Tuning Single-Atom Dopants on Manganese Oxide for Selective Electrocatalytic Cyclooctene Epoxidation

Autor:	Minju Chung, Kyoungsuk Jin, Joy S. Zeng, Thu N. Ton, Karthish Manthiram
Rok vydání:	2022
Předmět:	Colloid and Surface Chemistry General Chemistry Biochemistry Catalysis
Zdroj:	Journal of the American Chemical Society. 144:17416-17422
ISSN:	1520-5126 0002-7863
Popis:	Selective and efficient electrocatalysts are imperative for the successful deployment of electrochemistry toward synthetic applications. In this study, we used galvanic replacement reactions to synthesize iridium-decorated manganese oxide nanoparticles, which showed a cyclooctene epoxidation partial current density of 10.5 ± 2.8 mA/cm² and a Faradaic efficiency of 46 ± 4%. Results from operando X-ray absorption spectroscopy suggest that manganese leaching from the nanoparticles during galvanic replacement introduces lattice vacancies that make the nanoparticles more susceptible to metal oxidation and catalyst reconstruction under an applied anodic potential. This results in an increased presence of electrophilic oxygen atoms on the catalyst surface during reaction conditions, which may contribute to the enhanced electrocatalytic activity toward cyclooctene epoxidation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f6dbce770275b77508576a369855e09a https://doi.org/10.1021/jacs.2c04711 Zobrazit plný text záznamu