| Autor: |
Manohar, Ezhava Manu, Dhandapani, Hariharan N., Roy, Soumalya, Pełka, Robert, Rams, Michał, Konieczny, Piotr, Tothadi, Srinu, Kundu, Subrata, Dey, Atanu, Das, Sourav |
| Zdroj: |
Inorganic Chemistry; March 2024, Vol. 63 Issue: 11 p4883-4897, 15p |
| Abstrakt: |
The reaction of Co(OAc)2·6H2O with 2,2′-[{(1E,1′E)-pyridine-2,6-diyl-bis(methaneylylidene)bis(azaneylylidene)}diphenol](LH2) a multisite coordination ligand and Et3N in a 1:2:3 stoichiometric ratio forms a tetranuclear complex Co4(L)2(μ-η1:η1-OAc)2(η2-OAc)2]· 1.5 CH3OH· 1.5 CHCl3(1). Based on X-ray diffraction investigations, complex 1comprises a distorted Co4O4cubane core consisting of two completely deprotonated ligands [L]2–and four acetate ligands. Two distinct types of CoIIcenters exist in the complex, where the Co(2) center has a distorted octahedral geometry; alternatively, Co(1) has a distorted pentagonal–bipyramidal geometry. Analysis of magnetic data in 1shows predominant antiferromagnetic coupling (J= −2.1 cm–1), while the magnetic anisotropy is the easy-plane type (D1= 8.8, D2= 0.76 cm–1). Furthermore, complex 1demonstrates an electrochemical oxygen evolution reaction (OER) with an overpotential of 325 mV and Tafel slope of 85 mV dec–1, required to attain a current density of 10 mA cm–2and moderate stability under alkaline conditions (pH = 14). Electrochemical impedance spectroscopy studies reveal that compound 1has a charge transfer resistance (Rct) of 2.927 Ω, which is comparatively lower than standard Co3O4(5.242 Ω), indicating rapid charge transfer kinetics between electrode and electrolyte solution that enhances higher catalytic activity toward OER kinetics. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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