SSH2Image Source: Oreaco

Unveiling SS-H2: Steel's Silent Revolution


Scientists at the University of Hong Kong introduce SS-H2, a game-changing stainless steel designed for hydrogen production. Boasting superior corrosion resistance over Titanium, this innovation holds the promise of drastically reducing costs in water electrolyzers. Professor Mingxin Huang's 'Super Steel' Project achieves another milestone, presenting a solution for affordable hydrogen production from renewable sources, potentially reshaping the industry.



In a groundbreaking development, a team led by Professor Mingxin Huang at the University of Hong Kong's Department of Mechanical Engineering has ushered in a new era for stainless steel with the introduction of SS-H2, specifically engineered for hydrogen applications.

Professor Huang's team, known for their previous achievements in anti-COVID-19 stainless steel and ultra-strong Super Steel, has now set their sights on revolutionizing stainless steel for hydrogen production. The recently unveiled SS-H2 exhibits remarkable corrosion resistance, positioning it as a viable alternative to Titanium in applications like water electrolysis for hydrogen production.

The breakthrough, part of Professor Huang's ongoing 'Super Steel' Project, addresses a crucial need in the field of green hydrogen production. The team's innovation opens avenues for cost-effective hydrogen production from renewable sources, with potential applications extending to seawater electrolysis, a sustainable solution still in its infancy.

The team's findings, published in the journal Materials Today, highlight the new steel's performance in saltwater electrolyzers, showcasing comparable results to industrial practices employing Titanium. What sets SS-H2 apart is its significantly lower cost, making it an economically attractive option for structural components in hydrogen production processes.

Traditional stainless steel has long relied on chromium for corrosion resistance, but SS-H2 transcends this limitation. Employing a "sequential dual-passivation" strategy, the research team introduced a secondary manganese-based layer, enhancing corrosion resistance. This innovative mechanism prevents corrosion in chloride media up to an ultra-high potential of 1700 mV, marking a fundamental breakthrough.

The unexpected discovery of manganese-based passivation, contrary to conventional wisdom, adds an intriguing layer to the project. Dr. Kaiping Yu, the first author of the article, expressed the team's initial disbelief and subsequent excitement, noting the counter-intuitive nature of the discovery.

The journey from initial discovery to scientific breakthrough took nearly six years, during which the team meticulously navigated challenges and unveiled a stainless steel variant with the potential to transform the hydrogen production landscape. Professor Huang emphasized the team's focus on developing high-potential-resistant alloys, overcoming the limitations of conventional stainless steel.

The practical implications are significant, especially in water electrolyzers where expensive materials like gold- or platinum-coated Titanium are currently essential. Professor Huang's team envisions replacing these costly structural components with the more economical SS-H2, potentially reducing structural material costs by about 40 times.

As the project moves towards industrial applications, including the production of SS-H2-based wire, the team anticipates a substantial impact on hydrogen production from renewable sources. The breakthrough brings the scientific community closer to realizing more economical and sustainable solutions in the quest for green hydrogen.


In conclusion, the unveiling of SS-H2 marks a silent revolution in the realm of stainless steel, particularly tailored for hydrogen applications. Professor Huang's team's meticulous research, spanning nearly six years, has resulted in a stainless steel variant with unparalleled corrosion resistance and cost-effectiveness. The counter-intuitive discovery of manganese-based passivation challenges existing norms and opens new avenues for high-potential-resistant alloys. As the project transitions towards industrial applications, the prospect of cost-effective hydrogen production from renewable sources becomes increasingly tangible, signifying a transformative leap in sustainable technology.

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