纳米纤维素/还原氧化石墨烯复合材料用于高性能超级电容器

以高浓度氧化石墨烯(GO)溶液作为反应前驱体，纳米纤维素(NC)作为物理间隔物和电解液储存器，通过简单的一步水热法制备了纳米纤维素/还原氧化石墨烯(NC/rGO)复合材料，并探究了其作为超级电容器电极材料的潜力。结果如下：NC添加量为1 mL所制备的NC/rGO-1具有最佳电化学性能。基于NC/rGO-1的无黏合剂对称型超级电容器在0.3 A·g^-1的电流密度下显示出了269.33 F·g^-1和350.13 F·cm^-3的高质量和体积比电容，并在10.0 A·g^-1时仍能达到215.88 F·g^-1和280.62 F·cm^-3(其初始值的80.15%)。组装器件还显示出了较高的质量和体积能量密度(9.3 Wh·kg^-1和12.13 Wh·L^-1)和出色的循环性能(10 A·g^-1下10 000次循环后其初始比电容仅减少6.02%)。

Nanocellulose/reduced graphene oxide composites for high performance supercapacitors

Nanocellulose/reduced graphene oxide (NC/rGO) composites were prepared by a simple one-step hydro-thermal method using high-concentration graphene oxide (GO) solution as the reaction precursor and nanocellulose (NC) as the physical spacer and electrolyte reservoirs. Subsequently, we explored the potential of NC/rGO as elec-trode materials for supercapacitors. Due to its dense porous structure and large oxygen-containing functional group content, NC/rGO-1 prepared with 1 mL NC exhibited the best electrochemical performance. The binder-free sym-metric supercapacitor based on NC/rGO-1 showed high gravimetric and volumetric specific capacitance of 269.33 F·g^-1 and 350.13 F·cm^-3 at a current density of 0.3 A·g^-1. These values can still reach 215.88 F·g^-1 and 280.62 F· cm^-3 at 10.0 A·g^-1 (80.15% of its initial value). The assembled device also displayed high gravimetric and volumet-ric energy densities (9.3 Wh·kg^-1 and 12.13 Wh·L^-1) and excellent cycling performance (the initial specific capacitance decreased by only 6.02% after 10 000 cycles at 10 A·g^-1).