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Enhancing efficiency of interfacial solar steam generation with biomimetic hierarchical porous graphene activated by NaOH

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Abstract

Interfacial solar steam generation (ISSG) provides a low-cost and green route to produce clean drinking water, meeting the urgent demand in remote and off-grid regions. To fabricate high-efficiency ISSG devices, researchers have harnessed graphene as an effective photothermal material of ISSG devices. However, the intricate fabrication and pristine hydrophobicity of graphene still limits the efficiency of ISSG devices. In this work, we present an approach to enhance the efficiency of ISSG using biomimetic hierarchically porous laser-induced graphene (LIG), activated by NaOH. The method involves a one-step laser processing of polyimide films accompanied by NaOH activation, creating porous graphene structures with enhanced water wicking and evaporation rates. The optimal sample, activated by 5 M NaOH solution, exhibited superior evaporation performance at 2.41 kg/(m2·h) under one-sun irradiation. This advancement offers a promising avenue for cost-effective and efficient ISSG devices.

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