Interface-Sensitive photoelectrochemical enhancement in ultrathin Metal-Organic Framework-derived Mn3O4 Zinc-Ion battery cathodes

초록

Harnessing light to modulate electrochemical processes offers a new strategy for advanced energy storage. Here, we report a photoresponsive zinc-ion battery using an ultrathin Mn3O4 cathode derived from Mn(BTC) [BTC = 1,3,5-benzenetricarboxylic acid] via additive-free alternating current electrophoretic deposition. This binderand conductive agent-free architecture provides a clean, interface-sensitive platform for probing light-electrode interactions. Under blue light (450 nm), the Mn3O4 electrode delivers over a tenfold capacity increase-from 200 mAh/g to 2000 mAh/g-along with a pronounced rise in cyclic voltammetry current. Notably, much of this enhancement persists after illumination, indicating a long-lived photoactivation effect. This work represents the first observation of light-induced capacity amplification in Mn(BTC)-derived Mn3O4 electrodes, offering a promising route toward light-tunable aqueous batteries.

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