<p>Coal tar pitch (CTP) is widely used in road laying. However, how to realize its high added value is still a difficult problem to be solved. Herein, we report the simple avenue for the synthesis of N doped porous carbon (NPC<sub>Mg</sub>) by template method derived from aromatic hydrocarbons in CTP. The NPC<sub>Mg</sub> presents big surface area of 2523.2 m<sup>2</sup>&#xa0;g<sup>−1</sup> and hierarchical pore structures, temperate N content of 1.88 at.%. Due to the structural merits, NPC<sub>Mg</sub> electrode obtains large capacitance of 483.1 F g<sup>−1</sup> at 0.1 A g<sup>−1</sup> and superb cycle stability with 4.6% decay after 25,000 cycles in 6&#xa0;M KOH solution. Besides, NPC<sub>Mg</sub>-based supercapacitor with neutral electrolyte also achieves high capacitance of 339 F g<sup>−1</sup>, large energy output of 33.3 Wh kg<sup>−1</sup>, long cycle life without decay after 15,000 cycles. Interestingly, the NPC<sub>Mg</sub>-based zinc ion hybrid capacitor presents large capacity of 287.7 F g<sup>−1</sup> and superb energy output of 114 Wh kg<sup>−1</sup>. This work provides a common approach to synthesize heteroatom doped carbon materials for capacitors.</p>

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N doped porous carbon derived from coal tar pitch for supercapacitor and zinc ion hybrid capacitor

  • Jun Qiao,
  • Jiawei Zhang,
  • Weiyao Geng,
  • Shichao Wang,
  • Feng Wei

摘要

Coal tar pitch (CTP) is widely used in road laying. However, how to realize its high added value is still a difficult problem to be solved. Herein, we report the simple avenue for the synthesis of N doped porous carbon (NPCMg) by template method derived from aromatic hydrocarbons in CTP. The NPCMg presents big surface area of 2523.2 m2 g−1 and hierarchical pore structures, temperate N content of 1.88 at.%. Due to the structural merits, NPCMg electrode obtains large capacitance of 483.1 F g−1 at 0.1 A g−1 and superb cycle stability with 4.6% decay after 25,000 cycles in 6 M KOH solution. Besides, NPCMg-based supercapacitor with neutral electrolyte also achieves high capacitance of 339 F g−1, large energy output of 33.3 Wh kg−1, long cycle life without decay after 15,000 cycles. Interestingly, the NPCMg-based zinc ion hybrid capacitor presents large capacity of 287.7 F g−1 and superb energy output of 114 Wh kg−1. This work provides a common approach to synthesize heteroatom doped carbon materials for capacitors.