Researchers in Hong Kong Develop Steel That Slashes Hydrogen-Equipment Expenses by a Factor of 40

Exceptional Corrosion Resistance

According to НВ — Техно: Hydrogen is widely regarded as a key low-carbon fuel, but high equipment costs have slowed its adoption. A team at the University of Hong Kong, led by professor Mingxin Huang, has now designed a stainless steel grade named SS-H₂ that could change that. The alloy resists corrosion strongly enough to replace costly titanium in electrolyzers. With a dual passive layer built from chromium and manganese, SS-H₂ can tolerate voltages up to 1700 mV in seawater. Experts estimate that switching to this material would lower the price of structural components in electrolysis systems by roughly forty times.

Why SS-H₂ Stands Out

Traditional stainless steels rely on a chromium oxide film for protection, but that film breaks down around 1000 mV. Efficient water splitting requires more than 1600 mV, which is why conventional steels fail in these systems. In SS-H₂, manganese-an element long thought to harm corrosion resistance-forms an extra protective layer at about 720 mV. When tested in seawater electrolysis, the new steel performed similarly to titanium parts coated with platinum or gold.

A 10-megawatt proton-exchange-membrane system costs roughly 2.28 million US dollars (17.8 million Hong Kong dollars), and more than half of that price goes to structural components. The research team has filed patent applications in multiple countries and, together with a factory in mainland China, has already produced the first tons of SS-H₂ wire. The findings appeared in Materials Today under DOI 10.1016/j.mattod.2023.07.022.

This stainless steel can survive severe corrosion in seawater while making green hydrogen production far less expensive.

SS-H₂ could have a major impact on renewable energy because cheaper electrolyzer parts are essential for scaling up hydrogen production. - Materials Today

Lower material costs could make hydrogen technologies more accessible to industry, accelerating the shift toward cleaner energy. The work also highlights how materials science innovations remain central to building sustainable systems and combating climate change.

The development of innovative materials is crucial for advancing renewable energy technologies. In a related breakthrough, engineers have introduced a new alloy that boasts ten times the strength of traditional steel without suffering from brittleness. This advancement could further enhance the durability and efficiency of energy systems. For more on this remarkable alloy, check out the full story here.