摘要
石墨烯片层间由于π-π相互作用会形成堆叠结构,不利于水体传输,影响石墨烯基材料的水蒸发性能。为改善石墨烯片层间的堆叠结构,形成较多的水体传输通道,提高石墨烯基材料的水蒸发性能,在氧化石墨烯(GO)中复合不同含量的多壁碳纳米管(MWCNT),采用水热还原法得到复合水凝胶,最后利用冷冻干燥法得到多壁碳纳米管复合还原氧化石墨烯气凝胶(MWCNT/rGOA)。研究了MWCNT含量对还原氧化石墨烯气凝胶微观结构与水蒸发性能的影响,并对MWCNT/rGOA的结构和性能进行了表征。结果表明,当MWCNT含量较低(MWCNT与GO质量比为0~0.4)时,随着MWCNT含量的增加,石墨烯片层间距增大,气凝胶内部水通道更加丰富,水蒸发性能增强。随着MWCNT含量的继续增加(MWCNT与GO质量比为0.4~0.7),MWCNT大量团聚,破坏了气凝胶内部的水通道,水蒸发性能减弱。当MWCNT与GO质量比为0.4时,MWCNT/rGOA的水蒸发速率和光热转化效率均达到最大值,分别为1.75 kg/(m^(2)·h)和91.1%。
Throughπ-πinteraction,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/(m^(2)·h)and 91.1%,respectively.
作者
薛开诚
郭立
刘银波
付萍
XUE Kaicheng;GUO Li;LIU Yinbo;FU Ping(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)
出处
《武汉工程大学学报》
CAS
2024年第3期267-273,共7页
Journal of Wuhan Institute of Technology
基金
武汉工程大学第十四届研究生教育创新基金(CX2022258)。
关键词
还原氧化石墨烯
多壁碳纳米管
气凝胶
蒸发性能
reduced grapheneoxide
multi-walled carbon nanotubes
aerogel
evaporation properties
