Enhancing electrochemical performance and corrosion resistance of nickel-based catalysts in seawater electrolysis: focusing on OER and HER

Hydrogen production by electrochemical hydrogen evolution reaction (HER) using eco-friendly seawater electrolysis can help address the energy shortage. However, insoluble precipitates form from elements of magnesium, calcium, and chlorine ions with the oxygen evolution reaction (OER) will cause electrode degradation. Currently, commercially viable catalysts are mostly comprised of precious metal Pt-based catalysts, which are expensive and limited in availability. The critical factor for hydrogen production from seawater electrolysis is the development of highly efficient and corrosion-resistant catalysts. Nickel-based electrocatalysts, which are cost-effective with conductivity and corrosion resistance, are a prospective substitute for precious metal catalysts. This review summarizes contemporary methods and ideas for improving the performance of nickel-based electrocatalysts and stability for HER and OER in seawater, focusing on strengthening electrochemical performance and corrosion resistance. It is a comprehensive resource for advancing nickel-based electrocatalysts in seawater electrolysis, guiding the development of more efficient electrocatalysts and bolstering long-term reliability and stability in seawater environments.