The energy demands of the world are ever increasing. In our quest for clean and eco-friendly energy solutions, transportable hydrogen energy offers considerable promise. In this regard, proton exchange membrane water electrolyzers (PEMWEs) that convert excess electric energy into transportable hydrogen energy through water electrolysis have garnered remarkable interest.
However, their widescale deployment for hydrogen production remains limited due to slow rates of oxygen evolution reaction —an important component of electrolysis—and high loading levels of expensive metal oxide catalysts, such as iridium and ruthenium oxides, in electrodes. Therefore, developing cost-effective and high-performance OER catalysts is necessary for the widespread application of PEMWEs.
Recently, a team of researchers from Korea and U.S., led by Professor Chanho Pak from Gwangju Institute of Science and Technology in Korea, has developed a novel mesoporous tantalum oxide -supported iridium nanostructure catalyst via a modified formic acid reduction method that achieves efficient PEM water electrolysis.. The study was co-authored by Dr. Chaekyung Baik, a post-doctoral researcher at Korea Institute of Science and Technology .
Additionally, X-ray photoelectron and X-ray absorption spectroscopies revealed strong metal–support interaction between Ir and Ta, while density functional theory calculations indicated a charge transfer from Ta to Ir, which induced the strong binding of adsorbates, such as O and OH, and maintained Ir ratio in the oxidative OER process. This, in turn, led to the enhanced activity of Ir/Ta
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