Issue 35, 2021

Solid oxide proton conductors beyond perovskites

Abstract

Solid oxide proton conductors are crucially emerging as key materials for enabling hydrogen-based energy conversion, storage, and electrochemical technologies. Oxides crystallising in the ideal ABO3 perovskite structure, such as barium cerates and zirconates, are widely investigated thanks to their excellent proton conducting properties. Nevertheless, alternative structure-type solid oxide systems (hexagonal perovskite derivatives, brownmillerite, scheelite, etc.) can efficiently incorporate and enable the transport of protonic defects, with recent reports of materials exhibiting high ionic conductivity comparable to the conventional perovskite conductors. This perspective provides an overview of these alternative and less established proton conducting materials, with particular attention to the relationship between the structural and ionic conduction features and the mechanistic aspects. The goals are to highlight the differences between these materials and the traditional perovskites and to point out new potential crystal routes for the discovery of innovative solid oxide proton conductors.

Graphical abstract: Solid oxide proton conductors beyond perovskites

Article information

Article type
Perspective
Submitted
26 Apr. 2021
Accepted
04 Aug. 2021
First published
04 Aug. 2021

J. Mater. Chem. A, 2021,9, 18836-18856

Solid oxide proton conductors beyond perovskites

S. Fop, J. Mater. Chem. A, 2021, 9, 18836 DOI: 10.1039/D1TA03499E

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