Plasmon Based Double‐Layer Hydrogel Device for a Highly Efficient Solar Vapor Generation

• Published in: Advanced functional materials 2019-07, Vol.29 (29), p.n/a
• Main Authors: Sun, Zeyu, Wang, Jiajun, Wu, Qinglei, Wang, Zongyuan, Wang, Zhao, Sun, Jie, Liu, Chang‐Jun
• Format: Article
• Language: English
• Subjects: agarose hydrogel; Energy harvesting; Evaporation; Evaporation rate; Fresh water; Hydrogels; Light; Materials science; Nanoparticles; room temperature electron reduction; Saline water; Sewage; sewage purification; Silver; silver nanoparticles; Solar energy; Solar heating; solar vapor generation; Thermodynamic efficiency; Vapors; Water purification; Water transfer
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201901312

Solar vapor generation is a facile and an efficient way for solar energy harvesting, which is applied to address the issue of fresh water extraction from sewage or brine. Several solar vapor generation devices have been developed in the past few years, but the low evaporation rate still remains as a challenge. In this work, a novel double‐layer solar vapor generation device, named as Ag‐PSS‐AG/AG device, is reported. This device is based on the hierarchical composition of silver nanoparticles (Ag NPs) and poly (sodium‐p‐styrenesulfonate) (PSS) decorated agarose gel (AG). The device reveals a synergetic effect of the two layers with high light‐harvesting and water‐transfer performance, respectively, leading to an ultrahigh vapor generation rate of 2.10 kg m−2 h−1 with a solar thermal efficiency of 92.8% under 1 sun illumination. This high evaporation rate is mainly owing to the powerful light‐thermal conversion of Ag NPs as well as the outstanding water transfer capability of agarose hydrogel. Consequently, this device can be directly used for the purification of sewage and muddy water. It is also promising for applications in separation, humidity management, and others. A novel double‐layer solar vapor generation device based on the hierarchical composition of silver nanoparticles and agarose gel is designed. With the synergetic effect of the two functional layers, the device exhibits an ultrahigh vapor generation rate of 2.10 kg m−2 h−1 with a solar thermal efficiency of 92.8% under 1 Sun illumination.