What is it about?

When the system is near the metal-insulator boundary for Sr-doped CaRuO3, it leads to a remarkable activity enhancement in oxygen evolution reaction (OER). Sr-doped CaRuO3 demonstrates that the coexistence of metallic conductivity and strong electron correlation is the key to achieve both low overpotential and high current density in OER.

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Why is it important?

This study informs that highly conducting materials close to the metal-insulator boundary are promising for the development of highly efficient OER catalysts. Also, it demonstrates that electron correlation not only enhances the initial OER activity but also stabilizes the structure of the catalyst.

Perspectives

In this study, Sr-doped CaRuO3 showed excellent OER performance, accompanied by superior bifunctionality toward OER and oxygen reduction reaction. Therefore, highly conducting materials close to the metal–insulator boundary are promising oxygen reaction catalysts for both water splitting and rechargeable metal–air batteries.

Shigeto Hirai

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This page is a summary of: Ca1−xSrxRuO3 perovskite at the metal–insulator boundary as a highly active oxygen evolution catalyst, Journal of Materials Chemistry A, January 2019, Royal Society of Chemistry, DOI: 10.1039/c9ta03789f.
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