Breaking the Mutual-Constraint of Bifunctional Oxygen Electrocatalysis via Direct O─O Coupling on High-Valence Ir Single-Atom on MnO<sub>x</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 39558778.
- Also identified by DOI 10.1002/adma.202412950.
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Abstract
Insufficient bifunctional activity of electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is the major obstruction to the application of rechargeable metal-air batteries. The primary reason is the mutual constraint of ORR and OER mechanism, involving the same oxygen-containing intermediates and demonstrating the scaling limitations of the adsorption energies. Herein, it is reported a high-valence Ir single atom anchored on manganese oxide (Ir<sub>SA</sub>-MnO<sub>x</sub>) bifunctional catalyst showing independent pathways for ORR and OER, i.e., associated 4e<sup>-</sup> pathway on high-valence Ir site for ORR and a novel chemical-activated concerted mechanism for OER, where a distinct spontaneous chemical activation process triggers direct O─O coupling. The Ir<sub>SA</sub>-MnO<sub>x</sub> therefore delivers outstanding bifunctional activities with remarkably low potential difference (0.635 V) between OER potential at 10 mA cm<sup>-2</sup> and ORR half-wave potential in alkaline solution. This work breaks the scaling limitations and provides a new avenue to design efficient and multifunctional electrocatalysts.