Hu Jinhua, Yao Xin, Han Keyu, Ge Yumeng, Xu Shiqing, Bai Gongxun
College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China.
Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, China Jiliang University, Hangzhou, 310018, China.
Small. 2024 Dec;20(49):e2405742. doi: 10.1002/smll.202405742. Epub 2024 Sep 19.
Solar-powered water evaporation as a clean and abundant renewable energy-efficient desalination technology provides a promising strategy to solve the shortage of freshwater resources. However, the development and application of solar vapor technology are hindered by the relatively low near-infrared photothermal conversion efficiency of existing materials and the lack of effective improvement strategies. In this work, the conductivity characteristics of 2D semiconductors are capitalized on the high visible light absorption and ultra-low thermal. Specifically, rare-earth ion dopants into SnSe nanosheets, significantly boosting their near-infrared photothermal conversion efficiency and solar water evaporation performance are introduced. Remarkably, the photothermal conversion efficiency of the doped SnSe nanosheets surged from 51.56% to 82.11%, surpassing many previously reported photothermal materials. Furthermore, leveraging these nanosheets with enhanced photothermal conversion efficiency, a solar interfacial evaporation system is constructed. The evaporation rate of 2.17 kg m h and the efficiency of 96.5% can be achieved at one solar irradiance, and it also has good salt-resistance properties. The findings demonstrate the potential of rare earth ion-doped 2D semiconductor nanosheets in solar water evaporation, paving the way for future sustainable desalination solutions.
太阳能驱动水蒸发作为一种清洁且丰富的可再生能源高效海水淡化技术，为解决淡水资源短缺问题提供了一种很有前景的策略。然而，太阳能蒸汽技术的发展和应用受到现有材料相对较低的近红外光热转换效率以及缺乏有效改进策略的阻碍。在这项工作中，利用二维半导体的导电特性，借助其高可见光吸收和超低热特性。具体而言，将稀土离子掺杂到SnSe纳米片中，显著提高了它们的近红外光热转换效率，并介绍了太阳能水蒸发性能。值得注意的是，掺杂后的SnSe纳米片的光热转换效率从51.56%飙升至82.11%，超过了许多先前报道的光热材料。此外，利用这些具有增强光热转换效率的纳米片，构建了一个太阳能界面蒸发系统。在一个太阳辐照度下可实现2.17 kg m h的蒸发速率和96.5%的效率，并且它还具有良好的耐盐性能。这些发现证明了稀土离子掺杂二维半导体纳米片在太阳能水蒸发方面的潜力，为未来可持续的海水淡化解决方案铺平了道路。
