Doping design strategies of proton-conducting perovskite oxides: A brief compositional map

• Published in: International journal of hydrogen energy Vol. 161; p. 150689
• Main Author: Medvedev, Dmitry A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 22.08.2025
• Subjects: Electrochemistry; Energy conversion; PCFC & PCEC; Perovskite; Proton transport; Electrochemistry; Perovskite; PCFC & PCEC; Energy conversion; Proton transport
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2025.150689

Proton-conducting perovskite materials have attracted considerable attention from experts in materials science, solid-state ionics, and high-temperature electrochemistry. These materials are unique because the original complex oxide structure is free of protons; however, proton defects (charge carriers) may appear in the structure when it is in contact with a humid atmosphere at high temperatures. These newly formed protons result in high ionic conductivity values, which are greatly beneficial for designing low- and intermediate-temperature electrochemical devices. Many breakthrough results have been recently achieved in the application of proton-conducting perovskite materials and related electrochemical cells. Most of these results were obtained using state-of-the-art electrolytes based on Y/Yb-doped cerate-zirconates. However, the class of proton-conducting perovskite oxides is much broader than just cerates and zirconates. Each type of oxides has its own advantages and limitations. This review briefly outlines potential proton-conducting perovskite materials and focuses on strategies for their chemical modification (doping). In this regard, not only classical A2+B4+O3 perovskites, but also A1+B5+O3 and A3+B3+O3 counterparts were considered in detail. In conclusion, this work is a valuable resource for identifying interesting objects among the wide variety of proton-conducting oxide perovskites, considering their historical milestones and recent progress. [Display omitted] •The review discusses proton-conducting perovskite oxides (ABO3).•A2+B4+O3, A1+B5+O3, and A3+B3+O3 classes and their representatives are reviewed.•Each system is considered from a historical perspective.•Doping strategies (the main subjects of the review) are discussed.