石墨烯/纳米纤维素复合导电纸的制备及电容性能研究

Preparation and Capacitive Performance of Graphene/Nanocellulose Composite Conductive Paper

关键词:  石墨烯  纳米纤维素  柔性电极  超级电容器

Key Words:graphene  nanocellulose  flexible electrode  supercapacitor

摘要:本研究选用球形碳（GS）作为插层剂，还原氧化石墨烯（rGO）作为导电基质，纤维素纳米纤丝（CNF）作为绿色柔性基底，制备了具有三明治结构的石墨烯/纳米纤维素复合导电纸（rGO/GS/CNF），并探讨了GS和CNF的加入对rGO/GS/CNF的影响。结果表明，与纯石墨烯导电纸相比，CNF和GS的存在改变了复合纸的微观结构，使rGO/GS/CNF具有更好的力学强度（53.7 MPa）；GS的嵌入增加了rGO的片层距离，有效改善了rGO/GS/CNF的倍率性能和电容性能。在0.5 mA/cm²的电流密度下，rGO/GS/CNF电极的面积比电容为227.8 mF/cm²，经过1 000次充放电循环测试后，电容保留率为82.1%，且具有较大的能量密度（62.0 μWh/cm²）和功率密度（2 080 μW/cm²），在柔性超级电容器领域具有良好的应用潜力。

Abstract:In this study， taking carbon sphere （GS） as the intercalating agent， reduced graphene oxide （rGO） as conductive matrix， and cellulose nanofibril （CNF） as green and flexible substrate， the graphene/cellulose nanofiber composite conductive paper （rGO/GS/CNF） with sandwich structure was prepared and the effects of adding GS and CNF on rGO/GS/CNF were explored. The results showed that compared with pure graphene conductive paper， the presence of CNF and GS could change the microstructure of the composite paper， giving rGO/GS/CNF better mechanical strength （53.7 MPa）， and the embedding of GS could also increase the interlayer distance of rGO， effectively improving the multiplicity and capacitive performance of rGO/GS/CNF. At the current density of 0.5 mA/cm²， the area specific capacitance of the rGO/GS/CNF electrode was 227.8 mF/cm²， and the capacitance retention rate was 82.1% after 1 000 charge-discharge cycles， with exhibiting large energy density （62.0 μWh/cm²）， and power density （2 080 μW/cm²）， which indicated good application potential in the field of flexible supercapacitors.