AI Article Synopsis
- The study highlights the importance of designing effective catalysts for the oxygen evolution reaction (OER), crucial for energy conversion.
- Postspinel-structured oxides, specifically CaO with different metal substitutions (Cr, Mn, and Fe), showed superior OER performance compared to traditional perovskite and spinel oxides.
- Analysis indicates that the enhanced performance is linked to lower charge-transfer resistances, and a theoretical model suggests a new mechanism that may lead to lower energy losses during the OER process.
Article Abstract
The rational design principle of highly active catalysts for the oxygen evolution reaction (OER) is desired because of its versatility for energy-conversion applications. Postspinel-structured oxides, Ca O ( = Cr, Mn, and Fe), have exhibited higher OER activities than nominally isoelectronic conventional counterparts of perovskite oxides LaO and spinel oxides Zn O. Electrochemical impedance spectroscopy reveals that the higher OER activities for Ca O series are attributed to the lower charge-transfer resistances. A density-functional-theory calculation proposes a novel mechanism associated with lattice oxygen pairing with adsorbed oxygen, demonstrating the lowest theoretical OER overpotential than other mechanisms examined in this study. This finding proposes a structure-driven design of electrocatalysts associated with a novel OER mechanism.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8981248 | PMC |
| http://dx.doi.org/10.1039/d2ra00448h | DOI Listing |
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