Janus Nano-Micro Structure-Enabled Coupling of Photothermal Conversion, Heat Localization and Water Supply for High-Efficiency Solar-Driven Interfacial Evaporation

被引：63

作者：

Chen, Zhongyi ^{[1
]}

Wang, Jing ^{[2
]}

Zhou, Haijun ^{[1
]}

Xie, Zongming ^{[1
]}

Shao, Lei ^{[2
]}

Chen, Aizheng ^{[1
,3
]}

Wang, Shi-Bin ^{[3
]}

Jiang, Nina ^{[1
,3
]}

机构：

[1] Huaqiao Univ, Coll Chem Engn, Xiamen 361021, Peoples R China

[2] Sun Yat Sen Univ, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Guangdong Prov Key Lab Display Mat & Technol, Guangzhou 510275, Peoples R China

[3] Huaqiao Univ, Fujian Prov Key Lab Biochem Technol, Xiamen 361021, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2023年 / 33卷 / 41期

基金：

中国国家自然科学基金;

关键词：

Janus nano-micro structures; noble metal nanocrystals; plasmonic photothermal conversion; solar evaporation; desalination; STEAM-GENERATION; NANOSTRUCTURES; ABSORPTION; MEMBRANE;

D O I：

10.1002/adfm.202303656

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Photothermal conversion, heat localization and water supply are the keys to achieving efficient solar-driven interfacial evaporation. However, effective coupling between the three aspects at the air/liquid interface remains challenging. Herein, Au@Ag-Pd trimetallic nanostructure/polystyrene (PS) microsphere Janus structures are designed as the solar absorber and thermal insulator. The Janus structures deposited on a water supply layer act as a 2D interfacial solar evaporator. The PS microsphere localizes heat at micrometer scale and enhances plasmonic absorption of the Au@Ag-Pd nanocrystals supported on the microsphere. Meanwhile, the Janus structures divide the surface of water supply layer into multiple regions with sub-micrometer depths, lowering the evaporation enthalpy. Owing to the synergic effects of these components, the evaporator realizes a solar-to-vapor conversion efficiency of 99.1% and an evaporation rate of 3.04 kg m(-2) h(-1) in pure water under 1 sun illumination. The efficient solar-driven evaporation can last for over 40 h. Furthermore, the solar evaporator shows high-performance seawater desalination with salt removal ratios of near 100%. This study brings new insights for controlling evaporation thermodynamics and kinetics. The Janus nano-micro structure design can be extended to other systems for various solar-thermal applications.

引用

页数：13