Water evaporation properties of multi-walled carbon nanotubes/reduced graphite oxide aerogel
Through π-π interaction,graphene sheets form a kind of stacking structure,which is not conducive to water transport and affects the water evaporation performance of graphene-based materials.To improve the stacking structure between graphene sheets for forming more water transport channels and enhancing the water evaporation performance of graphene-based materials,multi-walled carbon nanotubes(MWCNT)with different contents were compounded in graphene oxide(GO),and the composite hydrogel was prepared by a hydrothermal reduction method.Eventually,the reduced graphene oxide composite multi-walled carbon nanotube aerogel(MWCNT/rGOA)was obtained by a freeze-drying method.In this paper,the effects of MWCNT content on the microstructure and water evaporation performance of reduced graphene oxide aerogels were investigated,and the structure and properties of MWCNT/rGOA were characterized.The results show that when the MWCNT content is low(the mass ratio of MWCNT to GO is 0-0.4),the water channels inside the aerogel are more abundant,and the water evaporation performance is enhanced with the increase of MWCNT content.As the MWCNT content continues to increase(the mass ratio of MWCNT to GO is 0.4-0.7),MWCNT agglomerates in large quantities,destroying the water channels inside the aerogel,and weakening the water evaporation performance.When the mass ratio of MWCNT to GO is 0.4,the water evaporation rate and photothermal conversion efficiency of MWCNT/rGOA reach maximum values,which are 1.75 kg/(m2·h)and 91.1%,respectively.
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