Template-free synthesis of nitrogen-doped hierarchical porous carbons for CO₂ adsorption and supercapacitor electrodes

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• 作者：Xuefeng Bing^a ; Yanju Wei^a ; Mei Wang^a ; Sheng Xu^a ; Donghui Long^a ; Jitong Wang^a ; ^b ; ^{wangjt@ecust.edu.cn} ; Wenming Qiao^a ; ^b ; Licheng Ling^a ; ^b
• 关键词：Template-free synthesis ; Nitrogen-doped hierarchical porous carbons ; CO2 adsorption ; Supercapacitor
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：488
• 期：Complete
• 页码：207-217
• 全文大小：3785 K
• 卷排序：488

文摘

Nitrogen-doped hierarchical porous carbons (NHPCs) with controllable nitrogen content were prepared via a template-free method by direct carbonization of melamine-resorcinol-terephthaldehyde networks. The synthetic approach is facile and gentle, resulting in a hierarchical pore structure with modest micropores and well-developed meso-/macropores, and allowing the easy adjusting of the nitrogen content in the carbon framework. The micropore structure was generated within the highly cross-linked networks of polymer chains, while the mesopore and macropore structure were formed from the interconnected 3D gel network. The as-prepared NHPC has a large specific surface area of 1150 m2·g−1, and a high nitrogen content of 14.5 wt.%. CO2 adsorption performances were measured between 0 °C and 75 °C, and a high adsorption capacity of 3.96 mmol·g−1 was achieved at 1 bar and 0 °C. Moreover, these nitrogen-doped hierarchical porous carbons exhibit a great potential to act as electrode materials for supercapacitors, which could deliver high specific capacitance of 214.0 F·g−1 with an excellent rate capability of 74.7% from 0.1 to 10 A·g−1. The appropriate nitrogen doping and well-developed hierarchical porosity could accelerate the ion diffusion and the frequency response for excellent capacitive performance. This kind of new nitrogen-doped hierarchical porous carbons with controllable hierarchical porosity and chemical composition may have a good potential in the future applications.