Article

Role of B site ions in bifunctional oxygen electrocatalysis: a structure–property correlation study on doped Ca2Fe2O5 brownmillerites

Author affiliations

Abstract

The role of B site doping with transition metals in brownmillerites, a perovskite related family of compounds, in bifunctional oxygen electrocatalysis, viz., simultaneous reduction and evolution reactions, is analysed. Ca2Fe1.9M0.1O5 (M = Mn, Co, Ni, and Cu) is synthesised and structurally characterised by powder XRD and Rietveld refinement. Valence states of the surface B site ions are identified by X-ray photoelectron spectroscopy. Bifunctional oxygen electrochemistry is studied with the RDE and RRDE techniques and correlated with the structural and electronic parameters like oxygen non-stoichiometry and B site catalytic activity. Since the widely accepted electronic descriptors like eg filling may not be sufficient for explaining the bifunctional activity, B site electron donating capability as well as the extent of oxygen vacancies enhancing O2 adsorption is also considered. Such structural parameters are also found to influence both the ORR and OER and based on this, Ni doping is proposed as advantageous for the bifunctional activity.

Graphical abstract: Role of B site ions in bifunctional oxygen electrocatalysis: a structure–property correlation study on doped Ca2Fe2O5 brownmillerites

Back to tab navigation

Supplementary files

Article information


Submitted
04 May 2020
Accepted
10 Jun 2020
First published
11 Jun 2020

Phys. Chem. Chem. Phys., 2020,22, 15520-15527
Article type
Paper

Role of B site ions in bifunctional oxygen electrocatalysis: a structure–property correlation study on doped Ca2Fe2O5 brownmillerites

S. Thundiyil, C. P. Vinod, S. Kurungot and R. N. Devi, Phys. Chem. Chem. Phys., 2020, 22, 15520
DOI: 10.1039/D0CP02391D

Social activity

Search articles by author

Spotlight

Advertisements