NTU solar 'leaf' makes hydrogen while purifying seawater of hydrazine

Researchers at Nanyang Technological University in Singapore built a device combining a solar cell, electrolyzer and wastewater treatment system. It produces hydrogen from seawater at 466 μmol per square centimeter per hour and cuts hydrazine from 0.5 M to 0.5 ppb in about 30 hours.

• Hydrogen output reaches 466 μmol/cm² per hour with no external power
• Hydrazine drops from 0.5 M to 0.5 ppb in ~30 hours, versus EPA's 10 ppb limit
• The device ran stably for over 72 hours without significant performance loss
• The perovskite photocathode delivered a photocurrent density of about 25 mA/cm²