Application of nanocellulose/histidine-functionalized graphene composites in supercapacitors
Nanocellulose/histidine functionalized graphene hydrogels(NCGHiss)composites were successfully prepared by one-step hydrothermal method using a high concentration of graphene oxide solution(GO)as carbon source,nanocellulose(NC)as a physical spacer and histidine as a nitrogen dopant and spacer.NCGHiss exhibited excellent electrochemical performance in symmetric supercapacitors due to its abundant heteroatom functional groups(N,O)and good pore structure.The NCGHis10-based supercapacitor had a gravimetric specific capacitance of 232.39F/g at a current density of 0.3A/g,and its specific capacity retention rate was as high as 76.36％at 10A/g.In addition,the assembled device had a capacitance retention rate of 100.35％after 10000 charge-discharge cycles.
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