Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 614, Issue -, Pages 298-309Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.01.093
Keywords
Coal tar pitch; Air pre-oxidation; Hierarchical porous carbon; Supercapacitor
Categories
Funding
- Major Research and Development Project of Central Government Guides Local Science and Technology Development Professional Technology Innovation Platform [2019ZY-CXPT-08]
- National Key Research and Development Program of China [2019YFC1905803]
- Project of Science & Technology Office of Shaanxi Province [2018TSCXLNY-02-01]
- Natural Science Basic Research Plan in Shaanxi Province of China [2021JQ-628]
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Carbon materials with rational pore structure have been designed and constructed via a simple and low-cost route, exhibiting excellent electrochemical performances for supercapacitor applications.
Carbon materials with rational pore structure have attracted tremendous attention in high-performance supercapacitor applications. However, designing and constructing such carbon materials with excellent performances via a simple and low-cost route is still a challenge. Herein, the nitrogen self-doped oxygen-rich hierarchical porous carbons (OTSx-PC) derived from coal tar pitch are constructed via a facile strategy of air pre-oxidation-activation. The air pre-oxidation treatment can effectively regulate the small-sized mesopore structure (2-4 nm) of samples. The optimal OTS350-PC sample exhibits a high specific capacitance of 298 F g(-1) at 0.5 A g(-1), and delivers a high energy density of 14.9 Wh kg(-1) at a power density of 0.15 kW kg(-1) with remarkable cycling stability in KOH aqueous electrolyte. This excel-lent electrochemical performance is attributed to its ultrahigh specific surface area (SSA, 2941 m(2) g(-1)), huge total pore volume (V-t, 1.9 cm(3) g(-1)), rational pore structure and reasonable heteroatom configuration, which ensure sufficient charge storage, rapid electrolyte ions diffusion, as well as the contributed pseudocapacitance. This research not only offers a facile route for high-value utilization of coal tar pitch but also provides the cost-effective and excellent porous carbons for supercapacitor with high performance. (C) 2022 Elsevier Inc. All rights reserved.
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