Tests reveal why titanium additions do not fully prevent pitting corrosion in stainless steel - Phys.org

image: A schematic illustrates how FeSn-DSACs use p-d orbital hybridization and a locally negatively charged interface to accelerate ORR while limiting Cl−-induced poisoning of Fe active sites in alkaline seawater. SZABs are attractive for marine energy supply because they are safe, potentially high in energy density and can use abundant seawater as the electrolyte. Yet seawater also brings a problem. At the air cathode, the ORR is slow, and Cl− in seawater can adsorb on Fe active sites, blocking the reaction and accelerating catalyst corrosion.

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A stainless steel breakthrough from the University of Hong Kong (HKU) could help solve one of the biggest problems facing green hydrogen: how to build electrolyzers that are tough enough for seawater, yet cheap enough for large scale clean energy. Led by Professor Mingxin Huang in HKU's Department of Mechanical Engineering, the team developed a special stainless steel for hydrogen production (SS-H2). The material resists corrosion under conditions that normally push stainless steel past its limits, making it a promising candidate for producing hydrogen from seawater and other harsh electrolyzer environments.

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