Revolutionary SS-H2 steel could slash green hydrogen production costs by 97%

A breakthrough in steel technology could cut costs for green hydrogen production. Researchers at the University of Hong Kong (HKU) have developed SS-H2, a stainless steel far more resistant to corrosion than existing materials. The discovery may speed up the shift to cleaner energy by making seawater electrolysis far more affordable. The project began under Professor Mingxin Huang, who leads HKU’s Super Steel initiative. His team spent nearly six years refining SS-H2, which uses a dual-layer passivation method. Unlike standard stainless steel—prone to failure near 1000 millivolts—SS-H2 withstands up to 1700 mV, well above the 1600 mV threshold needed for water oxidation.

Traditional green hydrogen systems rely on titanium parts, which make up over half the cost of a 10-megawatt PEM electrolysis setup. Replacing titanium with SS-H2 could slash material expenses by around 40 times. The steel’s enhanced durability comes from adding manganese, a move that defies conventional metallurgical wisdom. Dr. Kaiping Yu, the study’s first author, published the findings in *Materials Today*. The team has already produced tons of SS-H2 wire and secured two patents, with more applications pending worldwide.

SS-H2’s corrosion resistance and lower cost could make green hydrogen more competitive against fossil-based alternatives. The steel’s performance in seawater electrolysis may also reduce reliance on expensive titanium components. If adopted widely, the technology could help scale up clean hydrogen production faster.