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论文类型：期刊论文

发表时间：2020-04-15

发表刊物：CARBON

收录刊物：EI、SCIE

卷号：159

页面范围：495-503

ISSN号：0008-6223

摘要：Heteroatom-doped hierarchical porous carbons with large specific surface area and high heteroatom content are important but they generally require multistep syntheses and harsh conditions. Herein, a scalable and straightforward strategy is introduced to synthesize N/O co-doped hierarchical porous carbons (DNKs) derived from an all-in-one phthalonitrile precursor 1,3-bis(3,4-dicyanophenoxy)benzene (DPPH) with the assistant of potassium hydroxide and urea. In this facile and template-free method, all the raw materials are placed in the tube furnace, and the one-pot process involves polymerization, carbonization and activation. At 1 bar, ultra-high CO2 uptake of 7.27 mmol g(-1) at 273 K was achieved for the sample DNK@550, which can be attribute to its well-developed micropore structure and abundant nitrogen content (7.93 wt%). Moreover, the distinct features of DNK@650 afforded a high specific capacitance of 487 F g(-1) at a current density of 0.1 A g(-1) in a three-electrode system using 1 M H2SO4 aqueous as electrolyte. Most importantly, the fabricated symmetric supercapacitor exhibited excellent cycling stability over a new cycle record of 100000 (capacitor retention of ca. 103%). This work provides new insights for the fabrication of versatile porous carbons from readily available and flexible precursors via a facile and scalable route. (C) 2019 Elsevier Ltd. All rights reserved.