Journal
CARBON
Volume 170, Issue -, Pages 127-136Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.08.013
Keywords
Heterodoping; Carbon materials; Supercapacitors; Water splitting; High energy
Funding
- National Natural Science Foundation of China (NSFC) [21701101, 51973153]
- Shandong Scientific Research Awards Foundation for Outstanding Young Scientists [ZR2018JL010]
- Key Research and Development Plan of Shandong Province [2019GGX103032]
- Program for the Qingdao scientific and technological innovation high-level talents project-Aluminum-ion power and energy storage battery [17-2-1-1-zhc]
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Porous carbon materials (PCMs) have been extensively investigated as electrode materials for super-capacitors, yet are severely hindered by low capacitance and energy density. Herein, we reported the efficient synthesis of a ternary B, N, P-doped PCM (termed as BNP-C) via polymer dehalogenation strategy. The atomic contents of B, N, and P, as characterized by XPS, are 11.5, 1.1, and 0.8%, respectively, yet intriguingly resulting in limited water splitting activity due to the overwhelmingly presented B dopant. This specific feature can be taken advantage of for effectively expanding the workable voltage window while maintaining large capacitances of aqueous supercapacitors (ASCs). Besides, the BNP-C exhibited porous 3D structure, hierarchical porous structure, and large specific surface area of 1118.5 m(2) g(-1), which simultaneously ensured the BNP-C-assembled ASC with superior capacitive performance. As confirmed by both Dunn and Trasatti methods, pseudocapacitance remarkably contributed similar to 44.9 and similar to 40.2% respectively in overall capacitances for the BNP-C, which was mainly credited to the heavy decoration of B. In addition, the BNP-C symmetric ASC delivered very good long-term stability and high specific energy of 12.0 and 10.9 Wh kg(-1) in acidic and alkaline electrolytes, respectively. (C) 2020 Elsevier Ltd. All rights reserved.
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