Researchers from Kumamoto University and Hiroshima University have announced a significant development in hydrogen ion barrier films using graphene oxide (GO) without internal pores. This approach could be beneficial for protective coatings for various applications.
In their study, the research team successfully synthesized and developed a pore-free GO (Pf-GO) membrane with controlled oxygen functional groups. Traditionally, GO has been known for its high ionic conductivity, which made it challenging to use as an ion barrier. However, by eliminating the internal pores, the team created a material with dramatically improved hydrogen ion barrier properties.
The new graphene oxide film exhibits up to 100,000 times better hydrogen ion barrier performance compared to conventional GO films, based on the AC impedance spectroscopy 's out-of-plane proton conductivity result. Proton permeation tests conducted in aqueous solution demonstrated that proton permeation is below the detection limit, and lithium metal foils coated with the Pf-GO show higher chemical stability to water than those coated with previously reported GO. The Pf-GO has periodic honeycomb atomic structure, which is found to impart the Pf-GO membrane with novel performance characteristics distinct from those of conventional GO.
This advancement opens doors to new applications in protective coatings, rust prevention, and hydrogen infrastructure.
This research could pave the way for next-generation coatings with enhanced protective properties. The team stated that it plans to harness the hydrogen ion barrier performance for practical applications, while also addressing the challenges posed by the 'pores' in the GO structure to unlock additional functionalities.
