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Researchers from the University of Sydney have developed a method to produce green hydrogen directly from seawater using liquid gallium and sunlight. The technique, detailed in Nature Communications, operates without the need for electricity or purified water, allowing for large-scale production even in areas with limited freshwater.

The process is circular, as gallium can be recycled, and achieves a maximum efficiency of 12.9%. This innovation could significantly impact hydrogen production, especially in coastal regions and countries with scarce freshwater resources.