A Novel Strategy for Fabricating Superior Cellulose-Based Solar Interfacial Evaporator with Multi-Layer Micro-/Nano-Architecture
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초록
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In this work, we report a cellulose-based solar evaporator with a hybrid multi-layer micro-/nano-architecture using an ice-templating and carbon-dioxide-laser process. The evaporator comprises a cellulose aerogel (CA) as an insulating layer and a laser-induced carbon (LC) as a light absorber/photothermal layer. The CA with aligned microchannels facilitated rapid water transport via capillary action, while the LC with high roughness featured high photothermal conversion. Notably, we coated the side area of the LC/CA evaporator with polydimethylsiloxane (PDMS) to increase its floatability in water. The LC/CA/PDMS solar evaporator exhibited excellent evaporation rate and efficiency of 1.92 kg m-2 h-1 and 93%, respectively, under 1 sun illumination. The excessive salt accumulation caused by prolonged desalianation was eliminated by the self-cleaning capability of the evaporator. Additionally, our solar evaporator demonstrated scalable fabrication potential as well as biodegradability.