A novel sol-gel strategy for N, P dual-doped mesoporous carbon with high specific capacitance and energy density for advanced supercapacitors
A novel sol-gel strategy for N, P dual-doped mesoporous carbon with high specific capacitance and energy density for advanced supercapacitors
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DOI：
10.1016/j.cej.2020.124710
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发表时间：
2020-08
影响因子：
15.1
通讯作者：
Xipeng Xin;Hongquan Kang;Jianguang Feng;Lina Sui;Hongzhou Dong;P. Zhao;Beili Pang;Yingjie Chen
中科院分区：
文献类型：
--
作者：
Xipeng Xin;Hongquan Kang;Jianguang Feng;Lina Sui;Hongzhou Dong;P. Zhao;Beili Pang;Yingjie Chen
在这项工作中，开发了一种简单的溶胶-凝胶策略来合成N/P共掺杂有序介孔碳（NPMCs）。通过加速乙醇的挥发，强大的驱动力促进了碳前驱体、表面活性剂和掺杂剂在水和乙醇界面上的自组装过程。所制备的NPMC具有层叠片状表面形貌和有序的二维六边形介观结构，孔径均匀（4.3 nm），比表面积高（938 m2 - 1）。n掺杂改善表面润湿性和p掺杂丰富活性位点的协同作用使NPMC具有优异的电化学性能。计算分析证实，N、P共掺杂可以增强碳材料的活性位点，扩大碳材料的电位差，从而提高碳材料的电容。获得了392 F g−1的超高电容和优异的倍率性能。此外，基于NPMC的组装对称超级电容器在225 W kg - 1的功率密度下可提供20.2 Wh kg - 1的高能量密度，并表现出优异的长期电化学稳定性（循环5000次后电容保持率为95%），明显达到了超级电容器的实际要求。
In this work, a facile sol-gel strategy was developed to synthesize N/P co-doped ordered mesoporous carbons (NPMCs). By accelerating the volatilization of ethanol, a strong driving force promoted the self-assembly process among carbon precursor, surfactant and dopant at the interface of water and ethanol. The obtained NPMC showed stacked flake-like surface morphology and ordered 2D-hexagonal mesostructures with uniform pore size (4.3 nm) and high specific surface areas (938 m2g−1). Synergistic effects of improved surface wettability by N-doping and rich active sites by P-doping rendered the NPMC with excellent electrochemical performance. Computational analyses confirmed that N, P co-doping could enhance active sites and widen potential difference of carbon materials to improve their capacitance. An ultrahigh capacitance of 392 F g−1and an excellent rate capability were obtained. Furthermore, the assembled symmetric supercapacitor based on NPMC delivers a high energy density of 20.2 Wh kg−1at a power density of 225 W kg−1and exhibited an excellent long-term electrochemical stability (95% capacitance retention after 5000 cycles), which evidently reached the practical requirement for supercapacitors.