气凝胶
超级电容器
材料科学
兴奋剂
固态
化学工程
复合数
钠
三聚氰胺
碳纤维
纳米技术
电极
复合材料
电化学
化学
冶金
光电子学
工程类
物理化学
作者
Jinqiang Sun,Jing Zhang,Mengge Shang,Minna Zhang,Xinfu Zhao,Sijia Liu,Xiaochan Liu,Shuo Liu,Xibin Yi
标识
DOI:10.1016/j.apsusc.2022.155109
摘要
• SAM aerogel is prepared by directional freeze-drying method. • Tuning carbonization temperature and activator ratio to optimize performance. • SAM-700-4 shows 3D interconnected structure with large specific surface area. • SAM-700-4 shows excellent specific capacitance of 441.80 F/g at 0.5 A/g. • SAM-700-4//SAM-700-4 all-solid-state supercapacitor exhibit high energy density. Hierarchical porous carbon shows great potential in the field of energy storage due to high porosity, large surface area, and excellent electrical conductivity. Here, we successfully fabricated carbon aerogel derived from sodium alginate/melamine composite (SAM) by directional freeze-drying combined with simple carbonization and activation process. The optimal SAM-700-4 possesses a high nitrogen (5.67 at.%) and oxygen (8.98 at.%) contents along with high specific surface area of 2577.62 m 2 /g and unique directional channel structure. Due to their synergistic effect, the SAM-700-4 electrode exhibits a high specific capacitance of 441.80 F/g at a current density of 0.5 A/g. Interestingly, the all-solid-state symmetric supercapacitor based on SAM-700-4//SAM-700-4 in PVA/SA/KOH gel electrolyte has a large energy density of 20.87 Wh/kg at a power density of 4000 W/kg and exhibits excellent cycling stability. It is believed that this N, O co-doped directional hierarchical porous carbon aerogels may show promising prospects as advanced energy storage materials.
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