Abstract
The water exfoliation strategy is utilized to synthesize ultrathin monolayers of 2-dimensional cobalt-iron-layered double hydroxide nanosheets (CFL-NS) for application in the electrocatalytic oxygen evolution reaction (OER). These nanosheets exhibit a hexagonal crystal structure, and their zeta potential varies between +30 mV and +36 mV, depending on the Co:Fe ratio. The electron microscopy analysis reveals aggregated ultrathin nanosheets with a lateral size of ∼75 nm and the formation of very small nanoparticles due to the tearing of CFL-NS. The bulk CFL and CFL-NS with Co:Fe ratio of 3:1 demonstrate outstanding OER performance, with an overpotential of 305 and 299 mV at a current density of 10 and 25 mA cm−2, respectively. Additionally, they exhibit a high electrochemical active surface area (ECSA) of 8.5 cm2, a Tafel slope of 47 mV dec−1, and excellent electrocatalytic stability during a chronoamperometric test of 24 h. This study underscores the benefits of an aqueous LDH exfoliation strategy for achieving enhanced electrocatalytic performance of CFL-NS.
Published Version
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