Light-activated p–n heterojunction with dual cobalt sites enhances zinc–air battery performance (IMAGE)
Caption
Light-activated p–n heterojunction with dual cobalt sites enhances zinc–air battery performance. Schematic illustration of a photo-electroactive air cathode featuring a p–n heterojunction between g-C₃N₄ (n-type) and a Co-based carbon nanofiber framework (p-type) with dual cobalt active sites. The “bridge” structure composed of CNT-linked carbon nanofibers enables efficient charge transport, while light irradiation drives directional electron–hole separation across the heterojunction. Photogenerated electrons promote the oxygen reduction reaction (ORR), and holes accelerate the oxygen evolution reaction (OER), leading to reduced overpotentials and enhanced reaction kinetics. The voltage–current and power density curves highlight the markedly improved zinc–air battery output under light compared with dark conditions.
Credit
Tuo Lu
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CC BY-NC-ND