期刊
ACS NANO
卷 11, 期 6, 页码 5510-5518出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b00367
关键词
functionalized graphene; hydrophilic groups; solar steam generation; high efficiency evaporation; vapor-liquid interface
类别
资金
- Army Office of Research [W911NF-16-1-0267]
- Notre Dame Materials Characterization Facility and the Integrated Imaging Facility
- University of Notre Dame
- Center for Research Computing
- NSF
- TACC Stampede [TG-CTS100078]
- ND Energy postdoctoral fellowship
- National Natural Science Foundation of China [51421061]
- Programme of Introducing Talents of Discipline to Universities [B13040]
- Chinese Scholarship Council
The ability to efficiently utilize solar thermal energy to enable liquid-to-vapor phase transition has great technological implications for a wide variety of applications, such as water treatment and chemical fractionation. Here, we demonstrate that functionalizing graphene using hydrophilic groups can greatly enhance the solar thermal steam generation efficiency. Our results show that specially functionalized graphene can improve the overall solar-to-vapor efficiency from 38% to 48% at one sun conditions compared to chemically reduced graphene oxide. Our experiments show that such an improvement is a surface effect mainly attributed to the more hydrophilic feature of functionalized graphene, which influences the water meniscus profile at the vapor liquid interface due to capillary effect. This will lead to thinner water films close to the three-phase contact line, where the water surface temperature is higher since the resistance of thinner water film is smaller, leading to more efficient evaporation. This strategy of functionalizing graphene to make it more hydrophilic can be potentially integrated with the existing macroscopic heat isolation strategies to further improve the overall solar-to-vapor conversion efficiency.
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