Department of Chemical Engineering, Hanyang University, Seoul, 04763, Republic of Korea.
Adv Sci (Weinh). 2023 May;10(13):e2207415. doi: 10.1002/advs.202207415. Epub 2023 Feb 24.
As one of the effort to cope with the energy crisis and carbon neutrality, utilization of low-grade energy generated indoors (e.g., light) is imperative because this saves building and house energy, which accounts for ≈40% of total energy consumption. Although photovoltaic devices could contribute to energy savings, it is also necessary to harvest heat from indoor lights to generate electricity because the light absorbed by materials is mostly transformed into heat. For daily life uses, materials should not only have high absorptance and low emittance but also be easily processed into various forms. To this end, this work synthesizes black aqueous suspensions containing winding and bent linear gold nanostructures with diameters of 3-5 nm and length-to-diameter ratios of ≈4-10. Their optical and photo-thermal characteristics are understood through experimental and theoretical investigations. Black gold nanostructures are conveniently processed into metal-dielectric films on metal, glass, and flexible substrates. The film on copper has an absorptance of 0.97 and an emittance of 0.08. Under simulated sunlight and indoor LED light illumination, the film has equivalent photo-thermal and photo-thermoelectric performances to a top-tier sunlight-collecting film. This work attempts to modify the film structure to generate more usable electricity from low-energy indoor light.
作为应对能源危机和碳中和的努力之一，利用室内产生的低品位能源（例如光）是必要的，因为这可以节省建筑和房屋能源，占总能源消耗的 ≈40%。虽然光伏器件可以有助于节能，但也有必要从室内灯光中收集热量来发电，因为材料吸收的光大部分转化为热量。对于日常生活用途，材料不仅应具有高吸收率和低发射率，而且还应易于加工成各种形式。为此，这项工作合成了含有直径为 3-5nm 且长度与直径比约为 4-10 的缠绕和弯曲线性金纳米结构的黑色水性悬浮液。通过实验和理论研究了解了它们的光学和光热特性。黑色金纳米结构可以方便地加工成金属-电介质膜，应用于金属、玻璃和柔性基底上。在铜上的薄膜具有 0.97 的吸收率和 0.08 的发射率。在模拟阳光和室内 LED 光照射下，该薄膜的光热和光热电性能与顶级集光膜相当。这项工作试图通过修改薄膜结构，从低能量的室内光中产生更多可用的电能。
