Design of New Process for Anchoring Carbon Quantum Dots onto the Cobalt Oxyhydroxide Surface for Efficient Oxygen Generation

Abstract

The oxygen evolution reaction (OER) is a critical energy conversion process in water-splitting technologies, but its efficiency is hindered by high overpotential and sluggish kinetics. This study introduces a novel synthesis method for anchoring carbon quantum dots (CQDs) onto cobalt oxyhydroxide (CoOOH) to enhance the performance of the OER. The CoOOH/CQDs composite demonstrates superior electrocatalytic activity with a reduced overpotential of 370 mV at a current density of 10 mA/cm² and a low Tafel slope of 88 mV/decade, indicating improved reaction kinetics. The integration of CQDs enhances the electronic properties of the composite, serving as both electron donors and acceptors, thereby facilitating efficient charge transfer during the OER process. Additionally, the catalyst exhibits excellent long-term stability, retaining its performance over 72 h of continuous operation. Due to its cost-effectiveness, high efficiency, and durability, the CoOOH/CQDs composite holds significant promise as a next-generation electrocatalyst for OER applications, contributing to the development of sustainable energy technologies.