期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 50, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202003862
关键词
hierarchical nanoturf structures; micro-through hole membranes; nanoturf structures; solar-vapor generation
类别
资金
- Brain Research Program of the National Research Foundation - Korean government [NRF-2019M3C7A1032076]
- KIST institutional research programs [2E30120, 2V07870]
- National Research Foundation of Korea [2E30120, 2019M3C7A1032076] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Solar-thermal materials have been intensively studied in the context of production and localization of thermal energy, targeting an industry level application. Although photonic and optical strategies for enhancing light absorption have increased the efficiency of photo excitation/conversion into thermal energy, most of them have several limitations such as large area fabrication, thermal stability and broadband/omnidirectional light absorption. In this study, a gold-coated hierarchical nanoturf membrane (Au/h-Nanoturf membrane) incorporated with randomly distributed high aspect ratio (AR) nanostructures and micro-through holes is proposed. The Au/h-Nanoturf has peculiar black structures that provide advantages in forming a membrane with a large area and in absorbing broadband solar light spectrum. Furthermore, the membrane is combined with micro-cone array which makes it exhibit exceptionally omnidirectional light absorption properties. Using computational analysis, it is confirmed that the micro-cone array substantially contributes to the omnidirectional solar absorption irrespective of the wavelength. The optimized structural parameters for the maximum efficiency of the solar-thermal materials are also found. The prepared solar-vapor generator with the optimized structural features exhibits 91% average conversion efficiency under one sun condition. The efficiency is sustainable for up to four weeks. The highly efficient and omnidirectional broadband-absorbing solar-thermal membrane can be readily employed, targeting an industry level application.
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