使用高浓度的氧化石墨烯溶液(GO)为碳源,纳米纤维素(NC)作为物理间隔物,组氨酸作为氮掺杂剂和间隔剂,通过一步水热法制备了纳米纤维素/组氨酸功能化石墨烯水凝胶(NCGHiss)复合材料。因其具有丰富的杂原子官能团(N,O)和良好的孔径结构,NCGHiss在对称型超级电容器中展现了优异的电化学性能。基于NCGHis10的超级电容器在0.3A/g电流密度下质量比电容达到232.39F/g,在10A/g时其比容量保持率高达76.36%。此外,组装的器件在10000次充放电循环后电容保持率高达100.35%。
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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基金资助
国家自然科学基金(52072191);黑龙江省自然科学基金联合引导项目(LH2020E126)
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