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Synthesis of ethane-disulfonate pillared layered cobalt hydroxide towards the electrocatalytic oxygen evolution reaction.
- Source :
-
Dalton Transactions: An International Journal of Inorganic Chemistry . 2/21/2023, Vol. 52 Issue 7, p2115-2123. 9p. - Publication Year :
- 2023
-
Abstract
- We report the synthesis of a hybrid layered cobalt hydroxide sample and its redox behaviors in the electrochemical oxygen evolution reaction (OER). Compound Co7(OH)12(C2H4S2O6)·1.6H2O was synthesized via a homogeneous alkalization reaction using Co(SO3C2H4SO3) and hexamethylenetetramine. This compound comprises cationic host layers of {[Co7(OH)12]2+}∞, which comprise octahedrally (CoOh) and tetrahedrally (CoTd) coordinated Co cations at a CoOh : CoTd ratio of 5 : 2. The ethane-disulfonate ions are combined with the cationic host layers by electrostatic attractions and hydrogen bonding as a hybrid pillared layered framework. This hybrid sample can promote the OER in 1 M KOH with an overpotential as low as ∼410 mV (at a current density of 10 mA cm−2). In situ Raman spectroscopy showed that the sample first evolved into Co(III)-based phases comprising a mixture of layered CoOOH and spinel Co3O4, and the Co(III)-based compounds were converted into Co(IV)–O intermediates containing [CoO6] units at the onsite of the OER. The structural evolution behaviors suggest that the catalyst prefers a topotactic phase transition and the CoOh and CoTd units exhibit different activities in the electrochemical reaction. The electron transfer events involved in the electrochemical reaction were identified by Fourier-transformed alternating current voltammetry. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 52
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 161876770
- Full Text :
- https://doi.org/10.1039/d2dt03358e