Preparation of hierarchical porous carbons from a coal tar pitch modified by fluid catalytic cracking oil for a high-performance supercapacitor
2021
Yin, Fan | Wei, Xian-Yong | Yan, Wei-Wei | Fan, Zi-Chun | Lu, Kun-Lang | Wei, Feng-Hua | Mao, Fa-Zhan | Zong, Zhi-Min
A template-free strategy was designed to prepare hierarchical porous carbons (HPCs) using fluid catalytic cracking oil modified a coal tar pitch (CTP). The resulting HPCs possess large specific surface areas, reasonable pore size distributions, and wrinkled structures, which could improve the overall electrochemical performance. They exhibit a specific capacitance value of 329 F g⁻¹ at 0.5 A g⁻¹ and still maintain 220 F g⁻¹ at 20 A g⁻¹, manifesting the remarkable rate capability. Additionally, the assembled symmetrical supercapacitor delivers a highest energy density of 23.6 Wh kg⁻¹ at a power density of 500 W kg⁻¹ and outstanding cycle stability of 92.8% capacitance retention after 10000 cycles. This work paves a new way to fabricate advanced carbon materials from low-cost CTP and provides a promising approach for value-added utilization of CTP.
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