期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 7, 页码 7024-7034出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b06774
关键词
Seif-templating; Self-doping; Porous carbon spheres; High N/O contents; Supercapacitor
资金
- National Natural Science Foundation of China [21875165, 51772216, 21501135]
- Science and Technology Commission of Shanghai Municipality, China [14DZ2261100]
- Fundamental Research Funds for the Central Universities
- Large Equipment Test Foundation of Tongji University
A template-free and self-doping approach is developed for fabricating N,O-enriched porous carbon spheres (PCSs) via direct carbonization/activation of melamine-glyoxal polymer. The interconnected spherical morphology of PCSs generates stacking porosities as ion reservoirs for rapid ion diffusion and affords conductive networks to shorten the transport lengths for electron transfer. Besides, PCSs exhibit a large surface area (1302 m(2) g(-1)), ample ultramicropores (0.54 nm), and developed supermicro- and mesopores. This unique pore architecture provides optimized ion-accessible pore size to enhance double layer capacitance, and serves as ion-highways for rapid diffusion of electrolyte ions. Furthermore, high N/O elements (7.97/10.16 wt %) incorporated into PCSs improve surface wettability and supply additional pseudocapacitance. Therefore, the resultant PCS electrodes exhibit superior electrochemical performances, such as a high specific capacitance up to 344 F g(-1) at 1.0 A g(-1), remarkable rate capability, and long-term stability in a three-electrode. Notably, the PCS-based supercapacitor exhibits an impressive energy density of 33.37 Wh kg(-1) and power density of 9000 W kg(-1) in Na2SO4 electrolyte. This result provides a simple and efficient fabrication of PCSs for high-performance supercapacitors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据