Broadband solar‐driven water evaporator based on organic hybrid bandgap and bio‐mimetic interfaces
Broadband solar‐driven water evaporator based on organic hybrid bandgap and bio‐mimetic interfaces
复制标题
DOI：
10.1002/eom2.12323
复制
发表时间：
2023-02
期刊：
影响因子：
14.6
通讯作者：
Jingshuai Zhu;Xiang Wang;Jiechang Liang;X. Qiu;Shiguo Chen;Yu Wang;Yuanfeng Wang
中科院分区：
文献类型：
--
作者：
Jingshuai Zhu;Xiang Wang;Jiechang Liang;X. Qiu;Shiguo Chen;Yu Wang;Yuanfeng Wang
由于轻质、柔韧性和分子多样性，有机光热材料被认为是很有前途的水蒸发净化太阳能吸收材料。本文中，我们利用PM6和Y6两种有机共轭光热材料的混合物，具有350 - 1000 nm的宽带太阳能吸收和高效光热性能，在纤维素纸上制造了Janus水蒸发器。类似于荷叶的不对称润湿行为，蒸发器在底部表面表现出有效的水粘附性，在顶部表面表现出良好的自浮能力和耐盐性。PM6:Y6混合水蒸发器的质量仅为0.5 mg / 3.14 cm2，在1.0 kW m - 2太阳辐照下，其太阳能热转换效率（η）为88.9%，太阳能水蒸发率(m)为1.52 kg m - 2h - 1。这些性能在纯有机蒸发器中几乎是最好的，特别是在节约材料的前提下。脱盐后，原生离子浓度显著降低4 ~ 6个数量级，具有良好的废水处理性能。该蒸发器与热电设备配合使用，在一次太阳照射下，能达到1.21 kg m−2h−1，η为75.7%，电压为61 mV。本研究表明，PM6与Y6的共混实现了光热协同作用，提高了光热性能和水分蒸发速率，为其在水净化和热电发电方面的应用提供了宝贵的前景。
Owing to the lightweight, flexibility, and molecular diversity, organic photothermal materials are considered promising solar absorbent materials for water‐evaporating purification. Herein, we utilize the blend of two organic conjugated photothermal materials, PM6 and Y6, with broadband solar absorption from 350 to 1000 nm and high‐efficiency photothermal properties to fabricate a Janus water evaporator on cellulose paper. Similar to the asymmetric wetting behavior on the lotus leaf, the evaporator shows efficient water adhesion on the bottom surface and water repellency on the top surface for a desirable self‐floating capability and salt resistance. With a mass of only 0.5 mg per 3.14 cm2, the PM6:Y6 blend‐based water evaporator achieves 88.9% of solar thermal conversion efficiency (η) and 1.52 kg m−2h−1of solar water evaporation rate (m) under 1.0 kW m−2solar irradiation. These properties are almost the best performance among purely organic water evaporators especially with such a premise of material saving. The concentrations of primary ions are significantly decreased by 4–6 orders after desalination, accompanied by excellent performance for wastewater treatment. This evaporator realizes amof 1.21 kg m−2h−1, aηof 75.7%, and a voltage of 61 mV under one sun irradiation by assembling with a thermoelectric equipment. This study demonstrates that the blending of PM6 and Y6 achieves photothermal synergism, which improves the photothermal property and water evaporation rate, providing a valuable prospect for their application in water purification and thermoelectric power generation.