Proton-conducting polymer electrolyte membrane water electrolysis (PEMWE) is a promising technology for generating clean and sustainable hydrogen fuels from water. However, PEMWE requires the use of expensive electrocatalysts; the currently available electrocatalysts for the oxygen evolution reaction (OER) depend on noble metals (Ir, Ru). Since noble metals are expensive, commercialization of PEMWE remains elusive. In addition, PEMWE suffers from the very slow kinetics of the OER in acidic media. Thus, the development of noble-metal-reduced, highly active, and acid-compatible oxygen evolution electrocatalysts is needed for the commercialization of PEMWE to be viable. In this regard, perovskite oxides have great potential for application as OER electrocatalysts in acidic media, because their multimetal-oxide forms can reduce the use of noble metals, and their high structural and compositional flexibility can modulate the electronic structure and OER activity. In this review, current knowledge regarding state-of-the-art perovskite oxides for acidic water oxidation electrocatalysts is summarized. First, the fundamental OER mechanism of electrocatalysts in acidic media is introduced briefly. Second, Ir- and Ru-based perovskite oxides in acidic solutions are provided, focusing on their stability and OER activity. Finally, some challenges facing the development of perovskite oxide-based electrocatalysts, and a perspective on their future are discussed.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea (Grant No. 2016M3A7B4909318). This research was supported by Basic Science Research Program through the NRF funded by the Ministry of Education (Program No. 2020R1A6A1A03045059).
© 2020 Wiley-VCH GmbH.
- noble metal reduction
- oxygen evolution reactions
- surface reconstruction
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science