Exploring seawater oxidation potential using a MnCoCr layered double hydroxide@sulphur doped carbon dot/nickel foam electrocatalyst in an alkaline environment

Abstract

To find sustainable energy solutions, it is essential to explore electrocatalysts that are both efficient and robust in obtaining energy and making use of seawater. This study introduces a promising electrocatalyst, MnCoCr LDH@SCDs/NF, which is created by integrating sulphur-doped carbon dots (SCDs) into the layers of MnCoCr layered double hydroxides (LDHs) and drop casting them onto a nickel foam substrate. This novel approach aims to enhance the performance of the oxygen evolution reaction (OER) under alkaline seawater conditions. MnCoCr LDH@SCDs/NF showcases exceptional electrocatalytic capabilities in alkaline environments, effortlessly achieving a significant current density of 10 mA cm⁻² with an impressively low overpotential of only 225 mV. These remarkable results were attributed to the strategic inclusion of SCDs within MnCoCr LDH layers, effectively functioning as efficient channels for transporting electrons. Because these sulphur-doped carbon dots contain many negatively charged functional groups, they effectively repel undesirable chlorine anions present in seawater during electrolysis. This innovative design not only enhances intrinsic catalytic activity but also provides a substantial specific surface area. This investigation underscores the potential of MnCoCr LDH@SCDs/NF as a strategic route for the development of high-performance electrocatalysts with exceptional stability. Such breakthroughs hold great promise in advancing the utilization of renewable energy harnessed from seawater sources.