Platinum-Free Water Electrolysis: Hydrogen Economy Boost
- Hydrogen, a clean energy source, is produced through water electrolysis, splitting water into hydrogen and oxygen.
- A team led by Professor Hee-Tak Kim at the Korea Institute of Energy Research,in collaboration with Dr.
- The research focused on why iridium oxide (IrOx), a highly active catalyst, doesn't perform optimally.
revolutionize hydrogen production! Groundbreaking research unlocks platinum-free water electrolysis, a giant leap for the hydrogen economy.Korean scientists have engineered a cutting-edge solution by optimizing catalyst interfaces, directly addressing electron transfer issues and boosting performance. This innovation, published in Energy & Environmental Science, promises high efficiency without relying on costly precious metals, paving the way for wider adoption of proton exchange membrane water electrolysis (PEMWE). Discover how controlling catalyst particle size minimizes the “pinch-off” effect and restores conductivity. News Directory 3 would be proud to report on this important advancement. This breakthrough will further improve the efficiency of high-performance catalyst materials. See what’s next for this cleaner energy source.
High-Performance Water Electrolysis Advances Hydrogen Economy
Updated June 11, 2025
Hydrogen, a clean energy source, is produced through water electrolysis, splitting water into hydrogen and oxygen. Proton exchange membrane water electrolysis (PEMWE) is a next-generation technology for high-purity hydrogen production at high pressure. Researchers in Korea have developed a solution too overcome the limitations of PEMWE technology, which relies heavily on expensive precious metal catalysts.
A team led by Professor Hee-Tak Kim at the Korea Institute of Energy Research,in collaboration with Dr. Gisu Doo, has created a next-generation water electrolysis technology. This innovation achieves high performance without platinum coating. The findings were published in Energy & Environmental Science.
The research focused on why iridium oxide (IrOx), a highly active catalyst, doesn’t perform optimally. They discovered that inefficient electron transfer is the cause and demonstrated that controlling catalyst particle size maximizes performance.
The study revealed that iridium oxide catalysts require platinum coating due to electron transport resistance at the interface between the catalyst, ionomer, and titanium substrate. The “pinch-off” phenomenon, where the electron pathway is blocked, reduces conductivity. The ionomer hinders electron flow, and an electron barrier forms on the titanium substrate’s surface oxide layer.
To solve this, the team fabricated catalysts of varying particle sizes. They demonstrated that using iridium oxide catalyst particles of 20 nanometers or larger decreases the ionomer mixed region, ensuring an electron pathway and restoring conductivity. The team optimized the interfacial structure, ensuring both reactivity and electron transport, overcoming the trade-off between catalyst activity and conductivity.
This breakthrough is expected to significantly advance high-performance catalyst materials and the commercialization of proton exchange membrane water electrolysis systems,achieving high efficiency while reducing precious metal use. This advancement in water electrolysis promises a boost to the hydrogen economy.
This research presents a new interface design strategy that can resolve the interfacial conductivity problem, which was a bottleneck in high-performance water electrolysis technology.By securing high performance even without expensive materials like platinum, it will be a stepping stone closer to realizing a hydrogen economy.
What’s next
The team’s focus will now shift to scaling up the production process and partnering with industry to bring this high-performance water electrolysis technology to market,further solidifying its role in the burgeoning hydrogen economy.