隨著人口增加、工業發展，對水和能源的需求也不斷增加。在許多發展中國家與乾旱地區，水資源與能源的短缺因全球暖化的影響已逐漸加劇。收集霧氣中的水分被認為是一種解決水資源短缺的方法，空氣流動所產生的風更是一種無汙染、永續的能源。然而目前霧收集以獲得乾淨、可飲用的水資源為主，鮮少有人
結合風力發電，進行同時產水發電之應用。
本研究受自然界中沙漠甲蟲的啟發，設計並製備了一種能同時取水發電的仿生霧收集石墨烯壓電薄膜，能靠自然界的霧氣取水同時依靠自然界的風來發電。本研究將 PVDF 與石墨烯以及離子液共混，藉由添加石墨烯增加薄膜導電性，並利用離子液誘導 PVDF 結晶由α相結晶自組裝成具有壓電性質的β相結晶，製備出 PVDF-石墨烯/離子液壓電薄膜，XRD 的結果顯示加入離子液之後 PVDF 中的結晶峰由 20.1°α相轉換成 20.6°的β相結晶。接著，我們選用三種親水性高分子聚乙烯醇、幾丁聚醣、海藻酸鈉與一種疏水高分子聚二甲基矽氧烷，利用網版印刷在石墨烯壓電薄膜表面塗布不同陣列尺寸的高分子陣列仿生結構，並探討不
同陣列尺寸與高分子的親疏水性對霧氣水收集效率的影響。
實驗結果指出，離子液添加量為 1.5wt%的壓電薄膜具有最好的壓電性能，電壓輸出可達 6.5 伏特。我們發現以幾丁聚醣做為塗佈的親水陣列材料，在陣列網點直徑為 0.2 mm 的尺寸下所獲得的水收集效率最佳，高達 0.63 LMH。基於上述的最適化發電與水收集效率的薄膜，我們進行了整合的可行性評估，發現在 4 m/s 的風速下，水收集效率為 0.74 LMH、平均發電功率為 163.09 nW。
基於上述研究結果，我們證實了單一薄膜利用霧跟風作為驅動，達到同時產水與產電的目的，這對於未來開發次世代功能性薄膜提供新的研究方向。

As the world’s population increases and industries develop, so does the demand for water and energy. In many developing countries and arid regions, water and energy
shortages have been exacerbated by the effects of global warming. Harvesting moisture
from mist is considered a solution to water shortages, and wind generated by air
movement is a pollution-free, sustainable energy source. However, at present, fog
collection is mainly used to obtain clean and drinkable water resources, and few people combine wind power generation for the application of simultaneous water production and power generation.
Inspired by desert beetles in nature, this study designed and fabricated a
biomimetic fog-collecting graphene piezoelectric membrane that can simultaneously
produce water and generate electricity. It can draw water from natural fog and generate electricity by relying on natural wind.
In this study, PVDF was blended with graphene and ionic liquid. Graphene was
added to increase the conductivity of the membrane and the ionic liquid induced PVDF
crystallization to self-assemble from α-phase crystals to β-phase crystals with
piezoelectric properties, resulting to a PVDF- graphene/ionic liquid piezoelectric
membrane. XRD results show that the crystallization peak in PVDF is transformed from
20.1° α phase to 20.6° β phase crystal after adding ionic liquid.
Next, we selected three hydrophilic polymers: poly(vinyl alcohol) (PVA), chitosan,
sodium alginate; and one hydrophobic polymer: polydimethylsiloxane (PDMS), and
they were coated on the graphene piezoelectric membrane surface with different array
sizes by screen printing. The biomimetic structure of the polymer array was investigated, as well as the effect of different array sizes and the hydrophilicity and hydrophobicity of the polymer on the collection efficiency of fog water.
The experimental results show that the piezoelectric membrane with the addition of 1.5wt% ionic liquid has the best piezoelectric performance and the voltage output
can reach up to 6.5V. We found that the hydrophilic array material coated with chitosan achieved the best water collection efficiency of up to 0.63 LMH at the size of the array dot diameter of 0.2 mm.
Based on the above-mentioned membranes optimized for efficient power generation and water collection, we performed an integrated feasibility assessment and found that at a wind speed of 4 m/s, the water collection efficiency was 0.74 LMH and the average power generation was 163.09 nW.
Based on the above research results, we confirmed that a single membrane uses fog to follow the wind as a driving force to achieve the purpose of producing water and generating electricity at the same time, which provides a new research direction for the development of next-generation functional membranes in the future.

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