Abstract
Due to geographical restrictions, water and electricity shortages have always been crucial problems in remote areas. Among the numerous potential solutions, the fog harvesting technique using a film has been recognized as one of the effective methods for water collection in dry regions. In this study, researchers drew inspiration from desert beetles in nature to fabricate a biomimetic chitosan hydrophilic array coated on a hydrophobic PVDF/graphene (PG) film that is capable of efficient fog water harvesting, reaching an efficiency of up to 0.63 LMH. Graphene and an ionic liquid (IL) were used to synergistically induce the self-assembly of PVDF crystalline phases into a piezoelectric β-phase, and the resulting optimized PG/IL1.5 wt% film could have a voltage output of up to 13 V (±6.5 V). Upon conducting an integrated assessment of water and electricity extraction from the film, and the results indicated a water collection efficiency of 0.74 LMH and a power generation of 99.2 mW/m2 at a fog wind speed of 4 m/s. Based on the aforementioned research findings, we have demonstrated that a single film utilizing fog and wind as driving forces can achieve simultaneous water and electricity production, providing new research directions for the development of next-generation functional films in the future.
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