通过交联及脱水控制,构筑了系列不同疏松度的氧化石墨烯/淀粉复合水凝胶(GO/AM)并利用火焰等离子体诱导燃烧、惰性气氛保护热分解等手段碳化合成了系列还原氧化石墨烯复合多孔碳材料(RGO-PC)。研究发现,GO不仅能够与AM在交联反应过程中实现均匀复合,而且在碳化过程中可诱导AM转化成多孔复合结构,并提高复合材料的导电性。同时,通过脱水控制可有效控制GO/AM-WG的疏松度,影响碳化后材料的结构特性。此外,通过火焰等离子体诱导碳化更利于材料形成多孔褶皱结构。结果表明,利用冷冻干燥和真空干燥获得的水凝胶碳化后的比电容分别是鼓风常压干燥的1.6倍和1.5倍;利用火焰等离子体诱导燃烧碳化后的比电容为惰性气氛保护热分解碳化的2.6倍左右。
In this paper,graphene oxide/starch composite hydrogels (GO/AM) with different porosity were prepared by crosslinking and dehydration control.A series of reduced graphene oxide composite porous carbon materials (RGO-PC) were synthesized by carbonization methods including flame plasma induced combustion and inert atmosphere protected thermal decomposition using GO/AM as precursor.It was found that GO could not only achieve uniform composite with AM during the crosslinking reaction process,but also induced AM to transform into a porous composite structure during the carbonization process,and improved the conductivity of the composite material.Meanwhile,dehydration control could effectively manage the porosity of GO/AM-WG and affect the structural characteristics of carbonized materials.Besides,flame plasma induced combustion was more conducive to the formation of porous fold structures in materials.The results showed that the specific capacitance of the carbonized hydrogel obtained by freeze-drying and vacuum drying was 1.6 times and 1.5 times that of the hydrogel obtained by blast drying at atmospheric pressure,respectively.The specific capacitance of the material obtained by flame plasma combustion carbonization was about 2.6 times that of inert atmosphere-protected thermal decomposition carbonization.
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基金资助
贵州省科技计划项目(黔科合基础-ZK[2021]一般057);贵州省普通高等学校青年科技人才成长项目(黔教合KY字[2021]252);贵州师范学院国家自然基金项目奖励补助资金项目(纵20210108)
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