Abstract
Quaternary layered double hydroxides (LDHs) are emerging as effective oxygen evolution reaction (OER) electrocatalysts for alkaline water splitting. In this work, NiCoMnFe-LDH has been successfully fabricated using leachate from recycled battery cathodes, demonstrating a sustainable approach to resource utilization. By incorporating varying amounts of Vulcan XC72 carbon as a support, we improved the conductivity of the NiCoMnFe-LDH. Our results indicate that the addition of Vulcan XC72 enhances the electrocatalytic performance of the nanocomposites. Notably, the NiCoMnFe-LDH/C-50 sample exhibited superior OER activity, with an overpotential of 329 ± 10 mV at a current density of 10 mA cm⁻2 and stable performance over 15 h. Detailed characterization confirmed the advantages of the carbon support in improving both the structural stability and catalytic efficiency. This work may pave the way to a sustainable method for repurposing spent battery cathodes, advancing the development of cost-effective and environmentally friendly electrocatalysts for clean energy applications.
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