Heteroatoms-doped hierarchical porous carbon with multi-scale structure derived from petroleum asphalt for high-performance supercapacitors. (February 2022)

• Record Type: Journal Article
• Authors: Yang, Wang; Wang, Peng; Tu, Zhiqiang; Hou, Liqiang; Yan, Lu; Jiang, Bo; Zhang, Chengxiao; Huang, Guoyong; Yang, Fan; Li, Yongfeng
• Is Part Of: Carbon. Volume 187(2022)
• Page Start: 338
• Page End: 348
• Publication Date: 2022-02
• Subjects: Hierarchical porous carbon -- Pore engineering -- Heteroatom doping -- Petroleum asphalt -- Supercapacitors; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.11.008
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Rational pore structure and surface properties of carbon materials are significant for their practical application in supercapacitors (SCs). Pursuing a simple and costless synthesis approach is of great importance, yet full of challenges. Herein, heteroatoms-doped hierarchical porous carbon ( h -PC) with nanosheets/hollow nanospheres multi-scale structure is fabricated via a facile dual templates strategy with using petroleum asphalt as carbon precursor. The multi-scale pores are controlled by changing the ratio of target templates. Benefitting from high conductivity, plentiful ion-available surfaces, hierarchical porosity with suitable micro-mesoporous channels, and N, O, S heteroatoms, the resultant h -PC electrodes exhibit high specific capacitance of 437 F g −1 at 1 A g −1, and superior rate capability of 336 F g −1 at 50 A g −1 in three-electrode system with KOH electrolyte. The assembled symmetric SCs manifest the maximum energy density of 12.95 Wh kg −1 at 250 W kg −1 and robust cycling stability. Impressively, the energy density is further enhanced to 25.5 Wh kg −1 at 450 W kg −1 with using Na2 SO4 electrolyte. Even in all-solid-state symmetric SCs, it still demonstrates an encouraging property. This work may provide new insights for designing advanced carbon-based materials for capacitive energy storage. Graphical abstract: Heteroatoms-doped hierarchical porous carbon with nanosheets/hollow nanospheres multi-scale hybrid structure is synthesized via a facile and cost-effective strategy, and delivers superior capacitances for energy storage. Image 1 Highlights: Heteroatoms-doped hierarchical porous carbon with multi-scale structure is fabricated via a facile dual templates strategy. The multi-scale pores are controlled by changing the ratios of target templates. The assembled supercapacitors deliver excellent performances in both KOH and Na2 SO4 electrolytes. This work provides a new insight for designing advanced carbon-based materials for energy storage.