Song Peng, Li Congcong, Zhao Ningmiao, Ji Zhenyuan, Zhai Linzhi, Shen Xiaoping, Liu Qi
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
J Colloid Interface Sci. 2023 Mar;633:362-373. doi: 10.1016/j.jcis.2022.11.117. Epub 2022 Nov 26.
Carbon nanosheets with heteroatom doping and well-developed porosity exhibit broad application foreground for Zn-ion hybrid supercapacitors (ZHSCs), but the simple and controllable preparation is still of great challenge. In this study, by using LiCl-KCl as in-built templates, histidine as carbon and nitrogen sources, and KNO, KSO, KOH or NaSO as active agent, a series of N and NS doped porous carbon nanosheets are developed. Results indicate that, with the activator introduction, pore structures of the carbonized products are notably boosted, showing an astounding 30-244 % increase in BET specific surface area, and meanwhile, heteroatom with a content of ca. 12 % can be doped into the resultant carbon skeletons. Specifically, the NSPCN-800 (activated by NaSO) with a large specific surface area of 1297 m/g, a hierarchically porous structure composed of abundant micropores and mesopores, and a suitable heteroatom content (N: 11.9 wt%; S: 0.6 wt%) presents an impressive energy storage behavior as cathode for ZHSCs, including a specific capacitance of 165.8F/g, a specific capacity of 95.2 mAh/g, an energy density of 59.0 Wh kg and a cyclic stability with a 82.6 % capacity retention after 5000 cycles. These performance parameters surpass numerous reported ZHSCs, making NSPCN-800 a very promising cathode for practical use.
具有杂原子掺杂和发达孔隙率的碳纳米片在锌离子混合超级电容器（ZHSCs）中展现出广阔的应用前景，但简单可控的制备方法仍极具挑战性。在本研究中，以LiCl-KCl作为内置模板，组氨酸作为碳源和氮源，并使用KNO₃、K₂SO₄、KOH或Na₂SO₄作为活性剂，制备了一系列氮和氮硫共掺杂的多孔碳纳米片。结果表明，随着活性剂的引入，碳化产物的孔结构显著改善，BET比表面积惊人地增加了30-244%，同时，约12%的杂原子可以掺杂到所得的碳骨架中。具体而言，NSPCN-800（由Na₂SO₄活化）具有1297 m²/g的大比表面积、由丰富的微孔和介孔组成的分级多孔结构以及合适的杂原子含量（N：11.9 wt%；S：0.6 wt%），作为ZHSCs的阴极表现出令人印象深刻的储能性能，包括165.8 F/g的比电容、95.2 mAh/g的比容量、59.0 Wh/kg的能量密度以及在5000次循环后82.6%的容量保持率的循环稳定性。这些性能参数超过了许多已报道的ZHSCs，使NSPCN-800成为极具实际应用前景的阴极材料。
