Researchers in South Korea have developed an advanced liquid metal catalyst incorporating selenium to enhance turquoise hydrogen production efficiency. Turquoise hydrogen, generated via methane pyrolysis, produces hydrogen while yielding solid carbon as a byproduct without emitting carbon dioxide. Dr. Seung Ju Han's team at the Korea Research Institute of Chemical Technology introduced selenium-doped molten metal catalysts (NiBi, CuBi) to improve methane pyrolysis efficiency, achieving high conversion rates and stable performance. The ternary molten metal catalyst incorporating selenium addresses challenges faced by solid catalysts, enabling efficient carbon separation and stable reactions. Selenium reduces surface tension, enhancing reactant-catalyst contact and lowering activation energy for methane conversion, boosting catalytic performance. The newly developed selenium-promoted ternary catalysts (NiBiSe, CuBiSe) showed significant efficiency improvements in methane-to-hydrogen conversion. Notably, the NiBiSe catalyst exhibited stable performance over 100 hours. The technology is viewed as a key innovation for carbon-free turquoise hydrogen production, poised to accelerate commercialization and contribute to achieving carbon neutrality. The researchers aim to further enhance efficiency and target commercial deployment by 2030.