Nitrogen-doped worm-like graphitized hierarchical porous carbon designed for enhancing area-normalized capacitance of electrical double layer supercapacitors

作者：Liu, Zheng; Xiao, Kuikui; Guo, Hui; Ning, Xiaohua; Hu, Aiping; Tang, Qunli; Fan, Binbin; Zhu, Yanfei; Chen, Xiaohua^*

来源：Carbon, 2017, 117: 163-173.

DOI：10.1016/j.carbon.2017.02.087

• SURFACE ENERGETICAL HETEROGENEITY
• REDUCED GRAPHENE OXIDE
• OXYGEN REDUCTION
• ELECTROCHEMICAL PERFORMANCE
• ENERGY
• SPECTROSCOPY
• CATALYSTS
• SULFUR
• FOAMS
• FABRICATION

Electrical double layer supercapacitors (EDLC) have an upper limit for their area-normalized capacitance (C-A) and lead to a bottleneck that impede the commercialization of high-energy-density supercapacitor devices. Quantum capacitance (C-Q) in series with electrical double layer capacitance (C-EDL) has been demonstrated to be a tremendous obstacle for enhancing the C-A of EDLC. Nitrogen doping can up-shift the Fermi-level and graphitization can improve the density of states (DOS), both of which can significantly mitigate the limiting influence of C-Q. Here, a facile approach is developed for synthesizing an ideal carbon-based EDLC electrode material by simply adding ferrous sulfate heptahydrate (FSH) into the polymer when colloid aggregation. The morphology, porous structure, graphitization degree, doped N content and the types of the doped N of the samples can be easily tuned through changing the FSH ratio. The optimized nitrogen doped worm-like hierarchical porous carbon with graphitized porous carbon embossment (NWHC-GE) exhibits an exceptionally high C-A (24.6 mu F cm(-2) at 1 A g(-1) and 18.5 mu F cm(-2) at 100 A g(-1)). This demonstrates a way to enhance the C-A and provides a potential strategy for breaking through the limiting specific capacitance of carbon-based materials.

• 出版日期2017-6
• 单位中南大学; 湖南大学