Engineers just demonstrated a hydrogen combustion engine that extracts its fuel directly from atmospheric water vapor - running continuously on humidity alone with zero carbon emissions and zero external fuel supply required.
A team from the Korea Institute of Energy Research developed an atmospheric water harvesting system using metal-organic framework sorbents that extract water vapor from air at humidities as low as 20% - capturing 4.7 liters of water per kilogram of sorbent material per day.
This water feeds a solid oxide electrolyzer splitting it into hydrogen and oxygen using 2.3 kilowatts of electrical input from integrated solar panels. The hydrogen powers a modified combustion engine producing 8.7 kilowatts of continuous mechanical output — a net energy gain of 6.4 kilowatts from atmospheric humidity alone.
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