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Improving the electrochemical performance of Co-based layered-double hydroxides by incorporation of ▫$M^{3+}$▫ metal ions
Anja Siher, Andraž Mavrič, Matjaž Valant, 2023, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: energy storage systems, pseudocapacitors, layered-double hydroxides, cobalt hydroxide
Objavljeno v RUNG: 05.04.2024; Ogledov: 407; Prenosov: 0
Gradivo ima več datotek! Več...

Non-covalent ligand-oxide interaction promotes oxygen evolution
Qianbao Wu, Junwu Liang, Mengjun Xiao, Chang Long, Lei Li, Zhenhua Zeng, Andraž Mavrič, Xia Zheng, Jing Zhu, Matjaž Valant, 2023, izvirni znanstveni članek

Opis: Strategies to generate high-valence metal species capable of oxidizing water often employ composition and coordination tuning of oxide-based catalysts, where strong covalent interactions with metal sites are crucial. However, it remains unexplored whether a relatively weak “non-bonding” interaction between ligands and oxides can mediate the electronic states of metal sites in oxides. Here we present an unusual non-covalent phenanthroline-CoO2 interaction that substantially elevates the population of Co4+ sites for improved water oxidation. We find that phenanthroline only coordinates with Co2+ forming soluble Co(phenanthroline)2(OH)2 complex in alkaline electrolytes, which can be deposited as amorphous CoOxHy film containing non-bonding phenanthroline upon oxidation of Co2+ to Co3+/4+. This in situ deposited catalyst demonstrates a low overpotential of 216 mV at 10 mA cm−2 and sustainable activity over 1600 h with Faradaic efficiency above 97%. Density functional theory calculations reveal that the presence of phenanthroline can stabilize CoO2 through the non-covalent interaction and generate polaron-like electronic states at the Co-Co center.
Ključne besede: water oxidation, cobalt hydroxide, ligand-metal interactions
Objavljeno v RUNG: 23.02.2023; Ogledov: 1595; Prenosov: 15
.pdf Celotno besedilo (1,77 MB)

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