Han Dong-Dong, Chen Zhao-Di, Li Ji-Chao, Mao Jiang-Wei, Jiao Zhi-Zhen, Wang Wei, Zhang Wei, Zhang Yong-Lai, Sun Hong-Bo
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
Key Laboratory of Automobile Materials Ministry of Education, College of Materials Science & Engineering, and Electron Microscopy Center, Jilin University, Changchun 130012, China.
ACS Appl Mater Interfaces. 2020 Jun 3;12(22):25435-25443. doi: 10.1021/acsami.0c05401. Epub 2020 May 22.
Solar interfacial evaporation has been recognized as a versatile energy conversion protocol for cutting-edge applications such as water treatment and power generation (e.g., hydro voltaic effect). Recently, to enhance water evaporation rates, water temperature and evaporation area have been considered as essential ingredients, and thus photothermal materials and three-dimensional hierarchical structures have been developed to promote light-to-heat conversion efficiency and enhance interfacial evaporation. However, less attention has been paid to the airflow effect, because the interfacial floatability of photothermal membranes should be considered under air blast. Here, inspired from the stable interfacial floatability of lotus leaves, we report the airflow enhanced solar interfacial evaporation approach using a graphene-based Janus membrane. Laser-induced graphene (LIG) film was treated unilaterally by O plasma, forming a LIG/oxidized LIG (LIG-O) Janus membrane with distinct wettability on two sides. Higher water evaporation rate of 1.512 kg m h is achieved. The high solar interfacial evaporation performance can be attributed to the two advantages: (i) the combination of microscale capillary water transporting and nanoscale light trapping; (ii) hydrophobic/hydrophilic Janus membrane for stable interfacial floatability under airflow. Our approach is feasible for developing high-performance solar interfacial evaporation devices for practical clean energy utilization.
太阳能界面蒸发已被公认为是一种适用于水处理和发电（如光伏效应）等前沿应用的通用能量转换方案。最近，为了提高水的蒸发速率，水温及蒸发面积被视为关键因素，因此人们开发了光热材料和三维分级结构，以提高光热转换效率并增强界面蒸发。然而，气流效应较少受到关注，因为在鼓风条件下需要考虑光热膜的界面漂浮性。在此，受荷叶稳定的界面漂浮性启发，我们报道了一种利用基于石墨烯的双面膜实现气流增强的太阳能界面蒸发方法。激光诱导石墨烯（LIG）薄膜经氧等离子体单侧处理，形成了一种在两侧具有不同润湿性的LIG/氧化LIG（LIG-O）双面膜。实现了1.512 kg m⁻² h⁻¹的较高水蒸发速率。这种高太阳能界面蒸发性能可归因于两个优点：（i）微观尺度的毛细管水传输与纳米尺度的光捕获相结合；（ii）疏水/亲水双面膜在气流下具有稳定的界面漂浮性。我们的方法对于开发用于实际清洁能源利用 的高性能太阳能界面蒸发装置是可行的。
