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A Flexible Tough Hydrovoltaic Coating for Wearable Sensing Electronics, Advanced Materials, doi.org/10.1002/adma.202304099.

Lianhui Li#; Zhuo Zheng#; Changlei Ge; Yongfeng Wang; Hao Dai; Lili Li; Shuqi Wang; Qiang Gao; Mengyuan Liu; Fuqin Sun; Ting Zhang*;

Abstract

The lack of strong binding mechanism between nanomaterials severely restricts the advantages of evaporation-driven hyhrovoltaic effect in wearable sensing electronics. It's a challenging task to observably improve the mechanical toughness and flexibility of hyhrovoltaic devices to match the wearable demand without abandoning the nanostructures and surface function. Here, we developed a flexible tough PAN/Al2O3 hydrovoltaic coating with both good electricity generation (open circuit voltage∼3.18 V) and sensitive ion sensing (2285 V M−1 for NaCl solutions in 10−4-10−3 M) capabilities. The porous nanostructure composed of Al2O3 nanoparticles is firmly locked by the strong binding effect of PAN, giving a critical binding force 4 times than that of Al2O3 film to easily deal with 9.92 m s−1 strong waterflow impact. Finally, skin-tight and non-contact device structures were proposed to achieve wearable multifunctional self-powered sensing directly using sweat. The flexible tough PAN/Al2O3 hydrovoltaic coating breaks through the mechanical brittleness limitation and broadens the applications of evaporation-induced hydrovoltaic effect in self-powered wearable sensing electronics.

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URL: https://onlinelibrary.wiley.com/doi/10.1002/adma.202304099#:~:text=The%20flexible%20tough%20PAN%2FAl%202%20O%203%20hydrovoltaic,evaporation-induced%20hydrovoltaic%20effect%20in%20self-powered%20wearable%20sensing%20electronics.