Nitrogen-enriched (N-enriched) carbon nanofiber aerogels (NCNAs) with an ultrafine nanofiber network structure were designed and prepared by using chitin nanofiber aerogels as the precursor. Because of the uniform nanofibrous architecture and nitrogen-rich composition of chitin nanofiber aerogels, the NCNAs exhibited large specific surface area (490–1597 m² g^–1) and a high nitrogen content (2.07–7.65%). As a consequence, supercapacitor electrodes prepared from NCNA-900 showed specific capacitances as high as 221 F g^–1 at the current density of 1.0 A g^–1 and good capacitance retention of 92% over 8000 cycles in a 6.0 mol L^–1 KOH electrolyte without further activation. Moreover, the NCNA-900 could also be applied as an effective adsorbent for dye adsorption, such as Congo red (496 mg g^–1) and Rhodanine B (489 mg g^–1). In view of an excellent electrochemical performance and high adsorption capacities for dyes as well as cost-effective and eco-friendly approaches, NCNAs derived from marine chitin show great potential for application in energy storage and environmental remediation.

中文翻译：

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源自海洋甲壳质的富氮碳纳米纤维气凝胶，用于能量存储和环境修复

以几丁质纳米纤维气凝胶为前驱体，设计并制备了具有超细纳米纤维网络结构的富氮（N富集）碳纳米纤维气凝胶。由于几丁质纳米纤维气凝胶具有均匀的纳米纤维结构和富氮成分，因此NCNA的比表面积大（490-1597 m ² g ^-1），氮含量高（2.07-7.65％）。结果，由NCNA-900制备的超级电容器电极在1.0 A g ^–1的电流密度下显示出高达221 F g ^–1的比电容，在6.0 mol L ^–1的8000个循环中具有92％的良好电容保持率。KOH电解质无需进一步活化。此外，NCNA-900还可以用作染料吸附的有效吸附剂，例如刚果红（496 mg g ^–1）和罗丹宁B（489 mg g ^–1）。鉴于出色的电化学性能和对染料的高吸附能力以及具有成本效益和生态友好的方法，衍生自海洋甲壳质的NCNA在能源存储和环境修复方面显示出巨大的潜力。