NTU artificial leaf advances green hydrogen production from seawater while tackling hydrazine contamination

Researchers at Nanyang Technological University in Singapore have introduced an innovative self-powered artificial leaf that harnesses sunlight to generate hydrogen from electrolytes found in seawater, all while breaking down hydrazine, which is a toxic industrial chemical. This clever little device combines photoelectrochemical technology—a lead-halide perovskite photocathode paired with an iron-cobalt-chromium oxide catalyst—into one sleek module that tackles both green hydrogen production and wastewater treatment in a single swoop.

What’s cool about this system is that it doesn’t need an external power source; it gets its energy directly from sunlight. When sunlight hits the perovskite photocathode, it kicks electrons into high gear, sending them racing to the cathode-electrolyte interface where they work their magic to convert water into hydrogen gas. At the same time, those “holes” left behind in the photocathode drive oxidation at the anode, but instead of the usual energy-guzzling oxygen evolution reaction, this nifty device goes for hydrazine oxidation. This clever move not only reduces energy needs but also sidesteps the harmful chlorine production that often messes things up in direct seawater electrolysis.

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