石墨烯纳米颗粒包裹的灯芯材料对太阳能蒸汽产生的效率提高
Efficiency enhancement on the solar steam generation by wick materials with wrapped graphene nanoparticles
摘要：
太阳能蒸汽发生技术可以利用丰富的和可再生的太阳能用于许多应用。在这项工作中，我们提出了一个太阳能蒸汽发生器使用灯芯材料与包裹石墨烯纳米粒子，和能量效率可以达到80%。采用化学包裹法代替传统的涂抹法，使石墨烯纳米颗粒更好地附着在灯芯材料上。通过SEM形貌观察结果表明，石墨烯纳米颗粒均匀地包裹在芯材的纤维上，具有较好的分散性和稳定性。对比分析了不同条件下三种吸液芯材料的蒸发速率、瞬时能量效率和吸收率。在三种不同的芯材料中，具有密集的细毛的法兰绒布可以提供用于包裹石墨烯纳米颗粒的三维接触区域，从而有助于更好地蒸发。此外，还讨论了两种不同的还原方法和不同浓度的氧化石墨烯溶液对能量效率的影响。我们的工作提供了一个简单而有效的方法，使用纳米技术在太阳能蒸汽发电的实际应用。
英文摘要：
Solar steam generation technology can utilize abundant and renewable solar energy for many applications. In this work, we proposed a solar steam generator using wick material with wrapped graphene nanoparticles, and the energy efficiency can reaches up to 80%. Instead of traditional smearing method, the chemical wrapping method was used to better adhere the graphene nanoparticles on the wick materials. Through the SEM morphological results, the graphene nanoparticles are shown to be evenly wrapped across the fibres of the wick material, which have better dispersity and stability. The evaporation rate, instantaneous energy efficiency and the absorptivity of three wick materials with/without nanoparticles under different conditions were compared and analyzed. Among the three different wick materials, the flannel cloth with dense fine hairs can provide three-dimensional contact area for wrapping graphene nanoparticles and thus contribute to better evaporation. Additionally, the influence of two different reduction methods and different concentrations of graphene oxide solution on the energy efficiency was also discussed. Our work offers a simple and effective way of using nanotechnology in practical application for solar steam generation.
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