Abstract
In this study, high-entropy spinel (FeCoNiMnAl)3O4 catalyst with a three-dimensional(3D) layered microflower structure assembled by nanosheets grown on Ni foam (NF) is synthesized for stable seawater oxidation. Density functional theory (DFT) calculations indicate that it has a strong charge transfer capability, thereby reducing the energy barrier and boosting the reaction. As a result, a low oxygen evolution reaction (OER) overpotential of 274 mV@50 mA cm−2 is achieved with a small Tafel slope of 47.79 mV dec−1 in 1 M KOH solution. Notably, DFT calculations further verify that it shows stronger adsorption of OH than Cl. As expected, the required overpotentials are still as low as 284 and 295 mV@50 mA cm−2 in alkaline simulated seawater and natural seawater electrolytes. Also, it exhibits excellent stability and corrosion resistance, maintaining stable OER activity over 50 h at 500 mA cm−2 in alkaline natural seawater, which has the potential to realize industrial electrochemical seawater splitting.
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