Journal
CHEMICAL ENGINEERING JOURNAL
Volume 393, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124710
Keywords
A novel sol-gel strategy; Nitrogen and phosphorus co-doping; High energy density and excellent cyclic stability; Ultrahigh specific capacitance
Categories
Funding
- National Natural Science Foundation of China [21776147, 21606140, 61604086, 21905153]
- Qingdao Municipal Science and Technology Bureau, China [19-6-1-91-nsh]
- International Science & Technology Cooperation Program of China [2014DFA60150]
- Department of Science and Technology of Shandong Province [ZR2018BB066, 2016GGX104010]
- Department of Education of Shandong Province [J16LA14, J17KA013]
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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 m(2) g(-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(-1) and an excellent rate capability were obtained. Furthermore, the assembled symmetric supercapacitor based on NPMC delivers a high energy density of 20.2 Wh kg(-1) at a power density of 225 W kg(-1) and exhibited an excellent long-term electrochemical stability (95% capacitance retention after 5000 cycles), which evidently reached the practical requirement for supercapacitors.
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